JP3596396B2 - Front light for reflective liquid crystal display device and reflective liquid crystal display device - Google Patents
Front light for reflective liquid crystal display device and reflective liquid crystal display device Download PDFInfo
- Publication number
- JP3596396B2 JP3596396B2 JP36859799A JP36859799A JP3596396B2 JP 3596396 B2 JP3596396 B2 JP 3596396B2 JP 36859799 A JP36859799 A JP 36859799A JP 36859799 A JP36859799 A JP 36859799A JP 3596396 B2 JP3596396 B2 JP 3596396B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- crystal display
- display device
- circuit board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は反射型液晶表示装置用フロントライト及び反射型液晶表示装置に関するものである。
【0002】
【従来の技術】
液晶表示装置は小型軽量な表示装置として多用されている。小型ビデオカメラにおいても電子ビューファインダーとして使われているが、従来使用されている液晶ビューファインダーは透過型液晶表示装置である。
【0003】
【発明が解決しようとする課題】
本発明は反射型液晶表示装置とそれに使用する反射型液晶表示装置用フロントライトに関するものであり、反射型液晶表示装置は液晶表示素子の表示面側から液晶表示素子に照明光を投射しなければならない。本発明の目的は反射型液晶表示装置用フロントライト筐体内及び反射型液晶表示装置へのゴミの侵入を防ぎ、反射型液晶表示装置のコントラストを向上させることにある。
【0004】
【課題を解決するための手段】
少なくとも、回路基板と、該回路基板に搭載され回路基板面上部に発光する発光素子と、導光板、拡散部材、偏光板、半透過反射シートを位置決め固定する筐体とを備える反射型液晶表示装置用フロントライトであって、
前記導光板を前記発光素子の上面に位置するように前記筐体内に組み込み、該導光板の内側面の前面より発光素子からの光を出光させ、前記拡散部材及び前記偏光板を前記導光板の内側面の前面に配置し、該偏光板から回路基板に平行な光を出光させ、該平行光の前方に反射光が回路基板側に入射するように前記半透過型反射シートを前記筐体内に組み込み、前記筐体の半透過型反射シート上方部位には反射型液晶表示素子を視認するための窓部を有し、該窓部に透明フィルムを設けた反射型液晶表示装置用フロントライトとする。
【0005】
少なくとも、回路基板と、該回路基板に搭載される液晶表示素子と、該回路基板に搭載され回路基板面上部に発光する発光素子と、導光板、拡散部材、偏光板、半透過反射シートを位置決め固定する筐体とを備える反射型液晶表示装置であって、
前記導光板を前記発光素子の上面に位置するように前記筐体内に組み込み、該導光板の内側面の前面より発光素子からの光を出光させ、前記拡散部材及び前記偏光板を前記導光板の内側面の前面に配置し、該偏光板から回路基板に平行な光を出光させ、該平行光の前方に反射光が反射型液晶表示素子に入射するように前記半透過型反射シートを前記筐体内に組み込み、前記筐体の前記半透過型反射シート上方部位には反射型液晶表示素子を視認するための窓部を有し、該窓部に透明フィルムを設けた反射型液晶表示装置とする。
【0006】
透明フィルムを半透過型反射シートに設けられた偏光板と同じ偏光特性を有する偏光板とする。
【0007】
【発明の実施の形態】
図1は本発明による反射型液晶表示装置用フロントライトの正面断面図、図2は左側面図、図3は右側面図、図4は下面図である。フロントライトは、反射型液晶表示素子を視認するための窓部2を有する筐体1と筐体1に組込まれる導光部材3、拡散部材4、偏光板5、半透過型反射シート6、透明フィルム7で構成されている。
【0008】
筐体1の窓部2の内側に透明フィルム7を貼付し、筐体1内部に形成された段部8と溝部9、10に半透過型反射シート6を組込む。直方体である導光部材3の4面を包み込む反射部材11と共に一体化された、導光部材3、拡散部材4、偏光板5、反射部材11を筐体1に形成された凹部1aに組込むとフロントライトは完成する。偏光板5と拡散部材4の間にレンズシートを積層することもある。
【0009】
図5は本発明による反射型液晶表示装置の正面断面図、図6は左側面図、図7は右側面図である。反射型液晶表示素子13、発光素子であるLED15、フロントライト用固定基台14を所定位置に搭載した回路基板12のフロントライト用固定基台14上にフロントライトを搭載して完成した反射型液晶表示装置である。
【0010】
図8は図5と同じ図で、本発明による反射型液晶表示装置用フロントライトの正面断面図である。反射型液晶表示装置は図中に示す目16方向から画像を見るものである。発光素子15からの光(矢印▲1▼)は導光部材3の下面から導光部材3に導入される。導入された光は導光部材3の内側面の前面に配置された拡散部材4で拡散され、偏光板5を透過した直線偏光光(以下P波という)だけが矢印▲2▼の方向に進む。半透過型反射シート6はP波を反射するものであり、半透過型反射シート6で反射されたP波は矢印▲3▼に進み反射型液晶表示素子13に入射するように半透過型反射シート6が配置されている。
【0011】
反射型液晶表示素子13は電源オフ状態でP波がそのまま液晶を通過するように配置してあり、反射型液晶表示素子13で反射されたP波は矢印▲4▼方向に進む。半透過型反射シート6の偏光板6bはP波を透過しない状態に配置してあり、電源オフ状態では黒表示状態となっている。
【0012】
反射型液晶表示素子13の電源オン状態ではP波は液晶で偏光され、反射型液晶表示素子13で偏光されて反射された偏光光は矢印▲4▼方向に進む。半透過型反射シート6の偏光板6bは電源オン状態で反射された光を透過する状態に配置されているので、電源オン状態では白表示状態となっている。
【0013】
偏光板の偏光方向と反射型液晶表示素子の配置・組み合せは反射型液晶表示素子により適宜選定される。
【0014】
透明フィルム7は窓部2から筐体1内部にゴミが入るのを防止するためのものであり、筐体1の外面に貼付することも可能である。
【0015】
透明フィルムの代わりに偏光板を使用すると筐体内部での散乱光は吸収され、反射型液晶表示素子の反射光と同一の偏光光のみ偏光板により透過するため、液晶のスイッチングに対応した黒表示、白表示が可能となりコントラストを向上することができる。この時半透過型反射シートの偏光板との偏光方向を揃える必要があることは言うまでもない。
【0016】
【発明の効果】
フロントライトの窓部に透明フィルムまたは偏光板を設けたのでフロントライト及び液晶表示素子表示面へのゴミ侵入を防止できる。
【0017】
透明フィルムの代わりに偏光板を使用することでコントラストを向上することができる。
【図面の簡単な説明】
【図1】本発明による反射型液晶表示装置用フロントライトの正面断面図
【図2】左側面図
【図3】右側面図
【図4】下面図
【図5】本発明による反射型液晶表示装置の正面断面図
【図6】左側面図
【図7】右側面図
【図8】本発明による反射型液晶表示装置用フロントライトの正面断面図
【符号の説明】
1 筐体
1a 凹部
2 窓部
3 導光部材
4 拡散部材
5 偏光板
6 半透過型反射シート
6a 反射板
6b 偏光板
7 透明フィルム
8 筐体の段部
9 溝部
10 溝部
11 反射部材
12 基板
13 反射型液晶表示素子
14 基台[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a front light for a reflection type liquid crystal display device and a reflection type liquid crystal display device.
[0002]
[Prior art]
Liquid crystal display devices are frequently used as small and lightweight display devices. Although used as an electronic viewfinder in a small video camera, a conventionally used liquid crystal viewfinder is a transmission type liquid crystal display device.
[0003]
[Problems to be solved by the invention]
The present invention relates to a reflection-type liquid crystal display device and a front light for the reflection-type liquid crystal display device used therein, and the reflection-type liquid crystal display device must project illumination light onto the liquid crystal display element from the display surface side of the liquid crystal display element. No. SUMMARY OF THE INVENTION An object of the present invention is to prevent dust from entering a front light housing for a reflection type liquid crystal display device and into the reflection type liquid crystal display device, thereby improving the contrast of the reflection type liquid crystal display device.
[0004]
[Means for Solving the Problems]
At least a reflection type liquid crystal display device including a circuit board, a light emitting element mounted on the circuit board and emitting light on the upper surface of the circuit board, and a housing for positioning and fixing a light guide plate, a diffusion member, a polarizing plate, and a transflective sheet. Front light,
The light guide plate is incorporated in the housing so as to be located on the upper surface of the light emitting element, and light from the light emitting element is emitted from the front surface of the inner surface of the light guide plate, and the diffusing member and the polarizing plate are disposed on the light guide plate. Arranged on the front side of the inner surface, emits light parallel to the circuit board from the polarizing plate, and places the semi-transmissive reflection sheet in the housing so that reflected light is incident on the circuit board side in front of the parallel light. Incorporation, a window for viewing the reflective liquid crystal display element in a portion above the transflective reflective sheet of the housing, and a front light for a reflective liquid crystal display device having a transparent film provided on the window. .
[0005]
At least a circuit board, a liquid crystal display element mounted on the circuit board, a light emitting element mounted on the circuit board and emitting light on the upper surface of the circuit board, and a light guide plate, a diffusion member, a polarizing plate, and a transflective sheet are positioned. A reflective liquid crystal display device comprising a housing to be fixed,
The light guide plate is incorporated in the housing so as to be located on the upper surface of the light emitting element, and light is emitted from the light emitting element from the front surface of the inner surface of the light guide plate, and the diffusing member and the polarizing plate are formed of the light guide plate. The semi-transmissive reflection sheet is disposed on the front surface of the inner surface, emits light parallel to the circuit board from the polarizing plate, and the transflective reflection sheet is arranged such that reflected light is incident on the reflection type liquid crystal display element in front of the parallel light. A reflection type liquid crystal display device which is incorporated in a body and has a window for viewing the reflection type liquid crystal display element at a portion above the transflective reflection sheet of the housing, and a transparent film is provided on the window portion. .
[0006]
The transparent film is a polarizing plate having the same polarization characteristics as the polarizing plate provided on the transflective reflection sheet.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
1 is a front sectional view of a front light for a reflection type liquid crystal display device according to the present invention, FIG. 2 is a left side view, FIG. 3 is a right side view, and FIG. 4 is a bottom view. The front light includes a housing 1 having a
[0008]
A
[0009]
5 is a front sectional view of a reflection type liquid crystal display device according to the present invention, FIG. 6 is a left side view, and FIG. 7 is a right side view. A reflective liquid crystal completed by mounting a front light on a front
[0010]
FIG. 8 is the same view as FIG. 5 and is a front sectional view of a front light for a reflective liquid crystal display according to the present invention. The reflection type liquid crystal display device is for viewing an image from an
[0011]
The reflection type liquid
[0012]
When the power of the reflective liquid
[0013]
The polarization direction of the polarizing plate and the arrangement / combination of the reflective liquid crystal display device are appropriately selected depending on the reflective liquid crystal display device.
[0014]
The
[0015]
If a polarizing plate is used instead of a transparent film, the scattered light inside the housing is absorbed, and only the same polarized light as the reflected light from the reflective liquid crystal display element is transmitted by the polarizing plate. , White display is possible, and the contrast can be improved. At this time, it is needless to say that the polarization directions of the transflective reflection sheet and the polarizing plate need to be aligned.
[0016]
【The invention's effect】
Since a transparent film or a polarizing plate is provided on the window of the front light, dust can be prevented from entering the front light and the display surface of the liquid crystal display element.
[0017]
The contrast can be improved by using a polarizing plate instead of the transparent film.
[Brief description of the drawings]
1 is a front sectional view of a front light for a reflection type liquid crystal display device according to the present invention. FIG. 2 is a left side view. FIG. 3 is a right side view. FIG. 4 is a bottom view. FIG. 6 is a left side view. FIG. 7 is a right side view. FIG. 8 is a front sectional view of a front light for a reflective liquid crystal display device according to the present invention.
REFERENCE SIGNS LIST 1
Claims (4)
回路基板と、A circuit board,
該回路基板に搭載され回路基板面上部に発光する発光素子と、A light emitting element mounted on the circuit board and emitting light on the upper surface of the circuit board,
導光板、拡散部材、偏光板、半透過反射シートを位置決め固定する筐体とを備える反射型液晶表示装置用フロントライトであって、A light guide plate, a diffusion member, a polarizing plate, a housing for positioning and fixing the transflective sheet, a front light for a reflection-type liquid crystal display device,
前記導光板を前記発光素子の上面に位置するように前記筐体内に組み込み、該導光板の内側面の前面より発光素子からの光を出光させ、前記拡散部材及び前記偏光板を前記導光板の内側面の前面に配置し、該偏光板から回路基板に平行な光を出光させ、該平行光の前方に反射光が回路基板側に入射するように前記半透過型反射シートを前記筐体内に組み込み、前記筐体の半透過型反射シート上方部位には反射型液晶表示素子を視認するための窓部を有し、該窓部に透明フィルムを設けたことを特徴とする反射型液晶表示装置用フロントライト。The light guide plate is incorporated in the housing so as to be located on the upper surface of the light emitting element, and light is emitted from the light emitting element from the front surface of the inner surface of the light guide plate, and the diffusing member and the polarizing plate are formed of the light guide plate. Arranged on the front side of the inner surface, emits light parallel to the circuit board from the polarizing plate, and places the transflective reflection sheet in the housing so that reflected light is incident on the circuit board side in front of the parallel light. A reflection type liquid crystal display device, wherein a window portion for viewing the reflection type liquid crystal display element is provided in an upper part of the transflective reflection sheet of the housing, and a transparent film is provided in the window portion. For front light.
回路基板と、A circuit board,
該回路基板に搭載される液晶表示素子と、A liquid crystal display element mounted on the circuit board;
該回路基板に搭載され回路基板面上部に発光する発光素子と、A light emitting element mounted on the circuit board and emitting light on the upper surface of the circuit board,
導光板、拡散部材、偏光板、半透過反射シートを位置決め固定する筐体とを備える反射型液晶表示装置であって、A light guide plate, a diffusion member, a polarizing plate, a housing for positioning and fixing the transflective sheet, a reflective liquid crystal display device,
前記導光板を前記発光素子の上面に位置するように前記筐体内に組み込み、該導光板の内側面の前面より発光素子からの光を出光させ、前記拡散部材及び前記偏光板を前記導光板の内側面の前面に配置し、該偏光板から回路基板に平行な光を出光させ、該平行光の前方に反射光が反射型液晶表示素子に入射するように前記半透過型反射シートを前記筐体内に組み込み、前記筐体の前記半透過型反射シート上方部位には反射型液晶表示素子を視認するための窓部を有し、該窓部に透明フィルムを設けたことを特徴とする反射型液晶表示装置。The light guide plate is incorporated in the housing so as to be located on the upper surface of the light emitting element, and light is emitted from the light emitting element from the front surface of the inner surface of the light guide plate, and the diffusing member and the polarizing plate are formed of the light guide plate. The transflective sheet is disposed on the front surface of the inner surface, emits light parallel to the circuit board from the polarizing plate, and the semi-transmissive reflective sheet is so arranged that reflected light is incident on the reflective liquid crystal display element in front of the parallel light. A reflection type, which is incorporated in a body and has a window for viewing a reflection type liquid crystal display element in a portion of the housing above the transflective reflection sheet, and a transparent film is provided on the window. Liquid crystal display.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP36859799A JP3596396B2 (en) | 1999-12-27 | 1999-12-27 | Front light for reflective liquid crystal display device and reflective liquid crystal display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP36859799A JP3596396B2 (en) | 1999-12-27 | 1999-12-27 | Front light for reflective liquid crystal display device and reflective liquid crystal display device |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001183660A JP2001183660A (en) | 2001-07-06 |
JP3596396B2 true JP3596396B2 (en) | 2004-12-02 |
Family
ID=18492244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP36859799A Expired - Fee Related JP3596396B2 (en) | 1999-12-27 | 1999-12-27 | Front light for reflective liquid crystal display device and reflective liquid crystal display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3596396B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6502686B2 (en) * | 2015-01-29 | 2019-04-17 | シチズンファインデバイス株式会社 | Reflective liquid crystal display |
-
1999
- 1999-12-27 JP JP36859799A patent/JP3596396B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2001183660A (en) | 2001-07-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6490104B1 (en) | Illumination system for a micro display | |
JPH08201805A (en) | Illumination structure of liquid crystal display surface | |
JP4970177B2 (en) | Surface light emitting device and display device | |
JP2005509899A (en) | Optical device with reflective and transmissive modes for display | |
US7537352B2 (en) | Light emitting diode illumination device capable of providing uniformly polarized light | |
US8294847B2 (en) | Optical unit, backlight device, liquid crystal module and liquid crystal display apparatus | |
JP2001281655A (en) | Illumination system and view finder provided with the same | |
JP4862208B2 (en) | LCD backlight structure | |
US20190227218A1 (en) | Lighting device and display device | |
CN114200719A (en) | Backlight module and display device | |
JP2005091494A (en) | Electrooptical device and electronic appliance | |
JP3596396B2 (en) | Front light for reflective liquid crystal display device and reflective liquid crystal display device | |
JP3539904B2 (en) | Front light for reflective liquid crystal display device and reflective liquid crystal display device | |
JP3596386B2 (en) | Reflective liquid crystal front light and reflective liquid crystal display device | |
JPH10319860A (en) | Liquid crystal display device | |
KR20150079319A (en) | Display device | |
KR101216174B1 (en) | Display apparatus | |
US6394611B1 (en) | Solid rod dust-proof structure for projecting apparatuses | |
JP3673896B2 (en) | Reflective liquid crystal display | |
JP5713852B2 (en) | Reflective liquid crystal display | |
JP2004031146A (en) | Backlight and liquid crystal display using it | |
JP4301678B2 (en) | Electronic viewfinder using a reflective liquid crystal display | |
CN110609413A (en) | Illumination device and display device | |
JP2004151576A (en) | Reflective liquid crystal display device | |
JP4709345B2 (en) | Projection display |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040223 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040302 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040423 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040608 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040727 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040824 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040830 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 3596396 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070917 Year of fee payment: 3 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090917 Year of fee payment: 5 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090917 Year of fee payment: 5 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090917 Year of fee payment: 5 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100917 Year of fee payment: 6 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110917 Year of fee payment: 7 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120917 Year of fee payment: 8 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130917 Year of fee payment: 9 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |