throbber
(11) Japanese Unexamined Utility Model Registration
`Application Publication No. 5-69732
`(43) Publication Date: September 21, 1993
`(21) Application No. 4-7110
`(22) Application Date: February 20, 1992
`(71) Applicant: Toshiba Corporation
`(71) Applicant: Toshiba AVE Corporation
`(72) Inventor: Koichi SERAKU
`(74) Agent: Patent Attorney, Takashi HONDA
`(54) [Title of Device] BACKLIGHT STRUCTURE FOR LIQUID
`CRYSTAL DISPLAY
`(57) [ABSTRACT]
`[Object] To provide a backlight structure for a liquid
`crystal display which can illuminate the liquid crystal
`display from a back surface side thereof without increasing
`the size of a mounting space for the liquid crystal display.
`[Construction] Light sources 13 are provided at both ends
`of a second glass substrate 11b of a liquid crystal display
`11 having first and second glass substrates, and a light
`reflecting layer 18 is provided on a surface of the second
`glass substrate 11b opposite to the first glass substrate
`11a by the intermediary of a light diffusing layer 17.
`[CLAIM]
`[Claim 1] A backlight structure for a liquid crystal
`display including a first glass substrate, a second glass
`
`- 1 -
`
`Sony Corp. Exhibit 1029
`
`SONY_000887
`
`

`
`substrate and liquid crystal disposed therebetween,
`configured to irradiate light from the second glass
`substrate side toward the first glass substrate side,
`comprising: light sources provided at both ends of the
`second substrate and configured to irradiate light toward
`the second glass substrate; and a reflecting layer
`configured to reflect light and provided on a surface of the
`second glass substrate opposite to a surface on which the
`liquid crystal is arranged with a diffusing layer configured
`to diffuse light interposed therebetween.
`[Brief Description of the Drawings]
`
`[Fig. 1] Fig. 1 is a cross-sectional view taken along
`the line A-A in Fig. 2 in a state in which a liquid crystal
`display is mounted.
`
`[Fig. 2] Fig. 2 is an exploded perspective view for
`explaining a backlight structure for the liquid crystal
`display of the first example of the present invention.
`
`[Fig. 3] Fig. 3 is an exploded perspective view
`illustrating a mounting structure for a liquid crystal
`display of the related art.
`
`[Fig. 4] Fig. 4 is an exploded perspective view of a
`backlight unit of the related art.
`
`[Fig. 5] Fig. 5 is a cross-sectional view taken along
`the line B-B in Fig. 3 in a state in which the liquid
`crystal display is mounted.
`
`- 2 -
`
`SONY_000888
`
`

`
`[Reference Numerals]
`11
`liquid crystal display
`11a first glass substrate
`11b second glass substrate
`11c liquid crystal
`13
`light source
`18
`reflecting layer
`17
`diffusing layer
`
`[Detailed Description of the Device]
`[0001]
` [Field of Industrial Application]
`
`The present invention relates to a backlight structure
`configured to illuminate a liquid crystal display from a
`back surface side thereof.
`[0002]
` [Description of the Related Art]
`
`A mounting structure for a liquid crystal display of
`the related art is illustrated in Fig. 3 to Fig. 5.
`[0003]
`
`Mounting of a liquid crystal display (LCD) 1 is
`performed as illustrated in Fig. 3 by fitting the LCD 1 in a
`holding frame 2, positioning a rubber connector 3 and a
`backlight unit 4 on a back surface side of the LCD 1,
`inserting mounting legs 2a of the holding frame 2 into
`
`- 3 -
`
`SONY_000889
`
`

`
`square holes 6a of a printed wiring board 6, and twisting
`distal ends of the mounting legs 2a on a back surface side
`of the printed wiring board 6. Accordingly, the LCD 1 is
`fixed to the printed wiring board 6, and is electrically
`connected to the printed wiring board 6 via the rubber
`connector 3.
`[0004]
`
`In contrast, the backlight unit 4 includes a light
`guide panel 8, LEDs 9, 9 to be positioned at both end
`surfaces of the light guide panel 8, and a reflecting case
`10 to which the light guide panel 8 and the LEDs 9, 9 are
`fitted as illustrated in Fig. 4, is positioned on the back
`surface side of the LCD 1 when mounting the LCD 1 on the
`printed wiring board 6, and terminals 9a of the LEDs 9 are
`soldered to the printed wiring board 6. Therefore, as
`illustrated in Fig. 5, light irradiated from the LEDS 9 is
`guided to the light guide panel 8, and is reflected by the
`reflecting case 10, thereby irradiating the back surface
`side of the LCD 1. In this case, the reflecting case 10 is
`formed of a white material so as to reflect light
`efficiently, and a back surface 8a of the light guide panel
`8 is formed to have uneven surface so as to diffuse light.
`Therefore, the back surface side of the LCD 1 is irradiated
`with light of the LEDs 9 uniformly.
`[0005]
`
`- 4 -
`
`SONY_000890
`
`

`
`According to the structure of the related art, the
`
`light guide panel 8 configured to guide light of the LEDs 9
`is required as a backlight structure that illuminates the
`LCD 1, and the light guide panel 8 needs to guide light
`irradiated from the LEDs 9 efficiently. Therefore, the
`thickness thereof cannot be reduced to a thickness smaller
`than that of the LEDs 9. Therefore, the height of the LED 1
`from the printed wiring board 6 is increased, and hence a
`problem of an increase of a space required for mounting the
`LED 1 arises.
`[0006]
` [Problem to be Solved by the Device]
`
`As described above, in the back light structure of the
`liquid crystal display of the related art, since there is a
`need to provide the light guide panel for guiding light from
`the light sources on a bottom surface side of the liquid
`crystal display, and hence a problem that the mounting space
`for the liquid crystal display is increased correspondingly
`arises.
`[0007]
`
`The present invention is intended to solve the
`problems of the related art, and intended to provide a
`backlight structure for a liquid crystal display in which
`the liquid crystal display can be illuminated without
`increasing a mounting space for the liquid crystal display.
`
`- 5 -
`
`SONY_000891
`
`

`
`[0008]
` [Means for Solving the Problem]
`
`In the present invention, in a backlight structure for
`a liquid crystal display including a first glass substrate,
`a second glass substrate and liquid crystal disposed
`therebetween, configured to irradiate light from the second
`glass substrate side toward the first glass substrate side,
`comprising: light sources provided at both ends of the
`second substrate and configured to irradiate light toward
`the second glass substrate; and a reflecting layer
`configured to reflect light and provided on a surface of the
`second glass substrate opposite to a surface on which the
`liquid crystal is arranged with a diffusing layer configured
`to diffuse light interposed therebetween.
`[0009]
` [Operations]
`
`In the present invention, light irradiated from light
`sources is guided by the second substrate, is diffused by
`the diffusing film arranged on a back surface side of the
`second substrate, and is reflected by a reflecting film.
`Therefore, a liquid crystal display is uniformly irradiated
`with the light from the light sources from the back surface
`side.
`[0010]
`[Example]
`
`- 6 -
`
`SONY_000892
`
`

`
`Referring now to Fig. 1 and Fig. 2, an example of the
`
`present invention will be described.
`[0011]
`
`Fig. 2 is an exploded perspective view for explaining
`a mounting structure for a liquid crystal display, and Fig.
`1 is a cross-sectional view taken along the line A-A in Fig.
`2 in a state in which the liquid crystal display is mounted.
`[0012]
`
`Mounting of a liquid crystal display (LCD) 11 is
`performed as illustrated in Fig. 2 by fitting the LCD 11
`having LEDs 13, 13 which serve as light sources positioned
`at both ends thereof in a holding frame 14, positioning a
`rubber connector 16, a diffusing film 17, and a reflecting
`film 18 on a back surface side of the LCD 11, inserting
`mounting legs 14a of the holding frame 14 into square holes
`20a of a print wiring board 20, and twisting distal ends of
`the mounting legs 14a on the back surface side of the print
`wiring board 20. Accordingly, the LCD 11 is fixed to the
`printed wiring board 20, and is electrically connected to
`the printed wiring board 20 via the rubber connector 16.
`[0013]
`
`By mounting the LCD 11 on the print wiring board 20 in
`a manner described above, the LEDs 13, 13 illustrated in Fig.
`1 are positioned at the both ends of the LCD 11, and the
`diffusing film 17 and the reflecting film 18 are positioned
`
`- 7 -
`
`SONY_000893
`
`

`
`between the LCD 11 and the print wiring board 20. With
`these components, a backlight structure that illuminates the
`LCD 11 from the back surface side thereof is configured.
`The configuration will be described in detail below.
`[0014]
`
`The LCD 11 includes a first glass substrate 11a which
`is a display surface side, a second glass substrate 11b,
`which is the back surface side, and liquid crystal 11c
`interposed therebetween, the LEDs 13, 13 are positioned at
`both end surfaces of the second glass substrate 11a [sic -
`it seems to be an error in the publication, which should be
`"11b"] of the LCD 11, and terminals 13a are soldered to a
`pattern (which is not illustrated) on the printed wiring
`board 20. Therefore, light irradiated from the LEDs 13 is
`guided into the second glass substrate 11a [sic - it seems
`to be an error in the publication, which should be "11b"].
`[0015]
`
`The diffusing film 17, which is a diffusing layer, is
`in tight contact with the second glass substrate 11a, and
`the reflecting film 18, which is a reflecting layer, is in
`tight contact with the diffusing film 17.
`[0016]
`
`The diffusing film 17 is formed of a transparent thin
`plate, and uneven surface such as frosted glass is formed on
`a surface side that comes into contact with the reflecting
`
`- 8 -
`
`SONY_000894
`
`

`
`film 18. Therefore, light guided by the second glass
`substrate 11a is diffused by the diffusing film 17. The
`reflecting film 18 is formed of a white thin plate to allow
`easy reflection of light. Therefore, light reaching the
`reflecting film 18 is reflected by the reflecting film 18,
`and does not leak outside.
`[0017]
`
`In this configuration, light irradiated by the LEDs 13
`is guided into the second glass substrate 11b, is diffused
`by the diffusing film 17, is reflected by the reflecting
`film 18, and reaches the first glass substrate 11a.
`Therefore, by not using the light guide panel 8 as of the
`related art, the height of the LCD 11 from the print wiring
`board 20 can be reduced and, in addition, the LCD 11 can be
`illuminated uniformly by using the LED 13.
`[0018]
`
`In this example, the reflecting film 18 is used as the
`reflecting layer. However, the surface of the print wiring
`board 20 may be coated in white to use as a reflecting layer,
`for example.
`[0019]
`[Advantages]
`
`In the present invention, as described above, since
`the second glass substrate out of the first and second glass
`substrates is used as a light guide panel to illuminate the
`
`- 9 -
`
`SONY_000895
`
`

`
`liquid crystal display from the back surface side, the
`mounting space for the liquid crystal display can be reduced
`by an amount corresponding to the absence of the light guide
`panel of the related art.
`
`- 10 -
`
`SONY_000896
`
`

`
`LIQUID CRYSTAL DISPLAY
`11
`11a FIRST GLASS SUBSTRATE
`11B SECOND GLASS SUBSTRATE
`11C LIQUID CRYSTAL
`13
`LIGHT SOURCE
`18
`REFLECTING LAYER
`17
`DIFFUSING LAYER
`
`- 11 -
`
`SONY_000897

This document is available on Docket Alarm but you must sign up to view it.


Or .

Accessing this document will incur an additional charge of $.

After purchase, you can access this document again without charge.

Accept $ Charge
throbber

Still Working On It

This document is taking longer than usual to download. This can happen if we need to contact the court directly to obtain the document and their servers are running slowly.

Give it another minute or two to complete, and then try the refresh button.

throbber

A few More Minutes ... Still Working

It can take up to 5 minutes for us to download a document if the court servers are running slowly.

Thank you for your continued patience.

This document could not be displayed.

We could not find this document within its docket. Please go back to the docket page and check the link. If that does not work, go back to the docket and refresh it to pull the newest information.

Your account does not support viewing this document.

You need a Paid Account to view this document. Click here to change your account type.

Your account does not support viewing this document.

Set your membership status to view this document.

With a Docket Alarm membership, you'll get a whole lot more, including:

  • Up-to-date information for this case.
  • Email alerts whenever there is an update.
  • Full text search for other cases.
  • Get email alerts whenever a new case matches your search.

Become a Member

One Moment Please

The filing “” is large (MB) and is being downloaded.

Please refresh this page in a few minutes to see if the filing has been downloaded. The filing will also be emailed to you when the download completes.

Your document is on its way!

If you do not receive the document in five minutes, contact support at support@docketalarm.com.

Sealed Document

We are unable to display this document, it may be under a court ordered seal.

If you have proper credentials to access the file, you may proceed directly to the court's system using your government issued username and password.


Access Government Site

We are redirecting you
to a mobile optimized page.





Document Unreadable or Corrupt

Refresh this Document
Go to the Docket

We are unable to display this document.

Refresh this Document
Go to the Docket