(19) Japan Patent Office
`
`
`
`(12) Utility ModelUtility Model Publication (U)
`)
`
`(11) Initial Publication(11) Initial Publication
`
`File Number: 1993-45651
`
`(43) Publication Date:(43) Publication Date: 18 June 1993
`
`(51) Int. Cl.5
`G02F 1/1335
`
`Identification Code
`530
`
`Internal Reference Number
`7724-2K
`
`FI
`
`Basis for IPC Application
`
`
`Request for examinationRequest for examination
`
`Number of claims:Number of claims: 1
`
`Not Requested
`(Total 3 pages)
`
`(21) Application Number
`
`(22) Application Date
`
`1991-104603
`
`25 Nov 1991
`
`(71) Applicant
`
`(72) Inventor
`
`
`000101732000101732
`
`Alpine Electronics, Inc.Alpine Electronics, Inc.
`
`8-1-1 NishigotandaNishigotanda
`
`ShinbagawaShinbagawa-ku,
`Tokyo
`
`
`Fumiyasu NiizumaFumiyasu Niizuma
`
`Alpine Electronics, Inc.Alpine Electronics, Inc.
`
`8-1-1 Nishigotanda1 Nishigotanda
`
`ShinbagawaShinbagawa-ku,
`Tokyo
`
`
`
`
`
`________________________________________________________________________________________________________________________________________________________________________________________________________________________
`
`
`
`(54) [Title of the Invention] Liquid Crystal Display Device(54) [Title of the Invention] Liquid Crystal Display Device
`
`(57) [Abstract]
`
`
`[Aim] To provide a liquid crystal display device equipped with a means of illumination that is able to su[Aim] To provide a liquid crystal display device equipped with a means of illumination that is able to su[Aim] To provide a liquid crystal display device equipped with a means of illumination that is able to sufficiently
`
`illuminate an LCD, even a large-scale LCD, without any light and dark irregularities.scale LCD, without any light and dark irregularities.
`
`
`[Structure] The back surface (4c) of a light conductor (4) is provided with a pair of sloped surfaces (4d, 4d)[Structure] The back surface (4c) of a light conductor (4) is provided with a pair of sloped surfaces (4d, 4d)[Structure] The back surface (4c) of a light conductor (4) is provided with a pair of sloped surfaces (4d, 4d)
`
`
`which slope from both ends towards the middle,which slope from both ends towards the middle, and a ridge (4e) is formed where this pair of sloped surfacesnd a ridge (4e) is formed where this pair of sloped surfaces
`
`
`(4d, 4d) intersect. This light conductor (4) is inserted and locked into the recess (5a) of a holder (5), and an(4d, 4d) intersect. This light conductor (4) is inserted and locked into the recess (5a) of a holder (5), and an(4d, 4d) intersect. This light conductor (4) is inserted and locked into the recess (5a) of a holder (5), and an
`
`
`LCD (1) is attached to the front of the light conductor (4). The four corners of tLCD (1) is attached to the front of the light conductor (4). The four corners of the holder 95) are provided withhe holder 95) are provided with
`
`
`extruding pieces (5f), and these extruding pieces (5f) control the movement of the LCD (1) in the direction ofextruding pieces (5f), and these extruding pieces (5f) control the movement of the LCD (1) in the direction ofextruding pieces (5f), and these extruding pieces (5f) control the movement of the LCD (1) in the direction of
`
`
`both ends. In addition, the ridge (4e) of the light conductor (4) is positioned so as not to overlap with the disboth ends. In addition, the ridge (4e) of the light conductor (4) is positioned so as not to overlap with the disboth ends. In addition, the ridge (4e) of the light conductor (4) is positioned so as not to overlap with the display
`
`
`segment (1a) of the LCD (1) when viewed frontsegment (1a) of the LCD (1) when viewed front-on. Light is then guided into the light conductor (4) by lamps (6,on. Light is then guided into the light conductor (4) by lamps (6,
`
`6, …) provided at both ends of the light conductor (4).6, …) provided at both ends of the light conductor (4).
`
`K.J. Pretech Ex. 1007
`
`Pretech_000403
`
`

`
`[Scope of Claims for Utility Model Application]
`[Claim 1]
`A liquid crystal display device featuring a liquid crystal display device equipped with a liquid crystal display
`element with multiple display segments, a light conductor provided on the back surface of the aforementioned
`liquid crystal display element, and light sources to illuminate the aforementioned liquid crystal display element
`via the aforementioned light conductor; where the aforementioned light sources are fixed at either end of the
`aforementioned light conductor, and two sloped surfaces are formed on the back surface of the
`aforementioned light conductor that slope from both ends towards the middle where the aforementioned light
`conductor is the thinnest; and it is also provided with a holder which has locking parts to lock both the
`aforementioned liquid crystal display element and the aforementioned light conductor [in place]; and where the
`ridge formed at the intersection of the pair of sloped surfaces of the aforementioned light conductor is
`positioned so as to not overlap with the display segments of the aforementioned liquid crystal display element
`when viewed front on.
`
`[Brief Description of the Drawings]
`[Figure 1] An exploded view of the liquid crystal display device of the example of the invention.
`[Figure 2] A front view of the liquid crystal display device of the example of the invention.
`[Figure 3] A cross-section at A-A in Figure 2.
`[Figure 4] A front view of the liquid crystal display device of another example of the invention.
`[Figure 5] A summarized cross-section of a conventional liquid crystal display device.
`[Figure 6] A summarized cross-section of a conventional liquid crystal display device.
`
`[Description of the Symbols]
`Liquid Crystal Display Element (LCD)
`Segments
`Light Conductor
`Back Surface
`Sloped Surface
`Ridge
`Holder
`Recess
`Lamp
`Liquid Crystal Display Device
`
`1, 9
`1a, 9a
`4
`4c
`4d
`4e
`5
`5a
`6
`10
`
`Pretech_000404
`
`

`
`Figure 1
`
`Figure 2
`
`Figure 3
`
`
`
`Figure 4Figure 4
`
`Figure 5
`
`
`
`Figure 6Figure 6
`
`Pretech_000405
`
`

`
`[Detailed Description of the Invention]
`[0001]
`[Technical Field of the Invention]
`The invention is related to a liquid crystal display device for use in all types of electronic equipment, and is
`particularly related to the illumination structure within liquid crystal display devices.
`[0002]
`[Prior Art]
`Liquid crystal display devices are widely used in all types of electronic equipment, including the display
`screens of audio equipment, to display the time, radio frequency or other items. These liquid crystal display
`devices are generally composed of liquid crystal display elements (hereinafter referred to as LCD) and a light
`source referred to as a backlight fixed to the back of the LCD. The light from the light source passes through or
`is intercepted by polarizers set inside the LCD and light and dark states are triggered in display pattern
`segments, and numbers, letters and symbols etc. are displayed via the separation of these light and dark
`states.
`
`[0003]
`With the type of liquid crystal display devices described above, it is necessary to uniformly illuminate the
`back of the LCD with the light from the light source to eliminate inconsistent light and dark states on the
`display. To this end, a light conductor (22) comprised of a flat panel of clear resin is attached to the back (21a)
`of the LCD (21) and a lamp (23) is set at one end (22a) of the light conductor (22), as shown in Figure 5. The
`light emitted from this lamp (23) is reflected in a diffused pattern inside the light conductor (22) and dispersed,
`and this reflected light is then guided to the LCD (21) side. However, there exists a problem where the light
`guided to one end (22a) of the light conductor (22) from the lamp leaks to the outside of the light conductor (22)
`during the process of diffuse reflection inside the light conductor (22) as it progresses to the other end (22b)
`and this light is lost, resulting in a darker display from the LCD (21) corresponding to the other end (22b) of the
`light conductor (22).
`[0004]
`Figure 6 shows the means used to solve this problem. It is proposed that the thickness of the light
`conductor (24) is gradually reduced as the distance to the lamp (23) becomes greater, turning the back (24a)
`of the light conductor (24) into a sloped surface (24b). This structure allows the sloped surface (24b) to forcibly
`reflect light that reaches the other end (24c) of the light conductor (24) onto the LCD (21), and is a means of
`guiding a large amount of light to the other end of the LCD (21) when compared with the [example] shown in
`Figure 5 using a flat panel light conductor (22). As such, the problem where the display of the LCD (21)
`corresponding to the other end (24c) of the light conductor (24) becomes darker no longer occurs.
`[0005]
`[Problems to be Solved by the Invention]
`Recent advances in LCD production technology have led to the availability of LCDs of a much larger scale
`than before; however, this necessitates a greatly increased amount of light to illuminate the LCD.
`
`Pretech_000406
`
`

`
`The conventional structure of liquid crystal display devices described above naturally limits the amount of
`light guided to the LCD side by the light conductor as the light conductor is only illuminated at one end, making
`it difficult to obtain the amount of light necessary to illuminate a large-scale LCD.
`The invention was born from this issue, and aims to provide a liquid crystal display device equipped with a
`means of illumination that is able to sufficiently illuminate the LCD, even when mounted onto a large-scale
`LCD.
`
`[0006]
`[Means of Solving the Problems]
`In order to solve the problem disclosed above, the invention is comprised of a liquid crystal display device
`comprising of liquid crystal display elements having multiple display segments, a light conductor set on the
`back of these liquid crystal display elements, and a light source which illuminates the liquid crystal display
`elements through the light conductor, light sources which are fixed at both ends of the light conductor, a pair of
`sloped surfaces that are formed on the back of the light conductor which slope from the two ends towards the
`middle where the light conductor is the thinnest, and a holder having a locking part that is set to lock both the
`aforementioned liquid crystal display elements and the light conductor individually, where the ridge that is
`formed where the pair of sloped surfaces of the aforementioned light conductor intersect is positioned where it
`will not overlap with liquid crystal display element display segments when viewed straight-on.
`[0007]
`[Operation]
`With the means disclosed above, having light sources which are fixed at both ends of the light conductor
`and a pair of sloped surfaces that are formed on the back of the light conductor which slope from the two ends
`towards the middle where the light conductor is the thinnest means that light can be guided from both ends of
`the light conductor, and that the light guided into the light conductor can be forcibly led to each liquid crystal
`display element by the pair of sloped surfaces, greatly increasing the amount of light led to the liquid crystal
`display elements when compared to existing means of guiding light from only one end of the light conductor,
`and making it possible to sufficiently illuminate the liquid crystal display elements even when mounted onto a
`large-scale liquid crystal display element.
`[0008]
`In addition, by setting a holder having a locking part to lock both the aforementioned liquid crystal display
`elements and the light conductor individually, and by positioning the ridge formed where the pair of sloped
`surfaces of the aforementioned light conductor intersect where it will not overlap with liquid crystal display
`element display segments when viewed straight-on, it is possible to prevent light and dark irregularities on the
`display caused by a shift of the relative positions of the liquid crystal display elements and the light conductor
`due to vibration etc. that results in the liquid crystal display element display segments overlapping with the
`ridge of the light conductor. In addition, even if the brightness of the light sources at each end differ, brightness
`irregularities in single display segments are prevented as each display segment is only illuminated by the light
`from one light source. Furthermore, the locking part of the holder fixes both the liquid crystal display and the
`light conductor in place, increasing the assembly performance of the device.
`[0009]
`
`Pretech_000407
`
`

`
`[Examples]
`Below is a detailed description of an example of the invention with reference to the figures.
`Figures 1 through 3 show the liquid crystal display device of Example 1 of the invention. Figure 1 is an
`exploded view, Figure 2 is a front view, and Figure 3 is a cross-section at A-A in Figure 2.
`[0010]
`The (1) in these figures refers to an LCD where liquid crystals are sealed inside a rectangular clear
`substrate. While it is not specifically shown, numbers, letters and symbols are displayed when the dark display
`pattern segments (1a, 1a, …) on the back of this LCD (1) become bright, meaning that it is a negative LCD. A
`color filter (2) formed from a film of compound resin is affixed to the back of the LCD (1). In addition, a light
`diffusing film (3) formed from a thin panel of white or milk-colored translucent compound resin is set on the
`back of
`the color filter (2). This light diffusing film (3) is formed into roughly the same shape as the
`abovementioned LCD (1) and color filter (2).
`[0011]
`A light conductor (4) made from a transparent compound resin such as acrylic is fixed to the back of the
`LCD (1) via this light diffusing film (3) and the abovementioned color filter (2). Figure 1 shows that U-shaped
`grooves (4a, 4a) are set into both ends of the light conductor (4) and that a V-shaped notch (4b) is set
`positioned in between these grooves (4a, 4b). In addition, a pair of sloped surfaces (4d, 4d) are set into the
`back surface (4c) of the light conductor (4) curved and sloping from both ends towards the middle where the
`light conductor (4) is the thinnest, and a ridge (4e) is formed where this pair of sloped surfaces (4d, 4d)
`intersect. Furthermore, although it is not shown in the Figure, finely serrated or ridged grooves cover the
`entirety of the back surface (4c) of the light conductor (4).
`[0012]
`The (5) in this figure refers to a holder formed from white compound resin in a rough box shape. The inside
`of this holder (5) is formed into a recess (locking part) (5a) that is shaped to approximately match the outer
`shape of the abovementioned light conductor, and the light conductor (4) is fixed in place by being inserted and
`locked into this recess (5a). In addition, grooves (5c, 5c) corresponding to the grooves (4a, 4a) on the light
`conductor (4) are set at both ends on the back surface (5b) of the holder (5), and there is also a notch (5d)
`corresponding to the notch (4b) of the light conductor (4).
`[0013]
`Furthermore, a pair of sloped parts (5e, 5e) are formed on the back surface (5b) of the holder (5) curving
`towards the interior of the holder (5) with the same radius of curvature as the pair of sloped surfaces (4d, 4d) of
`the light conductor (4), so that when the light conductor (4) is inserted into the recess (5a) of the holder (5) the
`back surface (4c) of the light conductor (4) and the back surface (5b) of the holder (5) are completely flush
`against each other.
`In addition, extruding pieces (locking parts) (5f) protrude from each of the four corners of the inside of the
`holder (5). The clearance interval between either end of the extruding pieces (5f, 5f, …) (at the left and right of
`the figure) roughly matches the interval of the width along the length of the abovementioned LCD (1).
`[0014]
`
`Pretech_000408
`
`

`
`A printed circuit board (7) equipped with multiple lamps (6, 6) on its front surface (7a) comprising of, for
`example, LEDs is fixed to the back of the abovementioned holder (5). The lamps (6, 6, …) are fixed in position
`so that the clearance interval between them is equal to that between the grooves (5b, 5b, …) on the holder (5)
`and the grooves (4a, 4a, …) on the light conductor (4). In addition, latching holes (7b, 7b) are set into the
`printed circuit board (7) so that when frame (8) (which will be described below) is attached, the latching pieces
`(8b, 8b) of the frame (8) will be inserted into them.
`[0015]
`The (8) in this figure refers to a frame formed in a frame shape from a metal with good heat conductivity.
`This frame (8) is slightly larger than the exterior of the abovementioned holder (5) and an opening (8a)
`somewhat smaller than the abovementioned LCD (1) is formed on its front. In addition, multiple latching pieces
`(8b, 8b, …) that fit into the latching holes (7b, 7b, …) on the printed circuit board (7) described above, protrude
`from the perimeter of the back of the frame (8).
`[0016]
`The following is a description of the assembly process for a liquid crystal display device comprising of the
`abovementioned structure.
`First, insert the back surface (4c) of the light conductor (4) into the recess (5a) of the holder (5); this causes
`the front surface (7a) of the printed circuit board (7) to become flush against the holder (5). When this happens,
`if the lamps (6, 6, …) set into the printed circuit board (7) are inserted into the grooves (5c, 5c, …) at both ends
`of the holder (5), the holder will naturally lock them into position and the lamps (6, 6, …) will be fitted into the
`grooves (4a, 4a, …) on the light conductor (4).
`[0017]
`Then the front of the light conductor (4) is fitted to the LCD (1), which has the light diffusing film (3) and the
`color filter (2) attached. When this happens, both end parts of the LCD (1) are locked by the extruding pieces
`(5f, 5f, …) of the holder (5), as shown in Figure 3, and its movement in the direction of both ends (to the left and
`right of the diagram) is controlled. This allows the positions of the light conductor (4) and the LCD (1) to both be
`controlled by a single holder (5), making assembly easy and ensuring that there will be no change in the
`relative positions of both ends of the LCD (1) and the light conductor (4). As such, if the segments (1a, 1a, …)
`of the LCD (1) and the ridge (4e) formed on the back surface (4c) of the light conductor (4) are set in a position
`where they will not overlap when viewed front-on, as shown in Figure 2, the ridge (4e) of the light conductor (4)
`and the segments (1a, 1a, …) of the LCD (1) in front of it will never overlap, even when subjected to external
`shocks.
`
`[0018]
`Without changing anything, the frame (8) is fitted to the outer perimeter of the holder (5) and attached to
`the printed circuit board (7). The frame (8) is fixed to the printed circuit board (7) by the insertion of its latching
`pieces (8b, 8b, …) through the latching holes (7b, 7b, …) on the printed circuit board (7) and the bending of its
`latching pieces (8b, 8b, …) at the back of the printed circuit board (7). Furthermore, once the frame (8) is
`attached, it is fine to push the front of the LCD (1) against the inside of front of the frame (8) so that the holder
`(5) and the LCD (1) etc. do not rattle, between the front surface (7a) of the printed circuit board (7) and the front
`of the frame (8), by, for example, inserting a flexible entity such as a rubber plate between the back surface
`
`Pretech_000409
`
`

`
`(5b) of the holder (5) and the front surface (7a) of the printed circuit board (7). Furthermore, the close contact
`between the edges of the frame (8) and the lamps (6, 6, …) shown in Figure 6 efficiently disperse the heat
`produced by the lit lamps (6, 6, …) via the frame (8).
`[0019]
`With the abovementioned liquid crystal display device (10), the light emitted from the lamps (6, 6, …) is
`guided into the light conductor (4) from the grooves (4a, 4a) at both ends of the light conductor (4) and
`undergoes diffuse reflection due to the notch (4b) set into the light conductor (4) and other sides, and then is
`reflected out towards the LCD (1) via the serrated or ridged grooves (not shown) formed on the back surface
`(4c) of the light conductor (4). When this happens there is a reduction in the amount of light from the lamps (6,
`6, …) reaching the sections furthest away from the lamps (6, 6, …), i.e. the middle part of the light conductor
`(4); however, the sloped surfaces (4d, 4d) set towards the middle of the back surface (4c) of the light conductor
`(4) forcibly reflect the light towards the LCD (1), preventing the LCD (1) segments (1a, 1a, …) positioned close
`to the middle part from becoming dark.
`[0020]
`Furthermore, in this Example, because the holder (5) in which the light conductor (4) is inserted is formed
`from a white compound resin and is flush against the light conductor (4), it is able to reflect light leaked from
`the light conductor (4) to the holder (5) back into the light conductor (4), making it possible to reduce the
`attenuation of light emitted from the lamps (6, 6, …) and to efficiently illuminate the LCD (1).
`[0021]
`In addition, the light from the lamps (6, 6, …) gathers at the ridge (4e) part formed at the section where the
`sloped surfaces (4d, 4d) of the light conductor (4) intersect, creating a linear shining section running along this
`ridge (4e) when viewed from the front of the LCD (1) (when viewed front-on). However, the ridge (4e) has
`already been positioned so as not to overlap with the segments (1a, 1a, …) of the LCD (1) and the holder (5)
`locks the LCD (1) and light conductor (4) so that their relative positions will not change, preventing light and
`dark irregularities where only a specific section of the display becomes brighter than the others due to the
`overlapping of the front of the ridge (4e) with the LCD (1) segments (1a, 1a, …). Furthermore, even if there was
`disparity in the brightness of the lamps (6, 6, …) on both ends of the light conductor (4) themselves, each
`segment (1a) of the LCD (1) is only illuminated by light from one of the lamps (6, 6), preventing brightness
`irregularities within a single segment (1a).
`[0022]
`Furthermore, the Example used a negative LCD (1) so the light from the light conductor (4) in sections
`other than the segments (1a, 1a, …) is intercepted. As such, light and dark irregularities will not occur outside
`of the display sections if the ridge (4e) of the light conductor (4) is positioned in a section away from the
`segments (1a, 1a, …), e.g. between the letters as shown in Figure 2.
`[0023]
`The light guided to the LCD (1) from the light conductor (4) reaches the LCD (1) after being sufficiently
`diffused by the light diffusion film (3) and colored by the color filter (2). This light then passes through or is
`intercepted by the polarizers (not shown) set inside the LCD (1) and the desired segments (1a, 1a, …) are
`illuminated, resulting in the display of letters and numbers etc.
`
`Pretech_000410
`
`

`
`[0024]
`Furthermore, in this Example extruding pieces (5f, 5f, …) are formed on the front of the holder (5) as
`locking parts to control the movement of the LCD (1) in the direction of both ends, but it is not absolutely
`necessary that these locking parts must be separately formed and any method that is able to prevent changes
`in the relative position of the LCD (1) and the light conductor (4) is fine. For example, it would be fine to insert
`the LCD (1) and the light conductor (4) into a single recess (5a) of the holder (5) together.
`[0025]
`In addition, while this Example describes a liquid crystal display device (10) that uses an LCD (1) with
`linear segments (1a, 1a, …), naturally the same advantages can be obtained when using the invention with a
`liquid crystal display device that uses a dot matrix LCD (9) where the segments (9a, 9a, …) are dot-shaped, as
`shown in Figure 4.
`[0026]
`[Advantages of the Invention]
`As described above, by fixing light sources at either end of the light conductor and setting a pair of sloped
`surfaces into the back surface of the light conductor that slope from both ends towards the middle where the
`light conductor is thinnest, the invention is able to guide light into the light conductor from both ends and this
`light that has been guided inside the light conductor can be forcibly led to each of the liquid crystal display
`elements by the pair of sloped surfaces, greatly increasing the amount of light guided towards the liquid crystal
`display elements and making it possible to sufficiently illuminate these liquid crystal display elements even
`when mounted onto a large-scale liquid crystal display element.
`[0027]
`In addition, by providing a holder having locking parts to lock both the liquid crystal display elements and
`the light conductor, and by positioning the ridge formed at the intersection of the pair of sloped surfaces of the
`light conductor in a location where it does not overlap with any liquid crystal display element display segment
`when viewed front-on, it is possible to prevent light and dark irregularities occurring in the display where
`vibration etc. has caused a shift in the relative positions of the liquid crystal display elements and the light
`conductor, causing the display segments of the liquid crystal display elements to overlap with the ridge of the
`light conductor and resulting in the display segments corresponding to the ridge of the light conductor
`becoming brighter. In addition, even if the brightness of the light sources at each end differ, brightness
`irregularities in single display segments are prevented as each display segment is only illuminated by the light
`from one light source. Furthermore, the locking part of the holder fixes both the liquid crystal display and the
`light conductor in place, increasing the assembly performance of the device.
`
`Pretech_000411
`
`

`
`703 892 4510
`
`Landon IP, Inc.
`Legal and Technical Translation Services
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`Phone:
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`AFFIDAVIT OF TRANSLATION ACCURACY
`
`I, Natasha Lutes , hereby declare under penalty of perjury as follows:
`
`1.
`
`I am fluent in both English and Japanese languages, and l have experience translating patent
`
`documents between the two languages.
`
`2.
`
`I am the translator of the attached English language translation of attached patent no.
`
`JPH545651(U), entitled ”[Liquid Crystal Display Device],“ published on [18 June 1993].
`
`3.
`
`I certify that the attached English translation, to the best of my knowledge and belief, is a true
`
`and accurate translation.
`
`4.
`
`I declare that all statements made herein of my own knowledge are true and that all
`
`statements made on information and belief are believed to be true; and further that these statements were
`
`made with the knowledge that willful false statements and the like are punishable by fine or imprisonment, or
`
`both, under Section 1001 of Title 18 of the United States Code.
`
`Dated this 3rd day of A ril
`
`2015 ,
`
`Signature of Translator:
`
`j 1 £
`
`Landon IP, Inc. endeavors to ensure the accuracy of each translation. However, Landon IP will in no event be liable for any incidental or consequential
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`damages whatsoever, whether from claims of breach of warranty, negligence, strict liability or otherwise arising out of the work, and our liability under
`no circumstances will exceed the price paid for the translation for which liability is claimed.
`
`Translation Certification - Rev. 1015-01
`
`Pretech_000412
`
`Pretech_000412
`
`

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