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`
`USOO51 36397A
`
`United States Patent
`
`1191
`
`Patent Number:
`
`[11]
`5,136,397
`
`
` Miyashita [45] Date of Patent: Aug. 4, 1992
`
`
`
`1
`
`............. .. 315/Z25 X
`8/1988 Nuckolls et al.
`352/140
`3/1990 Kuriyama ..... ..
`.-.3-é-é./.1:131/5):
`gsiwa et a1-
`..
`.
`0
`........... ..
`y
`:
`...... 358/194.1
`8/1990 Lindahl ...........
`4,951,131
`..... .. 353/85
`4,964,719 10/1990 Tachikawa el. al.
`4,988,187
`1 1991 K ‘
`...........................
`/
`unyama
`353/101
`FOREIGN PATENT DOCUMENTS
`
`
`
`4,763,044
`4,907,873
`
`.
`
`.
`.
`
`8/1986 European Fat. 011”.
`0192023
`0239024 9/1987 European Pat. Off.
`61-154377
`7/1986 Japan .
`W089/06417 7/1989 PCT Int’l Appl.
`Pri
`E
`._
`J
`J G d
`mary xammer— ames
`.
`roo y
`A55,-Sm,” Exam,-ne,._Mark R. Powell
`[571
`ABSTRACT
`A,;’}i1de° _I;1’°J'e_°ti°n 5Y5‘em_ha"_i“8]31iq“id_°11;Yg£/131:6;
`w1
`a v1 eo unage, a pro_]ect1on amp w1t
`control, a zoom lens with a Zoom comm] mechanism’ a
`focusing lens with a focusing comm] mechanism an
`-
`-
`.
`.
`’
`".“d‘° System Wm‘ 3 "°1““‘e °°“"°1.’ 3 p‘°Je°“°“'1“T“p
`gght detecitoi, a lgealt sfinsor, a varxable-speed coohng
`d.“: a1°°“ ‘°1 “‘° “ "' “"3 "‘ ‘.“‘°’°P’°°e5‘°’ and 3
`1g1ta -to-ana og converter,
`21 d1splay, a keypad, an
`alarm/annuncxator, a power supply w1th ON/OFF
`control, and an infrared based remote control system
`able to control power ON/OFF, zoom, focus, picture,
`and sound volume.
`
`29 Claims, 38 Drawing Sheets
`
`[54] LIQUID CRYSTAL VIDEO PROJECIOR
`HAv1NG LAMP AND COOLING CONTROL
`AND REMOTE oprrcs AND PICFURE
`'I'rR
`A
`IBUTE CONTROLS
`Inventor: Kiyoshi Miyashita, Suwa, Japan
`[75]
`[73] Assignee:
`Seiko Epson Corporation, Tokyo,
`Japan
`
`[211 App1_ No; 314,330
`‘
`[22] Filed:
`
`Dec-23, 1991
`
`Related U.S. Application Data
`_
`.
`one .
`[63]
`gontgnuatlon of Ser. No. 605,292, Oct. 29, 1990, aban-
`[30]
`Foreign Application Priority Data
`om. 31, 1939 [JP]
`Japan .................................. 1-283532
`Y
`[51]
`Int. Cl.5 ...................... .. 1-I04l\ 5/74; GO3B 21/00
`[52] U.S. Cl. .................................... 358/236; 315/225;
`352/140; 353/57; 353/85; 353/101; 358/194.1
`[58] Field of Search .................................. .. 353/52-61,
`353/85’ 101; 352/139’ 140’ 198, 202’ 203;
`358/194.1, 231, 232,236, 60; 315/200 R, 209 R,
`129’ 133, 134’ 225
`'
`References Cited
`U.S. PATENT DOCUMENTS
`
`[55]
`
`...................... .. 353/85
`4,150,887 4/1979 Huber
`353/57 X
`4,283,658
`8/1981 Parker
`4,739,396 4/1988 Hyatt ................................... .. 358/60
`
`
`
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`MAIN POWER
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`70
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`30
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`XLNX-1011
`Page 1 of 48
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`

`
`U.S. Patent
`
`.
`
`_ Aug. 4, 1992
`
`Sheet 1 of 38
`
`5,136,397
`
`10'\
`
`24
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`SIGNAL INPUT
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`MODULE
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`(prior art)
`
`XLNX-1011
`Page 2 of 48
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`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 2 of 38
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`5,136,397
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`XLNX-1011
`Page 3 of 48
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`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 3 of 38
`
`I
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`5,136,397
`
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`CONTROL INPUT
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`DISPLAY APPARATUS
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`ALARM
`
`FIG.-3
`
`XLNX-1011
`Page 4 of 48
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`US. Patent
`
`Aug. 4, 1992
`
`Sheet 4 of 38
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`5,136,397
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`XLNX-1011
`Page 5 of 48
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`U.S. Patent
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`Aug. 4, 1992'
`
`Sheet 5 of 38
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`5,136,397
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`XLNX 101 1
`Page 6 of 48
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`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 6 of 38
`
`5,136,397
`
`INTERNAUEXTERNAL VIDEO
`
`023
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`VIDEO INIDEO 2
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`SIGNAL INPUT
`SOURCE
`SELECTOR
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`BLUE RASTER
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`E2 PROM MEMORY
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`80
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`no
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`XLNX-1011
`Page 7 of 48
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`U.S. Patent
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`_
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`. Aug. 4, 1§92
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`Sheet 7 of 38
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`A
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`XLNX-1011
`Page 8 of 48
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`‘Temperature Alarm"
`
`"Problem"
`
`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 8 of 38
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`5,136,397
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`XLNX 101 1
`Page 9 of 48
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`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 9 of 38
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`5,136,397
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`START
`
`100
`
`101 /
`
`SET EACH PORT
`
`TO STAND - BY
`
`102
`
`READ THE
`
`E-°-PROM TO RAM %
`
`READ
`D1 -D8 TO RAM
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`A
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`103
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`ON/OFF
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`CONTROL LOOP
`
`(WAITS FOR COMMAND)
`
`108
`
`FIG.-9
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`XLNX-1011
`Page 10 of 48
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`US. Patent
`
`Aug. '4, 1992
`
`Sheet 10 of 38
`
`5,136,397
`
`102
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`BEGAN
`SUBROUTINE
`
`YES
`
`1
`
`JAPANESE OSD
`
`ENGLISH OSD
`
`110
`
`
`
`
`SUPERIMPOSE
`FOCUS PATTERN
`ON VIDEO
`
`SUPERIMPOSE
`FOCUS PATTERN
`ON BLUE RASTER
`
`FlG._ 10A
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`XLNX-1011
`Page 11 of 48
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`U.S. Patent
`
`Aug. 4, 1992 A
`
`Sheet 11 of 38
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`5,136,397
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`102
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`/
`
`115
`
`@ NO
`118
`
`YES
`
`AUTO - FOCUSING
`ENABLED
`
` MANUAL
`POWER-FOCUSING
`
`ENABLED
`
`
`719
`
`® No
`
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`AUTO - FOCUS
`
`CONTINUOUS
`INITIALLY AT
`
`AUTO - FOCUS
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`POWER-ON
`
`'
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`
`122
`
`D7 = H AND D8 = H
`
`(NULL)
`
`123
`
`D7 = LAND D8 = H
`(OPTION 1)
`
`124
`
`D7 = H AND D8 = L
`(OPTION 2)
`
`125
`
`D7 = LAND D8 = L
`(OPTION 3)
`
`‘
`:
`
`A
`
`FIG._10B
`
`XLNX-1011
`Page 12 of 48
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`U.S. Patent
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`Aug. 4, 1992
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`Sheet 12 of 38
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`5,136,397
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`106
`/
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`131
`
`POWER SUPPLY
`OFF
`CONTROL
`
`
`ALREADY ON ?
`WAS POWER SUPPLY
`
`
`130
`
`YES
`
`
`NO
`
`
`
`132
`
` ‘PROJECTION
`LAMP FAILED"
`FLAG ON?
`
`N0
`
`134
`
`YES
`
`133
`
`LAMP FAILURE
`
`ERROR HANDLER
`
`LD4r OFF
`
`LD4g ON
`
`135
`
`TURN-ON MAIN
`
`POWER SUPPLY 141
`
`
`PROJECTION LAMP
`
`RESTART
`
`TO LOW SPEED 60 SECOND
`138
`LAMP
`
`OUTPUT TO DAC
`
`FIG._ 11A
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`XLNX-1011
`Page 13 of 48
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`TIME DELAY
`
`742
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`143
`
`FLASH L939
`
`136
`
`137
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`FAN MOTOR
`
`TURN-ON
`PROJECTION
`
`139
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`TIME DELAY
`
`H _
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`140
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`U.S. Patent
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`_
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`_Aug.4,19§2
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`Sheet 13 of 38
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`5,136,397
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`0
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`106
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`144
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`YES
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`145
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`D3AND D4= H ? - AUTO -FOCUS
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`NO
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`146
`
`INPUT SOURCE
`SELECTION
`
`ON OSD
`
`148
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`PROJECTION LAMP
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`
`131
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`108
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`FIG._ 11B
`.
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`XLNX-1011
`Page 14 of 48
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`150
`
`,52
`
`153
`
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`
`NO
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`ECEIVED?
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`I
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`I
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`I
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`I
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`IL ____________________ ___I ~~1o7
`
`

`
`U.S. Patent
`
`Aug.’ 4, 1992
`
`Sheet 14 of 38
`
`5,136,397
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`131
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`/
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`1
`
`BEGIN
`
`160
`EZPROM
`A WRITE CONTENTS
`OF RAM TO
`
`161
`
`TUFFZN-OFF
`% PROJECTION LAMP
`
`POWER SUPPLY
`
`162
`
`TURN-OFF
`
`MAIN POWER
`
`163
`
`FAN MOTOR
`
`TO HIGH SPEED
`
`164
`
`166
`
`
`
`LD4g OFF
`LD4r ON
`
`COOLED OFF YET?
`
`165
`
`YES 1
`
`FAN MOTOR
`
`A
`
`STOP
`
`FLASH LD3g
`- FLASH LD3r
`
`167
`
`168
`
`
`
`FIG._ 12
`
`XLNX-1011
`Page 15 of 48
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`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 15 of 33
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`5,136,397
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`133
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`/
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`—
`
`BEGIN
`
`SET ALARM
`
`170
`
`171
`
`
`
`.
`
`TURN-OFF
`PROJECTION LAMP
`POWER SUPPLY
`
`TURN-OFF MAIN
`POWER SUPPLY
`
`172
`
`173
`
`LD4g OFF
`LD4r ON
`»
`
`177
`
`
`
`WRITE CONTENTS
`OF2RAM TO
`E PROM
`
`LD3g OFF
`LD3r ON
`
`‘
`
`I-02 0N
`
`174
`
`175
`
`776
`
`>
`
`TIME DELAY
`
`STOP
`- FAN MOTOR
`
`178
`
`’79
`
`180
`
`SET LAMP
`FAILURE FLAG
`
`ALARM OFF IN RAM 92
`
`FIG._ 13
`
`XLNX-1011
`Page 16 of 48
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`
`US. Patent
`
`Aug. 4, 1992
`
`Sheet 16 of 38
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`5,136,397
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`BEGIN
`SUBROUTINE
`
`190
`
`SET LOOP
`COUNT TO ZERO
`
`141
`
`TIME DELAY
`
`1
`
`94
`
`1
`
`95
`
`TURN-OFF
`PROJECTION LAMP
`
`TURN-ON
`PROJECTION LAMP
`POWER SUPPLY
`
`
`
`
` 191
`POWER SUPPLY
`
`
`
`
`
`193
`
`FLASH LD2
`
` YES
`
`
`
`
`
` TURN—OFF
`
`PROJECTION LAMP
`POWER SUPPLY
`
`
`19
`
`9
`
`INCREMENT
`LOOP COUNT
`
`I
`
`201
`
`
`
`MAXIMUM
`LOOP COUNT?
`
`
`
`
`YES
`
`FLASH LD3g
`
`LD3r OFF
`
`133
`
`PROJECTION LAMP
`
`FAILURE HANDLER
`
`202
`
`LD2 OFF
`
`FIG._ 14
`
`RETURN
`
`XLNX-1011
`Page 17 of 48
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`

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`192
`
`FLASH LD3r
`
`LD3g OFF
`
`1
`
`TIME DELAY
`
`96
`
`
`
`197
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`

`
`U.S. Patent
`
`Aug. 4, 1992 A
`
`Sheet 17 of 38
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`5,136,397
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`BEGIN
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`SUBROUTINE
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`149
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`/
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`'
`
`FLASH LD1
`
`210
`
`211
`
`FAN MOTOR
`
`TO HIGH SPEED
`
`212
`
`
` TEMPERATURE
`
`TOO HIGH?
`
`N0
`
`213
`
`OVERHEATING?
`
`A
`
`1
`
`YES ,
`
`-
`
`LD1 OFF
`
`214
`
`WRITE
`CONTENES OF RAM
`
` TO E FROM
`
`215
`
`216
`
`FAN MOTOR
`
`TO LOW SPEED
`
`FIG._ 15A
`
`XLNX-1011
`Page 18 of 48
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`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 18 of 38
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`5,136,397
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`149
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`/
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`217
`
`TURN-OFF
`PROJECTION LAMP
`
`POWER SUPPLY
`
`218
`
`TURN-OFF
`
`MAIN POWER
`
`219
`
`
`
`220
`
`LD3g OFF
`
`FLASH LD3r
`
`COOLED OFF’?
`
`YES
`
`-
`
`222
`
`STOP
`FAN MOTOR
`
`»
`
`223
`
`LD1 OFF
`
`LD3r OFF
`
`FIG._ 15B
`
`XLNX-1011
`Page 19 of 48
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`U.S. Patent
`
`_ Aug. 4, 1992
`
`Sheet 19 of 38
`
`5,136,397
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`146
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`/
`
`BEGIN
`SUBROUTINE
`
`230
`
` SHOW
`ALL THE INPUT
`SOURCES ON OSD
`
`TIME DELAY
`
` 1
`
`23
`
`232
`
`
`
` SHOW
`SELECTED INPUT
`SOURCE ON OSD
`
`
`
`23
`
`3
`
`TIME DELAY '
`
`A
`
`234
`
`CLEAR OSD
`
`
`
`
`
`FIG._ 16
`
`XLNX-1011
`Page 20 of 48
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`1
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`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 20 of 38
`
`5,136,397
`
`239
`
`BEGIN
`susaourm
`
`SHOW NEW
`SELECTION
`ON OSD
`
`
`
`V
`
`M
`
`OUTPUT TO
`SELECTOR 74
`
`
`
`TIME DELAY
`
`CLEAR OSD
`
`FIG._ 17
`
`241
`
`
`
`2
`
`24
`
`243
`
`
`
`244
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`XLNX-1011
`Page 21 of 48
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`

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`240
`
`
`INCREMENT
`FLAG IN RAM
`
`
`
`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 21 of 38
`
`_ 5,136,397
`
`BEGIN
`
`-
`
`T
`
`SUBROUTINE
`
`250
`
`INDICATE
`AUTO - FOCUSING I
`ON OSD
`
`145
`
`251
`
`TURN-ON AFC SIGNAL
`(ENABLE 252 TO INTERRUPT)
`
`RECEIVER (INTERRUPT)
`
`SIGNAL DETECTED
`BY REMOTE CONTROL
`
`254
`
`TURN-OFF AFC
`SIGNAL
`
`'
`
`II I II I II I I l
`
` REMOTE CONTROL RCVR
`
`
`.
`
`258
`
`FOCUS COMPLETED
`MESSAGE TO OSD
`
`TU RN-OFF AFC
`SIGNAL
`
`259
`
`260
`
`TIME DELAY
`
`261
`
`CLEAROSD
`
`XLNX-1011
`Page 22 of 48
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`

`
`
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`I
`
`I I
`
`I
`
`II I
`
`I
`
`
`
`SIGNAL DETECTED BY
`ENDED ?
`
`YES
`
`A
`
`256
`
`TURN AFC SIGNAL
`BACK ON
`
`II II I I
`
`L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
`
`QE
`
`YES
`
`FIG._18
`
`

`
`US. Patent
`
`Aug. 4, 1992
`
`Sheet 22 of 38
`
`5,136,397
`
`269
`
`BEGlN
`SUBROUTINE
`
`
`
` FOCUS PATTERN
`YES
`ALREADY ON OSD?
`
`
`
`TURN-ON
`BLUE RASTER
`
`TURN-OFF
`BLUE RASTER
`
`275
`
`
`
`
`
`
`
`PUT FOCUS
`PATTERN
`ON THE OSD
`
`
`CLEAR OSD
`FOCUS PATTERN
`
`
`RETURN
`
`
`
`FIG._ 19
`
`XLNX-1011
`Page 23 of 48
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`

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`

`
`U.S. Patent
`
`Aug. 4, 1992 '
`
`Sheet 23 of 38
`
`5,136,397
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`
`
`
`
`
`
`
`BEGIN
`SUBROUTINE
`
`I
`
`280
`
`TURN—ON
`PFF SIGNAL
`
`STILLRECEIVING
`
`POWER FOCUS FAR
`COMMAND?
`
`NO
`
`PFF SIGNAL
`
`282
`
`
`
`FIG._20
`
`BEG IN
`SUBROUTINE
`
`285
`
`TURN-ON
`PFN SIGNAL
`
`
`
`
`
`
`STILL RECEIVING
`POWER FOCUS NEAR
`COMMAND?
`
`No
`
`'
`
`7
`
`28
`
`PFN SIGNAL
`
`
`
`
`
`FIG._21
`
`XLNX-1011
`Page 24 of 48
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`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 24 of 38
`
`5,136,397
`
`BEGIN
`SUBROUTINE
`
`_
`‘
`
`
`
`290
`
`TURN-ON
`PZW SIGNAL
`
`I
`
`
`
`
`
`STILLRECEIVING
`
`POWER ZOOM WIDE
`COMMAND?
`
`PZW SIGNAL
`
`NO
`
`
`
`
`
`FIG._22
`
`BEGIN
`SUBROUTINE
`
`
`
`TURN-ON
`Pzr SIGNAL
`
`292
`
`
`
`
`
`295
`
`I
`
`
`
`
`STILL RECEIVING
`POWER ZOOM TIGHT
`COMMAND?
`
`No
`
`PZT SIGNAL
`
`7
`
`29
`
`
`
`.
`
`
`
`.FIG._23
`
`
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`XLNX-1011
`Page 25 of 48
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`

`
`U.S. Patent
`
`_
`
`.Aug.4,19-92
`
`Sheet 25 of as
`
`5,136,397
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`BEGIN
`SUBROUTINE
`
`
`
`300
`
`TUFIN-ON
`PSU SIGNAL
`
`
`
`
`
`
`
`
`
`TURN-OFF
`PSD SIGNAL
`
`FIG._25
`
`XLNX-1011
`Page 26 of 48
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`

`
`
`
`
`
`
`
`
`
`POWER SWING UP
`COMMAND?
`
`
`STILLRECEIVING
`
`
`NO
`
`PSU SIGNAL
`
`302
`
`
`
`
`
`FIG._24
`
`BEGIN
`SUBROUTINE
`
`
`
`305
`
`TURN—ON
`PSD SIGNAL
`
`
`
`STILL RECEIVIN
`POWER SWING DOWN
`COMMAND?
`
`
`
`
`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 26 of 38
`
`5,136,397
`
`.
`
`BEGIN
`
`SUBROUTINE
`
`
`
`:
`
`
`
`A
`
`
`
`
`
`p§§Rs“¢°”*
`p§H”s'T£3%'XL
`I NAL
`(swme. UP)
`(SWING DOWN)
`
`
`
`
` 316
`
` TU RN-OFF
`
`PSD SIGNAL
`
`TURN-OFF
`PSU SIGNAL
`
`
`
`FIG._26
`
`XLNX-1011
`Page 27 of 48
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`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 27 of 38
`
`5,136,397
`
`BEGIN
`SUBROUTINE
`
`319
`
`320
`
`SHOW CURRENT PICTURE
`ATTRIBUTE SELECTION
`
`ON THE OSD
`
`TIME DELAY
`
`321
`
`322
`
`“O
`
`325
`
`
`
`
` lI+R N‘?!
`COMMAND
`RECEIVED?
`
`
`
`
`
`YES
`
`CLEAR THE oso
`
`
`
`
`
`323
`
`
`
`
`
`V N0
`
`COMMAND TO
`SELECT NEXT PICTURE
`ATTRIBUTE RECEIVED?
`
`
`YES
`
`324
`
`INCREMENT PICTURE
`ATTRIBUTE SELECTION
`
`FLAG IN RAM
`
`HG 2,
`
`326
`
`
`'+" COMMAND
`RECEIVED?
`
`
`
`NO
`
`YES
`
`327
`
`328
`
`
`
`
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`XLNX-1011
`Page 28 of 48
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`

`
`US. Patent
`
`Aug. 4, 1992
`
`Sheet 28 of 38
`
`5,136,397
`
`I
`
`BEGIN
`
`SUBROUTINE
`
`330
`
`ZERO THE
`LOOP COUNTER
`
`/327
`
`331
`
`INCREMENT THE
`DIGITAL VALUE OF
`THE PRESENTLY SELECTED
`
`PICTURE ATTRIBUTE BY ONE
`
`332
`
`
`
`UPDATE
`INDICATION
`ON OSD
`
`333
`
`FIRST PASS
`THRU LOOP?
`
`YES
`
`NO
`
`SHORTER
`TIME DELAY
`
`LONGER
`TIME DELAY
`
`533
`
`
`
`336
`
`INCREMENT LOOP
`COUNTER BY ONE
`
`FIG._28A
`
`XLNX-1011
`Page 29 of 48
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`

`
`U.S. Patent
`
`Aug. 4, 1992 '
`
`Sheet 29 of 38
`
`5,136,397
`
`327
`/
`
`337
`
`
`
`
` I+I Il_I
`COMMAND
`RECEIVED?
`
`
`
`NO
`
`340
`
`TIME DELAY
`
`II_I
`N+lI
`
`COMMAND
`
`RECEIVED?
`
`343
`
`
`
`342
`
`ZERO LOOP
`COUNTER
`
`ERASE
`INDDICATION
`
`ON OSD
`
`338
`
`RETURN
`
`
` COMMAND TO
`
`SELECT NEXT PICTURE
`ATTRIBUTE RECEIVED?
`
`
`
`
`YES
`
`344
`
`
`
`INCREMENT PICTURE
`ATTRIBUTE SELECTION
`FLAG IN RAM
`
`
`
`
`NO
`
`
`
`339
`
` COMMAND
`
`RECEIVED?
`
`YES
`
`No
`
`328
`
`319
`
`FIG._28B
`
`XLNX-1011
`Page 30 of 48
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`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 30 of 38
`
`5,136,397
`
`seem
`
`SUBROUTINE
`
`350
`
`zeno THE
`LOOP coumen
`
`/323
`
`351
`
`DECREMENT THE
`DIGITAL VALUE OF
`THE PRESENTLY SELECTED
`
`PICTURE ATTRIBUTE BY ONE
`
`352
`
`UPDATE
`INDICATION
`
`ON OSD
`
`353
`
` FIRST PASS
`YES
`THRU LOOP?
`
`
`SHORTER
`TIME DELAY
`
`LONGER
`TIME DELAY
`
`553
`
`
`
`356
`
`INCREMENT LOO
`COUNTER BY ONE
`
`FIG._29A
`
`XLNX-1011
`Page 31 of 48
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`
`U.S. Patent
`
`_
`
`,Aug.4,19§2
`
`Sheet 31 of 33
`
`5,136,397
`
`328
`/
`
`357
`
`NO
`
`
`
`II_I
`I+I
`COMMAND
`RECEIVED?
`
`
`
`360
`
`TIME, DELAY
`
`
`n_n
`n+0!
`COMMAND
`
`RECEIVED?
`
`353
`
`
`
`362
`
`zeno LOOP
`courmsn
`
`ERASE
`INDDICATION
`
`ON OSD
`
`358
`
`I
`
`RETURN
`
`
` COMMAND TO
`
`SELECT NEXT PICTURE
`ATTRIBUTE RECEIVED?
`
`
`N0
`
`
`
`YES
`
`344
`
`INCREMENT PICTURE
`ATTRIBUTE SELECTION
`FLAG IN RAM
`
`359
`
`
`"+" COMMAND
`RECEIVED?
`
`
`
`YES
`
`No
`
`327
`
`319
`
`PLUS
`
`PICTURE
`
`XLNX-1011
`Page 32 of 48
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`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 32 of 38
`
`5,136,397
`
`
`
`SHOW DEFAULT
`ATTRIBUTE SETTINGS
`ON THE OSD
`
`
`
`
`SET ALL ANALOG
`OUTPUT CHANNELS
`VALUES
`OF DAC TO DEFAULT
`
`BEGIN
`SUBROUTINE
`
`369
`
` 372
`
`A
`
`LOAD DAC A
`
`
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`XLNX-1011
`Page 33 of 48
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`

`
`
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`
`
`373
`
`A
`
`TIME DELAY «
`
`
`
`CLEAR OSD
`DISPLAY
`
`
`
`
`
`FIG._30
`
`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 33 of 38
`
`5,136,397
`
`seem
`
`SUBROUTINE
`
`ZERO THE
`LOOP COUNTER
`
`380
`
`381
`
`INCREMENT THE DIGITAL
`VALUE OF THE SOUND
`
`VOLUME BY ONE
`
`LOAD DAC
`
`382
`
`383
`
`SHOW CURRENT
`VALUE ON THE OSD
`
`
`
`A
`
`334
`
`/379
`
`YES
`
`FIRST PASS
`THRU LOOP’?
`
`NO
`
`
`
`
`SHORTER
`TIME DELAY
`
`A
`
`LONGER
`TIME DELAY
`
`386
`
`387
`
`INCREMENT LOOP
`COUNTER
`
`0 FIG._31A
`
`XLNX-1011
`Page 34 of 48
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`US. Patent
`
`Aug. 4, 1992
`
`Sheet 34 of as
`
`5,136,397
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`379
`
`388
`
`
`
`
`ANY SOUND VOLUME
`COMMAND RECEIVED?
`
`390
`
`TIME DELAY
`
`COMMAND RECEIVED?
`
`ANY SOUND VOLUME
`
`
`
` 392
`
`ZERO THE
`LOOP COUNTER
`
`39.3
`
`ERASE
`INDDICATION
`
`ON OSD
`
`389
`
`
`COMMAND RECEIVED?
`
`
`
`V55 '
`
`"0
`
`399
`
`DECREASE
`- souno VOLUME
`
`FIG._31B
`
`XLNX-1011
`Page 35 of 48
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`

`
`U.S. Patent
`
`Aug. 4, 1992"
`
`Sheet 35 of 38
`
`5,136,397
`
`BEGIN
`
`SUBROUTINE
`
`400
`
`ZERO THE
`LOOP COUNTER
`
`/399
`
`401
`
`INCREMENT THE DIGITAL
`VALUE OF THE SOUND
`
`VOLUME BY ONE
`
`LOAD DAC
`
`402
`
`403
`
`
`
`SHOW CURRENT
`VALUE ON THE OSD
`
`FIRST PASS
`THRU LOOP?
`
`NO C
`
`SHORTER
`TIME DELAY
`
`404
`
`YES
`
`
`
`
`LONGER
`TIME DELAY
`
`407
`
`406
`
`INCREMENT LOOP
`COUNTER
`
`Q
`
`FlG._32A
`
`XLNX-C1011
`Page 36 of 48
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`

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`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 36 of 38
`
`5,136,397
`
`39.9
`
`408
`
`
`
`ANY SOUND VOLUME
`COMMAND RECEIVED?
`
`410
`
`TIME DELAY
`
`
`
` ANY SOUND VOLUME
`COMMAND RECEIVED?
`
`412
`
`ZERO THE
`LOOP COUNTER
`
`413
`
`ERASE
`INDDICATION
`
`ON OSD
`
`K409
`
`
`SOUND DECREASE
`
`COMMAND RECEIVED?
`
`
`
`NO
`
`
`YES
`
`.
`
`379
`
`INCREASE
`SOUND VOLUME
`
`FlG,_32B
`
`XLNX-1011
`Page 37 of 48
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`

`
`U.S. Patent
`
`_
`
`_ Aug. 4, 1592
`
`Sheet 37 of 33
`
`5,136,397
`
`BEGlN
`SUBROUTINE
`
`
`
`
`
`ALREADY
`MUTED?
`
`
`
`
`
`
`
`OUTPUT MINIMUM
`OUTPUT ORIGINAL
`SOUND VOLUME
`SOUND VOLUME
`D/A VALUE
`D/A VALUE
`
`
`
`
`
`
`
`SHOW MUTED
`CLEAR OSD
`STATUS ON OSD
`DISPLAY
`
`
`
`
` RETURN
`
`FIG,_33
`
`XLNX-1011
`Page 38 of 48
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`

`
`U.S. Patent
`
`Aug. 4, 1992
`
`Sheet 38 of 38
`
`5,136,397
`
`VIDEO 1
`
`
`
`43
`
`432
`
` 0
`
`
`vmeoz
`
`OPTION
`
`434
`
`?
`
`*
`
`
`
`4
`
`
`
`%
`
`4
`
`FIG._34
`
`FIG._35
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`
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`XLNX-1011
`Page 39 of 48
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`COLOR
`DENSITY
`
`CONTRAST
`
`44
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`2
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`44
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`4
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`44
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`6
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`44
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`8
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`BRiGHTNESS
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`SHARPNESS
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`

`
`1
`
`5,136,397
`
`2
`liquid crystal light valve 26 causing a projected image
`to be focussed by lens unit 28 on to screeen 29. The fan
`16 forces cooling air through system 10, but whenever
`the airflow is blocked, system 10 will overheat as a
`result of the large amount of heat being dissipated inter-
`nally by projection lamp 18. The over-temperature
`thermostat 20 is designed to trip at abnormally high heat
`and thus shut off the projection lamp 18. This action
`prevents damage to system 10 by oveheating. Airflow
`through system 10 can be inadvertently blocked and no
`warning that the thermostat 20 is about to trip is given.
`No outside indication is given that thermostat 20 has
`tripped off. A user could wrongly asume that the pro-
`jection lamp 18 has burnt out and needs replacing.
`The volume, picture, signal input, and lens settings of
`prior art projection systems usually require manual
`adjustment at the control module 22, via input module
`24. This leads to inconvenience, because the positions of
`the screen, the video projector, and the user are nor-
`mally several feet apart. Users must therfore move over
`to the projector system in order to adjust it. This will
`usually prohibit placing such projector systems out of
`reach, e.g., on the ceiling of a theater, bar, or restaurant.
`SUMMARY OF THE INVENTION
`
`LIQUID CRYSTAL VIDEO PROJECTOR HAVING
`LAMP AND COOLING CONTROL AND REMOTE
`OPTICS AND PICTURE ATTRIBUTE CONTROLS
`
`This is a continuation of copending application Ser.
`No. 07/605,292 filed Oct. 29, 1990 now abandoned.
`BACKGROUND OF THE INVENTION
`1. Field of the Invention
`THis invention relates generally to video projectors,
`and more specifically to liquid crystal based video pro-
`jection systems.
`2. Description of the Prior Art
`Large screen televisions presently employ three ba-
`sic, alternative technologies. The first is large screen
`direct view cathode ray tubes (CRTs) reaching 35"
`(diagonal), the second is rear projection, and thr third is
`front projection on to a screen, much like the familiar
`movie projector. Direct view CRT screens larger than
`35' are extremely expensive, and do not sell well into
`the consumer market as a result of the expense. Both
`rear and front projection television and video systems
`traditionally use CRTs. However, since the light pro-
`duced by a CRT is coming from phosphorescence, the
`final light level is very limited by having to spread the
`light over an area up to ten times larger that the area of
`the CRT. One solution that has become very popular is
`to use three separate CRTs, one red, one green, and one
`blue. Monochrome CRTs can be forced to emit much
`more light than a single color CRT, because the elec-
`tron shadow mask in back of the screen phosphors can
`be eliminated and far more electrons will strike the
`phosphors, which in turn produces more light. The
`three colors are then combined with lenses to form
`color images. And since the color image is the product
`of three very bright CRTs, the combination is as much
`as ten times brighter than was possible before. Even so,
`CRTs have limits, and new ways have been found to
`further increase projection light levels.
`Liquid crystal panels, similar to LCD watches, emit
`no light on their own, but will block light shining
`through. In an LCD watch, a small light bolt is placed
`behind the LCD panel, and a switch will turn it on for
`viewing in the dark. In daylight, the LCD will reflect
`sunlight or indoor light and is very readable. Video
`projection systems using liquid crystal panels have
`begun to appear in commercial products sold in the
`United States, e.g. by Sharp Corporation (Japan). These
`systems typically place a high output metal halide lamp
`behind a liquid crystal panel with a video image and
`project that image up onto a screen using a system of
`lenses. An Oct. 1989 article by S. Kohzai, et al., de-
`scribes a liquid crystal video projection system having a
`metal halide projection lamp, dichroic mirrors, three
`liquid crystal panels and associated lenses to produce
`full-color large-screen video. (Irztemational Televison
`Engineering Journal (ITEJ) Technical Report Vol. 13,
`No. 53, PIL49-54.)
`Prior art video projection systems are typically con-
`structed as is shown in FIG. 1. A video projection sys-
`tem referred to by the general reference numeral 10, is
`comprised of an on/off switch 12 connected to a power
`supply 14, a cooling fan 16, a projection lamp 18 with an
`over-temperature bimetal thermostat 20, a control mod-
`ule 22, an input module 24, a liquid crystal light valve
`26, a lens unit 28, and a projection screen 29. Light from
`projection lamp 18 shines through an image formed on
`
`5
`
`10
`
`15
`
`20
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`25
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`30
`
`35
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`45
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`50
`
`55
`
`65
`
`According to this invention, a liquid crystal video
`projection system comprises a liquid crystal panel with
`a video image, a projection lamp with ON/OFF con-
`trol, a zoom lens with a zoom control mechanism, a
`focus lens with a focus control mechanism, an audio
`system with volume control, a projection-lamp light
`detector, a heat sensor, a variable-speed cooling fan, a
`control module having a microprocessor, a display, a
`keypad, an alarm/annunciator, a power supply with
`ON/OFF control, and an infrared based remote control
`system.
`An advantage of the present invention is that thereis
`improved overheating protection with indicators that
`assist a user in averting trouble before failure occurs,
`and means to quickly troubleshoot or respond to a prob-
`lem once the problem has been identified.
`A further advangage of the present invention is that
`remote adjustment of the system can be made from the
`normal viewing position of the user relative to the sys-
`tem. THe projected image can be remotely focused,
`zoomed in and out, and moved up or down on the pro-
`jection screen.
`These and other objects and advantages of the pres-
`ent invention will no doubt become obvious to those of
`ordinary skill in the art after having read the following
`detailed description of the preferred embodiments
`which are illustrated in the various drawing figures.
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a block diagram of a prior art video projec-
`tor system;
`FIG. 2 is a functional block diagram of a liquid crys-
`tal video projector (LCVP) embodiment that incorpo-
`rates the present invention;
`FIG. 3 is a block diagram of an alternate micro-
`processor-based embodiment of a portion of -the LCVP
`in FIG. 2;
`FIG. 4 is a schematic diagram of the input unit show-
`ing details of the command pushbutton switch matrix
`and option toggle switches;
`FIG. 5 is a schematic diagram of the main power and
`projection lamp power controllers and the light and
`temperature detectors;
`
`XLNX-1011
`Page 40 of 48
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`5,136,397
`
`4
`FIGS. 32A and 32B are flowcharts of a subroutine to
`decrease sound volume;
`FIG. 33 is a flowchart of a subroutine to toggle
`(sound) mute on and off;
`FIG. 34 shows the rotation of choices possible for
`signal input source selection; and
`FIG. 35 shows the rotation of picture attributes that
`can be selected in the subroutine of FIG. 27.
`
`~
`
`3
`FIG. 6 is a block diagram showing the interfacing
`details for the signal input source selector, EZPROM
`memory, lens controller, and the DAC connections to
`the I/O port;
`FIG. 7 is a schematic diagram of the display LED
`interfaces and a block diagram representation of the
`on-screen display (OSD);
`FIG. 8 is a schematic diagram of the variable speed
`fan controller and the alarm;
`FIG. 9 is a flowchart of an exemplary “top-level”
`control program.
`FIGS. 10A and 10B are flowcharts of a subroutine
`that does power-on initiaifiation housekeeping duties;
`FIGS. 11A abnd 11B are flowcharts of a main power
`and projection lamp start-up subroutine;
`FIG. 12 is a flowchart of a subroutine to orderly shut
`down the main power and projection lamp power;
`FIG. 13 is a flowchart of a subroutine to handle a
`failure of the projection lamp;
`FIG. 14 is a flowchart of a subroutine to restart the
`projection lamp;
`FIGS. 15A and 15B are flowcharts of a subroutine to
`respond to an over-temperature condition;
`FIG. 16 is a flowchart of a subroutine to display the
`current signal input source selection on the on-screen
`display;
`-
`FIG. 17 is a flowchart of a subroutine to step the
`signal input source selection to the next source and to
`display the activity on the on-screen display;
`FIG. 18 is a flowchart of a subroutine to automati-
`cally focus the LCVP together with an interrupt sub-
`routine to temporarily disable the auto-focus:
`FIG. 19 is a flowchart of a subroutine to toggle a
`display of a focusing target pattern on and off the pro-
`jection screen;
`FIG. 20 is a flowchart of a subroutine to drive focue
`out (far) during a command from the remote control
`transmitter;
`FIG. 21 is a flowchart of a subroutine to drive focus
`in (near) during a command from the remote control
`transmitter;
`FIG. 22 is a flowchart of a subroutine to zoom wider
`during a command from the remote control transmitter;
`FIG. 23 is a flowchart of a subroutine to zoom tighter
`during a command from the remote control transmitter;
`FIG. 24 is a flowchart of a subroutine to drive the
`angle of the lenses such that the projected image is
`moved up on the projection screen; ‘
`FIG. 25 is a flowchart of a subroutine to drive the
`angle of the lenses such that the projected image is
`moved down on the projection screen;
`FIG. 26 is a flowchart of a subroutine to automati-
`cally center the up and down position of the projected
`image;
`FIG. 27 is flowchart of a subroutine to allow the
`selection and adjustment of a plurality of picture attri-
`butes (e.g., brightness, color, and hue);
`FIGS. 18A and 28B are flowcharts of a subroutine to
`increment a picture attribute selected in the subroutine
`of FIG. 27;
`FIGS. 29A and 29B are flowcharts of a subroutine to
`decrement a picture attribute selected in the subroutine
`of FIGI27;
`FIG. 30 is a flowchart of a subroutine to set all the
`
`picture attributes to a default value;
`FIGS. 31A and 31B are flowcharts of a subroutine to
`increase sound volume;
`
`10
`
`15
`
`20
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`25
`
`30
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`35
`
`40
`
`45
`
`55
`
`65
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`FIG. 2 is a liquid crystal video projector (LCVP),
`referred to by the general reference numeral 30, com-
`prising a control unit 32 having a control input interface
`34, an instruction decoder 36, a power controller 38, a
`signal source controller 40, a picture controller 42, an
`audio controller 44, a lens control interface 46, a fan
`motor control interface 48, a display controller 50, a
`light detector interface 52, a temperature detector inter-
`face 54, an alarm controller 56, and a timer 58. TI-Ie
`LCVP 30 is further comprised of a control input 60, a
`display 62, an alarm 64, a light detector 66, a tempera-
`ture detector, 68, a main power controller 70, a projec-
`tion lamp power controller 71, a signal source selector
`74, a fan motor controller 76, a fan motor 78, a memory
`80, a lens controller 82, and a digital-to-analog con-
`verter (DAC) 84. DAC 84 actually comprises six inde-
`pendent DACs, one each controlling five picture attri-
`butes and sound volume, described below, in an othe-
`wise conventional
`television receiver. A projection
`lamp (not shown) connected to projection lamp power
`controller 72 is preferably of the metal halide type.
`Metal halide lamps require high starting voltages for
`ignition. Both the starting and running voltages for the
`projection lamp are supplied by the projection lamp
`power controller and an internal ballast. Light detector
`66 has a current sensing resistor in series with the pro-
`jection lamp. Any failure of the projection lamp to light
`will be indicated by an abnormally low voltage across a
`sensing resistor (R1 in FIG. 5). After a pre-set time, the
`light detector interface 52 reports a failure of the lamp
`to tum-on to power controller 38.
`When LCVP 30 is first turned on, the projection
`lamp may not start right away. If the light detector 66
`senses no light, a number of retries will be attempted by
`the power controller 38 via projection lamp power
`controller 72. A failure of the lamp to start after a preset
`number or retries is stored in the memory 80 and is also
`sent to the display 62 via the display controller 50. The
`temperature detector 68 and temperature detector inter-
`face 54 sense the operating temperature of LCVP 30
`and send a signal to the fan motor controller interface
`48 to provide additional or reduced cooling, in order to
`maintain an optimum operating temperature. The fan
`motor 78 forces a variable amount of air through LCVP
`30 to keep it from overheating. Several sources of sig-
`nals may be selected by the signal controller 40 and
`signal source selector 74. The signal selection is respon-
`sive to the instruction decoder 36. For example, selec-
`tions among camera, VCR, and broadcast signal input
`sources can be made. The picture controller 42 is also
`responsive to the instruction decoder 36 and provides
`control to set the level of the picture attributes of color,
`hue, brightness, contrast, and sharpness (peaking). The
`level of each of these picture attributes is provided as
`digital output to the DAC 84 and