TW535126B - Apparatus and method for automatic brightness control of liquid crystal display - Google Patents
Apparatus and method for automatic brightness control of liquid crystal display Download PDFInfo
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- TW535126B TW535126B TW090102917A TW90102917A TW535126B TW 535126 B TW535126 B TW 535126B TW 090102917 A TW090102917 A TW 090102917A TW 90102917 A TW90102917 A TW 90102917A TW 535126 B TW535126 B TW 535126B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
Description
535126 玫、發明說明 (發明說明應敘明：發明所屬之技術領域、先前技術、内容、實施方式及圖式簡單說明) [圖示之簡要說明] 圖1之鳥瞰圖，顯示出一般液晶顯示模組之結構。 圖2之方塊圖顯示傳統液晶顯示模組的亮度控制方法。 圖3之方塊圖顯示本發明較佳具體實施例之液晶顯示模 組的背光亮度控制方法。 圖4之圖形顯示出圖3中工作控制器及R-C電路所輸出 之可變亮度控制電壓的波形。 圖5之圖形顯示出根據圖3中工作控制器及R-C電路所 輸出之可變亮度控制電壓所決定出之照明燈亮度與照明 燈電流間的關係。 圖6之方塊圖是本發明第二較佳具體實施例之液晶顯示 模組的背光亮度控制方法。 圖7之圖形顯示圖6之液晶顯示模組執行背光亮度控制 後的結果以及其對比的情形。 圖8之圖形顯示圖6之液晶顯示模組執行背光亮度控制 後所產生之電力消耗的情形。 圖9之方塊圖是本發明第三較佳具體實施例之液晶顯示 模組的背光亮度控制方法。 圖1 0之方塊圖是本發明第四較佳具體實施例之液晶顯 535126 ⑴ 示模組的背光亮度控制方法。 圖11是圖1 〇中每一功能方塊圖的輸出波形。 圖1 2之流程圖顯示使用於液晶顯示模組之本發明自動 亮度控制法。 *圖示主要部份之標示 說明 1 0 ·液晶顯不面板 20 :閘驅動電路 3 0 :源極驅動電路 40，400:時序控制器 60 :背光 62 :反相器 64 :照明燈 66 :反射片 1 0 0 :液晶顯示模組 200 :電腦主體 420 :工作控制器 500 : R-C 電路 6 0 0 :合併電路 [發明之詳細說明] [發明目標] 7 0 0 :位準平移器 [發明領域及本發明相關之先前技藝] 本發明涉及液晶顯示（LCD)裝置，更特定言之，涉及使 用於液晶顯示裝置之自動亮度控制之裝置及方法。 圖1顯示一般液晶顯示模組100之結構。現參考圖1，液 晶顯示模組1 〇〇包含一用以顯示所有種類資訊之液晶顯示 模組面板10，該面板之兩玻璃基板間具有液晶物質；另包 含一具有驅動電路20，30，用以驅動液晶顯示模組面板10 (2)535126 之驅動部份，以及一闽以含山2、土，、 屋生控制信號以控制該驅動電路 2〇, 30之時序控制器4〇，一用以將光線導至液晶顯示模組 面板1〇之背光60,以及一用以裝納及保護液晶顯示模組面 板10與s光60兀件 < 基座（未顯示）。在像手提電腦，電視 機以及監視器這樣的系統中，一般均將該液晶顯示模組或 溥膜電晶體液晶顯示器（1^丁吨(::]0)用作顯示裝置。535126 Description of the invention (The description of the invention should state: the technical field to which the invention belongs, the prior art, the content, the embodiments and the brief description of the drawings) The structure of the group. FIG. 2 is a block diagram showing a brightness control method of a conventional liquid crystal display module. Fig. 3 is a block diagram showing a backlight brightness control method of a liquid crystal display module according to a preferred embodiment of the present invention. The graph of FIG. 4 shows the waveform of the variable brightness control voltage output by the work controller and the R-C circuit in FIG. 3. The graph in FIG. 5 shows the relationship between the brightness of the lighting lamp and the lamp current according to the variable brightness control voltage output by the working controller and the R-C circuit in FIG. 3. FIG. 6 is a block diagram of a backlight brightness control method of a liquid crystal display module according to a second preferred embodiment of the present invention. The graph of FIG. 7 shows the results after the backlight brightness control of the liquid crystal display module of FIG. 6 and the comparison situation. The graph in FIG. 8 shows the power consumption of the liquid crystal display module in FIG. 6 after the backlight brightness control is performed. FIG. 9 is a block diagram of a backlight brightness control method for a liquid crystal display module according to a third preferred embodiment of the present invention. FIG. 10 is a block diagram of a backlight brightness control method of a liquid crystal display 535126 display module of a fourth preferred embodiment of the present invention. FIG. 11 is an output waveform of each functional block diagram in FIG. The flowchart of FIG. 12 shows the automatic brightness control method of the present invention used in a liquid crystal display module. * The description of the main parts of the diagram 1 0 · LCD display panel 20: Gate drive circuit 3 0: Source drive circuit 40, 400: Timing controller 60: Backlight 62: Inverter 64: Illumination lamp 66: Reflection Tablet 1 0 0: LCD display module 200: Computer main body 420: Work controller 500: RC circuit 6 0 0: Combined circuit [Detailed description of the invention] [Invention target] 7 0 0: Level shifter [Field of invention and Prior art related to the present invention] The present invention relates to a liquid crystal display (LCD) device, and more particularly, to an apparatus and method for automatic brightness control of a liquid crystal display device. FIG. 1 shows a structure of a general liquid crystal display module 100. Referring now to FIG. 1, the liquid crystal display module 100 includes a liquid crystal display module panel 10 for displaying all kinds of information. The panel has a liquid crystal substance between two glass substrates; and it further includes a driving circuit 20, 30. To drive the driving part of the liquid crystal display module panel 10 (2) 535126, and a timing control controller 40 for controlling the driving circuit 20, 30 to control the driving circuit 20, 30. The backlight 60 directs light to the liquid crystal display module panel 10 and a base (not shown) for receiving and protecting the liquid crystal display module panel 10 and the s-light 60 element. In systems such as laptop computers, televisions, and monitors, this liquid crystal display module or TFT-LCD is generally used as a display device.
背光60包含反相器62，照明燈64(像是冷陰極照明管 (CCFT)或熱陰極照明管(HCFT))，以及多個用以將光線導 至前端之反射片66。背光6〇將照明燈M所發出的光線導至 液晶顯示面板10。液晶顯示面板1〇回應驅動電路2〇, Μ 所輸入 < 相對應於各像素的信號電壓，針對每一個像素， 以遮敝或通過背光6〇所發出光的方式，顯示彩色影像。The backlight 60 includes an inverter 62, a lighting lamp 64 (such as a cold cathode lighting tube (CCFT) or a hot cathode lighting tube (HCFT)), and a plurality of reflecting sheets 66 for directing light to the front end. The backlight 60 directs the light emitted from the illumination lamp M to the liquid crystal display panel 10. The liquid crystal display panel 10 responds to the input of the driving circuit 20, M < corresponding to the signal voltage of each pixel, and displays a color image for each pixel by blocking or emitting light from the backlight 60.
圖2之方塊圖顯示當該液晶顯示模組1〇〇用作為手提式 私細或桌上型私腦之顯示裝置時，控制其亮度的方法。手 提式％腦或桌上型電腦通常是以直流電驅動，而背光6 〇 則是藉由交流電發亮。是故，基本上液晶顯示模組1〇〇擁 有反相器6 2 ’以便如圖所示的將直流電壓轉換成交流電。 反相器62除了以已知方式將直流電壓轉換成交流電壓之 外 尚包含凋光電路（未顯示）以控制照明燈6 *之亮度。 參考圖2,運作中，當電腦使用者輸入亮度控制命令時， 電腦的中央處理單元（CPlJ)200就會產生控制亮度之亮度 -7- 535126 (3) 戀嘯 控制電壓CTL — V至該反相器62。反相器62之調光電路就會 根據該來自於中央處理單元CPU 200之亮度控制電壓 CTL — V來抑制照明燈64之電流，以控制背光60的亮度。舉 個例子，假設使用的是手提式電腦，則亮度控制電壓 CTL — V就會是在0-3.3伏。意即，當CTL —V為0伏時，亮度 最暗（黑），當CTL__V3.3伏時，亮度最暗（白）。FIG. 2 is a block diagram showing a method for controlling the brightness of the liquid crystal display module 100 when it is used as a display device for a portable personal computer or a desktop personal computer. Hand-held brain or desktop computers are usually driven by DC power, while backlight 60 is illuminated by AC power. Therefore, basically, the liquid crystal display module 100 has an inverter 6 2 ′ so as to convert a DC voltage to an AC power as shown in the figure. In addition to converting the DC voltage to the AC voltage in a known manner, the inverter 62 also includes a dimming circuit (not shown) to control the brightness of the lighting lamp 6 *. Referring to Figure 2, in operation, when a computer user enters a brightness control command, the computer's central processing unit (CPlJ) 200 will generate a brightness to control the brightness-7-535126 (3) Howling control voltage CTL — V to this reaction相 器 62。 Phaser 62. The dimming circuit of the inverter 62 will suppress the current of the lighting lamp 64 according to the brightness control voltage CTL-V from the central processing unit CPU 200 to control the brightness of the backlight 60. For example, if a laptop computer is used, the brightness control voltage CTL — V will be between 0 and 3.3 volts. This means that when CTL-V is 0 volts, the brightness is the darkest (black), and when CTL__V is 3.3 volts, the brightness is the darkest (white).
然而，此傳統液晶顯示模組100所使用的亮度控制法有 一特性，那就是一旦亮度受控，則無論液晶顯示模組1 0 0 所顯示之影像或圖框上之資料的性質是否有所不同，該受 控亮度的亮度值或亮度位準都不會改變。有一個問題會產 生，即在圖框的亮暗有變化，或圖框影像快速變更（像是 移動圖像）時，此亮度控制法為維持亮度的均勾，會消耗 不必要的電力。However, the brightness control method used in this conventional liquid crystal display module 100 has a characteristic that once the brightness is controlled, whether or not the nature of the image displayed on the liquid crystal display module 100 or the data on the frame is different , Neither the brightness value nor the brightness level of the controlled brightness will change. There is a problem that when the brightness of the frame changes, or the frame image changes rapidly (such as a moving image), this brightness control method maintains the uniformity of brightness and consumes unnecessary power.
[本發明之解決技術] 因此，針對液晶顯示模組之亮度自動控制，提供出一種 改良的裝置及方法，此改良的裝置及方法可自動地藉由控 制每個影像之工作率，達到自動控制每個影像亮度之目 的。此為本發明之目標。 本發明之另一目標是，針對液晶顯示模組之亮度自動控 制，提供出一種改良的裝置及方法，此改良的裝置及方法 可在不使影像衝突的清況下，要求使用者及自動亮度控制 535126 (4) 功能，適當地合併亮度控制功能。 本發明之另一目標是，針對液晶顯示模組之亮度自動控 制，提供出一種改良的裝置及方法，此改良的裝置及方法 可改良液晶顯示模組所顯亦的每個影像的對比。[Solution technology of the present invention] Therefore, an improved device and method are provided for the automatic control of the brightness of the liquid crystal display module. The improved device and method can automatically control the working rate of each image to achieve automatic control. The purpose of each image brightness. This is the object of the invention. Another object of the present invention is to provide an improved device and method for the automatic control of the brightness of a liquid crystal display module. The improved device and method can require the user and the automatic brightness without clearing the image conflict. Controls 535126 (4) functions and incorporates brightness control functions appropriately. Another object of the present invention is to provide an improved device and method for the automatic control of the brightness of a liquid crystal display module. The improved device and method can improve the contrast of each image displayed by the liquid crystal display module.
本發明之另一目標是，針對液晶顯示模組之亮度自動控 制，提供出一種改良的裝置及方法，此改良的裝置及方法 可根據每個影像之資料特徵來控制亮度，藉此降低液晶顯 示模組之所耗電力。 [本發明之建置及運作] 根據本發明，於液晶顯示模組中使用具有背光之自動控 制亮度之裝置，此背光包含控制信號產生裝置，此裝置接 收液晶顯示裝置上所顯示之影像資料，計算該影像資料之 平均灰階位準，以及產生正比於該灰階位準之亮度控制信 號，此自動亮度控制裝置另包含一反相器，其可回應該來 自於控制信號產生裝置之亮度控制信號，自動地控制該背 光的亮度。 根據本發明之另一方面，於液晶顯示模組中使用具有背 光之自動控制亮度之裝置，此背光包含第一控制信號產生 裝置，此裝置接收液晶顯示裝置上所顯示之影像資料，計 算該影像資料之平均灰階位準，以及產生正比於該灰階位 準之亮度控制信號，此背光另包含第二控制信號產生裝 535126 (5) I圓續頁 置，此裝置藉由使用者的操作，可產生第二亮度控制信 . 號，控制背光的亮度；此背光另包含第三控制信號產生裝 置，此裝置可回應該來自於第一及第二控制信號產生裝置 之第一及第二控制信號，產生第三亮度控制信號；以及一 反相器，此反相器可回應該來自於第三控制信號產生裝置 之第三亮度控制信號，控制該背光之亮度。 根據本發明之另一方面，提供出一種使用於液晶顯示裝 置，用以自動控制其亮度之方法，此方法包含之步騾：計 算該液晶顯示裝置上所顯示之影像資料的平均灰階位 準，回應該平均灰階位準，產生第一亮度控制信號，以及 回應第三亮度控制信號，控制該背光之亮度；此第三亮 度控制信號乃是回應該等來自於電腦主體之第一亮度控 制信號及第二亮度控制信號所產生。 [具體實施例] 現參考圖3至圖1 2，要更詳細地說明本發明；所示之為 本發明之較佳具體實施例。 本發明之液晶顯示裝置乃是根據工作率信號，自動地控 制背光的亮度，而此工作率信號則正比於該顯示於液晶顯 示裝置上之像素的平均灰階位準。 圖3之方塊圖顯示本發明液晶顯示模組之背光亮度控制 法其第一較佳具體實施例，此可應用在手提式電腦或桌上 -10- (6) __磉頁 ^ 參考圖3 ’該液晶顯示模組包含時序控制器4 〇 〇， 此&制备具有工作控制器42〇，可以1 Η時間（即一水平期） 、十具基準’计算出液晶顯示模組上所顯示之一個影像的 平均灰階位準，並產生出與該計算出之平均灰階位準值相 應之工作率信號DUTY;液晶顯示模組另包含一電路 5〇〇 ’將該來自於時序控制器400，以} H時間為計算基準 之工作率信號DUTY予以加總，加總超過1個圖框，然後 產生出一變動的亮度控制電壓Vduty，此電壓乃正比於所 顯示影像之灰階位準而變。與R-C電路500連接之反相器 62會回應該變動的亮度控制電壓Vduty，透過調光電路（未 顯示）限制照明燈之電流，以控制背光的亮度。以下參考 著附圖，將要詳細說明本發明之液晶顯示模組的運作。 首先，時序控制器400輸出1 Η時間之脈波。每一個脈波 之工作率均相對應於一個1 Η時間之像素資料的平均灰階 位準值。舉個例子，在具640個水平像素之VGA解析度之 液晶顯示模組中，右1 Η時間中之像素的灰階平均值為，， 黑色”等級，則會產生輸出值為像素時脈數（〇)高值之〇〇/。 工作率信號DUTY。若1 Η時間中之像素的灰階平均值為” 白色’’等級，則會產生輸出值為像素時脈數（6 4 0)高值之 10 0%工作率信號DUTY。同樣地，若1 Η時間中之像素的 灰階平均值為中間等級，則產生5 0 %工作率信號D。τ γ。 535126Another object of the present invention is to provide an improved device and method for automatically controlling the brightness of a liquid crystal display module. The improved device and method can control the brightness according to the data characteristics of each image, thereby reducing the liquid crystal display. Power consumed by the module. [Establishment and operation of the present invention] According to the present invention, a device for automatically controlling brightness with a backlight is used in a liquid crystal display module. The backlight includes a control signal generating device that receives image data displayed on the liquid crystal display device. Calculate the average gray level of the image data and generate a brightness control signal proportional to the gray level. This automatic brightness control device also includes an inverter that responds to the brightness control from the control signal generation device. Signal to automatically control the brightness of the backlight. According to another aspect of the present invention, a device for automatically controlling brightness with a backlight is used in a liquid crystal display module. The backlight includes a first control signal generating device. The device receives image data displayed on the liquid crystal display device and calculates the image. The average gray level of the data, and a brightness control signal that is proportional to the gray level. The backlight also includes a second control signal generating device 535126 (5) I circular page. This device is operated by the user. The second brightness control signal can be generated to control the brightness of the backlight. The backlight also includes a third control signal generating device, which can respond to the first and second controls from the first and second control signal generating devices. Signal to generate a third brightness control signal; and an inverter which can respond to the third brightness control signal from the third control signal generating device to control the brightness of the backlight. According to another aspect of the present invention, a method for automatically controlling the brightness of a liquid crystal display device is provided. The method includes the steps of: calculating an average gray level of image data displayed on the liquid crystal display device. In response to the average gray level, a first brightness control signal is generated, and a third brightness control signal is responded to control the brightness of the backlight; this third brightness control signal is in response to the first brightness control from the computer body And a second brightness control signal. [Specific embodiment] Now referring to Fig. 3 to Fig. 12, the present invention will be described in more detail; the preferred embodiment of the present invention is shown. The liquid crystal display device of the present invention automatically controls the brightness of the backlight according to the operating rate signal, and the operating rate signal is proportional to the average gray level of the pixels displayed on the liquid crystal display device. FIG. 3 is a block diagram showing the first preferred embodiment of the backlight brightness control method of the liquid crystal display module of the present invention, which can be applied to a portable computer or a table -10- (6) __ 磉 Page ^ Refer to FIG. 3 'The liquid crystal display module contains a timing controller 4 00, and this & preparation has a working controller 42 0, which can calculate the time displayed on the liquid crystal display module in 1 hour (ie, one horizontal period) and ten benchmarks'. The average grayscale level of an image, and a working rate signal DUTY corresponding to the calculated average grayscale level value is generated; the liquid crystal display module further includes a circuit 500 ′ from the timing controller 400 The working rate signal DUTY with} H time as the calculation basis is added up, and the sum exceeds 1 frame, and then a variable brightness control voltage Vduty is generated, which is proportional to the gray level of the displayed image. change. The inverter 62 connected to the R-C circuit 500 responds to the changing brightness control voltage Vduty, and limits the current of the lighting lamp through a dimming circuit (not shown) to control the brightness of the backlight. The operation of the liquid crystal display module of the present invention will be described in detail below with reference to the drawings. First, the timing controller 400 outputs a pulse of time of 1 Η. The working rate of each pulse wave corresponds to the average gray level value of the pixel data in a time frame. For example, in a liquid crystal display module with a VGA resolution of 640 horizontal pixels, the average gray level of the pixel in the right 1 h time is, "black" level, and the output value is the number of pixel clocks. (〇) High value of 〇 /. Working rate signal DUTY. If the average gray level of a pixel in a period of time is "white" level, the output value will be high in the number of pixel clocks (640) A value of 100% duty signal DUTY. Similarly, if the average gray level of a pixel in a period of time is a middle level, a 50% operating rate signal D is generated. τ γ. 535126
⑺ 表1及表2所示之工作率以百分比為單位，所使用的液晶 顯示模組具VGA解析度，水平像素數為64〇，1水平線之平 均灰階位準的等級數為丨6。具體地，表1所示的為伽瑪常 數等於1時之工作率，表2所示的則是伽瑪常數等於2.2時 之工作率。 [表1] 灰階 位準 0 1 2 1 J 4 5 6 7 8 9 10 11 12 13 14 15 責任 [%1 0 6.7 13.3 20 26.7 33.3 40.0 46.7 53.3 60.0 66.7 73,3 80.0 86.7 93.3 100 像素 時脈 [數目] 0 43 85 128 171 213 256 299 341 384 427 469 512 555 597 640 [表2] 灰階 位準 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 責任 [%1 0 0.3 1.2 2.9 5.5 8.9 13.3 18.7 25.1 32.5 41.0 50.5 61.2 73.0 85.9 100 像素 時脈 mm 0 2 8 19 35 57 85 120 161 208 262 323 392 467 550 640工作 The operating rates shown in Tables 1 and 2 are in percentage units. The liquid crystal display module used has VGA resolution and the number of horizontal pixels is 64. The average number of gray levels of 1 horizontal line is 6 . Specifically, Table 1 shows the operating rate when the gamma constant is equal to 1, and Table 2 shows the operating rate when the gamma constant is equal to 2.2. [Table 1] Gray level 0 1 2 1 J 4 5 6 7 8 9 10 11 12 13 14 15 Responsibility [% 1 0 6.7 13.3 20 26.7 33.3 40.0 46.7 53.3 60.0 66.7 73, 3 80.0 86.7 93.3 100 pixel clock [Number] 0 43 85 128 171 213 256 299 341 384 427 469 512 555 597 640 [Table 2] Gray scale level 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Liability [% 1 0 0.3 1.2 2.9 5.5 8.9 13.3 18.7 25.1 32.5 41.0 50.5 61.2 73.0 85.9 100 pixel clock mm 0 2 8 19 35 57 85 120 161 208 262 323 392 467 550 640
在表1及表2中，每一個工作率均以百分比的方式指出， 在1 Η時間裏具高值（像素的像素數。於是，時序控制器 400所產生之工作率信號DUTY所輸出之脈波，每一個具 高值數均根據1 η時間之像素資科平均灰階位準值，為表1 及表2所列之像素時脈數目。 為產生該工作率信號DUTY，時序控制器4〇〇之工作控 制器420包含一記憶體電阻，以計算i H時間中像素資料之 -12- 535126In Tables 1 and 2, each operating rate is indicated as a percentage, and has a high value (the number of pixels of a pixel in a period of time). Therefore, the pulses output by the operating rate signal DUTY generated by the timing controller 400 Wave, each with a high value is based on the pixel asset average gray level value of 1 η time, which is the number of pixel clocks listed in Table 1 and Table 2. To generate the operating rate signal DUTY, the timing controller 4 〇〇 The work controller 420 contains a memory resistance to calculate the pixel data in the i H time -12-535126
⑻⑻
平均灰階位準值。舉個例子，若情況是像素資料為4位元， 可指出16個等級，當i圖框之i水平線之灰階位準計算出來 時，首先是，工作控制器42〇每1 Η時間會刪除一次記憶體 電阻。然後，工作控制器420接收一條水平線之4位元像素 資料’並將其值與儲存在該記憶體電阻中之值加總，再將 加總的結果存入記憶體電阻中。然後，工作控制器42〇重 覆此加總動作直至最後一條水平線之4位元像素資料輸入 為止，即所有的水平線4位元像素資料均輸入為止。隨後， 在所有的1水平線之4位元像素資料均輸入之橡，工作控制 器420會產生1Η時間之工作率信號〇1]了丫，該工作率信號 DUTY輸出與如表i與表2之像素時鐘之數目/樣多之高 數值，其用掉該記憶電阻之高位置的4個位元。若是6或8 位兀之像素資料，可與8位元像素資料一樣來應用工作控 制器420中的工作控制操作原理。 如上所述’當工作控制器420產生相當於1 η時間灰階位 準之工作率仏號〇1;丁丫時，R_c電路5⑽就會將時序控制器 400所產生i工作率信號duty予以加總，超過1個圖框。 現在要詳細地說明R-C電路500。 、首先，假叹第一充電電壓為v〇，i H時間信號之振勳寬 度為VC，高位準期間為丁卜即時序控制器輸出高工作 率 4口就（D = T1/1 Η*ι〇〇。/、直 λ ττ + 〇/〇)每1 Η時間，LC電路500均會 -13- (9) (9)535126 ϋ出一個變動的亮度控制電昼vduty，此Vduty之數學式如 下： [數學式1]Average gray level value. For example, if the pixel data is 4 bits, 16 levels can be pointed out. When the gray level of the horizontal line of the i frame is calculated, first, the work controller 42 will be deleted every 1 h. Primary memory resistance. Then, the work controller 420 receives the 4-bit pixel data 'of a horizontal line and adds its value to the value stored in the memory resistance, and then stores the totalized result in the memory resistance. Then, the work controller 42 repeats this summing operation until the 4-bit pixel data of the last horizontal line is input, that is, all the 4-bit pixel data of the horizontal line is input. Subsequently, in the case where all the 4-bit pixel data of 1 horizontal line is input, the work controller 420 will generate a working rate signal of 1 time. The working rate signal DUTY is output as shown in Table i and Table 2. The high value of the number of pixel clocks / samples uses 4 bits of the high position of the memory resistor. In the case of 6-bit or 8-bit pixel data, the operation control operation principle in the work controller 420 can be applied in the same way as 8-bit pixel data. As described above, when the working controller 420 generates a working rate corresponding to 1 η time gray level level 101; Ding Ya, the R_c circuit 5⑽ will add the i working rate signal duty generated by the timing controller 400 to In total, more than 1 frame. The R-C circuit 500 will now be described in detail. First, let ’s assume that the first charging voltage is v0, the vibration width of the i H time signal is VC, and the high-level period is Ding Bu, that is, the timing controller outputs a high working rate of 4 (D = T1 / 1 Η * ι 〇〇。 /, straight λ ττ + 〇 / 〇) every 1 Η time, the LC circuit 500 will -13- (9) (9) 535126 a variable brightness control day vduty, the mathematical formula of this Vduty is as follows : [Mathematical formula 1]
Vduty=^ Vo + (Vc-V〇)x[1.EXP[-T1/(Rx C)]] }x£SP [(Tl-l H)/(Rx 〇] 從式中可明顯看出，該用以控制背光亮度之變動亮度控 制電壓Vduty，其電壓位準正比於該時序控制器4〇〇所產生 之工作率仏號之高信號期間τ丨，而該變動亮度控制電壓Vduty = ^ Vo + (Vc-V〇) x [1.EXP [-T1 / (Rx C)]]} x £ SP [(Tl-l H) / (Rx 〇) It can be clearly seen from the formula that The variable brightness control voltage Vduty for controlling the brightness of the backlight has a voltage level that is proportional to the high signal period τ 丨 of the operating rate 仏 generated by the timing controller 400, and the variable brightness control voltage
Vduty的響應時間則是由r_c電路5〇〇之rc時間常數來決 定。 ' 圖4顯示圖3之工作控制器42〇及R_c電路5〇〇所輸出之 欠動冗度控制電壓Vduty的波形。參考圖4，曲線圖工及二 刀別顯不在RC時間常數為1 Η時間十倍時，變動亮度控制 私壓Vduty< 〇_15灰階位準（工作1〇〇%)及中間灰階位準 (工作M%)。在此情況中，變動亮度控制電壓以在5〇 Η k到飽和狀態。這意謂著5〇 Η之位元率乃由RC時間常 數決定。 圖5顯示照明燈64之電流與亮度間的線性關係，此關係 :依據來自圖3所示之工作控制器42。及R_c電路5〇。之該 I又動梵度控制電壓Vduty來決定。參考圖5，當輸出自_c '路5〇0之該可變動亮度控制電壓Vduty作為背光反相器 -14- (10) (10)535126 62<輸入電壓時，該反相器62會產生相應於該變動亮度控 制電壓Vduty之電流。背光的亮度正比於此電流量。從圖 中的關係明顯可看出，本發明之液晶顯示模組可自動地控 制一個影像之工作率，產生可變動亮度控制電壓乂仏矽， 而此邊動焭度控制電壓Vduty則透過反相器62控制著照明 燈64之電流，自動地控制背光的亮度。 如上所述’本發明之液晶顯可示模組的亮度控制功能可 經由使用者的要求而執行，亦可自動地針對每個影像來執 行。為達此’本發明之液晶顯示模組包含一合併電路，可 在使兩控制功能不衝突的情況下予以合併。現要說明的是 具有合併電蹈之液晶顯示模組的構造。 圖6之方塊圖顯示當液晶顯示模組用作為手提式電腦或 桌上型電腦之顯示裝置時，本發明對其之背光亮度控法之 第二具體實施例。參考該圖，此圖中除了合併電路600之 外，圖6所示之L C D模組之組合與圖3所示之液晶顯示模組 完全相同；該合併電路600可回應電腦之主體200所產生之 亮度控制電壓CTL_V&該時序控制器400内之工作控制器 420所產生之工作率信號DUTY，產生變動之亮度控制電 壓至R-C電路500。於是，為方便說明，通篇中相同的數 字代表功能相同之區塊。同樣的區塊將不再重覆說明。 合併電路600包括一第一電晶體T1，其具有一透過電阻 -15- 535126The response time of Vduty is determined by the rc time constant of the r_c circuit 500. 'FIG. 4 shows the waveforms of the under-duty redundancy control voltage Vduty output by the work controller 42 and the R_c circuit 500 of FIG. 3. Referring to Fig. 4, when the RC time constant of the graph and the two knives do not show up when the RC time constant is 1 Η time ten times, change the brightness control private pressure Vduty < 〇_15 gray level (working 100%) and the middle gray level Standard (work M%). In this case, the brightness control voltage is varied to reach a saturation state at 50 Η k. This means that the bit rate of 50〇 is determined by the RC time constant. FIG. 5 shows a linear relationship between the current and the brightness of the lighting lamp 64. This relationship is based on the work controller 42 shown in FIG. And R_c circuit 50. The I is determined by the Vduty control voltage Vduty. Referring to FIG. 5, when the variable brightness control voltage Vduty outputted from _c 'circuit 500 is used as a backlight inverter -14- (10) (10) 535126 62 < input voltage, the inverter 62 will generate A current corresponding to the variable brightness control voltage Vduty. The brightness of the backlight is proportional to this amount of current. It can be clearly seen from the relationship in the figure that the liquid crystal display module of the present invention can automatically control the working rate of an image to generate a variable brightness control voltage (silicon), and the side-to-side control voltage Vduty is inverted The device 62 controls the current of the lighting lamp 64 and automatically controls the brightness of the backlight. As described above, the brightness control function of the liquid crystal display and display module of the present invention can be executed by a user's request, and can also be automatically executed for each image. To achieve this, the liquid crystal display module of the present invention includes a merging circuit, which can be merged without causing the two control functions to conflict. The structure of a liquid crystal display module with integrated circuits will now be described. FIG. 6 is a block diagram showing a second specific embodiment of the backlight brightness control method of the present invention when the liquid crystal display module is used as a display device of a portable computer or a desktop computer. Referring to the figure, except for the combination circuit 600 in this figure, the combination of the LCD module shown in FIG. 6 is exactly the same as the liquid crystal display module shown in FIG. 3; the combination circuit 600 can respond to the generated by the main body 200 of the computer. Brightness control voltage CTL_V & The operating rate signal DUTY generated by the work controller 420 in the timing controller 400 generates a variable brightness control voltage to the RC circuit 500. Therefore, for the convenience of explanation, the same numbers throughout the text represent blocks with the same functions. The same blocks will not be repeated. Merging circuit 600 includes a first transistor T1, which has a transmission resistance -15-535126
(π) R3連接至時序控制器400以接收以1 Η時間為單位之工作 率信號DUTY之基極；一連接到該R-C電路500之輸入端之 射極；以及一接收該來自於電腦主體200之亮度控制電壓 之集極。射極則透過電阻R2連接至地。該第一電晶體T 1 是NPN電晶體。此處應注意的是，此合併電路使用第一電 晶體T 1僅為說明之用，其他的電路元件，像是N型互補式 金氧半及運算放大器依電路之設計，也是可以使用的。 合併電路600之第一電晶體T1的作用為一閘電路，用以 接收電腦之主體200所產生之亮度控制電壓CTL — V及該工 作控制器420所產生之工作率信號DUTY，並選擇性地於 工作率信號DUTY為高位準時，將該亮度控制電壓CTL_V 輸出至R-C電路500。該R-C電路500接收該選擇性所輸出 之亮度控制電壓CTL_V對其中之電容C1充電，所充電壓 則成為變動亮度控制電壓Vduty。此處應注意的是，電腦 主體200所產生之該亮度控制電壓電壓範圍可由 使用者自由設定，該透過R-C電路500所輸出之變動亮度 控制電壓Vduty的電位則隨著液晶顯示器上所顯示影像之 灰階位準而變動。 舉個例子，當電腦主體200產生2伏之亮度控制電壓 CTL_V輸出至該第一電晶體T1之集極時，合併電路600會 回應第一電晶體T1基極處所接收之工作率信號DUTY，輸 -16- 535126(π) R3 is connected to the timing controller 400 to receive the base of the operating rate signal DUTY in units of 1 Η time; an emitter connected to the input of the RC circuit 500; and a receiver to receive the signal from the computer body 200. The collector of the brightness control voltage. The emitter is connected to ground through resistor R2. The first transistor T 1 is an NPN transistor. It should be noted here that the use of the first transistor T 1 in this combination circuit is for illustration purposes only. Other circuit components, such as N-type complementary metal-oxide-semiconductor and operational amplifiers, can also be used in accordance with the circuit design. The first transistor T1 of the merging circuit 600 functions as a gate circuit for receiving the brightness control voltage CTL-V generated by the main body 200 of the computer and the operating rate signal DUTY generated by the working controller 420, and selectively When the operating rate signal DUTY is at a high level, the brightness control voltage CTL_V is output to the RC circuit 500. The R-C circuit 500 receives the selectively output brightness control voltage CTL_V to charge the capacitor C1 therein, and the charged voltage becomes the variable brightness control voltage Vduty. It should be noted here that the brightness control voltage voltage range generated by the computer body 200 can be freely set by the user, and the potential of the variable brightness control voltage Vduty output through the RC circuit 500 varies with the image displayed on the liquid crystal display. The gray level changes. For example, when the computer main body 200 generates a 2 volt brightness control voltage CTL_V and outputs it to the collector of the first transistor T1, the merge circuit 600 will respond to the operating rate signal DUTY received at the base of the first transistor T1. -16- 535126
(12) 出一 ：¾度控制電壓CTL — V。藉著該選擇性地視工作率信號 DUTY的情況而輸出之亮度控制電壓ctl —v，R-C電路500 之電谷器C1因而充電。所充之〇至2伏的電壓則成為變動 梵度控制電壓Vduty。另外，當電腦主體200產生1伏之亮 度控制電壓CTL一V輸出至該第一電晶體T1之集極時，該合 併電路6 0 0則會回應第一電晶體τ丨基極處所接收之工作 率信號DUTY，透過R-C電路500,輸出一 〇至1伏之亮度控 制電壓C T L V。 該輸入至第一電晶體T1之工作率信號DUTY不僅僅是 了以在時序控制為400處產生，也可以在液晶顯不面板或 電腦主體200中之圖形控制器（未顯示）處產生。於是，該 合併電路600除了可以置於液晶顯示模組中反相器62之電 路基板中外，也可以置於液晶顯示面板中或電腦主體200 中。 圖7之圖表顯示出圖6所示之液晶顯示模組所執行之背 光亮度控制結果及對比顯示結果；圖8之圖表則顯示圖6 所示LCD模組執行背光亮度控制後之所耗電力。 參考圖7，令人激賞的是，本發明液晶顯示模式執行背 光亮度控制後，像，，黑色”部份之暗影像其亮度低於傳統技 術所做出的亮度，像，，白色”部份之亮影像其亮度與傳統技 術所做出的亮度相同，且黑與白的對比明顯高於傳統技術 -17- 535126(12) Output 1: ¾ degree control voltage CTL — V. As a result of the brightness control voltage ctl-v selectively outputted depending on the operating rate signal DUTY, the valley C1 of the R-C circuit 500 is thus charged. The charged voltage of 0 to 2 volts becomes the variable Vandy control voltage Vduty. In addition, when the computer main body 200 generates a brightness control voltage CTL-V of 1 volt and outputs it to the collector of the first transistor T1, the combining circuit 6 0 0 will respond to the work received at the base of the first transistor τ 丨The rate signal DUTY, through the RC circuit 500, outputs a brightness control voltage CTLV of 10 to 1 volt. The duty ratio signal DUTY input to the first transistor T1 is not only generated at the timing control of 400, but also can be generated at a liquid crystal display panel or a graphics controller (not shown) in the computer body 200. Therefore, in addition to being incorporated in the circuit substrate of the inverter 62 in the liquid crystal display module, the combining circuit 600 can also be placed in the liquid crystal display panel or the computer body 200. The graph in FIG. 7 shows the backlight brightness control results and comparative display results performed by the liquid crystal display module shown in FIG. 6; the graph in FIG. 8 shows the power consumption after the LCD module shown in FIG. 6 performs backlight brightness control. Referring to FIG. 7, it is encouraging that after the backlight brightness control of the liquid crystal display mode of the present invention is performed, the brightness of the dark image of “image, black” portion is lower than that of the traditional technology, such as “white” portion. The brightness of the bright image is the same as that made by traditional technology, and the contrast between black and white is significantly higher than that of traditional technology-17-535126
(13) 所做出的對比。因此，在本發明液晶顯示模組之黑與白對 比更顯著，所顯示出的影像更自然。(13) The comparison made. Therefore, the black and white contrast of the liquid crystal display module of the present invention is more prominent, and the displayed image is more natural.
參考圖8，本發明在顯示”黑色π及’’白色”時，所損耗的 電力較傳統的技術少了 2.2瓦，而在顯示代表一般影像之” 鑲嵌圖案’’時，本發明所損耗的電力較傳統的技術少了 〇. 9 瓦。是故，由於本發明之液晶顯示模組包含合併電路600， 所以每一個影像的亮度可以在電腦主體200所決定之亮度 控制電壓範圍内接受控制。 或者，可以用ΡΝΡ型電晶體來取代合併電路600之該 ΝΡΝ型電晶體Τ1。以ΡΝΡ型電晶體為構成元件之電路示於Referring to FIG. 8, when the present invention displays “black π and“ white ”, the power consumption is 2.2 watts less than that of the conventional technology, and when displaying a“ mosaic pattern ”representing a general image, the present invention consumes less power. Electricity is 0.9 watts less than the conventional technology. Therefore, since the liquid crystal display module of the present invention includes a merging circuit 600, the brightness of each image can be controlled within the brightness control voltage range determined by the computer body 200. Alternatively, the PN-type transistor T1 of the merge circuit 600 may be replaced with a PN-type transistor. A circuit using the PN-type transistor as a constituent element is shown in
圖9之方塊圖顯示當液晶顯示模組用作為手提式電腦或 桌上型電腦之顯示裝置時，本發明對其之背光亮度控法之 第三具體實施例。參考該圖，圖中之液晶顯示模組除了合 併電路600’以ΡΝΡ型電晶體取代了合併電路600中之ΝΡΝ 型電晶體Τ1，以及R-C電路500’多了一個R6連接至輸出之 外，其餘構造均與圖6所示之完全相同。於是，為方便說 明，通篇中相同的數字代表功能相同之區塊。同樣的區塊 將不再重覆說明。 合併電路600’包含一第二電晶體Τ2’此電晶體之射極透 過電阻R4，接收該來自於電腦主體200之亮度控制電壓； -18- 535126 發_諕_磺頁‘ (14) 其基極則透過電阻R7，連接至時序控制器400，接收以1 Η 時間為單位之工作率信號DUTY ;該第一電晶體Τ2之集極 則連接至地。該第二電晶體T2之射極連接至R-C電路500’ 之輸入端。Fig. 9 is a block diagram showing a third embodiment of the backlight brightness control method of the present invention when the liquid crystal display module is used as a display device of a portable computer or a desktop computer. Referring to the figure, the liquid crystal display module in the figure except that the merging circuit 600 'replaces the PN-type transistor T1 in the merging circuit 600 with the PN-type transistor, and the RC circuit 500' has one more R6 connected to the output. The structures are all the same as those shown in FIG. 6. Therefore, for the convenience of explanation, the same numbers throughout the text represent blocks with the same functions. The same blocks will not be repeated. The merging circuit 600 'includes a second transistor T2', the emitter of this transistor receives the brightness control voltage from the computer body 200 through the resistor R4; -18- 535126 sends _ 諕 _sulfur page '(14) its base The electrode is connected to the timing controller 400 through the resistor R7, and receives the operating rate signal DUTY in units of 1 Η time; the collector of the first transistor T2 is connected to the ground. The emitter of the second transistor T2 is connected to the input terminal of the R-C circuit 500 '.
合併電路600’之第二電晶體T2的作用為一閘電路，用以 接收電腦之主體2 0 0所產生之亮度控制電壓C T L_V以及該 工作控制器420所產生之工作率信號DUTY，並選擇性地 於工作率信號DUTY為高位準時，將該亮度控制電壓 CTL V輸出至R-C電路500’。該R-C電路500’接收該合併電 路600’所選擇性輸出之亮度控制電壓CTL_V，對其中之電 容C2充電，所充電壓則成為變動亮度控制電壓Vduty。應 注意的是，電腦主體200所產生之該亮度控制電壓CTL_V 的電壓範圍可由使用者自由設定，而該透過R-C電路500’ 所輸出之變動亮度控制電壓Vduty其電位則隨著液晶顯示 器上所顯示影像之灰階位準而變動。連接至R-C電路500’ 輸出端之電阻R6，其以所給之比率分配經由R-C電路500’ 所輸出之Vduty。 此處應注意的是，此合併電路之第二電晶體T i為P N P電 晶體僅為說明之用，其他的電路元件，像是N型互補式金 氧半及運算放大器依電路之設計，也是可以使用的。 不過，在上述之液晶顯示模組中，當電腦主體2 00所產 -19- 535126The second transistor T2 of the combining circuit 600 'functions as a gate circuit for receiving the brightness control voltage CT L_V generated by the main body 2 of the computer and the operating rate signal DUTY generated by the working controller 420, and selecting When the operating rate signal DUTY is at a high level, the brightness control voltage CTL V is output to the RC circuit 500 '. The R-C circuit 500 'receives the brightness control voltage CTL_V selectively output by the combined circuit 600', charges the capacitor C2 therein, and the charged voltage becomes the variable brightness control voltage Vduty. It should be noted that the voltage range of the brightness control voltage CTL_V generated by the computer body 200 can be freely set by the user, and the potential of the variable brightness control voltage Vduty output through the RC circuit 500 'is displayed on the liquid crystal display. The gray level of the image changes. The resistor R6 connected to the output terminal of the R-C circuit 500 'distributes the Vduty output through the R-C circuit 500' at a given ratio. It should be noted here that the second transistor T i of this combined circuit is a PNP transistor for illustration purposes only. Other circuit components, such as N-type complementary metal-oxide semiconductors and operational amplifiers, are also designed according to the circuit. usable. However, in the above-mentioned liquid crystal display module, when the computer main body 2 00 produced -19- 535126
⑼ 生之0伏的亮度控制電蜃c τ L一 V輸出時，由於該第二電晶 體T2之基射電壓Vbe之故，並不會有0伏之變動亮度控制 電壓Vduty輸出至r_c電路500’。於是，為去除基射電壓 V b e的干擾，在該液晶顯示裝置中應加入一位準平移器， 如圖1 0所示。 圖10之方塊圖顯示當液晶顯示模組用作為手提式電腦 或桌上型電腦之顯示装置時，本發明對其之背光亮度控法 之第四具體實施例。參考該圖，圖中之液晶顯示模組除了 在時序控制器400與合併電路600*之間多加了一個位準平 移器700之外，其餘構造均與圖9所示之完全相同。於是， 為方便說明，通篇中相同的數字代表功能相同之區塊。同 樣的區塊將不再重覆說明。When the 0 volt brightness control voltage 蜃 c τ L-V is output, there is no change of 0 volt brightness control voltage Vduty to the r_c circuit 500 due to the base emission voltage Vbe of the second transistor T2. '. Therefore, in order to remove the interference of the base emission voltage V b e, a quasi-translator should be added to the liquid crystal display device, as shown in FIG. 10. Fig. 10 is a block diagram showing a fourth embodiment of the backlight brightness control method of the present invention when the liquid crystal display module is used as a display device of a portable computer or a desktop computer. Referring to the figure, the liquid crystal display module in the figure is exactly the same as that shown in FIG. 9 except that a level shifter 700 is added between the timing controller 400 and the merging circuit 600 *. Therefore, for the convenience of explanation, the same numbers throughout the text represent blocks with the same functions. The same blocks will not be repeated.
位準平移器700包含一 NPN型式之第三電晶體T3，此電 晶體之射極連接至合併電路600’之輸入端，基極透過電阻 R8連接至時序控制器400，集極則連接至電源電壓v^_ ； 位準平移器7〇〇另包含一電阻R9，其一端連接至射極；位 準平移器7〇〇另包含一二極體，連接於電阻的另一端及 地痛（或泉）之間，以及包含一電阻R 1 0，連接於電阻r 9 的另一端及電晶體的關閉 位準平移器700在地端 電壓Voff端。 二極體D1、電阻R9、R10及電 晶體之關閉電壓Voff(譬如 低於-5伏之電壓）所形成的電 -20- 535126The level shifter 700 includes a third transistor T3 of the NPN type. The emitter of this transistor is connected to the input of the combining circuit 600 ', the base is connected to the timing controller 400 through the resistor R8, and the collector is connected to the power supply. Voltage v ^ _; level shifter 700 also includes a resistor R9, one end of which is connected to the emitter; level shifter 700 also includes a diode, connected to the other end of the resistor and ground pain (or Spring), and includes a resistor R 1 0, connected to the other end of the resistor r 9 and the off-level translator 700 of the transistor at the ground terminal voltage Voff. Electricity formed by diode D1, resistors R9, R10, and the off voltage Voff of the transistor (for example, a voltage lower than -5 volts) -20-535126
(16) 流路徑上，產生與第三電晶體丁3之基射電壓Vbe相同之下 降電壓，並將此下降電壓提供至該第三電晶體T3之射極 端及電阻R9之一端子。於是，合併電路6〇〇，之電晶體Τ2 就可全擺動，如此一來在所輸出的亮度控制電壓Ctl_V 是〇伏時，R- C電路5 00 ’所接收到的亦為〇伏變動亮度控制 電壓Vduty。(16) On the current path, the same drop voltage as the base emitter voltage Vbe of the third transistor D3 is generated, and this drop voltage is supplied to the emitter terminal of the third transistor T3 and one terminal of the resistor R9. Therefore, the combination circuit 600, the transistor T2 can fully swing, so that when the output brightness control voltage Ctl_V is 0 volts, the R-C circuit 5 00 'receives a 0 volt fluctuation brightness. Control voltage Vduty.
參考顯示有每一節點之輸出波形之圖1丨，將要說明的是 具有位準平移器700之液晶顯示模組的運作。首先，時序 制器400產生出0至3伏之工作率信號DUTY，輸出至位 準平移器700。在工作率信號DUTY為0伏時，位準平移器 700輸出一個-0.6伏（即- Vbe)之位準平移電壓vshi ft，而在Referring to FIG. 1 which shows the output waveform of each node, the operation of a liquid crystal display module having a level shifter 700 will be explained. First, the timing controller 400 generates an operating rate signal DUTY of 0 to 3 volts and outputs it to the level shifter 700. When the operating rate signal DUTY is 0 volts, the level shifter 700 outputs a level shift voltage vshi ft of -0.6 volts (ie-Vbe), and
工作率信號DUTY為3伏（即等於電源電壓^ VDD之位準） 時，位準平移器700就會輸出一個3伏-vbe，即24伏之位 準平移電壓Vshift。意即，位準平移器7〇〇會回應該〇至3 伏之工作率信號DUTY ,產生出·〇·6至24伏之位準平移電 壓 Vshift。 接下來，該位準平移器700所產生之位準平移電壓 Vshift會被輸入至該具有PNP電晶體丁2、R_c電路5〇〇，之合 併电路600 然後輸出一變動亮度控制電壓vduty。舉個 例子’當所輸入的位準平移電壓又讣出是-〇6伏（即-Vbe) 時，PNP電晶體T2之射極電位就會成為 -21 . (17)535126When the operating rate signal DUTY is 3 volts (that is, equal to the power supply voltage ^ VDD level), the level shifter 700 will output a 3 volt-vbe, which is a level shift voltage Vshift of 24 volts. In other words, the level shifter 700 will respond to the working rate signal DUTY of 0 to 3 volts, and generate a level shifting voltage Vshift of 0.6 to 24 volts. Next, the level shift voltage Vshift generated by the level shifter 700 is input to the PNP transistor D2, R_c circuit 500, the combination circuit 600, and then outputs a variable brightness control voltage vduty. For example, when the input level shifting voltage is again -06 volts (ie -Vbe), the emitter potential of the PNP transistor T2 will become -21. (17) 535126
_〇.6V(-Vbe) + Vbe，而輸出一個〇伏之亮度控制電签 CTL — V’；當所輸入的位準平移電壓Vshif^ _2 4伏時，ρ⑽_〇.6V (-Vbe) + Vbe, and output a 0 volt brightness control CTL — V ’; when the input level translation voltage Vshif ^ _2 4 volts, ρ⑽
電晶體丁2就會輸出一個3伏之亮度控制電壓CTL一V，至r气 電路500’。PNP電晶體T2之射極電壓CTL-V，（即電腦主髀 2 0 0所產生之壳度控制電壓）會被c電路5 〇 〇，充電，然後 輸出為一變動亮度控制電壓Vduty。該變動亮度控制電签 Vduty會輸出至反相器62，以控制背光的亮度。在圖丨丨之 射極電壓CTL一V，圖中，虛線所代表的是可由使用者控制 的亮度控制電壓的範圍。於是，背光的亮度可自動地控制 在某些範圍之内。 圖1 2之流程圖顯示本發明之液晶顯示模組自動亮度枘 制法。參考圖1 2，時序控制器4 〇 〇之工作控制器4 2 0針對一 個影像中所顯示之每一個像素的資料，以一條線1 H為一 個早位’计算灰階位準之平均值（S 1 〇)。然後，工作控制 器420產生相稱於該平均灰階位準之工作率信號DUTY， 輸出至合併電路600(S12)。然後，合併電路600回應該工 作率k號DUTY及電腦主體2〇〇所產生之亮度控制電譽， 產生出變動亮度控制電壓Vduty，最後，反相器62接收該 變動亮度控制電壓Vduty以自動地控制背光的亮度（S 14)。 所以，本發明之液晶顯示模組合併了時序控制器4〇〇之 工作控制器420所產生之工作率信號DUTY及使用者所設 -22- 535126 (18) 發_説_續頁 定之由 動地控 示模組 降低。 在圖 施例，3 之為限 [本發明 本發 控制每 另外 及每個 合併。 另外 對比， 電腦主體200所產生之亮度控制電壓CTL_V，以自 制背光的：¾度。結果’如圖7及圖8所’該液晶顯 中所顯示之每個影像的對比可改良，電源損耗也可 式及說明書中已揭示了本發明典型之較佳具體實 择然使用了特定的名詞，但其意是一般性的，非以 ，本發明之範圍敘述於下列之專利範圍中。 之效果] 明可自動地針對每個影像控制工作率，藉以自動地 個影像之亮度。 ，本發明可適當地將使用者所要求之亮度控制功能 影像之自動亮度控制功能在不衝突的情況下予以 ，本發明可改善液晶顯示模組所顯示之每個影像的 降低液晶顯示模組的電源消耗。The transistor D2 will output a brightness control voltage CTL-V of 3 volts to the r-gas circuit 500 '. The emitter voltage CTL-V of the PNP transistor T2 (that is, the shell control voltage generated by the computer's main unit 200) will be charged by the c circuit 5 00, and then output as a variable brightness control voltage Vduty. The variable brightness control electric tag Vduty is output to the inverter 62 to control the brightness of the backlight. In the figure, the emitter voltage CTL-V. In the figure, the dotted line represents the range of the brightness control voltage that can be controlled by the user. Thus, the brightness of the backlight can be automatically controlled within a certain range. The flowchart of FIG. 12 shows the automatic brightness control method of the liquid crystal display module of the present invention. Referring to FIG. 12, the working controller 4 2 0 of the timing controller 4 00 calculates the average value of the grayscale level based on the data of each pixel displayed in an image, using a line 1 H as an early bit ( S 1 〇). Then, the operation controller 420 generates an operation rate signal DUTY corresponding to the average gray level, and outputs it to the combining circuit 600 (S12). Then, the merging circuit 600 responds to the brightness control electric reputation generated by the duty ratio k number DUTY and the computer body 2000 to generate a variable brightness control voltage Vduty. Finally, the inverter 62 receives the variable brightness control voltage Vduty to automatically Control the brightness of the backlight (S 14). Therefore, the liquid crystal display module of the present invention combines the working rate signal DUTY generated by the working controller 420 of the timing controller 400 and the user-set -22-535126 (18) Ground control display module lowered. In the embodiment of the figure, the limit of 3 is [the present invention, the present invention controls every other and every merge. In addition, in contrast, the brightness control voltage CTL_V generated by the computer body 200 is customized by the backlight: ¾ degree. As a result, as shown in FIG. 7 and FIG. 8, the contrast of each image displayed in the liquid crystal display can be improved, the power loss can also be expressed, and the specification has revealed that the present invention is typically better and more specific. Actually, a specific Nouns, but their meanings are general, and the scope of the present invention is described in the following patents. Effect] It can automatically control the work rate for each image, so as to automatically the brightness of each image. The present invention can appropriately apply the automatic brightness control function of the brightness control function image requested by the user without conflict. The present invention can improve the reduction of each image displayed by the liquid crystal display module. Power consumption.
-23--twenty three-
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7852312B2 (en) | 2004-06-30 | 2010-12-14 | Lg Display Co., Ltd. | System for controlling driving lamp of backlight unit |
| US8120569B2 (en) | 2006-09-15 | 2012-02-21 | Au Optronics Corp. | Apparatus and method for adaptively adjusting backlight |
| US8330704B2 (en) | 2007-01-26 | 2012-12-11 | Au Optronics Corporation | Backlight control method for high dynamic range LCD |
| TWI393104B (en) * | 2007-07-13 | 2013-04-11 | Lg Display Co Ltd | Liquid crystal display device and driving method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100388582B1 (en) * | 2001-02-19 | 2003-06-25 | (주)플렛디스 | Image Quality Control Method of Flat Panel Display |
| KR100464964B1 (en) * | 2002-06-26 | 2005-01-06 | 삼성전기주식회사 | Self-active type back light inverter for LCD |
| KR100467592B1 (en) * | 2002-07-15 | 2005-01-24 | 삼성전자주식회사 | Apparatus and method for display |
| US7154468B2 (en) * | 2003-11-25 | 2006-12-26 | Motorola Inc. | Method and apparatus for image optimization in backlit displays |
| KR100686121B1 (en) * | 2005-01-18 | 2007-02-23 | 엘지전자 주식회사 | Apparatus for controlling brightness display device and method for controlling brightness using the same |
| KR100743759B1 (en) * | 2005-09-07 | 2007-07-30 | 엘지전자 주식회사 | Apparatus and Method for controlling dynamic contrast ratio using peak level |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0634946A (en) * | 1992-07-17 | 1994-02-10 | Hitachi Ltd | Back light unit |
| KR100191730B1 (en) * | 1995-12-22 | 1999-06-15 | 구자홍 | Automatic controller for screen brightness of liquid crystal display device |
| KR19990016122A (en) * | 1997-08-13 | 1999-03-05 | 윤종용 | LCD panel driving method |
| KR100299967B1 (en) * | 1999-01-26 | 2001-09-26 | 윤종용 | Apparatus for controlling light capacity in liquid crystal display projection television |
-
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7852312B2 (en) | 2004-06-30 | 2010-12-14 | Lg Display Co., Ltd. | System for controlling driving lamp of backlight unit |
| US8120569B2 (en) | 2006-09-15 | 2012-02-21 | Au Optronics Corp. | Apparatus and method for adaptively adjusting backlight |
| US8330704B2 (en) | 2007-01-26 | 2012-12-11 | Au Optronics Corporation | Backlight control method for high dynamic range LCD |
| US8593394B2 (en) | 2007-01-26 | 2013-11-26 | Au Optronics Corporation | Backlight control method for high dynamic range LCD |
| TWI455085B (en) * | 2007-01-26 | 2014-10-01 | Au Optronics Corp | Backlight control method for high dynamic range lcd |
| TWI393104B (en) * | 2007-07-13 | 2013-04-11 | Lg Display Co Ltd | Liquid crystal display device and driving method thereof |
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| KR100777347B1 (en) | 2007-11-20 |
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