`
`
`
`C E R T I F I C A T I O N O F T R A N S L A T I O N
`
`
`
`
`The undersigned, Richard Patner, whose address is 26357 Lexington Drive,
`
`Bonita Springs, FL 34135, United States of America, declares and states as follows:
`
`I am well acquainted with the English and Japanese languages; I have in the
`
`past translated numerous Japanese documents of legal and/or technical content into
`
`English.
`
`I have been requested to translate into English the attached Japanese
`Patent No. 3-5725 titled “Backlighting device.”
`
`
`To a copy of this Japanese document I therefore attach an English translation
`
`and my Certification of Translation.
`
`I hereby certify that the attached English translation of Japanese Patent No. 3-
`
`5725 titled “Backlighting device” is, to the best of my knowledge and ability, an
`
`accurate translation.
`
`And I declare further that all statements made herein of my own knowledge are
`
`true, that all statements made on information and belief are believed to be true, and that
`
`false statements and the like are punishable by fine and imprisonment, or both, under
`
`Section 1001 of Title 18 of the United States Code.
`
`
`
`
`
`
`__ _________ ______February 23, 2015_____________
`Date
`Richard Patner
`
`
`
`
`
`
`TOYOTA EXHIBIT 1003
`
`Page 1 of 10
`
`

`

`19 THE PATENT OFFICE OF JAPAN (JP)
`
`12 OFFICIAL GAZETTE FOR UNEXAMINED PATENTS (A)
`
`11 Disclosure Number 3-5725
`
`51 Int. Cl5
`
`
`Identification
`Symbols
`
`Intra-Agency File
` Nos.
`
` G
`
`
`72 Inventors
`
`
`71 Applicant
`
`
`71 Applicant
`
`
`74 Agent
`
`
`MIZOBE Tatsuji
`58-3 3-chome, Kamedo, Edo-ku, Tokyo-to
`Yonmarugo K.K.
`
`
`Mitsubishi Petrochemical Co., Ltd.
`5-2 2-chome, Marunouchi, Chiyoda-ku, Tokyo-to
`
`
`Yonmarugo K.K.
`58-3 3-chome, Kamedo, Edo-ku, Tokyo-to
`
`Attorney ISONO Michizo
`and one other
`
` 02 F 1/1355
`F 21 S 1/00
`F 21 V 8/00
`G 09 F 9/00
`
`
`43 Date of publication of application
`January 11, 1991
` 1
` Number of Claims
`Not yet requested
` Request for Examination
`(total 4 pages)
`
`________________________________________________________________________________
`
`54 Title Backlighting device
`
`21 Application Number
`
`22 Filing Date
`
`72 Inventors
`
`
`
`
`
`
`
`530
` E
` D
`332 B
`336 J
`
`8106-2H
`6649-3K
`2113-3K
`6422-5C
`6422-5C
`
`1-140318
`
`June 2, 1989
`
`
`MUKASA Yoshinao
`1 Tohocho, Yokkaiichi-shi, Mie-ken
`Mitsubishi Petrochemical Co., Ltd., Electronic Component Development Center
`
`Page 2 of 10
`
`

`

`
`
`1. Title of Invention
`
`Backlighting device
`
`2. Scope of Patent Claim
`
` A
`
`Specification
`
` backlighting device characterized by the disposition of a light source in at least one of four edges of a transparent
`substrate, by the formation of light reflecting layers on the back surface of a transparent substrate in a pattern of
`higher density as a function of distance from the light source, and by the installation of a light diffusion member
`comprising fine unevenness on the front surface of a transparent substrate.
`
`3. Detailed Description of the Invention
`[Field of Industrial Utilization]
`
`The present invention relates to a liquid crystal display (LCD) backlighting device, specifically to a thin, light-weight
`backlighting device with outstanding uniformity of luminance even over a large area.
`
`[Prior Art]
`
`The utilization of liquid crystal displays in various products as a flat panel display that can adequately bring forth its
`outstanding features of thinness, light weight, low power consumption, etc., is anticipated. However, current liquid
`crystal displays are inferior to CRTs (cathode ray tube) that are used extensively for both industrial and consumer
`displays in terms of the image quality. Consequently, backlit liquid crystal displays that improve the picture quality
`are under development.
`
`This type of backlighting device requires uniform luminance at every part of the surface to be irradiated, and
`numerous inventions have been proposed concerning the uniformity of this luminance. For example, the
`backlighting device presented in the gazette of Japanese Kokai Publication Sho-57-13478 has a milky-white
`dispersion member mounted over a linear light source so as to be thicker in the center and to become thinner toward
`the edges. This attempts to attain even illumination, thinness and size reduction. Illumination unevenness is
`eliminated in the backlighting device stated in the gazette of Japanese Kokai Publication Sho-60-264039 through the
`use of a helical cold cathode fluorescent tube; in the backlighting device stated in the gazette of Japanese Kokai
`Publication Sho-61-219980 through the use of an ultraviolet lamp with a fluorescent coated layer about the periphery
`of said ultraviolet lamp; in the backlighting device stated in the gazette of Japanese Kokai Publication Sho-62-10621
`via a light source incorporated in the light-guide plate; in the backlighting device stated in the gazette of Japanese
`Kokai Publication Sho-62-127717 via uneven lenses installed above and below a plurality of light sources, and in the
`backlighting device stated in the gazette of Japanese Kokai Publication Sho-63-125975 via a U-shaped lamp.
`
`[Problems Solved by the Invention]
`
`The aforementioned conventional backlighting devices are associated with the following problems.
`
`(1) The thickness is considerable because a light source is installed below the light dispersion member.
`
`(2) When a plurality of lamps is installed to make the luminance more uniform, the number of lamps must be
`increased as the area is increased and that raises the cost.
`
`(3) The use of a helical lamp poses the difficulties of need for a larger area and absence of mass productivity.
`
`
`Page 3 of 10
`
`

`

`Thus, the objective of the present invention is to provide a backlighting device to resolve the aforementioned defects
`of conventional technology that is ideal for mass production in which uniform luminance even over a large area is
`realized in a unit that is thin and light weight.
`
`[Means of Solving the Problems]
`
`The present invention was devised to attain the aforementioned objectives. It provides a backlighting device
`characterized by the disposition of a light source in at least one of four edges of a transparent substrate, by the
`formation of light reflecting layers on the back surface of a transparent substrate in a pattern of higher density as a
`function of distance from the light source, and by the installation of a light diffusion member comprising fine
`unevenness on the front surface of a transparent substrate.
`
`[Action]
`
`The present invention with the aforementioned structure has illuminating light from a light source incident internally
`from the edges of a transparent substrate. The majority of the light incident within the transparent substrate advances
`while reflecting within the transparent substrate because of the difference in optical density at the interface of the
`transparent substrate and air. When the light that is incident during this advance reaches the light reflecting layers, it
`is reflected off said light reflecting layers so as to fall below the so-called critical angle relative to the interface of the
`transparent substrate and air. As a result, it is emitted externally from the surface of the transparent substrate. The
`light reflecting layers are formed in patterns of higher density with greater distance from the light source.
`Consequently, a weakened amount of light is corrected as the distance from the light source increases so that a
`uniform amount of light is corrected at the front of the transparent substrate. The light that is emitted from the
`transparent substrate eliminates emission unevenness in accordance with the pattern of the aforementioned light
`reflecting layers, resulting in the derivation of backlight with a uniform luminance distribution.
`
`[Embodiments]
`
`An embodiment of the backlighting device pursuant to the present invention is explained below based on diagrams.
`Figure 1 and Figure 2 illustrate one embodiment of the backlighting device pursuant to the present invention with
`liquid crystal displays (LCD) installed in the rear. In the figure, 1 represents the transparent substrate. The
`transparent substrate 1 is a thin plate of material that has good transmissivity. The material may be glass plate,
`acrylic resin plate, or polycarbonate resin plate for example, transparent plate of inorganic material or synthetic resin.
` A light source 2 is disposed at one location on the periphery of the transparent substrate 1. The light source 2 may
`be a common fluorescent light or a narrow-diameter cold cathode fluorescent tube that allow the overall backlighting
`device to be thin and that inhibit the effects of temperature on the liquid crystal display (LCD) panel. In addition, the
`light source 2 may be a simple aperture lamp. Light reflecting layer 3 that scatters light emitted from the light source
`2 is described on the back of the aforementioned transparent substrate 1 by a pattern of higher density that is
`proportional to the distance from the light source 2. The light reflecting layer 3 uses volatile curing ink that contains
`fine reflective particles of titanium oxide, etc. or ultraviolet curing white ink, or color ink may be used to suit the
`individual user. Methods of forming the light reflecting layer 3 on the back of the transparent substrate 1 are
`described using screen printing or other known techniques. When forming said light reflecting layer 3 on the back of
`the transparent substrate 1, as shown in Figure 2, the number of points per unit area would be set at a constant and
`the points (dots) would be described as enlarging proportional to increasing distance from the light source so that the
`occupation rate of light reflecting layer 3 per unit area of 1 would change. The diameter of the dots of the light
`reflecting layer 3 should be set at 1 to 3000 μ, preferably 10 to 1000 μ. A light diffusion member that is installed on
`the front of the aforementioned transparent substrate 1 may be a light diffusion sheet 4 that is bonded to the front of
`the transparent substrate 1 or it may be directly formed on the front of the transparent substrate 1. The light diffusion
`sheet 4 has ground glass, plastic film with a cockle finish, or plastic film with fine filler such as silica or glass bonded
`thereto. Plastic film that has a light diffusion member as noted above formed thereupon would be ideal in terms of
`cost and durability. Fine unevenness can be formed on the surface via sandblasting or cockle finishing when directly
`forming a light diffusion member on the surface of the aforementioned transparent substrate 1. The transparent
`
`Page 4 of 10
`
`

`

`substrate 1 described by the aforementioned light reflecting layer 3, the light source 2 and the light diffusion sheet 4
`are enclosed by the housing 5, excluding the front surface. The housing 5 has the function of returning light that had
`leaked from the transparent substrate 1 or the light source 2 to the transparent substrate 1, the function of blocking
`the leakage of light from the unit other than from the front, and the heat dissipation function involving the external
`diffusion of heat generated from the light source. Consequently, it is made of plastic or metal whose inner surface
`had been subjected to treatment to provide high reflectance. For example, the housing 5 ideally would be an
`aluminum case subjected to vapor deposition of metal with high reflectance or an aluminum case coated with white
`paint that has high optical reflectance. In addition, reflective tape 6 may be affixed to edges of the aforementioned
`transparent substrate 1 other than the edge into which is incident light from the light source 2 to block the leakage of
`light from the edges of the transparent substrate 1.
`
`Light emitted from the light source 2 is incident from the edge of the transparent substrate 1 in the aforementioned
`backlighting device of the first embodiment, and it advances within the transparent substrate 1 after repeating
`reflection that is dependent on the incident angle at the interface of the transparent substrate 1 and air.
`Accompanying this advance, the incident light that reaches the light reflecting layer 3 undergoes diffusion reflection
`by fine reflecting particles that had been incorporated such as titanium oxide upon incidence within said light
`reflecting layer 3, and it is emitted from the surface of said transparent substrate 1 at less than the critical angle
`relative to the interface of the transparent substrate 1 and air. A uniform diffusion reflection quantity of light can be
`derived over the entire front from the vicinity of the light source 2 having a high quantity of light to distant sites that
`have a low quantity of light since the occupation rate of the light reflecting layer 3 per unit area of the transparent
`substrate 1 increases with separation from the light source 2. Light that leaks from the transparent substrate 1,
`specifically light that leaks from the pattern spaces of the light reflecting layer 3, is returned to within the transparent
`substrate 1 following reflection off the inner surface of the housing 5 and is emitted from the front of the transparent
`substrate 1 while repeating reflection within the transparent substrate 1. Said emitted light is diffused within the light
`diffusion member that is directly attached to the front of the transparent substrate 1 or the light diffusion sheet 4. By
`so doing, changes in the quantity of light between the aforementioned light reflecting layer 3 and the pattern
`separation of the light reflecting layer 3 is eliminated and uniform luminance is derived. On the other hand, heat
`generated from the light source 2 is released externally through the housing 5.
`
`Figures 3 and 4 illustrate a second embodiment of the backlighting device pursuant to the present invention. Two
`light sources 2a, 2b are disposed on the left and right edges of the transparent substrate 1. Furthermore, a light
`reflecting layer 7 is formed on the back of the transparent substrate 1 in which the number of dots per unit area of
`transparent substrate 1 increases with increasing separation from the light sources 2a, 2b without alteration of the dot
`diameter. As a result, the light reflecting layer 7 has the highest density midway between the light sources 2a, 2b,
`and the density decreases as the light sources 2a, 2b are approached. The light reflecting layer 7 uses the same
`structure as that of the light reflecting layer 3 in the aforementioned first embodiment. Reflection sheet 8 is bonded
`to the back of transparent substrate 1 on which the light reflecting layer 7 is formed. This reflection sheet 8 may be
`glass, of course, as well as plastic film to which metal with high reflectance had been deposited. Each light source
`2a, 2b is enclosed by a lamp housing 9. The lamp housing 9 ideally would be an aluminum case subjected to the
`same high reflectance treatment on the inner surface as the housing 5 of the aforementioned first embodiment. It
`otherwise is identical which the aforementioned first embodiment.
`
`Similarly to the aforementioned first embodiment, light emitted from the light sources 2a, 2b is incident into the
`transparent substrate 1 from both the left and right edges and advances while repeatedly reflected in the backlighting
`device of the second embodiment. Once the light reflecting layer 7 is reached, it undergoes diffusion reflection and
`is released externally from the transparent substrate 1 via the light diffusion sheet 4. Light emitted with uniform
`luminance over the front surface is derived, similarly to the aforementioned first embodiment, since the light
`reflecting layer 7 is formed with higher density at greater separation from the light sources 2a, 2b. The light that
`passed through the pattern separation of the light reflecting layer 7 is reflected off the reflection sheet 8 and is
`returned to the transparent substrate 1 similarly to the first embodiment.
`
`
`Page 5 of 10
`
`

`

`Both the diameter of the dots as well as the number of dots per unit area may be altered proportionally to the distance
`from the light source in the aforementioned light reflecting layers of the first and second embodiments of the present
`invention, but the present invention is not restricted to dots. Lines may be used as well, and the thickness of the lines
`as well as their mutual separations may be altered.
`
`[Effects of Invention]
`
`As noted above, the overall thickness of the backlighting device is determined by the thickness of the transparent
`substrate including the diameter of the light source, by the light diffusion sheet, by the clearance when these are
`bonded and by the thickness of members such as the housing as required since a light source is disposed at the edge
`rather than in the thickness direction of a transparent substrate in the backlighting device pursuant to the present
`invention. Furthermore, the luminance has outstanding uniformity and the present invention is thus capable of
`providing a backlighting device capable of thin size, light weight and outstanding, uniform luminance over a large
`area that had been hitherto impossible with conventional technology. As indicated above, the backlighting device
`pursuant to the present invention is capable of presenting an area that is easy to read without unevenness in the
`luminance in a thin package through the incorporation of liquid crystal (LCD) display. It can contribute considerably
`to enhancement of the liquid crystal (LCD) display function, and it can be used in various other types of backlighting
`devices as well.
`
`4. Brief Description of Drawings
`
`Figure 1 is a structural diagram illustrating a first embodiment of the backlighting device pursuant to the present
`invention. Figure 2 is an explanatory diagram illustrating the formation of a light reflecting layer viewed from the
`back of the transparent substrate of Figure 1. Figure 3 is a structural diagram illustrating a second embodiment of
`the backlighting device pursuant to the present invention. Figure 4 is an explanatory diagram illustrating the
`formation of a light reflecting layer viewed from the back of the transparent substrate of Figure 3.
`
`1.. transparent substrate, 2, 2a, 2b.. light source
`3, 7.. light reflecting layer, 4.. light diffusion sheet
`
`Patent Applicant Mitsubishi Petrochemical Co., Ltd.
`Yonmarugo K.K.
`
`
`Agent Attorney ISONO Michizo
`
`
`
`Page 6 of 10
`
`

`

`®Int. Cl. s
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