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TWI658451B - Display device driving method - Google Patents

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Publication number
TWI658451B
TWI658451B TW107108091A TW107108091A TWI658451B TW I658451 B TWI658451 B TW I658451B TW 107108091 A TW107108091 A TW 107108091A TW 107108091 A TW107108091 A TW 107108091A TW I658451 B TWI658451 B TW I658451B
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Taiwan
Prior art keywords
voltage
display device
oled
power source
driving transistor
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TW107108091A
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English (en)
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TW201837889A (zh
Inventor
張書環
姜海斌
陳心全
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大陸商昆山國顯光電有限公司
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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
    • G09G3/22—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
    • G09G3/3233—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 current through 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
    • 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
    • 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
    • G09G3/2007—Display of intermediate tones
    • 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]
    • 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

一種顯示裝置驅動方法。顯示裝置包括OLED和驅動電晶體，該OLED的陽極連接驅動電晶體的源極，將該驅動電晶體的汲極連接正電源；將該OLED的陰極連接負電源；使得正電源和負電源之間的電壓差為7.1V~9.6V。這樣能夠有效消除由於OLED分壓偏大，導致驅動電晶體分壓偏小，而造成模組高灰階過渡不平滑現象，可使驅動電晶體保持工作在飽和區，避免高灰階過渡不平滑現象的發生，提高生產良率。

Description

顯示裝置驅動方法
本發明有關於顯示領域，特別是有關於一種顯示裝置驅動方法。
平板顯示裝置具有機身薄、省電、無輻射等眾多優點，因此得到廣泛的應用。現有的平板顯示裝置主要包括液晶顯示器(Liquid Crystal Display，LCD)及有機發光二極體(Organic Light-Emitting Diode，OLED)顯示裝置。
OLED顯示裝置是新一代平板顯示裝置中的主力軍。它與以液晶為代表的其它平板顯示裝置相比具有低成本、自發光、寬視角、低電壓、低功率消耗、全固態顯示、抗震動、高可靠性、快速響應等很多優點。
OLED顯示裝置可包括多個像素單元，每一像素單元中包含一OLED作為該像素單元的發光元件，OLED顯示裝置還可包括驅動晶片，用以向各像素單元提供資料信號電源Vdata(即是在不同灰階下顯示的Gamma電壓，通常包括0~255階)。OLED的亮度由流過OLED的電流大小控制，現有的OLED顯示裝置存在高灰階過渡不平滑現象，嚴重影響其正常使用。
本發明的目的在於提供一種顯示裝置驅動方法，改善 高灰階過渡不平滑現象。
為解決上述技術問題，本發明提供一種顯示裝置驅動方法，該顯示裝置包括OLED和驅動電晶體，該OLED的陽極連接驅動電晶體的源極，該方法包括：將該驅動電晶體的汲極連接正電源；將該OLED的陰極連接負電源；使得該正電源和該負電源之間的電壓差為7.1V~9.6V。
可選的，對於所述的顯示裝置驅動方法，該正電源提供的電壓為固定值，該負電源提供的電壓為可調整的電壓。
可選的，對於所述的顯示裝置驅動方法，該正電源提供的電壓為4V~5V。
可選的，對於所述的顯示裝置驅動方法，該負電源提供的電壓為-5V~-2.5V。
可選的，對於所述的顯示裝置驅動方法，使得該正電源和該負電源之間的電壓差為8.1V~9.1V。
可選的，對於所述的顯示裝置驅動方法，該負電源提供的電壓為-4.5V~-3.5V。
可選的，對於所述的顯示裝置驅動方法，該正電源提供的電壓為可調整的電壓，該負電源提供的電壓為固定值。
可選的，對於所述的顯示裝置驅動方法，該驅動電晶體的汲源電壓如下：Vds=正電源電壓-負電源電壓-Voled，其中，Vds為驅動電晶體的汲源電壓，Voled為OLED兩端電壓。
可選的，對於所述的顯示裝置驅動方法，該顯示裝置 還包括一電容，該驅動電晶體的閘極藉由該電容連接該正電源。
本發明提供的顯示裝置驅動方法，該顯示裝置包括OLED和驅動電晶體，該OLED的陽極連接驅動電晶體的源極，將該驅動電晶體的汲極連接正電源，將該OLED的陰極連接負電源，使得正電源和負電源之間的電壓差為7.1V~9.6V。這樣能夠有效消除由於OLED分壓偏大，導致驅動電晶體分壓偏小，而造成模組高灰階過渡不平滑現象，可使驅動電晶體保持工作在飽和區，避免高灰階過渡不平滑現象的發生，提高生產良率。
10‧‧‧可變電阻區
20‧‧‧飽和區
C1‧‧‧電容
D1‧‧‧OLED
DTFT‧‧‧驅動電晶體
EM‧‧‧發射電源
M1‧‧‧第一開關電晶體
M2‧‧‧第二開關電晶體
M3‧‧‧第三開關電晶體
M4‧‧‧第四開關電晶體
M5‧‧‧第五開關電晶體
M6‧‧‧第六開關電晶體
Scan1‧‧‧第一掃描電源
Scan2‧‧‧第二掃描電源
Vdata‧‧‧資料信號電源
Vdd‧‧‧正電源
Vref‧‧‧參考電源
Vss‧‧‧負電源
圖1為一種顯示裝置的驅動電晶體的輸出特徵曲線示意圖；圖2為本發明中顯示裝置的結構示意圖；圖3為本發明中顯示裝置驅動方法的流程圖。
下面將結合示意圖對本發明的顯示裝置驅動方法進行更詳細的描述，其中表示本發明的較佳實施例，應該理解本領域技術人員可以修改在此描述的本發明，而仍然實現本發明的有利效果。因此，下列描述應當被理解為對於本領域技術人員的廣泛知道，而並不作為對本發明的限制。
在下列段落中參照附圖以舉例方式更具體地描述本發明。根據下面說明和請求項，本發明的優點和特徵將更清楚。需說明的是，附圖均採用非常簡化的形式且均使用非精準的比例，僅用以方便、清晰地輔助說明本發明實施例的目的。
發明人對高灰階過渡不平滑現象進行研究，經過大量 實驗分析後發現，原因為同樣亮度下(即流過OLED的電流大小不變)且處於高灰階時，OLED分壓偏大，導致與OLED相連的驅動電晶體的汲源電壓在電路中的分壓偏小。於是，如圖1所示的驅動電晶體的輸出特徵曲線(橫座標表示汲源電壓，縱座標表示汲極電流)，灰階V255對應的驅動電晶體的汲源電壓大小由實線箭頭A處被移至虛線箭頭B處，即驅動電晶體從飽和區20變為處於可變電阻區10(曲線L1的左半部分對應可變電阻區10，右半部分對應飽和區20，該輸出特徵曲線還包括擊穿區，並未圖示)，導致流過驅動電晶體和OLED的電流不穩定，形成高灰階過渡不平滑現象。
基於此，本發明提出一種顯示裝置驅動方法，該顯示裝置包括OLED和驅動電晶體，該OLED的陽極連接驅動電晶體的源極，該方法中，將驅動電晶體的汲極接正電源，將OLED的陰極接負電源，使得正電源和負電源之間的電壓差為7.1V~9.6V。
以下列舉該顯示裝置驅動方法的較佳實施例，以清楚的說明本發明的內容，應當明確的是，本發明的內容並不限制於以下實施例，其他藉由本領域普通技術人員的常規技術手段的改進亦在本發明的思想範圍之內。
下面結合圖2及圖3對本發明的顯示裝置驅動方法進行詳細說明。
本發明的顯示裝置驅動方法中，該顯示裝置包括OLED D1(有機發光二極體)和驅動電晶體DTFT(Driver Thin Film Transistor)，該OLED的陽極連接驅動電晶體DTFT的源極，如圖3可知，該方法包括：步驟S11：將該驅動電晶體DTFT的汲極連接正電源Vdd； 步驟S12：將OLED的陰極連接負電源Vss；步驟S13：使得正電源Vdd和負電源Vss之間的電壓差為7.1V~9.6V。
上述步驟S11、步驟S12可以有著其他執行順序，例如同時進行等。
在一個實施例中，該正電源Vdd提供的電壓為固定值，該負電源Vss提供的電壓可調整。該正電源Vdd提供的電壓可以從4V~5V中選擇，例如，該正電源Vdd提供的電壓為4.6V，該負電源Vss電壓為-5V~-2.5V。考慮到外界環境因素(如溫度、材料等)也會影響驅動電晶體DTFT的工作電壓，所以負電源Vss電壓可以有一定的變動範圍，以確保驅動電晶體DTFT處於飽和區，進一步的，負電源Vss電壓又涉及到顯示裝置的功率消耗。本實施例還可以進一步限定正電源Vdd和負電源Vss之間的電壓差為8.1V~9.1V。同樣對於該正電源Vdd提供的電壓為4.6V為例，可以選擇的負電源Vss電壓為-4.5V~-3.5V，這一電壓範圍是綜合以上因素獲得，既能夠確保驅動電晶體DTFT處於飽和區，改善高灰階色彩準確度，又可以使得顯示裝置的功率消耗處在可接受範圍內，並且還可以使得顯示裝置能夠承受住大部分環境(例如陰雨天氣)的衝擊。
可以理解的是，本申請的顯示裝置驅動方法中，也可以使正電源Vdd提供的電壓可調整，該負電源Vss提供的電壓為固定值，只要使正電源和負電源之間的電壓差為7.1V~9.6V就能夠確保驅動電晶體DTFT處於飽和區，改善高灰階色彩準確度，避免發生模組高灰階過渡不平滑現象。圖2給予本發明顯示裝置的示意 圖，如圖2可知，該驅動電晶體DTFT的汲源電壓Vds=正電源電壓Vdd-負電源電壓Vss-Voled，其中Voled為OLED兩端的電壓。可以肯定的是，在裝置正常情況下，Voled不變，那麼本發明藉由使得正電源Vdd和負電源Vss之間的電壓差(即正電源電壓Vdd-負電源電壓Vss)為7.1V~9.6V，例如為8.0V、8.2V、8.3V、8.5V、8.7V、8.9V等，能夠使得驅動電晶體DTFT汲源電壓Vds變大。結合圖1可見，Vds增大可以使得驅動電晶體DTFT更容易處在飽和區工作，從而避免因驅動電晶體的電阻波動而導致的流過驅動電晶體和OLED的電流的波動，如此就避免高灰階過渡不平滑現象的發生。
多數電源IC產生的正電源電壓Vdd和負電源電壓Vss中，正電源電壓Vdd固定，故上文以限制負電源Vss電壓處在特殊範圍內來達到改善高灰階過渡不平滑現象的目的。可以理解的是，對於正電源電壓Vdd可調整的情況，依然可以採用本發明的方法，例如，可以是使得負電源電壓Vss固定，限定正電源電壓Vdd的範圍，只需使得正電源電壓Vdd和負電源電壓Vss之間的電壓差為7.1V~9.6V即可。另外，也可以是使得正電源電壓Vdd和負電源電壓Vss都可以調整，同樣滿足正電源電壓Vdd和負電源電壓Vss之間的電壓差為7.1V~9.6V即可。本領域技術人員在本發明公開的基礎上，能夠知曉如何進行設計。
請繼續參考圖2，該顯示裝置還包括一電容C1，該驅動電晶體DTFT的閘極藉由該電容C1連接正電源Vdd。
如圖2中以7T1C結構(7個薄膜電晶體和1個電容)來應用本發明的方法。對於7T1C結構，可以是：該顯示裝置還包括一第一開關電晶體M1(由圖2可知，本實施 例中的電晶體皆為PMOS)，該第一開關電晶體M1的源極連接一資料信號電源Vdata，由該資料信號電源Vdata提供不同灰階的Gamma電壓，該第一開關電晶體M1的汲極連接該驅動電晶體DTFT的汲極。該顯示裝置還包括一第二開關電晶體M2，該第二開關電晶體M2的源極連接該驅動電晶體DTFT的汲極，該第二開關電晶體M2的汲極連接該正電源Vdd。該顯示裝置還包括一第三開關電晶體M3，該第三開關電晶體M3的汲極連接該驅動電晶體DTFT的閘極，該第三開關電晶體M3的源極連接一參考電源Vref，該第三開關電晶體M3的閘極連接第一掃描電源Scan1。該顯示裝置還包括一第四開關電晶體M4和一第五開關電晶體M5，該第四開關電晶體M4的源極連接該驅動電晶體DTFT的閘極，該第四開關電晶體M4的汲極連接該第五開關電晶體M5的源極，該第四開關電晶體M4的閘極連接第二掃描電源Scan2；該第五開關電晶體M5的汲極連接該OLED的陽極，該第五開關電晶體M5的源極還連接該驅動電晶體DTFT源極，該第五開關電晶體M5的閘極連接一發射電源EM；該第二開關電晶體M2的閘極連接該發射電源EM；該第一開關電晶體M1的閘極連接該第二掃描電源Scan2。該顯示裝置還包括一第六開關電晶體M6，該第六開關電晶體M6的源極連接該參考電源Vref，該第六開關電晶體的汲極連接該OLED的陽極，該第六開關電晶體M6的閘極連接該第一掃描電源Scan1。
綜上所述，本發明提供的顯示裝置驅動方法，該顯示裝置包括OLED和驅動電晶體，該OLED的陽極連接驅動電晶體的源極，將驅動電晶體的汲極連接正電源，將OLED的陰極連接負電源，使得正電源和負電源之間的電壓差為7.1V-9.6V。這樣能夠有 效消除由於OLED分壓偏大，導致驅動電晶體分壓偏小，而造成模組高灰階過渡不平滑現象，可使驅動電晶體保持工作在飽和區，避免高灰階過渡不平滑現象的發生，提高生產良率。
顯然，本領域的技術人員可以對本發明進行各種改動和變型而不脫離本發明的精神和範圍。這樣，倘若本發明的這些修改和變型屬於本發明請求項及其等同技術的範圍之內，則本發明也意圖包含這些改動和變型在內。

Claims (5)

  1. 一種顯示裝置驅動方法，該顯示裝置包括一OLED和一驅動電晶體，該OLED的陽極連接該驅動電晶體的源極，該方法包括：將該驅動電晶體的汲極連接一正電源；將該OLED的陰極連接一負電源；其中，該正電源提供的電壓為固定值，該負電源提供的電壓為可調整的電壓，使得該正電源和該負電源之間的電壓差為8.1V~9.1V。
  2. 如請求項1之顯示裝置驅動方法，其中，該正電源提供的電壓為4V~5V。
  3. 如請求項1之顯示裝置驅動方法，其中，該負電源提供的電壓為-4.5V~-3.5V。
  4. 如請求項1之顯示裝置驅動方法，其中，該驅動電晶體的一汲源電壓如下：Vds=正電源電壓-負電源電壓-Voled，其中，Vds為該驅動電晶體的該汲源電壓，Voled為OLED兩端的電壓。
  5. 如請求項1之顯示裝置驅動方法，其中，該顯示裝置還包括一電容，該驅動電晶體的閘極藉由該電容連接該正電源。
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