JPS61256382A - Liquid crystal display unit - Google Patents
Liquid crystal display unitInfo
- Publication number
- JPS61256382A JPS61256382A JP9922285A JP9922285A JPS61256382A JP S61256382 A JPS61256382 A JP S61256382A JP 9922285 A JP9922285 A JP 9922285A JP 9922285 A JP9922285 A JP 9922285A JP S61256382 A JPS61256382 A JP S61256382A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- voltage
- crystal display
- signal
- transmittance
- 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
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、液晶を用いたディスプレイ装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device using liquid crystal.
第４図は例えば特開昭５２−１３４７５０号公報に示さ
れた従来の液晶ディスプレイ装置の系統図で、図におい
て（１）は表示用液晶、（２）は該液晶（１）を駆動す
るドライバ、（３）は温度変化のない抵抗、（４）はド
ライブ電圧を温度補償するための液晶、（５）はドライ
ブ用電圧を供給する電源である。FIG. 4 is a system diagram of a conventional liquid crystal display device disclosed in, for example, Japanese Unexamined Patent Publication No. 52-134750. In the figure, (1) is a display liquid crystal, and (2) is a driver that drives the liquid crystal (1). , (3) is a resistor that does not change with temperature, (4) is a liquid crystal for temperature-compensating the drive voltage, and (5) is a power supply that supplies the drive voltage.
次にＬ記構数における動作について説明する。Next, the operation in the L number will be explained.
液晶（１）はドライバ（２）により所定の電圧が印加さ
れることにより光の透過率が変化しそれにより任意の文
字及び図形を表示する。しかしてこの液晶（１）は一定
の駆動電圧でも温度により光の透過率が変化し、表示さ
れている文字及び図形が変化する。その補正をするため
に、温度変化のない抵抗（３）と温度補償用液晶（４）
で分圧された電圧が温度により変化するのを用いその電
圧に比例しドライバ（２）の駆動電圧を変化させること
により一定の文字及び図形を表現するようにしている。The liquid crystal (1) changes its light transmittance when a predetermined voltage is applied by a driver (2), thereby displaying arbitrary characters and figures. However, even if the driving voltage is constant, the light transmittance of the liquid crystal (1) changes depending on the temperature, and the displayed characters and figures change. To compensate for this, we need a resistor (3) that does not change with temperature and a temperature compensation liquid crystal (4).
By using the fact that the voltage divided by the voltage changes depending on the temperature and changing the drive voltage of the driver (2) in proportion to the voltage, certain characters and figures are expressed.
従来の液晶ディスプレイ装置は以上の様に構成されてい
るので、表示用液晶（１）と温度補償用液晶（４）が異
なる特性の時は充分に温度補償ができない、また両方の
液晶が同じ場所（同じ環境）にないと良い補償ができず
、ディスプレイ構成上、作成が困難となり、最終的にフ
ルカラー大型ディスプレイのビデオ映像などの表示の際
には、画質が落ると百う問題点があった。Conventional liquid crystal display devices are configured as described above, so if the display liquid crystal (1) and temperature compensation liquid crystal (4) have different characteristics, sufficient temperature compensation cannot be achieved, or if both liquid crystals are placed in the same location. (in the same environment), making it difficult to create due to the display configuration, and ultimately, when displaying video images on a large full-color display, there is a problem that the image quality will deteriorate. Ta.
この発明は」−記のような問題点を解消するためになさ
れたもので、種々の条件下で画質の良い液晶ディスプレ
イ装置を得ることを目的とする。This invention has been made to solve the problems mentioned above, and aims to provide a liquid crystal display device with good image quality under various conditions.
この発明に係る液晶ディスプレイ装置は、液晶の透過率
の変化を常に監視して透過率最低点を判別し、該最低点
における電圧値に基づいて最適な基準駆動電圧値を設定
する様にしたものである。The liquid crystal display device according to the present invention constantly monitors changes in the transmittance of the liquid crystal, determines the lowest transmittance point, and sets an optimal reference drive voltage value based on the voltage value at the lowest point. It is.
この発明においては、液晶透過率監視によりあらゆる条
件下でも最適なビデオ画面が得られる。In this invention, liquid crystal transmittance monitoring provides an optimal video screen under all conditions.
以下、この発明の一実施例を図について説明する。第１
図において、（１）は表示用液晶、（２）は液晶（１）
を駆動するドライバ、（５）はドライブ用電圧を供給す
る電源、（Ｉ（）は映像を出すための光源、（７）は液
晶（１）を透過した光の量を電気信号に換える受光器、
（８）はテスト期間中の最小値を検知する最小判別器、
（９）は基準電圧値を記憶するレジスタ、（１０）１士
基準電圧ディジタル値をアナログ早に変換するＤ／Ａコ
ンバータ、（１１）は基準電圧と映像信号及びテスト信
号を加える加算器、（１２）は加算器（１１）の出力の
アナログ信号なディジタル信号に変換するＡ／Ｄコンバ
ータ、（Ｉ３）は映像信号とテスト信号を切換る信号切
換器、（Ｉ４）はビデオ画像等の映像信号、（１５）は
液晶（１）の透過率を調べるためのテスト信号、（１６
）はテストするためのテスト期間信号であり、」−配光
源（６）と受光器（７）及び最小判別器（８）は透過率
最低点を判別する判別手段を構成し、また、レジスタ（
９）は該最低点における電圧値を記憶する記憶手段、ざ
らにＤ／Ａ変換器（ｌＯ）、信号切換器（１３）及び加
算器（１１）はドライバ（２）に最適な基準駆動電圧を
設定して与える設定手段を構成する。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is the display liquid crystal, and (2) is the liquid crystal (1).
(5) is a power supply that supplies drive voltage, (I () is a light source for displaying images, and (7) is a light receiver that converts the amount of light transmitted through liquid crystal (1) into an electrical signal. ,
(8) is a minimum discriminator that detects the minimum value during the test period;
(9) is a register that stores the reference voltage value; (10) is a D/A converter that converts the digital value of the reference voltage into analog data; (11) is an adder that adds the reference voltage, video signal, and test signal; 12) is an A/D converter that converts the output of the adder (11) from an analog signal to a digital signal, (I3) is a signal switcher that switches between a video signal and a test signal, and (I4) is a video signal such as a video image. , (15) is a test signal for checking the transmittance of liquid crystal (1), (16
) is a test period signal for testing, and the light distribution source (6), light receiver (7), and minimum discriminator (8) constitute discriminating means for discriminating the lowest transmittance point, and the register (
9) is a storage means for storing the voltage value at the lowest point, and the D/A converter (lO), signal switch (13) and adder (11) are used to store the optimum reference driving voltage for the driver (2). A setting means for setting and providing is configured.
１−記構数において、液晶（１）は、ＴＮ型の時は、第
２図に示す様な駆動電圧に対する透過特性を示す。すな
わち、駆動電圧の低いＶＯ〜ｖ１の間は映像としては使
用できず、Ｖ１〜Ｖ２の間の部分が比例しているので映
像信号を駆動電圧に変化させると幅広いコントラストが
得られる。液晶（１）は温度及び製造方法によりこの透
過特性が変化するので、常に透過率が最低電圧ｖ１のポ
イントの駆動電圧を調べて設定する必要がある。テスト
する期ｕＭは通常Ｆｐｊ！像信号のない部分で行なう。In the 1-character structure, when the liquid crystal (1) is of the TN type, it exhibits transmission characteristics with respect to the driving voltage as shown in FIG. That is, the range between VO and v1, where the drive voltage is low, cannot be used as an image, and since the part between V1 and V2 is proportional, a wide range of contrast can be obtained by changing the video signal to the drive voltage. Since the transmission characteristics of the liquid crystal (1) change depending on the temperature and manufacturing method, it is necessary to always check and set the driving voltage at the point where the transmittance is the lowest voltage v1. The test period uM is usually Fpj! Perform this in areas where there is no image signal.
しかして、第３図ではＮＴＳＣの際の水平ブランキン
グ時間にテストする場合を示しである。 ｔ１〜 Ｉ２
の時間はテスト期間信号（１６）を出し、テスト信号（
Ｉ５）として液晶（１）の駆動電圧Ｖａ−Ｖ１４ご相当
するものを発し、信号切換器（１３）、加算器（１１）
及びドライバ（１２）を通して液晶（１）に駆動電圧を
かける。一方、光源（８）より液晶（１）を透過した光
は受光器（７）に入り、最小判別器（８）はテストｕ間
中の最小時にレジスタ（８）に対し記憶同期信号を発す
る。その時々の駆動電圧は加算器（１１）の出力後、Ａ
／Ｄコンバータを通しレジスタ（９）のデータ入力に接
続され前述の記憶同期信号発生詩はその値がレジスタ（
９）内に記憶される。記憶された値は駆動電圧ｖ１に相
当する基準値となる。ｔ２〜ｔ３の映像期間はレジスタ
（８）の出力の基準値がＤ／Ａコンバータ（１０）を通
り、加算器（１１）で映像信号（１４）と加算され出力
される。その際の駆動電圧は、必ずｖ１〜ｖ２の間で変
化するため常に幅広いコントラストの映像が得られる。Therefore, FIG. 3 shows the case where the test is performed during the horizontal blanking time for NTSC. t1~I2
During the time period, the test period signal (16) is output, and the test signal (
I5) emits a voltage equivalent to the drive voltage Va-V14 of the liquid crystal (1), and the signal switcher (13) and adder (11)
A driving voltage is applied to the liquid crystal (1) through the driver (12). On the other hand, the light transmitted from the light source (8) through the liquid crystal (1) enters the light receiver (7), and the minimum discriminator (8) issues a storage synchronization signal to the register (8) at the minimum time during the test u. The driving voltage at each time is A after the output of the adder (11).
The above-mentioned storage synchronization signal generator is connected to the data input of the register (9) through the /D converter, and its value is input to the register (9).
9) is stored within. The stored value becomes a reference value corresponding to the drive voltage v1. During the video period from t2 to t3, the reference value output from the register (8) passes through the D/A converter (10), is added to the video signal (14) by the adder (11), and is output. Since the driving voltage at that time always changes between v1 and v2, an image with a wide range of contrast can always be obtained.
なお、」−記実施例ではテスト期間を水平ブランキング
期間としたが、垂直ブランキング期間でも、またマこア
ルで適時実施してもよい。Although the test period was set to be the horizontal blanking period in the embodiment described in ``-'', it may also be conducted during the vertical blanking period or at any time in the makoal.
以上のように、この発明によれば、液晶の最低透過率点
を常に監視し設定するようにしたので、あらゆる条件下
でも最適なビデオ画面が得られる効果がある。As described above, according to the present invention, since the minimum transmittance point of the liquid crystal is constantly monitored and set, an optimal video screen can be obtained under any conditions.
第１図はこの発明の一実施例による液晶ディスプレイ装
置の系統図、第２図はＴＮ型液晶の透過特性図、第３図
はこの発明の一実施例によるタイムチャート、第４図は
従来の液晶ディスプレイ装置の系統図である。
（１）は液晶、（２）はドライバ、（６）は光源、（７
）は受光器、（８）は最小判別器、（９）はレジスタ、
（１０）はＤ／Ａコンバータ、（１１）は加算器、（１
２）はＡ／Ｄコンバータ。
なお、図中、同−符−号は同一・又は相当部分を示す。
代 理 人 大 岩 増 雄第４図Fig. 1 is a system diagram of a liquid crystal display device according to an embodiment of the present invention, Fig. 2 is a transmission characteristic diagram of a TN type liquid crystal, Fig. 3 is a time chart according to an embodiment of the present invention, and Fig. 4 is a diagram of a conventional liquid crystal display device. 1 is a system diagram of a liquid crystal display device. (1) is liquid crystal, (2) is driver, (6) is light source, (7
) is the receiver, (8) is the minimum discriminator, (9) is the register,
(10) is a D/A converter, (11) is an adder, (1
2) is an A/D converter. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 4
Claims (1)
判別する判別手段と、上記透過率最低点における電圧値
を記憶する記憶手段と、上記電圧値に基づいて最適な基
準駆動電圧を設定し上記液晶のドライバに与える設定手
段とを備えたことを特徴とする液晶ディスプレイ装置。a determining means for testing the transmittance of the liquid crystal with respect to the drive voltage and determining the lowest transmittance point; a storage means for storing the voltage value at the lowest transmittance point; and a memory means for setting the optimum reference drive voltage based on the voltage value. A liquid crystal display device comprising: setting means for applying settings to the liquid crystal driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9922285A JPS61256382A (en) | 1985-05-10 | 1985-05-10 | Liquid crystal display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9922285A JPS61256382A (en) | 1985-05-10 | 1985-05-10 | Liquid crystal display unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61256382A true JPS61256382A (en) | 1986-11-13 |
Family
ID=14241632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9922285A Pending JPS61256382A (en) | 1985-05-10 | 1985-05-10 | Liquid crystal display unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61256382A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7098902B2 (en) | 2002-03-07 | 2006-08-29 | Seiko Epson Corporation | Display driver, electro-optical device, and method of setting display driver parameters |
| JP2007233353A (en) * | 2006-02-03 | 2007-09-13 | Semiconductor Energy Lab Co Ltd | Display device and electronic device having the display device |
| US8324920B2 (en) | 2006-02-03 | 2012-12-04 | Semiconductor Energy Laboratory Co., Ltd. | Display device including test circuit, and electronic apparatus having the display device |
-
1985
- 1985-05-10 JP JP9922285A patent/JPS61256382A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7098902B2 (en) | 2002-03-07 | 2006-08-29 | Seiko Epson Corporation | Display driver, electro-optical device, and method of setting display driver parameters |
| JP2007233353A (en) * | 2006-02-03 | 2007-09-13 | Semiconductor Energy Lab Co Ltd | Display device and electronic device having the display device |
| US8324920B2 (en) | 2006-02-03 | 2012-12-04 | Semiconductor Energy Laboratory Co., Ltd. | Display device including test circuit, and electronic apparatus having the display device |
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