TWI772099B - 應用於有機發光二極體顯示器之亮度補償方法 - Google Patents

應用於有機發光二極體顯示器之亮度補償方法 Download PDF

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TWI772099B
TWI772099B TW110125400A TW110125400A TWI772099B TW I772099 B TWI772099 B TW I772099B TW 110125400 A TW110125400 A TW 110125400A TW 110125400 A TW110125400 A TW 110125400A TW I772099 B TWI772099 B TW I772099B
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frame rate
frame
compensation
display
emitting diode
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唐尚平
李弘�
林峰立
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瑞鼎科技股份有限公司
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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]
    • 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
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • 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
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • 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
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time

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  • Computer Hardware Design (AREA)
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  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Led Device Packages (AREA)

Abstract

本發明揭露一種應用於有機發光二極體顯示器之亮度補償方法，包括下列步驟：(a)採用跳過幀或延伸邊沿之方式致使有機發光二極體顯示器之顯示幀率從第一幀率降低至第二幀率，其中該第一幀率高於該第二幀率；以及(b)針對不更新的重複幀或延伸邊沿期間所對應的N個發光控制脈衝的脈寬進行補償，其中該N個發光控制脈衝對應於N個補償值，N≧1且該N個補償值為正數或負數。

Description

應用於有機發光二極體顯示器之亮度補償方法
本發明係與有機發光二極體(ORGANIC LIGHT-EMITTING DIODE,OELD)顯示器有關，尤其是關於一種應用於有機發光二極體顯示器之亮度補償方法。
請參照圖1，圖1繪示一般的有機發光二極體顯示面板的顯示單元的電路圖。如圖1所示，有機發光二極體OLED之發光亮度與下列因素有關：(1)流經有機發光二極體OLED之電流Ioled，且電流Ioled會與(電源電壓ELVDD-資料電壓Vdata)的電壓差成正比；以及(2)與發光控制線EMn的工作週期(Duty)成正比。
請參照圖2A及圖2B，圖2A及圖2B分別繪示在不改變閘極及發光控制設定/保持時間(Hold time)設定的情況下降低有機發光二極體顯示面板的顯示幀率(Display Frame rate)的不同方法的時序圖。
如圖2A所示，跳過幀(Skip frame)方式用以重複上一個幀的時序以降低顯示幀率，但重複幀不更新，其延伸受限於需以幀為最小單位。因此，假設原本的幀率為60Hz，若延伸一個不更新的重複幀，則幀率變為 60Hz/2=30Hz；若延伸兩個不更新的重複幀，則幀率變為60Hz/3=20Hz；其餘可依此類推。
如圖2B所示，延伸邊沿(Extend porch)方式用以根據上一個幀的邊沿期間延伸一段不更新的延伸邊沿期間，以降低顯示幀率，其延伸係以發光控制脈衝(EM pulse)為最小單位。
由於當OLED面板的顯示畫面不更新時，希望能以低幀率方式顯示來達到省電需求，因此，在以正常幀率顯示一幀畫面後，即可透過跳過幀或延伸邊沿方式來實現低幀率，並希望OLED面板無論是在正常幀率或和低幀率下均能維持一致的顯示亮度。
然而，根據圖1可知：資料電壓Vdata會與OLED面板內的電容儲存電荷有關，低幀率會造成電荷漏電導致資料電壓Vdata變低，因而使得有機發光二極體OLED之發光亮度改變而讓畫面變亮或變暗。換言之，高低幀率之不同會導OLED面板的顯示亮度出現明顯差異，並且低幀率會在OLED面板更新的幀內感受到亮暗變化。
有鑑於此，本發明提出一種應用於有機發光二極體顯示器之亮度補償方法，以有效解決先前技術所遭遇到之上述問題。
依據本發明之一具體實施例為一種亮度補償方法。於此實施例中，亮度補償方法係應用於有機發光二極體顯示器。亮度補償方法包括下列步驟：(a)採用跳過幀(Skip frame)方式根據前一幀產生不更新的至少一重複幀，致使有機發光二極體顯示器之顯示幀率(Display frame rate)從第一幀率降至第二幀率，其中第一幀率高於第二幀率；以及(b)針對該至少一重複 幀所對應的N個發光控制脈衝(EM pulse)的脈寬進行補償，其中該N個發光控制脈衝對應於N個補償值，N≧1且該N個補償值為正數或負數。
於一實施例中，該至少一重複幀中之第一重複幀所對應的複數個補償值彼此不同。
於一實施例中，該至少一重複幀中之第一重複幀所對應的複數個補償值彼此不同。
於一實施例中，該至少一重複幀中之第一重複幀與第二重複幀所對應的複數個補償值彼此不同。
於一實施例中，該至少一重複幀中之第一重複幀與第二重複幀分別對應於第一補償值及第二補償值，且第一補償值不同於第二補償值。
於一實施例中，該些補償值的數量是以幀為單位增加。
依據本發明之另一具體實施例亦為一種亮度補償方法。於此實施例中，亮度補償方法係應用於有機發光二極體顯示器。亮度補償方法包括下列步驟：(a)採用延伸邊沿(Extend porch)方式根據前一幀中的邊沿期間產生不更新的一段延伸邊沿期間，致使有機發光二極體顯示器之顯示幀率(Display frame rate)從第一幀率降至第二幀率，其中第一幀率高於第二幀率；以及(b)針對該段延伸邊沿期間所對應的N個發光控制脈衝(EM pulse)的脈寬進行補償，其中該N個發光控制脈衝對應於N個補償值，N≧1且該N個補償值為正數或負數。
於一實施例中，該段延伸邊沿期間所對應的複數個補償值彼此不同。
於一實施例中，該段延伸邊沿期間所對應的複數個補償值彼此相同。
於一實施例中，該段延伸邊沿期間所對應的複數個補償值以M個補償值為一組進行設定，M≧1。
於一實施例中，該些補償值的數量是以發光控制脈衝為單位增加。
相較於先前技術，本發明提出一種應用於有機發光二極體顯示器之亮度補償方法，其透過對於降低顯示幀率時所產生的不更新期間(重複幀或延伸邊沿期間)所對應的複數個發光控制脈衝的脈寬進行補償，使得在低顯示幀率時的有機發光二極體發光亮度能與正常顯示幀率時一致，藉以有效提升有機發光二極體顯示器之顯示品質。
關於本發明之優點與精神可以藉由以下的發明詳述及所附圖式得到進一步的瞭解。
S10~S12:步驟
M1~M4:開關
Md:開關
Ms:開關
C1:電容
OLED:有機發光二極體
Ioled:流經有機發光二極體之電流
Vdata:資料電壓
ELVDD : 電源電壓
ELVSS:電源電壓
VINT:初始電壓源
EMn:發光控制線
Dm:資料線
Gwn:掃描線
Gin:掃描線
EM:發光控制脈衝
VA:更新期間
VP:邊沿期間
SKF:不更新期間
EM1~EM4:發光控制脈衝週期
EXVP:延伸邊沿期間
A~H:補償值
本發明所附圖式說明如下：圖1繪示習知的有機發光二極體顯示面板的顯示單元的電路圖。
圖2A及圖2B分別繪示在不改變閘極及發光控制設定/保持時間設定的情況下降低有機發光二極體顯示面板的顯示幀率的不同方法的時序圖。
圖3繪示根據本發明之一具體實施例中之應用於有機發光二極體顯示器之亮度補償方法的流程圖。
圖4A繪示當有機發光二極體顯示器之顯示幀率為正常幀率60Hz時的時序圖。
圖4B繪示當有機發光二極體顯示器之顯示幀率透過跳過幀方式從圖4A的正常幀率60Hz降至低幀率30Hz時的時序圖。
圖4C繪示對於圖4B中之不更新的重複幀所對應的複數個發光控制脈衝的脈寬進行補償時的時序圖。
圖4D繪示當有機發光二極體顯示器之顯示幀率透過跳過幀方式從圖4A的正常幀率60Hz降至低幀率20Hz時對於不更新的第一重複幀及第二重複幀所對應的複數個發光控制脈衝的脈寬進行補償的時序圖。
圖4E繪示當有機發光二極體顯示器之顯示幀率透過跳過幀方式從圖4A的正常幀率60Hz降至低幀率20Hz時對於不更新的第一重複幀及第二重複幀所對應的複數個發光控制脈衝的脈寬進行補償的時序圖。
圖5A繪示當有機發光二極體顯示器之顯示幀率為正常幀率60Hz時的時序圖。
圖5B繪示當有機發光二極體顯示器之顯示幀率透過延伸邊沿方式從圖5A的正常幀率60Hz降至低幀率24Hz時的時序圖。
圖5C繪示對於圖5B中之不更新的延伸邊沿期間所對應的複數個發光控制脈衝的脈寬進行補償時的時序圖。
圖5D繪示當有機發光二極體顯示器之顯示幀率透過延伸邊沿方式從圖5A的正常幀率60Hz降至低幀率20Hz時對於不更新的延伸邊沿期間所對應的複數個發光控制脈衝的脈寬進行補償的時序圖。
圖5E繪示當有機發光二極體顯示器之顯示幀率透過延伸邊沿方式從圖5A的正常幀率60Hz降至低幀率20Hz時對於不更新的延伸邊沿期間所對應的複數個發光控制脈衝的脈寬進行補償的時序圖。
現在將詳細參考本發明的示範性實施例，並在附圖中說明所述示範性實施例的實例。在圖式及實施方式中所使用相同或類似標號的元件/構件是用來代表相同或類似部分。
依據本發明之一具體實施例為一種亮度補償方法。於此實施例中，亮度補償方法係應用於有機發光二極體顯示器。請參照圖3，圖3繪示此實施例中之應用於有機發光二極體顯示器之亮度補償方法的流程圖。
如圖3所示，亮度補償方法可包括下列步驟：步驟S10：採用跳過幀(Skip frame)或延伸邊沿(Extend porch)方式使有機發光二極體顯示器之顯示幀率(Display frame rate)從第一幀率降低至第二幀率，其中第一幀率高於第二幀率；以及步驟S12：針對跳過幀或延伸邊沿方式所產生的不更新期間所對應的N個發光控制脈衝(EM pulse)的脈寬進行補償，其中該N個發光控制脈衝對應於N個補償值，N≧1且該N個補償值為正數或負數。
需說明的是，由於本發明使有機發光二極體顯示器之顯示幀率降低的方法可以是跳過幀或延伸邊沿方式，接下來將以實際例子分別說明這兩種降低顯示幀率的方法。
請參照圖4A，圖4A繪示當有機發光二極體顯示器之顯示幀率為正常幀率60Hz時的時序圖。
如圖4A所示，具有正常幀率60Hz的顯示幀之時序包括更新期間VA及不更新的邊沿期間VP且其對應於四個發光控制脈衝週期 EM1~EM4。發光控制脈衝EM分別在發光控制脈衝週期EM1~EM4開始時由低位準變為高位準且具有相同的脈衝寬度。
如圖4B所示，當有機發光二極體顯示器之顯示幀率透過跳過幀方式從圖4A的正常幀率60Hz降至低幀率30Hz時，跳過幀方式係根據圖4A的具有正常幀率60Hz的顯示幀重複產生出不更新的重複幀於其後，使得有機發光二極體顯示器之顯示幀率從圖4A的60Hz變為圖4B的60Hz/2=30Hz。需說明的是，該重複幀之時序包括不更新期間SKF及邊沿期間VP且對應於四個發光控制脈衝週期EM1~EM4。
接著，如圖4C所示，本發明會對於圖4B中之不更新的重複幀所對應的四個發光控制脈衝週期EM1~EM4的脈寬分別進行補償，其補償值分別為A、B、C、D。換言之，本發明對於不同發光控制脈衝週期可採用不同補償值進行補償且補償值可為正數或負數(亦即對脈寬之補償可以是增加脈寬或減少脈寬)，但不以此為限。需說明的是，由於是採用跳過幀方式來降低顯示幀率，故該些補償值的數量是以幀為單位增加，但不以此為限。
此外，如圖4D所示，當有機發光二極體顯示器之顯示幀率透過跳過幀方式從圖4A的正常幀率60Hz降至低幀率20Hz時，跳過幀方式係根據圖4A的具有正常幀率60Hz的顯示幀依序產生不更新的第一重複幀及第二重複幀於其後，使得有機發光二極體顯示器之顯示幀率從圖4A的60Hz變為圖4D的60Hz/3=20Hz。需說明的是，第一重複幀及第二重複幀之時序均包括不更新期間SKF及邊沿期間VP且均對應於四個發光控制脈衝週期EM1~EM4。接著，本發明會對於不更新的第一重複幀所對應的四個發光控制脈衝週期EM1~EM4以及第二重複幀所對應的四個發光控制脈衝週期 EM1~EM4的脈寬分別進行補償，其補償值分別為A、B、C、D、E、F、G、H。換言之，本發明對於不同重複幀的發光控制脈衝週期可採用不同補償值進行補償且補償值可為正數或負數(亦即對脈寬之補償可以是增加脈寬或減少脈寬)，但不以此為限。
另外，如圖4E所示，當有機發光二極體顯示器之顯示幀率透過跳過幀方式從圖4A的正常幀率60Hz降至低幀率20Hz時，本發明亦可對於不更新的第一重複幀所對應的四個發光控制脈衝週期EM1~EM44的脈寬分別進行補償，其補償值均為A，以及對於不更新的第二重複幀所對應的四個發光控制脈衝週期EM1~EM4的脈寬分別進行補償，其補償值均為B。換言之，本發明可對於同一重複幀的發光控制脈衝週期採用相同補償值進行補償，但不同重複幀的發光控制脈衝週期則採用不同補償值且補償值可為正數或負數(亦即對脈寬之補償可以是增加脈寬或減少脈寬)，但不以此為限。
請參照圖5A，圖5A繪示當有機發光二極體顯示器之顯示幀率為正常幀率60Hz時的時序圖。
如圖5A所示，具有正常幀率60Hz的顯示幀之時序包括更新期間VA及邊沿期間VP且對應於四個發光控制脈衝週期EM1~EM4。發光控制脈衝EM分別在發光控制脈衝週期EM1~EM4開始時由低位準變為高位準且具有相同的脈寬。
如圖5B所示，當有機發光二極體顯示器之顯示幀率透過延伸邊沿方式從圖5A的正常幀率60Hz降至低幀率24Hz時，延伸邊沿方式係根據圖5A的具有正常幀率60Hz的顯示幀中之邊沿期間VP產生對應於六個發光 控制脈衝週期的不更新的延伸邊沿期間EXVP於其後，使得有機發光二極體顯示器之顯示幀率從圖5A的60Hz變為圖5B的60Hz*4/(4+6)=24Hz。
接著，如圖5C所示，本發明會對於圖5B中之不更新的延伸邊沿期間EXVP所對應的六個發光控制脈衝週期的脈寬分別進行補償，其補償值分別為A、B、C、D、E、F。換言之，本發明對於不同發光控制脈衝週期可採用不同補償值進行補償且補償值可為正數或負數(亦即對脈寬之補償可以是增加脈寬或減少脈寬)，但不以此為限。需說明的是，由於是採用延伸邊沿方式來降低顯示幀率，而延伸邊沿期間EXVP可隨實際需求包括不同數量的發光控制脈衝，亦即該些補償值的數量是以發光控制脈衝為單位增加，但不以此為限。
此外，如圖5D所示，當有機發光二極體顯示器之顯示幀率透過延伸邊沿方式從圖5A的正常幀率60Hz降至低幀率20Hz時，延伸邊沿方式係根據圖5A的具有正常幀率60Hz的顯示幀中之邊沿期間VP產生對應於八個發光控制脈衝週期的不更新的延伸邊沿期間EXVP於其後，使得有機發光二極體顯示器之顯示幀率從圖5A的60Hz變為圖5D的60Hz*4/(4+8)=20Hz。接著，本發明會對於不更新的延伸邊沿期間EXVP所對應的八個發光控制脈衝週期分別進行補償，其補償值分別為A、B、C、D、E、F、G、H。換言之，本發明對於不同發光控制脈衝週期可採用不同補償值進行補償且補償值可為正數或負數(亦即對脈寬之補償可以是增加脈寬或減少脈寬)，但不以此為限。
另外，如圖5E所示，當有機發光二極體顯示器之顯示幀率透過延伸邊沿方式從圖5A的正常幀率60Hz降至低幀率20Hz時，本發明會對於 不更新的延伸邊沿期間EXVP所對應的八個發光控制脈衝週期分別進行補償，其補償值可以M個補償值(M≧1)為一組進行設定，假設M=4，則補償值可分別為A、A、A、A、B、B、B、B。本發明可對於同一組發光控制脈衝週期採用相同補償值進行補償，但不同組發光控制脈衝週期則採用不同補償值且補償值可為正數或負數(亦即對脈寬之補償可以是增加脈寬或減少脈寬)，但不以此為限。
相較於先前技術，本發明提出一種應用於有機發光二極體顯示器之亮度補償方法，其透過對於降低顯示幀率時所產生的不更新期間(重複幀或延伸邊沿期間)所對應的複數個發光控制脈衝的脈寬進行補償，使得在低顯示幀率時的有機發光二極體發光亮度能與正常顯示幀率時一致，藉以有效提升有機發光二極體顯示器之顯示品質。
S10~S12:步驟

Claims (11)

  1. 一種亮度補償方法，應用於有機發光二極體顯示器，包括下列步驟： (a)採用跳過幀(Skip frame)方式根據前一幀產生不更新的至少一重複幀，致使該有機發光二極體顯示器之顯示幀率(Display frame rate)從第一幀率降至第二幀率，其中該第一幀率高於該第二幀率；以及 (b)針對該至少一重複幀所對應的N個發光控制脈衝(EM pulse)的脈寬進行補償，其中該N個發光控制脈衝對應於N個補償值，N≧1且該N個補償值為正數或負數。
  2. 如請求項1所述的亮度補償方法，其中該至少一重複幀中之第一重複幀所對應的複數個補償值彼此不同。
  3. 如請求項1所述的亮度補償方法，其中該至少一重複幀中之第一重複幀所對應的複數個補償值彼此相同。
  4. 如請求項1所述的亮度補償方法，其中該至少一重複幀中之第一重複幀與第二重複幀所對應的複數個補償值彼此不同。
  5. 如請求項1所述的亮度補償方法，其中該至少一重複幀中之第一重複幀與第二重複幀分別對應於第一補償值及第二補償值，且該第一補償值不同於該第二補償值。
  6. 如請求項1所述的亮度補償方法，其中該些補償值的數量是以幀為單位增加。
  7. 一種亮度補償方法，應用於有機發光二極體顯示器，包括下列步驟： (a)採用延伸邊沿(Extend porch)方式根據前一幀中的邊沿期間產生不更新的一段延伸邊沿期間，致使該有機發光二極體顯示器之顯示幀率(Display frame rate)從第一幀率降至第二幀率，其中該第一幀率高於該第二幀率；以及 (b)針對該段延伸邊沿期間所對應的N個發光控制脈衝(EM pulse)的脈寬進行補償，其中該N個發光控制脈衝對應於N個補償值，N≧1且該N個補償值為正數或負數。
  8. 如請求項7所述的亮度補償方法，其中該段延伸邊沿期間所對應的複數個補償值彼此不同。
  9. 如請求項7所述的亮度補償方法，其中該段延伸邊沿期間所對應的複數個補償值彼此相同。
  10. 如請求項7所述的亮度補償方法，其中該段延伸邊沿期間所對應的複數個補償值以M個補償值為一組進行設定，M≧1。
  11. 如請求項7所述的亮度補償方法，其中該些補償值的數量是以發光控制脈衝為單位增加。
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