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1. 发明专利

JP2002107716A LIQUID CRYSTAL DISPLAY DEVICE 失效
公开(公告)号：JP2002107716A
公开(公告)日：2002-04-10
申请号：JP2000254964
申请日：2000-08-25
申请人： HITACHI LTD , HITACHI ELECTRONIC DEVICES CO
发明人： KAWADA TOMOAKI , TEZUKA AKIO , HIRAYAMA TOSHIO , MIYAWAKI TOSHITSUGU , NATORI MASATAKA
IPC分类号： G02B6/00 , F21V8/00 , F21Y103/00 , G02F1/1335 , G02F1/13357 , G09F9/00
摘要： PROBLEM TO BE SOLVED: To improve the use efficiency of light by resolving the unevenness of luminance on a picture accompanying the frame narrowing of a liquid crystal display device. SOLUTION: A light emission control pattern THR, consisting of plural grooves the extension directions of which are inclined to a side (light incidence face) where a linear lamp LP of a light transmission plate GLB is set, is provided on the surface of a corner part of the side. The light emission control pattern THR is obtained by forming these grooves in the corner part on the light incidence face of a stamper balanced in the face by a method like cutting.

2. 发明专利

JP2000314882A LIQUID CRYSTAL DISPLAY DEVICE, LIGHT GUIDING PLATE AND MANUFACTURE OF LIGHT GUIDING PLATE 失效
公开(公告)号：JP2000314882A
公开(公告)日：2000-11-14
申请号：JP12441199
申请日：1999-04-30
申请人： HITACHI LTD , HITACHI ELECTRONIC DEVICES CO , NITTO DENKO CORP
发明人： HIYOSHI YASUO , TANIGUCHI HITOSHI , MIYAWAKI TOSHITSUGU , YANO SHUJI
IPC分类号： G09F9/00 , F21V8/00 , G02B6/00 , G02F1/1335 , G02F1/13357
摘要： PROBLEM TO BE SOLVED: To provide a light guiding plate which improves brightness of a backlight or a frontlight without heightening brightness of a light source, and a liquid crystal display device utilizing the same. SOLUTION: The light guiding plate comprises many dotted small recessed parts 9 for reflecting incident light from a light source 1 in the direction of a light emitting plane formed on the surface of the light guiding plate 2 opposite to the plane 16 which emits light to a liquid crystal cell. The sectional shape of the dotted small recessed part 9 is made triangular and, at the same time, its sectionally inclined angle is made to be 50-60 deg., and besides the planar shape of the dotted small recessed part 9, seen from a direction vertical to the plane of the light guiding plate, is made to be nearly rectangular or square, and simultaneously a longer side of the nearly rectangular shape or a side of the nearly square shape is arranged almost parallel with the longitudinal direction of the light source.

3. 发明专利

JP2000171641A BACK LIGHT DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE AS WELL AS PRODUCTION OF LIGHT TRANSMISSION PLATE 失效
公开(公告)号：JP2000171641A
公开(公告)日：2000-06-23
申请号：JP35058998
申请日：1998-12-10
申请人： HITACHI LTD , HITACHI ELECTRONIC DEVICES CO , NITTO DENKO CORP
发明人： HIYOSHI YASUO , TANIGUCHI HITOSHI , MIYAWAKI TOSHITSUGU , YANO SHUJI
IPC分类号： G02B6/00 , F21V8/00 , G02F1/1335 , G02F1/13357
摘要： PROBLEM TO BE SOLVED: To provide a back light device which makes it possible to improve light utilization efficiency and to obtain a large-sized back light having high luminance and a liquid crystal display device as well as a process for producing a light transmission plate. SOLUTION: The back light device and liquid crystal display device have a pair of light sources 1 and 1' which emit fine belt-like luminous fluxes, two sheets of light transmission plates 2 and 2' which have incident surfaces to allow the incidence of the fine belt-like luminous fluxes from each of the light sources 1 and 1', light transparent surfaces for emitting the guided light and base surfaces corresponding to these light transparent surfaces and are formed with plural microrods for reflecting or scattering the guided light progressing deep in the direction of the transparent surfaces by repeating the reflection of the incident light from the incident surfaces at the base surfaces and the light transparent surfaces at least on the base surfaces so as to increase the density thereof with a deeper progression from the incident surfaces and a refractive index member 7 which is installed to face the base surface of these light transmission plates 2 and 2'.

4. 发明专利

JP2000131690A LIGHT TRANSMISSION PLATE AND LIQUID CRYSTAL DISPLAY DEVICE USING IT 失效
公开(公告)号：JP2000131690A
公开(公告)日：2000-05-12
申请号：JP30664298
申请日：1998-10-28
申请人： HITACHI LTD , HITACHI ELECTRONIC DEVICES CO , NITTO DENKO CORP
发明人： TANIGUCHI HITOSHI , HIYOSHI YASUO , MIYAWAKI TOSHITSUGU , YANO SHUJI
IPC分类号： G09F9/35 , G02F1/1335 , G02F1/13357
摘要： PROBLEM TO BE SOLVED: To improve a control property of light, to reduce an optical loss and to improve luminance without increasing the luminance of a light source in a light transmission plate of a rear illumination part used for a liquid crystal display device. SOLUTION: Dots 10 consisting of plural partial nearly columns are formed for changing the light from the light transmission plate 2 incident surface to a prescribed angle in the transmission surface direction, and the total value of the whole dots of the area of the dots 10 is made so as to exist within the range of 4 to 12% of the area of the light transmission plate 2 lower surface (dot forming surface 3) of the light transmission plate 2. Further, the arrangement, the sectional tilt angle are provided properly. Thus, a display element is irradiated by the illumination light having a proper angular distribution from a light emission surface.

5. 发明专利

JPH11311778A LIQUID CRYSTAL DISPLAY DEVICE 失效
公开(公告)号：JPH11311778A
公开(公告)日：1999-11-09
申请号：JP8548498
申请日：1998-03-31
申请人： HITACHI LTD , HITACHI ELECTRONIC DEVICES CO
发明人： TANIGUCHI HITOSHI , HIYOSHI YASUO , MORI YUJI , HIRAYAMA TOSHIO , MIYAWAKI TOSHITSUGU
IPC分类号： G09F9/35 , G02B6/00 , G02F1/133 , G02F1/1335 , G02F1/13357 , G09F9/00
摘要： PROBLEM TO BE SOLVED: To provide a liquid crystal display device with high luminance. SOLUTION: This display device is enabled to irradiate a display element with illumination light having a proper angle distribution from a light-emitting surface by forming dots consisting of small recessed parts for varying the light from a light transmission plate incidence surface to a specific angle to a light transmission surface direction on a light transmission plate 2 and properly controlling the arrangement, size, and sectional tilt angle of the dots. Further, a diffusion sheet, a cholesteric liquid crystal film, and a 1/4-phase plate can be combined when necessary.

6. 发明专利

JP2000347185A LIQUID CRYSTAL DISPLAY DEVICE AND PRODUCTION OF LIGHT GUIDE PLATE WHICH CONSTITUTE BACK LIGHT OF DISPLAY DEVICE 失效
公开(公告)号：JP2000347185A
公开(公告)日：2000-12-15
申请号：JP15803299
申请日：1999-06-04
申请人： HITACHI LTD , HITACHI ELECTRONIC DEVICES CO
发明人： MIYAWAKI TOSHITSUGU , NIWADA YOSHINORI , MATSUDA HIROMI , TAKAKU SHIGETAKA , MORI YUJI , HIRAYAMA TOSHIO
IPC分类号： G02F1/1335 , F21V8/00 , G02F1/13357
摘要： PROBLEM TO BE SOLVED: To obtain a device equipped with a back light which improves the front face luminance of a liquid crystal panel and which reduces changes in the luminance in the whole screen by preparing a light guide plate having V- grooves and microdots or microdots formed in one body on the surface of a transparent resin material to constitute the back light. SOLUTION: The back light is constituted with a light guide plate which is prepared by forming V-grooves and microdots or microdots in one body on the surface of a transparent resin material such as a n acrylic resin. For example, the light guide plate GLB to constitute the back light of a liquid crystal display device is made of a wedge acrylic plate in which the side face PES (entrance face where light enters) side of the cross section where a linear lamp as a linear light source is to be disposed is made thick. One or a plurality of protrusions (engaging protrusions) STP to engage the plate to a mold case are formed on the line adjacent to the entrance face PES. On the bottom of the plate, V-grooves VSG and microdots MDT are formed into one body.

7. 发明专利

NL1015060A1 未知
公开(公告)号：NL1015060A1
公开(公告)日：2000-10-31
申请号：NL1015060
申请日：2000-04-28
申请人： HITACHI LTD , NITTO DENKO CORP
发明人： HIRA YASUO , TANIGUCHI HITOSHI , MIYAWAKI TOSHITSUGU , YANO SHUJI
IPC分类号： G09F9/00 , F21V8/00 , G02B6/00 , G02F1/1335 , G02F1/13357
摘要： A light guide plate which can achieve improvement of back-lighting or front-lighting luminance without increase of luminance of a light source, and a liquid crystal display device using such a light guide plate. A large number of concave small dots are formed in a surface of the light guide plate opposite to a light emitting surface of the light guide plate which emits light to a liquid crystal cell array so that light incident on the light guide plate from the light source is reflected at the concave small dots in the direction toward the light emitting surface of the light guide plate. Each of the concave small dots is shaped like a triangle with a sectional inclination angle of from 50 to 60° in sectional view and shaped like an approximate rectangle or square in plan view in the direction perpendicular to a surface of the light guide plate and disposed so that a long side of the approximate rectangle or a side of the approximate square is approximately parallel with the longitudinal direction of the light source.

8. 发明专利

NL1015060C2 未知
公开(公告)号：NL1015060C2
公开(公告)日：2001-02-14
申请号：NL1015060
申请日：2000-04-28
申请人： HITACHI LTD , NITTO DENKO CORP
发明人： HIRA YASUO , TANIGUCHI HITOSHI , MIYAWAKI TOSHITSUGU , YANO SHUJI
IPC分类号： G09F9/00 , F21V8/00 , G02B6/00 , G02F1/1335 , G02F1/13357
摘要： A light guide plate which can achieve improvement of back-lighting or front-lighting luminance without increase of luminance of a light source, and a liquid crystal display device using such a light guide plate. A large number of concave small dots are formed in a surface of the light guide plate opposite to a light emitting surface of the light guide plate which emits light to a liquid crystal cell array so that light incident on the light guide plate from the light source is reflected at the concave small dots in the direction toward the light emitting surface of the light guide plate. Each of the concave small dots is shaped like a triangle with a sectional inclination angle of from 50 to 60° in sectional view and shaped like an approximate rectangle or square in plan view in the direction perpendicular to a surface of the light guide plate and disposed so that a long side of the approximate rectangle or a side of the approximate square is approximately parallel with the longitudinal direction of the light source.

9. 发明专利

JPH05200444A SHADOW MASK FORMING DEVICE 失效
公开(公告)号：JPH05200444A
公开(公告)日：1993-08-10
申请号：JP1374592
申请日：1992-01-29
申请人： HITACHI LTD
发明人： ITO MASAHIRO , MIYAWAKI TOSHITSUGU
IPC分类号： B21D22/26 , B21D24/00 , H01J9/14 , H01J29/07
摘要： PURPOSE:To prevent the peripheral part of a sheet metal from being deformed by forming the abutting surface between a die and a pressure pad to the imaginary extending surface outside the abutting surface between a knockout and a punch so that it is more inclined toward the die side from the extending surface between the inside surface and the outside surface. CONSTITUTION:The die 15 and a pressure pad 17 are provided to press the periphery of the sheet metal 13 respectively at its surface and back face. The knockout 14 and the punch 16 are prepared to press and form a part located between the die 15 and the pressure pad 17 respectively from its surface and back face excluding the periphery of the sheet metal material 13. The abutting surface between the die 15 and the pressure pad 17 is formed to the imaginary extending surface outside the abutting surface between the knockout 14 and the punch 16 so that it is more inclined to the die side than to the extended surface between the inside end and the outside end. In this way, generation of deformation can be avoided on the peripheral part of a shadow mask curved surface formed.

10. 发明专利

JPS6477824A MANUFACTURE OF SHADOW MASK FRAMING 失效
公开(公告)号：JPS6477824A
公开(公告)日：1989-03-23
申请号：JP23216487
申请日：1987-09-18
申请人： HITACHI LTD
发明人： TANABE HIDEO , SHINODA MASAKI , KAWAMURA TAKAO , IKEDA MAMORU , MIYAWAKI TOSHITSUGU
IPC分类号： H01J9/14
摘要： PURPOSE:To suppress generation of wrinkles on a shadow mask by placing thereon a metal sheet in approx. the same shape as the weld surface of a frame, and putting an electrode having a tip in the same shape as the desired welding line on the metal sheet in pressurization and close contact, followed by supply of current. CONSTITUTION:A shadow mask 2 is heated from above by a heater 7 to approx. 120 deg.C. When the temp. of this shadow mask 2 has become constant, a table 4 is moved, and a frame 1 is moved and fixed to a specified position under the shadow mask 2. Simultaneously with movement and fixation of the frame 1 to the specified position, an aluminum sheet 8 in approx. the same shape as the top 1a of the frame 1 is placed on the welds of the shadow mask 2. An electrode 9 of Cu or Cu alloy, which is in the same shape as the welds 1b shown by a two-dotted chain line connecting approx. the center of the frame top 1a and has a tip with sharp profile, is put on the sheet 8 in pressurization and close contact, followed by supply of current. According to this arrangement the shadow mask 2 is welded momentarily throughout the outside circumference of the frame 1.

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