JPS60123823A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPS60123823A JPS60123823A JP23207483A JP23207483A JPS60123823A JP S60123823 A JPS60123823 A JP S60123823A JP 23207483 A JP23207483 A JP 23207483A JP 23207483 A JP23207483 A JP 23207483A JP S60123823 A JPS60123823 A JP S60123823A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- light
- natural light
- clock
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は液晶表示装置に関するものである。さら如、本
発明は装置の内蔵光源と外部の自然光を導入した光を状
況に応じて切り換えて、背面照明とする透過型液晶表示
体に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a liquid crystal display device. Furthermore, the present invention relates to a transmissive liquid crystal display that uses a built-in light source of the device and external natural light to provide back illumination by switching depending on the situation.
° 従来、透過型液晶表示装置′の背面照明には、装置
に内蔵した光源が用いられているが、小型の携帯機器に
使用した場合には、電源として弔いらねる電池の容量が
少なく、電池寿命が短くなって１２十う欠点があった。° Conventionally, a light source built into the device has been used for backlighting a transmissive liquid crystal display device, but when used in a small portable device, the capacity of the battery required as a power source is small, and the battery There were 120 disadvantages such as shortened lifespan.
そこで考夫られたのが内部光源と外部自然光の併用方式
である。第１．２図は該方式の概略図であり、第１図は
内部光源第１１用時第２図は外部自然光利用時の断面を
示している。Therefore, we devised a method that uses both an internal light source and external natural light. FIG. 1.2 is a schematic diagram of the system, and FIG. 1 shows a cross section when using an internal light source 11 and FIG. 2 shows a cross section when using external natural light.
液晶パネル１の裏面に内部光源および外部自然光をパネ
ルに導くくさび形の導光体２を配置し、さらに、内部光
源として、螢光燈３を導光体の棋に１！ｌｉ″置する。A wedge-shaped light guide 2 that guides an internal light source and external natural light to the panel is arranged on the back side of the liquid crystal panel 1, and a fluorescent lamp 3 is used as an internal light source. Place li''.
また、外部自然光を導入するために。Also to introduce external natural light.
回転して、Ｌ部が開閉可能な箱体部４に堰りつけられた
反射板５が導光体の裏側に配置されている。A reflecting plate 5 attached to a box part 4 whose L part can be rotated to open and close is arranged on the back side of the light guide.
夜間や暗い部屋の内では、内部光源の螢光灯を使う。螢
光灯から出六光は一部は直接、また残りｒ［反射板６に
より反射されてから導光体２に入射される。導光体に入
射された光はフレネル状の形状の部分で反射され、液晶
パネル１に照射される。At night or in a dark room, use an internal fluorescent light source. A portion of the six lights emitted from the fluorescent lamp enters the light guide 2 directly, and the rest is reflected by the reflector 6. The light incident on the light guide is reflected by the Fresnel-shaped portion and is irradiated onto the liquid crystal panel 1.
周囲が明るい時には外部の自然光を利用する第２図のよ
うな方式となる。すなわち、箱体部４を背後Ｋ ＃Ａｔ
八て、図のような配置にして、周囲の光を反射板５を用
いて、液晶パネル１の背＃に導入するのである。このよ
うに、内部光源及び自然光の併用により、電池寿命の長
い携帯用機器が実現できるのである。When the surroundings are bright, the method shown in Figure 2 uses external natural light. In other words, the box part 4 is behind K #At
Then, with the arrangement as shown in the figure, ambient light is introduced into the back of the liquid crystal panel 1 using a reflecting plate 5. In this way, the combination of internal light sources and natural light can provide portable devices with long battery life.
ところが、前記のような導光体２の形状では、内部元首
使用時と外部自然光使用時で、導光体２からの出射光７
の角度依存性がある。屈折率ｎ＊１５の利料を用いて、
第３図のｔ＝５０＋ｕ＋、ｄ＝５朋の形状の導光体を用
いｆｃ場合の内部光源使用時々外部自然光使用時の出射
光量の角度依存性が第３及び第４図に示しである。第３
図からは１図の右側がセットの手前即ち、液晶パネルの
画面の時計の文字盤にたとえて６時方向とすると、パネ
ルに重重の方向から６時側へ３０°位の方向の光線がも
っとも多くなることがわかる。また、第４図からは、パ
ネルに垂直の方向から、１２時側へ約１５°位の方向の
光線がもっとも強くなることがわかる。”従って、内部
元首使用時にはパネルの６蒔方向が明るくなり、外部自
然光使用時ＫＦｉパ呻ルの１２時方向がもっとも明るい
方向となるのである。ところが、功在、液晶ディスプレ
イの主流として用いられているツイストネマチック型液
晶ディヌプレイは視角依存性が強く、第５図のよう忙液
晶パネルの視角φ、θを定義する（θけ６時方向で０と
し時計方向を正とする）とθ２φｏ、４５゜・・・・・
・３１５°ノトキ、φ＝５００及び７０’方向の液晶干
イスプレイのコントラストは、第６図（ハ））〜（イ）
のよ）になる。（ａ）〜ωはおのおの液晶への印加実効
電圧Ｖ冨１．４ 、 １．６ 、 １．８ 、 ２．
Ｏ、、３，０、４，０ボルトのときのコントラストであ
る。この図で内周の大角形は、電圧ＯＶのときの透過光
１００チのコントラストを表わし、外周の六角形Ｆｉ絶
対暗黒のコント２ストＱ４を表わしている。＋次、破線
けφ＝５０°、一点ｍ線Ｍφ＝ ’７０’視角のコント
ラストである。このように、θ＝００明視方向がもっと
もはっきり像が見える。これに対して、明視と逆の６
＝ １８００の方向では、像のコント２ストハうす＜
ｔｃっでいる。従って、的記の機器の液晶パネルとして
６時明視のパネルを用いると一内部光源使用時には、明
視の方向と最つとも、照明の明るい方向とが一致してＯ
好な画像が得られるが、外部の自然光使用時には、明視
方向への照明が暗くなって、良好な画像が得られないと
ｒう欠点があ−Ｉた。However, with the shape of the light guide 2 as described above, the light 7 emitted from the light guide 2 is
There is an angle dependence of Using a refractive index of n*15,
FIGS. 3 and 4 show the angular dependence of the amount of emitted light when using an internal light source and sometimes using external natural light in the fc case using a light guide having the shape of t=50+u+ and d=5 in FIG. Third
From the figure, the right side of Figure 1 is the front of the set, which is the 6 o'clock direction compared to the clock face on the LCD panel screen.The light rays in the direction of about 30 degrees from the direction of the weight to the 6 o'clock side of the panel are the most It turns out that there will be more. Furthermore, from FIG. 4, it can be seen that the light rays in the direction approximately 15 degrees toward the 12 o'clock side from the direction perpendicular to the panel are the strongest. ``Therefore, when using internal light, the 6 o'clock direction of the panel becomes the brightest, and when using external natural light, the 12 o'clock direction of the KFi panel becomes the brightest direction. The twisted nematic type liquid crystal display has a strong viewing angle dependence, and if we define the viewing angles φ and θ of a busy LCD panel as shown in Figure 5 (θ is 0 at 6 o'clock and positive when clockwise), θ2φo, 45°・・・・・・
・The contrast of the liquid crystal display in the 315° angle, φ = 500 and 70' directions is shown in Figure 6 (C) to (B).
become). (a) to ω are the effective voltage V applied to the liquid crystal, respectively: 1.4, 1.6, 1.8, 2.
This is the contrast at 0, 3,0, and 4,0 volts. In this figure, the large square on the inner periphery represents the contrast of 100 degrees of transmitted light when the voltage is OV, and the hexagon on the outer periphery represents the contrast Q4 of absolute darkness. + order, dashed line φ = 50°, single point m line Mφ = '70' viewing angle contrast. In this way, the image can be seen most clearly in the θ=00 clear viewing direction. On the other hand, 6
= In the direction of 1800, the contrast of the image <
tc is here. Therefore, if a 6 o'clock clear vision panel is used as the liquid crystal panel of the device mentioned above, when an internal light source is used, the clear vision direction and the brightest direction of the illumination will coincide with each other.
Although a good image can be obtained, there is a drawback that when using external natural light, the illumination in the direction of clear vision becomes dark and a good image cannot be obtained.
本発明はかかる欠点を解決するためになされたものであ
り、内部光でも外部自然光でも良好な画質の映像が得ら
れる液晶老示装置を提供することを目的とする。The present invention has been made to solve these drawbacks, and it is an object of the present invention to provide a liquid crystal display device that can provide images of good quality both in internal light and in external natural light.
〔櫃要）
本発明の研妥は装置に内蔵した光源まｆｃは外部の自然
光を状況により切り換えて背ＷＩＮ明とする透過型液晶
表示体に於いて、液晶表示体の明視方向、−）ｆｃＨ１
７時半から生方時生方向としたことである。[Required] The present invention was developed in the case of a transmissive liquid crystal display in which the light source built into the device switches external natural light depending on the situation to provide back-WIN brightness, and the light source is used to control the bright viewing direction of the liquid crystal display. fcH1
From 7:30 a.m., it was decided that the direction would be open.
第５図をｙでわかるように、明視方向と直角な方向、即
ち、３時−９時方向に於いては、画像のコントラス）ｌ
ｄ６時の明視方向には劣るものの、比較的、良好な値を
示している。すなわち、３１１￥−９時方向では平均的
に広い視角が得られているのである。＃って、従来例に
比較して、右または左１司りに、明視方向を回転すｈげ
、両面の６時−１２時方向に視角の広−へ液晶表示装置
が実現できるのである。具体的には、明視方向を液晶パ
ネルの１時半から４時半、まｆｃｌ−ｔ７７時半ら１０
０時半方向とすれば良いのである。第６図は実施例の１
つであり、明視方向ｆ３時としたものの図である。As can be seen with y in Figure 5, in the direction perpendicular to the direction of clear vision, that is, from 3 o'clock to 9 o'clock, the contrast of the image is
Although it is inferior to the clear vision direction at d6, it shows a relatively good value. In other words, a wide viewing angle is obtained on average in the 311 yen - 9 o'clock direction. Compared to the conventional example, by rotating the clear viewing direction to the right or left, it is possible to realize a liquid crystal display device with a wide viewing angle from 6 o'clock to 12 o'clock on both sides. Specifically, the clear viewing direction is from 1:30 to 4:30 on the LCD panel, and from 7:30 to 10:30 on fcl-t.
It suffices to set it in the 0:30 direction. Figure 6 shows Example 1.
This is a diagram in the clear viewing direction f3.
このように、非常忙簡単な方法により、６時−１２８１
１？方向の視角の改善が行なえ、本発明の効果は非常に
大きい。もちろん、６時−１２時方向の視角の改善に伴
なって、３時ｔｆｃｕ９時方向のどちらかが犠牲にされ
るが、小型携帯機器の場合にはパーソナルユース用であ
り、この欠点は余り問題とｔｅらない。In this way, by a very simple method, you can
1? The visual angle in the direction can be improved, and the effects of the present invention are very large. Of course, with the improvement of the visual angle from 6 o'clock to 12 o'clock, either the 3 o'clock TFCU or 9 o'clock direction will be sacrificed, but in the case of small portable devices, this is for personal use, so this drawback is not a problem. I don't know.
第１図・・内部光源使用時の該液晶表示装置の同第２図
・・外部光使用時の該液晶表示′＠置の同第３図・・内
部光源からの光の進行方向の同第４図・・外部光の進行
状態を示す１
第５図・・液晶パネルの視角を定義する図ｗＸ６ 図（
ａ）〜（ハ・・ツイストネマチック型液晶バスールの視
角依存性
第７図１・・本発明の実施例の図
１・・・・・・液晶パネル
２・・・・・・導光体
３・・・・・・螢光灯
４・・・・・・箱体
５・・・・・・反射板
６・・・・・・光源用反射板
７・・・・・・表示光線
以 ト
出願人 株式会社 諏訪精工舎
代理人 弁理士 最 ト 務Figure 1 shows the liquid crystal display when an internal light source is used.Figure 2 shows the liquid crystal display when external light is used.Figure 3 shows the direction in which light from the internal light source travels. Figure 4: 1 showing the progress of external light Figure 5: Diagram defining the viewing angle of the liquid crystal panel wX6 Figure (
a) - (c) Viewing angle dependence of twisted nematic liquid crystal bathour Figure 7 1 Figure 1 of the embodiment of the present invention Liquid crystal panel 2 Light guide 3 ...Fluorescent lamp 4...Box body 5...Reflector plate 6...Reflector plate for light source 7...Indication light beam Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney
Claims (1)
により切り換えて背面照明とする透過型液晶表示体に於
いて、液晶表示体の明視方向を時計の目盛りにたとえて
、１時半から４時半方向まｆｃＦｉ７時半から１０時半
方向とじ六ことを特徴とする液晶表示装置。(1) The built-in light source or fc in the device is used for a transmissive liquid crystal display that switches external natural light depending on the situation to provide back illumination.If the clear viewing direction of the liquid crystal display is likened to the scale of a clock, it is 1:30 a.m. A liquid crystal display device characterized in that it closes from 7:30 to 10:30 in the direction from 7:30 to 10:30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23207483A JPS60123823A (en) | 1983-12-08 | 1983-12-08 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23207483A JPS60123823A (en) | 1983-12-08 | 1983-12-08 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60123823A true JPS60123823A (en) | 1985-07-02 |
Family
ID=16933578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23207483A Pending JPS60123823A (en) | 1983-12-08 | 1983-12-08 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60123823A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5054885A (en) * | 1988-10-11 | 1991-10-08 | Minnesota Mining And Manfuacturing Company | Light fixture including a partially collimated beam of light and reflective prisms having peaks lying on a curved surface |
| US5054884A (en) * | 1989-03-06 | 1991-10-08 | Dainippon Screen Mfg Co. Ltd. | Beam splitter including a diffraction grating and one of step shaped, inclined, or curved transparent surface |
| US5339179A (en) * | 1992-10-01 | 1994-08-16 | International Business Machines Corp. | Edge-lit transflective non-emissive display with angled interface means on both sides of light conducting panel |
| US5461547A (en) * | 1993-07-20 | 1995-10-24 | Precision Lamp, Inc. | Flat panel display lighting system |
| US5485354A (en) * | 1993-09-09 | 1996-01-16 | Precision Lamp, Inc. | Flat panel display lighting system |
| US5537233A (en) * | 1993-11-25 | 1996-07-16 | Sanyo Electric Co., Ltd. | Direct-vision/projection type liquid-crystal display having light source at the edge of a gap between two liquid crystal panels |
| US5550715A (en) * | 1993-12-10 | 1996-08-27 | Palm Computing, Inc. | External light source for backlighting display |
| CN102236207A (en) * | 2010-04-27 | 2011-11-09 | 于小林 | Liquid crystal display (LCD) system, light emitting diode zone and method applied to electronic window |
-
1983
- 1983-12-08 JP JP23207483A patent/JPS60123823A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5054885A (en) * | 1988-10-11 | 1991-10-08 | Minnesota Mining And Manfuacturing Company | Light fixture including a partially collimated beam of light and reflective prisms having peaks lying on a curved surface |
| US5054884A (en) * | 1989-03-06 | 1991-10-08 | Dainippon Screen Mfg Co. Ltd. | Beam splitter including a diffraction grating and one of step shaped, inclined, or curved transparent surface |
| US5339179A (en) * | 1992-10-01 | 1994-08-16 | International Business Machines Corp. | Edge-lit transflective non-emissive display with angled interface means on both sides of light conducting panel |
| US5461547A (en) * | 1993-07-20 | 1995-10-24 | Precision Lamp, Inc. | Flat panel display lighting system |
| US5485354A (en) * | 1993-09-09 | 1996-01-16 | Precision Lamp, Inc. | Flat panel display lighting system |
| US5537233A (en) * | 1993-11-25 | 1996-07-16 | Sanyo Electric Co., Ltd. | Direct-vision/projection type liquid-crystal display having light source at the edge of a gap between two liquid crystal panels |
| US5550715A (en) * | 1993-12-10 | 1996-08-27 | Palm Computing, Inc. | External light source for backlighting display |
| CN102236207A (en) * | 2010-04-27 | 2011-11-09 | 于小林 | Liquid crystal display (LCD) system, light emitting diode zone and method applied to electronic window |
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