WO2005098808A1 - Circuit d'attaque de diode electroluminescente organique a matrice active pouvant regler dynamiquement la balance des blancs et procede de reglage de ce circuit - Google Patents

Circuit d'attaque de diode electroluminescente organique a matrice active pouvant regler dynamiquement la balance des blancs et procede de reglage de ce circuit Download PDF

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Publication number
WO2005098808A1
WO2005098808A1 PCT/CN2004/000315 CN2004000315W WO2005098808A1 WO 2005098808 A1 WO2005098808 A1 WO 2005098808A1 CN 2004000315 W CN2004000315 W CN 2004000315W WO 2005098808 A1 WO2005098808 A1 WO 2005098808A1
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WO
WIPO (PCT)
Prior art keywords
active matrix
matrix organic
emitting diode
light emitting
organic light
Prior art date
Application number
PCT/CN2004/000315
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English (en)
French (fr)
Inventor
Yishu Li
Original Assignee
Quanta Display Inc.
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Quanta Display Inc. filed Critical Quanta Display Inc.
Priority to PCT/CN2004/000315 priority Critical patent/WO2005098808A1/zh
Publication of WO2005098808A1 publication Critical patent/WO2005098808A1/zh

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Classifications

    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Definitions

  • the invention relates to an active matrix organic light emitting diode (AMOLED) driving control circuit, and in particular to an active matrix organic light emitting diode driving control circuit and adjustment capable of dynamically adjusting white balance. method.
  • AMOLED active matrix organic light emitting diode
  • the Active Moment Organic Light-Emitting Diode Display has the advantages of wide viewing angle, good color contrast, fast response speed, and low cost, so it is very suitable for electronic clocks, mobile phones, personal digital assistants, and digital Applications for small size displays such as cameras.
  • an object of the present invention is to provide an active matrix organic light emitting diode driving control circuit and an adjusting method capable of dynamically adjusting white balance, which can dynamically adjust white as the active matrix organic light emitting diode display panel is used. balance.
  • the present invention provides an active matrix capable of dynamically adjusting white balance.
  • the machine light emitting diode driving control circuit is suitable for driving a moving matrix organic light emitting diode display panel.
  • This active matrix organic device capable of dynamically adjusting white balance includes: 3 ⁇ 4 a diode drive control circuit including: a gate drive circuit, a source drive circuit, a programmable voltage generator, and a timing control circuit.
  • the gate driving circuit is used to generate a horizontal scanning signal to control the display of the scanning lines of the "# 1" active matrix organic light emitting diode display panel.
  • the source driving circuit is configured with a horizontal scanning signal to drive the video data of the scanning lines to be displayed to the active matrix organic light emitting diode display panel.
  • the programmable voltage generator is used to generate a plurality of programmable voltage sources, respectively The power of the red, green and blue pixels of the active matrix organic light emitting diode display panel.
  • the timing control circuit is coupled to the gate driving circuit, the source driving circuit and the programmable voltage generator to control the gate driving circuit and the source.
  • the driving circuit drives the timing of the video data, and dynamically adjusts the voltage value of the programmable voltage source according to the use situation of the active matrix organic light emitting diode display panel, and further sees the purpose of adjusting the white balance of the active matrix organic light emitting diode display panel. .
  • the timing control circuit includes a source and gate timing data control circuit, an interface processing circuit, and a white balance adjustment circuit.
  • the source and gate timing data control circuit is used to control the timing of the gate driving circuit and the source driving circuit to drive the number of videos.
  • the interface processing circuit is used as an interface for signal transmission, and the white balance adjustment circuit is coupled to the source and gate timing data control circuit and the interface processing circuit, and is used for adjusting according to the use of the active matrix organic display diode display panel.
  • the adjustment parameter of the voltage value of the programmable voltage source is transmitted through the interface processing circuit.
  • the white balance adjustment circuit includes at least: a first comparator, a counter, a second comparator, and operation logic and a parameter setting unit.
  • the first comparator is used to compare the video data with the data-set value to generate a first comparison signal.
  • the first comparison signal represents a signal in which the display gray level of the input video data is not less than the data set value.
  • the counter is coupled to the first comparator, and is configured to count a count value of the counter according to the first comparison signal.
  • the counting method is, for example, to increase the count value by one.
  • the second comparator is coupled to the counter, and The count value of the counter is compared with a count set value to generate a second t comparison signal, that is, a signal in which the number of display gray levels of the video data is not less than the data set value has reached the count set value.
  • the operation logic is coupled to the second comparator for generating an adjustment signal according to the second comparison signal when a set time is reached.
  • the parameter setting unit is coupled to the operation logic and uses ⁇ according to the adjustment signal to set an adjustment parameter that can adjust the voltage value of the programmable voltage source, and transmits it through the interface processing circuit described in the following.
  • the foregoing data setting value, counting setting value and setting time may be stored in, for example, a read-only memory, an electronic erasable programmable read-only memory or a flash memory, and the aforementioned interface processing circuit may provide, for example, lie A serial transmission interface.
  • the invention also provides a method for adjusting the white balance of the active matrix organic light emitting diode zone control circuit, which is applicable to dynamically adjust the white balance of an active matrix organic light emitting diode display panel.
  • the method includes the following steps: providing a plurality of programmable voltage sources, and W is used as a power source for the red, green, and blue pixels of the active matrix organic light emitting diode display panel; and dynamically according to the use situation of the active matrix organic light emitting diode display panel. Adjust the voltage value of the programmable fe voltage source.
  • the step of dynamically adjusting the programmable voltage source according to the use situation of the active matrix organic light emitting diode display surface may include: receiving a video data; comparing the video data with a data set value; when the video data is not less than
  • the data setting value, also ft is a data setting value where the display gray level of the video data is not less than, for example, 255, rounding a count value; comparing the counted count value with a count set value; and when a setting
  • the voltage value of the programming voltage source is adjusted to provide a better active matrix organic light emitting diode display panel.
  • Bein can follow the attenuation situation of the active matrix organic light emitting diode display panel. To dynamically adjust the white balance, it can provide better white balance of the active matrix organic light emitting diode display panel.
  • FIG. 2 shows a pixel circuit diagram of an active matrix organic light emitting diode.
  • FIG. 3 shows a characteristic curve of the transistor in FIG. 2.
  • FIG. 4 shows a schematic diagram of an active matrix organic light emitting diode driving control circuit capable of dynamically adjusting white balance according to a preferred embodiment of the present invention.
  • Figure 5 shows a block diagram of a timing control packet path according to a preferred embodiment of the present invention.
  • FIG. 6 is a schematic diagram of dividing a display panel with a resolution of 1024 * 768 into 16 regions.
  • FIG. 7 shows a schematic diagram of a white balance adjustment circuit according to a preferred embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating a method for adjusting a white balance of an active matrix organic light emitting diode driving control circuit according to a preferred embodiment of the present invention.
  • FIG. 2 shows a pixel circuit diagram of an active matrix organic light emitting diode.
  • the Active Matrix Organic Light Emitting Diode (AMOLEDM for short) includes: a transistor 210, a transistor 220, a capacitor 230, and an organic light emitting diode 240.
  • the gate of the transistor 210 is connected to a scan line and a drain.
  • An electrode is connected to the data line, one end of the source is connected to the gate of the capacitor 220, the drain of the transistor 220 is connected to the power source Vdd, and the source is connected to the anode of the organic light emitting diode 240.
  • Its operation mode is: when a horizontal scanning signal received by the scanning line is scanned to this pixel, the transistor 210 is turned on to transmit the voltage of the data line to the gate of the transistor 220 to obtain the gate voltage Vgc.
  • organic The display brightness of the light emitting diode 240 is proportional to the current Id flowing through the organic light emitting diode 240. Therefore, the display gray scale of the organic light emitting diode 240 can be controlled by the voltage value representing the video data on the data line.
  • the present invention adjusts the magnitude of the current Id flowing through the organic light emitting diode 240 by adjusting the voltage value of the power source Vdd of the pixel in FIG. Instead, the actual display brightness of the organic light emitting diode 240 is changed.
  • the efficacy of this adjustment method can be confirmed by referring to the characteristic curve of the transistor in FIG. 3.
  • FIG. 4 is a schematic diagram of an active matrix organic light emitting diode driving control circuit capable of dynamically adjusting white balance according to a preferred embodiment of the present invention.
  • the active matrix organic light emitting diode driving control circuit capable of dynamically adjusting the white balance includes: a gate driving circuit 410, a source region moving circuit 420, a programmable voltage generator 430, and a timing control circuit 440, which are used for An active matrix organic light emitting diode display panel 450 including the pixel arrays R, G, and B in S is driven.
  • the gate driving circuit 410 is used for generating a horizontal scanning signal to control the display of the scanning lines of the main matrix organic light emitting diode display panel 450.
  • the source driving circuit 420 uses the horizontal scanning signal to drive the video data of the scanning lines to be displayed to the active matrix organic display panel 450.
  • the programmable voltage generator 430 is used to generate a plurality of programmable voltages Vdd_r and Vss_r, Vdd_g and Vss_g, and Vdd_b and Vss-b, etc., as the active moments ⁇ (R) and green (R) of the organic light emitting diode display panel 450, respectively. G), blue (B) pixel power.
  • the timing control circuit 440 is coupled to the gate driving circuit 410, the source driving circuit 420, and the programmable voltage generator 430 to control the timing of the gate driving circuit 410 and the source driving circuit 420 to drive video data, and
  • the programmable voltage sources Vdd—r and Vss—r, Vdd— are dynamically adjusted.
  • the voltage values of g and Vss-g and Vdd_b and Vss-b, etc. achieve the purpose of adjusting the white balance of the active matrix organic light emitting diode display panel 450.
  • FIG. 5 is a schematic diagram of a timing control circuit according to a preferred embodiment of the present invention.
  • the timing control circuit 440 includes a source and gate timing data control circuit 510, an interface processing circuit 530, and a white balance adjustment circuit 520.
  • the source and gate timing digital grip control circuit 510 is used to control the timing of the gate driving circuit 410 and the source driving circuit 420 to drive video data.
  • the interface processing circuit 530 is used to provide a serial transmission interface such as IIC as an interface for signal transmission.
  • the white balance adjustment circuit 520 is coupled to the source and gate timing data control circuit 510 and the interface processing circuit 530, and is configured to use the active matrix organic light emitting diode display panel according to the use situation of the active matrix organic light emitting diode display panel. The number of pixels above the value, etc.
  • the adjustment parameter of the voltage value of the process voltage source is transmitted through the interface provided by the interface processing circuit 530.
  • FIG. 6 is a schematic diagram of dividing a display panel with a resolution of 1024 * 768 into 16 regions. According to the description of the circuits in FIG. 4 and FIG.
  • an active matrix organic light emitting diode driving control circuit capable of dynamically adjusting white balance according to a preferred embodiment of the present invention, for example, an active matrix organic light emitting diode display panel display time and Display the number of pixels with a gray level above a certain value to adjust the voltage value of the programmable voltage source.
  • the active matrix organic light-emitting diode display panel is further divided into 16 regions, and the number of gray-scale display of the active matrix organic light-emitting diodes in each region under a certain value is counted in a certain period of time, as the judgment of the material degradation situation. Basis.
  • the number of distinguished regions of the active matrix organic light emitting diode display panel can be changed according to different needs.
  • the white balance adjustment circuit includes at least a first comparator 710, a counter 720, a second comparator 730, an operation logic 740, and a parameter setting unit 750.
  • the first comparator 710, the counter 720, the second comparator 730, and the operation logic 740 are used here to detect an area of the active matrix organic light emitting diode display panel.
  • the number of comparators and counters also needs to be increased simultaneously. mouth.
  • the first comparator 710 is used to compare the video data to be displayed with a data set value of, for example, 255 to generate a first comparison signal Cl, and the first comparison signal C1 displays the grayed-out video data input in gray.
  • the signal whose order is not less than the data set value. For example, when comparing with the 255 gray level data set value, among 8-byte video data, the display video data with the largest material loss can be detected.
  • the counter 720 is coupled to the first comparator 710 and is configured to count a count value of the counter 720 according to the first comparison signal C1.
  • the counting method is, for example, to increase the count value by one when the comparison signal C1 is received.
  • the second comparator 730 is coupled to the counter 720, and is used for comparing the count value of the counter 720 with a count set value to generate a second comparison signal C2, which is to compare the display gray of the visualizer data. Whether the number of steps is not less than the data set value has reached the count set value.
  • the AND logic 740 is coupled to the second comparator 730, and is configured to generate an adjustment signal ADJ according to the second comparison signal C2 when a set time is reached.
  • the parameter setting unit 750 is coupled to the operation logic s 740, and is used to adjust the voltage value of the programmable voltage source based on the adjustment signal ADJ, and transmitted to the programmable through the interface processing circuit 530 of FIG. 5 Voltage generator 430.
  • the used data set value, count set value, set time, etc. can be stored in, for example, a read-only memory (ROM), an electronically erasable programmable read-only memory (EEPROM), or a flash memory. And is read as comparison data each time the active matrix organic light emitting diode display panel is started to display.
  • ROM read-only memory
  • EEPROM electronically erasable programmable read-only memory
  • flash memory flash memory
  • FIG. 8 is a schematic flowchart of a method for adjusting a white balance of an active moment P vehicle organic light emitting diode driving control circuit according to a preferred embodiment of the present invention.
  • This method is suitable for dynamically adjusting the white balance of an active matrix organic light emitting diode display panel. It must first provide multiple programmable voltage sources to serve as the power source for the red, green, and blue pixels of the active matrix organic light emitting diode display panel, respectively. Then, the voltage value of the programmable voltage source is dynamically adjusted according to the use of the active matrix organic light emitting diode display panel.
  • the active matrix organic light emitting diode display panel to be adjusted can be divided into, for example, 16 regions, but since the detailed method flow of each region is the same as that of the first region, therefore, FIG. 8 only details Draw the port in the first area, as explained below.
  • step 810 first receive video data from the outside, and in step 820, determine which region of the active matrix organic light emitting diode display panel the received video data belongs to before entering the detailed process of that region. For example, when it is determined that the received video data belongs to the first area of the active matrix organic light emitting diode display panel, as shown in step 830, the 4 video data is compared with a data setting value such as a gray level 255.
  • step 840 When the video data is not less than the data set value, proceed to step 840 to carry a count value, that is, the number of video data not less than the gray set value of 255, and then in step 850, the counted value and the A count set value is compared, and it is determined whether the count value of the count is not less than the count-set value when a set time is reached.
  • the process proceeds to step 860 to adjust the voltage value of the programmable voltage source to provide a better white balance of the active matrix organic light emitting diode display panel.
  • the set time and the count set value for comparison can be adjusted according to requirements. Therefore, its purpose is not limited to only one set time and count set value, but multiple sets can be used. When set, 1 and count set value.

Description

主动矩阵有机发光二极管驱动控制电路及调整白平衡方法 技术领域
本发明是有关于一种主动矩阵有机发光二极管 (Active Matrix Organic Light Emitting Diode, 简称 AMOLED)驱动控制电路， 且特别是有关于一种可 动态调整白平衡的主动矩阵有机发光二极管驱动控制电路及调整方法。
背景技术
随着信息科技的发达，各式各样如电脑、移动电话、个人数位助理（PDA) 及数码相机等信息设备， 均不断地推陈出新。 在这些信息设备中， 显示器始 终扮演着举足轻重的地位， 而平面显示器 (Flat Panel Display)由于具有薄型、 量轻及省电的特性， 乃逐渐地受到欢迎。
在各种平面显示器中， 主动矩 I牢有机发光二极管显示器因具有视角广、 色彩对比效果好、 响应速度快及成本低等优点， 故十分适用于如电子时钟、 移动电话、 个人数位助理及数码相机等小尺寸显示器的应用。
然而， 由于主动矩阵有机发光二极管显示面板使用的有机发光二极管， 其红 (R)、 绿 (G：)、 蓝 (B)三色的材料特性并不相同， 因此， 会有长时间操作后， 使得发光亮度不一致， 导致白平衡不佳的情形。请参看图 1所示， 其 (a)、 （b)、 (c)分别为红、 绿、 蓝三色高分子发光才才料亮度 -寿命特性曲线图， 图中， 颜色 较淡的曲线即为红、 绿、 蓝三色高分子发光材料的亮度衰耗曲线。 明显地， 红、 绿、 蓝三色高分子发光材料的亮度衰耗特性并不相同， 故当主动矩阵有 机发光二极管显示面板经过长时间的操作后， 将会有发光亮度不一致， 导致 白平衡不佳的问题。
发明内容
有鉴于此， 本发明的目的是提供一种可动态调整白平衡的主动矩阵有机 发光二极管驱动控制电路及调整方法， 其可随着主动矩阵有机发光二极管显 示面板的使用情形， 来动态地调整白平衡。
为达上述及其他目的， 本发明提供一种可动态调整白平衡的主动矩阵有 机发光二极管驱动控制电路， 可适用于驱动一 动矩阵有机发光二极管显示 面板。 此可动态调整白平衡的主动矩阵有机发: ¾二极管驱动控制电路包括： 栅极驱动电路、 源极驱动电路、 可编程电压产生器及时序控制电路。 其中， 栅极驱动电路用以产生一水平扫描信号， 以控 "#1」主动矩阵有机发光二极管显 示面板的扫描线的显示。 源极驱动电路用以配 "^水平扫描信号， 来将欲显示 的扫描线的视频数据驱动至主动矩阵有机发光二极管显示面板。 可编程电压 产生器用以产生多个可编程电压源， 以分别作力主动矩阵有机发光二极管显 示面板的红、 绿、 蓝像素的电源。 而时序控制电路则耦接栅极驱动电路、 源 极驱动电路及可编程电压产生器， 用以控制栅 驱动电路与源极驱动电路驱 动视频数据的时序， 并根据主动矩阵有机发光二极管显示面板的使用情形， 来动态地调整可编程电压源的电压值， 进而实 3见调整主动矩阵有机发光二极 管显示面板的白平衡的目的。
在一实施例中， 其时序控制电路包括： 源 及与栅极时序数据控制电路、 接口处理电路及白平衡调整电路。 其中， 源极与栅极时序数据控制电路用以 控制栅极驱动电路与源极驱动电路驱动视频数 的时序。 接口处理电路用以 作为信号传送的接口， 而白平衡调整电路则耦 源极与栅极时序数据控制电 路及接口处理电路， 用以根据主动矩阵有机发 ¾二极管显示面板的使用情形， 来将调整可编程电压源的电压值的调整参数， 过接口处理电路传送。
在一实施例中， 主动矩阵有机发光二极管 _ 示面板的使用情形， 计数其 在一设定时间内， 视频数据的显示灰阶不小于 f冽如是 255 的数据设定值的数 目， 以探测材料的衰耗情形， 并据以产生调整可编程电压源的电压值的调整 参数。 因此， 其白平衡调整电路至少包括： 第一比较器、 计数器、 第二比较 器、 及运算逻辑以及参数设定单元。
其中， 第一比较器用以将视频数据与数据 -设定值作比较， 产生第一比较 信号， 第一比较信号代表输入的视频数据的显示灰阶不小于数据设定值的信 号。 计数器耦接第一比较器， 用以根据第一比教信号， 来计数计数器的一计 数值， 其计数方法例如是将计数值加一。 第二比较器耦接计数器， 用以将计 数器的计数值与一计数设定值作比较， 产生第二 t匕较信号， 也就是视频数据 的显示灰阶不小于数据设定值的数目已达计数设 值的信号。 及运算逻辑耦 接第二比较器， 用以当一设定时间到达时， 根据第二比较信号， 来产生一调 整信号。 而参数设定单元则耦接及运算逻辑， 用 ^根据调整信号， 来设定可 调整可编程电压源的电压值的调整参数， 并通过靈述的接口处理电路传送。
前述数据设定值、计数设定值及设定时间可以^!存在例如是只读存储器、 电子可抹除可编程只读存储器或快闪存储器中， 西前述接口处理电路则可以 提供例如是 lie的一串列式传输接口。
本发明另提供一种主动矩阵有机发光二极管区动控制电路的白平衡调整 方法， 可适用于动态地调整一主动矩阵有机发光二极管显示面板的白平衡。 此方法包括下列步骤： 提供多个可编程电压源， W分别作为主动矩阵有机发 光二极管显示面板的红、 绿、 蓝像素的电源； 以及根据主动矩阵有机发光二 极管显示面板的使用情形， 来动态地调整可编程 fe压源的电压值。
其中， 根据主动矩阵有机发光二极管显示面反的使用情形， 来动态地调 整可编程电压源的步骤可以包括： 接收一视频数据； 将视频数据与一数据设 定值作比较； 当视频数据不小于数据设定值， 也 ft是视频数据的显示灰阶不 小于例如是 255 的数据设定值时， 进位一计数值； 将所计数的计数值与一计 数设定值作比较； 以及当一设定时间到达且计数的计数值不小于计数设定值， 也就是探测材料的衰耗达到设定的程度时， 调整 编程电压源的电压值， 以 提供主动矩阵有机发光二极管显示面板的较佳的白平衡。
由上述说明中可知， 应用本发明所提供的一中可动态调整白平衡的主动 矩阵有机发光二极管驱动控制电路及调整方法， 贝 因其可随着主动矩阵有机 发光二极管显示面板的衰耗情形， 来动态地调整白平衡， 故可以提供主动矩 阵有机发光二极管显示面板的较佳的白平衡。
为让本发明的上述和其他目的、 特征、 和优^能更明显易懂， 下文特以 较佳实施例， 并配合所附图式， 作详细说明如下：
附图说明 图 l(a)、 （b)、 （c)分别显示红、 绿、 蓝三色高分子发光材料的亮度-寿命特 性曲线图。
图 2显示一种主动矩阵有机发光二极管像素电路图。
图 3显示图 2中的晶体管的特性曲线图。
图 4显示根据本发明较佳实施例的一种可动态调整白平衡的主动矩阵有 机发光二极管驱动控制电路示意图。 · 图 5显示根据本发明较佳实施例的一种时序控制包路方块示意图。
图 6显示将解析度 1024*768的显示面板区分为 16个区域的示意图。 图 7显示根据本发明较佳实施例的一种白平衡调整电路示意图。
图 8显示根据本发明较佳实施例的一种主动矩阵有机发光二极管驱动控 制电路的白平衡调整方法流程示意图。
具体实施方式
图 2所示为一种主动矩阵有机发光二极管像素电路图。 图中显示， 该主 动矩阵有机发光二极管 (Active Matrix Organic Light Emitting Diode , 简称 AMOLEDM象素包括： 晶体管 210、 晶体管 220、 电容 230及有机发光二极管 240。 其中， 晶体管 210的栅极连接扫描线、 漏极连接数据线、 源极连接电容 230的一端与晶体管 220的栅极， 晶体管 220的漏极连接电源 Vdd、源极连接 有机发光二极管 240的阳极端。
其操作方式为， 当扫描线接收的一水平扫描信号扫描至此像素时， 会导 通晶体管 210， 以将数据线的电压传送至晶体管 220白勺栅极， 获得栅极电压 Vgc 一般而言， 有机发光二极管 240的显示亮度与流经有机发光二极管 240 的电流 Id成正比的， 因此， 可通过数据线上代表视频数据的电压值， 来控制 有机发光二极管 240的显示灰阶。
如前在图 1 中的所述， 当主动矩阵有机发光二极管显示面板经过长时间 操作后， 会因为红、 绿、 蓝三色高分子发光材料衰耗特性的不同， 以致有发 光亮度不一致， 导致白平衡不佳的问题。 因此， 本发呢通过调整图 2 中像素 的电源 Vdd的电压值， 来调整流经有机发光二极管 240的电流 Id的大小， 进 而改变有机发光二极管 240的实际显示亮度。 此种调整方法的功效， 可参考 图 3中晶体管的特性曲线图而获得证实。
图 4所示为根据本发明较佳实施例的一种可动态调整白平衡的主动矩阵 有机发光二极管驱动控制电路示意图。 图中显示， 此可动态调整白 f衡的主 动矩阵有机发光二极管驱动控制电路包括：栅极驱动电路 410、源极区动电路 420、 可编程电压产生器 430及时序控制电路 440， 其用于驱动包括 S中的像 素阵列 R、 G、 B的一主动矩阵有机发光二极管显示面板 450。
其中， 栅极驱动电路 410用以产生一水平扫描信号， 以控制主 矩阵有 机发光二极管显示面板 450的扫描线的显示。 源极驱动电路 420用^配合水 平扫描信号， 来将欲显示的扫描线的视频数据驱动至主动矩阵有机^:光二极 管显示面板 450。 可编程电压产生器 430用以产生多个可编程电压爾 Vdd_r 与 Vss_r、 Vdd_g与 Vss_g及 Vdd_b与 Vss— b等， 以分别作为主动矩^有机发 光二极管显示面板 450的红 （R) 、 绿 （G) 、 蓝 （B) 像素的电源。 而时序 控制电路 440则耦接栅极驱动电路 410、源极驱动电路 420及可编程 fe压产生 器 430，用以控制栅极驱动电路 410与源极驱动电路 420驱动视频数据白勺时序， 并根据主动矩阵有机发光二极管显示面板 450 的使用情形， 例如是 显示时 间与显示灰阶在一定值以上的像素的数目等， 来动态地调整可编- 电压源 Vdd— r与 Vss— r、 Vdd—g与 Vss一 g及 Vdd_b与 Vss— b等的电压值， 进西实现调 整主动矩阵有机发光二极管显示面板 450的白平衡的目的。
请参考图 5所示， 为根据本发明较佳实施例的一种时序控制电^方块示 意图。图中显示，时序控制电路 440包括：源极与栅极时序数据控制电路 510、 接口处理电路 530及白平衡调整电路 520。其中，源极与栅极时序数握控制电 路 510用以控制栅极驱动电路 410与源极驱动电路 420驱动视频数据白勺时序。 接口处理电路 530用以提供例如是 IIC的一串列式传输接口，以作为信号传送 的接口。 而白平衡调整电路 520则耦接源极与栅极时序数据控制电路 510及 接口处理电路 530， 用以根据主动矩阵有机发光二极管显示面板的使用情形， 例如是其显示时间与显示灰阶在一定值以上的像素的数目等， 来将酒整可编 程电压源的电压值的调整参数， 通过接口处理电路 530所提供的接口传送。 请参考图 6所示， 其为将解析度 1024*768的显示面板区分为 16个区域 的示意图。 依图 4与图 5的电路的说明， 根据本发明较佳实施例的一种可动 态调整白平衡的主动矩阵有机发光二极管驱动控制电路， 以例如是主动矩阵 有机发光二极管显示面板的显示时间与显示灰阶在一定值以上的像素的数目 等， 来调整可编程电压源的电压值。 而为了可以更精确地探测出主动矩阵有 机发光二极管显示面板的驱动显示情形， 也就是其材料的衰退†胄形， 以便白 平衡调整电路 520可以更精确地调整可编程电压源的电压值起见， 此处将主 动矩阵有机发光二极管显示面板再区分为 16个区域， 以分别 数在一定时间 内， 各区域的主动矩阵有机发光二极管承受一定值以上的灰阶显示的数目， 作为判断其材料衰退情形的根据。 当然， 如本领域技术人员所知， 主动矩阵 有机发光二极管显示面板的区分区域的数目， 是可以依不同需求来变化的。
因此， 根据本发明较佳实施例的一种白平衡调整电路示意图可以如图 7 所示。 图中， 白平衡调整电路至少包括： 第一比较器 710、 计数器 720、 第二 比较器 730、 及运算逻辑 740以及参数设定单元 750。 当然， ¾Τ本领域技术人 员所知， 此处的第一比较器 710、 计数器 720、 第二比较器 730、 及运算逻辑 740等，用以探测主动矩阵有机发光二极管显示面板的一个区城中， 多个设定 时间与计数设定值子其一的情形， 当为了探测更多区域的更多设定时间与计 数设定值的情形时， 其比较器与计数器等的数量也需同步地增力口。
图 7中， 第一比较器 710用以将欲显示的视频数据与例如是 255的数据 设定值作比较， 产生第一比较信号 Cl， 第一比较信号 C1代麦输入的视频数 据的显示灰阶不小于数据设定值的信号。 此处如以灰阶 255 数据设定值来 比较时， 在 8字节的视频数据中， 将可探测出材料衰耗最大的显示视频数据。
此外， 计数器 720耦接第一比较器 710， 用以根据第一比较信号 Cl， 来 计数计数器 720的一计数值， 其计数方法例如是在接收到比较信号 C1时， 将 计数值加一。第二比较器 730耦接计数器 720，用以将计数器 720的计数值与 一计数设定值作比较， 产生第二比较信号 C2， 也就是比较视步员数据的显示灰 阶不小于数据设定值的数目是否已达计数设定值。 及运算逻辑 740耦接第二 比较器 730， 用以当一设定时间到达时， 根据第二比较信号 C2， 来产生一调 整信号 ADJ。而参数设定单元 750则耦接及运算逻辑 s740，用以根 调整信号 ADJ，来设定调整可编程电压源的电压值的调整参数，并通过图 5的接口处理 电路 530传送至可编程电压产生器 430。
其中， 使用的数据设定值、 计数设定值及设定时间等可以储 在例如是 只读存储器 （ROM) 、 电子可抹除可编程只读存储器 （EEPROM ) 或快闪存 储器 (flash memory)中， 并于每次启动主动矩阵有机发光二极管显示面板显示 时， 读入作为比较数据。
请参考图 8所示， 其为根据本发明较佳实施例的一种主动矩 P车有机发光 二极管驱动控制电路的白平衡调整方法流程示意图。 此方法可适用于动态地 调整一主动矩阵有机发光二极管显示面板的白平衡， 其首先必须提供多个可 编程电压源， 以分别作为主动矩阵有机发光二极管显示面板的红、 绿、 蓝像 素的电源， 然后再根据主动矩阵有机发光二极管显示面板的使用'清形， 来动 态地调整可编程电压源的电压值。 如前所述， 欲调整的主动矩阵有机发光二 极管显示面板可区分为例如是 16个区域， 但因每一区域的详细的 整方法流 程均与第一区域相同， 因此， 图 8 中仅详细地绘出第一区域的流港， 说明如 下。
在步骤 810中， 首先自外部接收一视频数据， 并在步骤 820 中， 判断所 接收的视频数据属于主动矩阵有机发光二极管显示面板的哪一个区域， 然后 才进入那一个区域的详细流程。 例如当判断所接收的视频数据属于主动矩阵 有机发光二极管显示面板的第一区域时， 则如步骤 830所示， 将 4见频数据与 一例如是灰阶 255 的数据设定值作比较， 当视频数据不小于数据设定值时， 进入 840步骤， 以进位一计数值， 也就是视频数据不小于灰阶 255的数据设 定值的数目， 然后在 850步骤中， 将所计数的计数值与一计数设定值作比较， 并判断当一设定时间到达时， 其计数的计数值是否已不小于计数 -设定值。 当 设定时间到达且计数的计数值不小于计数设定值， 也就是代表探则材料的衰 耗已达到设定的程度时， 进入 860步骤， 调整可编程电压源的 ¾压值， 以提 供主动矩阵有机发光二极管显示面板的较佳的白平衡。 当然， itr述作为比较 的设定时间与计数设定值， 是可以依需求来调整的， 因此， 其 目将不限于 仅有一个设定时间与计数设定值， 而可以是使用多组的设定时 1 与计数设定 值。
虽然本发明已以较佳实施例揭露如上， 然其并非用以限定 发明， 任何 本领域技术人员， 在不脱离本发明的精神和范围内， 当可作各种更动与润饰， 因此本发明的保护范围当视后附的申请保护范围所界定者为准。

Claims

权 利 要 求 书
1.一种可动态调整白平衡的主动矩阵有机发光二极管驱动控制电路，用于 驱动一主动矩阵有机发光二极管显示面板， 包括：
一栅极驱动电路， 用以产生一水平扫描信号， 以控制读主动矩阵有机发 光二极管显示面板的扫描线的显示；
一源极驱动电路， 用以配合该水平扫描信号， 来将扫描线的一视频数据 驱动至该主动矩阵有机发光二极管显示面板；
一可编程电压产生器， 用以产生多个可编程电压源， 以分别作为该主动 矩阵有机发光二极管显示面板的红、 绿、 蓝像素的电源； 及
一时序控制电路， 耦接该栅极驱动电路、 该源极驱动电路及该可编程电 压产生器， 用以控制该栅极驱动电路与该源极驱动电路驱动该视频数据的时 序， 并根据该主动矩阵有机发光二极管显示面板的使用情形， 来动态地调整 该些可编程电压源的电压值。
2.如权利要求 1 所述的可动态调整白平衡的主动矩阵有机发光二极管驱 动控制电路， 其中该时序控制电路包括：
一源极与栅极时序数据控制电路， 用以控制该栅极驱动电路与该源极驱 动电路驱动该视频数据的时序；
一接口处理电路， 用以作为信号传送的接口； 以及
一白平衡调整电路， 耦接该源极与栅极时序数据控制电路及该接口处理 电路， 用以根据该主动矩阵有机发光二极管显示面板的使用情形， 将可调整 该些可编程电压源的电压值的调整参数， 通过该接口处理电路传送。
3.如权利要求 2 所述的可动态调整白平衡的主动矩阵有机发光二极管驱 动控制电路， 其中该白平衡调整电路至少包括：
一第一比较器， 用以将该视频数据与一数据设定值作 b匕较， 产生一第一 比较信号；
一计数器， 耦接该第一比较器， 用以根据该第一比较言号， 来计数该计 数器的一计数值；
一第二比较器， 耦接该计数器， 用以将该计数值与一计数设定值作比较， 产生一第二比较信号；
一及运算逻辑， 耦接该第二比较器， 用以当一设定时间到达日 ， 根据该 第二比较信号， 产生一调整信号； 以及
一参数设定单元， 耦接该及运算逻辑， 用以根据该调整信号， 来设定调 整该些可编程电压源的电压值的调整参数， 并通过该接口处理电路-传送。
4.如权利要求 3 所述的可动态调整白平衡的主动矩阵有机发^:二极管驱 动控制电路， 其中该数据设定值、 该计数设定值及该设定时间储存于一只读 存储器中。
5.如权利要求 3 所述的可动态调整白平衡的主动矩阵有机发;) 二极管驱 动控制电路， 其中该数据设定值、 该计数设定值及该设定时间储存于一电子 可抹除可编程只读存储器中。
6.如权利要求 3 所述的可动态调整白平衡的主动矩阵有机发 二极管驱 动控制电路， 其中该数据设定值、 该计数设定值及该设定时间储存于一快闪 存储器中。
7.如权利要求 2所述的可动态调整白平衡的主动矩阵有机发 fc二极管驱 动控制电路， 其中该接口处理电路提供一串列式传输接口。
8.—种主动矩阵有机发光二极管驱动控制电路的白平衡调整方法，适用于 动态地调整一主动矩阵有机发光二极管显示面板的白平衡， 包括下列步骤： 提供多个可编程电压源， 以分别作为该主动矩阵有机发光二 管显示面 板的红、 绿、 蓝像素的电源； 以及
根据该主动矩阵有机发光二极管显示面板的使用情形， 来动 地调整该 些可编程电压源的电压值。
9.如权利要求 8 所述的主动矩阵有机发光二极管驱动控制电各的白平衡 调整方法， 其中根据该主动矩阵有机发光二极管显示面板的使用†静形， 来动 态地调整该些可编程电压源的步骤包括： 接收一视频数据；
将该视频数据与一数据设定值作比较；
当该视频数据不小于该数据设定值时， 进位一计数值；
将该计数值与一计数设定值作比较； 以及
当一设定时间到达且该计数值不小于该计数设定值时， 调整该些可编程 电压源的电压值。
PCT/CN2004/000315 2004-04-06 2004-04-06 Circuit d'attaque de diode electroluminescente organique a matrice active pouvant regler dynamiquement la balance des blancs et procede de reglage de ce circuit WO2005098808A1 (fr)

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PCT/CN2004/000315 WO2005098808A1 (fr) 2004-04-06 2004-04-06 Circuit d'attaque de diode electroluminescente organique a matrice active pouvant regler dynamiquement la balance des blancs et procede de reglage de ce circuit

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002351357A (ja) * 2001-03-22 2002-12-06 Semiconductor Energy Lab Co Ltd 発光装置、その駆動方法及び電子機器
CN1393843A (zh) * 2001-06-22 2003-01-29 Lg.飞利浦Lcd有限公司 有源矩阵有机发光二极管的驱动电路
CN1409404A (zh) * 2001-09-28 2003-04-09 株式会社半导体能源研究所 发光器件和采用该器件的电子设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002351357A (ja) * 2001-03-22 2002-12-06 Semiconductor Energy Lab Co Ltd 発光装置、その駆動方法及び電子機器
CN1393843A (zh) * 2001-06-22 2003-01-29 Lg.飞利浦Lcd有限公司 有源矩阵有机发光二极管的驱动电路
CN1409404A (zh) * 2001-09-28 2003-04-09 株式会社半导体能源研究所 发光器件和采用该器件的电子设备

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