TWI780882B - Light emitting diode display device and method for driving the same - Google Patents
Light emitting diode display device and method for driving the same Download PDFInfo
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Abstract
Description
本發明是有關於一種顯示裝置及其驅動方法,特別是關於一種發光二極體的顯示裝置及其驅動方法。 The present invention relates to a display device and its driving method, in particular to a light emitting diode display device and its driving method.
不同的驅動方式能應用於各種顯示裝置,其中驅動方式包括:例如,脈波振幅調變(Pulse-amplitude modulation,PAM)以及脈波寬度調變(Pulse-width modulation,PWM)。PWM的驅動方法能利用調整驅動訊號的脈波寬度來驅動主動式發光二極體。然而,當顯示低灰階影像時,由於所需的發光時間短,使對應的驅動訊號的脈波寬度窄,進而造成佔空比(duty cycle)低。因此,顯示裝置在顯示低灰階影像時,具有顯示均勻度低以及畫面閃爍的問題。 Different driving methods can be applied to various display devices, wherein the driving methods include, for example, pulse-amplitude modulation (PAM) and pulse-width modulation (PWM). The PWM driving method can drive active light-emitting diodes by adjusting the pulse width of the driving signal. However, when displaying low-gray-scale images, the pulse width of the corresponding driving signal is narrow due to the short light-emitting time required, thereby resulting in a low duty cycle. Therefore, the display device has the problems of low display uniformity and screen flicker when displaying low-grayscale images.
本發明提供一種發光二極體顯示裝置,能降低驅動訊號的占空比,以減少畫面閃爍並提升顯示均勻度。 The invention provides a light-emitting diode display device, which can reduce the duty ratio of a driving signal, so as to reduce screen flicker and improve display uniformity.
本發明的發光二極體顯示裝置包括多個畫素電路、時序控制器以及訊號產生器。多個畫素電路形成顯示列。時序控制器用以根據顯示資料,提供第一控制訊號以及第二控制訊號。訊號產生器用以接收第一控制訊號以及第二控制訊號,並用以根據第一控制訊號以及第二控制訊號,產生調變訊號至顯示列。調變訊號在圖像框週期中具有多個脈波,以多次驅動顯示列中的多個發光元件。 The LED display device of the present invention includes a plurality of pixel circuits, a timing controller and a signal generator. A plurality of pixel circuits form a display column. The timing controller is used for providing the first control signal and the second control signal according to the display data. The signal generator is used for receiving the first control signal and the second control signal, and is used for generating modulation signals to the display bar according to the first control signal and the second control signal. The modulation signal has multiple pulses in the image frame period to drive multiple light emitting elements in the display row.
本發明另提供一種發光二極體顯示裝置的驅動方法。此驅動方法包括以下的操作:根據顯示資料以提供第一控制訊號以及第二控制訊號;根據第一控制訊號以及第二控制訊號,產生並提供調變訊號至顯示列,其中調變訊號在圖像框週期中具有多個脈波;以及在圖像框週期中,多次驅動顯示列中的多個發光元件。 The invention further provides a driving method of the light emitting diode display device. This driving method includes the following operations: providing the first control signal and the second control signal according to the display data; generating and providing the modulation signal to the display bar according to the first control signal and the second control signal, wherein the modulation signal is shown in Fig. There are a plurality of pulse waves in the image frame period; and in the image frame period, a plurality of light-emitting elements in the display column are driven multiple times.
基於上述,本發明的發光二極體顯示裝置可以利用控制訊號所產生的調變訊號來驅動顯示列,其中調變訊號在圖像框週期中具有多個脈波。因此,在一個圖像框週期中,能多次驅動顯示列中的多個發光元件而減少畫面閃爍並提升顯示均勻度。 Based on the above, the light-emitting diode display device of the present invention can use the modulation signal generated by the control signal to drive the display row, wherein the modulation signal has multiple pulses in the image frame period. Therefore, in one image frame period, multiple light-emitting elements in the display column can be driven multiple times to reduce screen flicker and improve display uniformity.
為讓本發明的上述特徵和優點能更明顯易懂,下文特舉實施例,並配合所附圖式作詳細說明如下。 In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.
100:發光二極體顯示裝置 100: Light-emitting diode display device
110:時序控制器 110: Timing controller
120:訊號產生器 120: Signal generator
130:畫素電路 130: Pixel circuit
131:顯示列 131: Display columns
132:顯示行 132: Display line
140:掃描驅動器 140: scan driver
150:資料驅動器 150:Data drive
310:時序控制器 310: timing controller
311:第一控制訊號電路 311: the first control signal circuit
312:第二控制訊號電路 312: The second control signal circuit
3121:脈波產生器 3121: pulse generator
3122、3123:閘控電路 3122, 3123: gate control circuit
320:訊號產生器 320: signal generator
321:斜波電路 321: Ramp wave circuit
322、323:電壓準位位移電路 322, 323: voltage level displacement circuit
3211:邏輯電路 3211: logic circuit
3212:積分電路 3212: integrating circuit
500:畫素電路 500: pixel circuit
510:開關 510: switch
520:調變電路 520: modulation circuit
530:驅動電路 530: drive circuit
S310~S350:步驟 S310~S350: Steps
S610~S630:步驟 S610~S630: steps
A1、A2、A3:脈波 A1, A2, A3: pulse wave
C1、C2:電容 C1, C2: capacitance
CK:時脈訊號 CK: clock signal
CP:比較器電路 CP: comparator circuit
D1:二極體 D1: Diode
DI:抖動資訊 DI: Jitter Information
dt:時間差 dt: time difference
dV:電壓差 dV: voltage difference
EM:致能訊號 EM: enable signal
FT、FT1、FT2、FTn:圖像框週期 FT, FT1, FT2, FTn: image frame period
LED:發光二極體 LED: light emitting diode
OP:運算放大器 OP: operational amplifier
P1:時序 P1: Timing
R1:電阻 R1: resistance
SW1、SW2:開關 SW1, SW2: switch
T1、T2、T3:致能時間 T1, T2, T3: enabling time
Vdata、Vdata1、Vdata2:資料訊號 Vdata, Vdata1, Vdata2: data signal
VDD:電壓 VDD: Voltage
Vg、Vg1、Vg2:驅動訊號 Vg, Vg1, Vg2: drive signal
VH、VL:控制訊號 VH, VL: control signal
Vscan:掃描訊號 Vscan: scan signal
VSS:電壓 VSS: Voltage
Vsweep、Vsweep1、Vsweep1:調變訊號 Vsweep, Vsweep1, Vsweep1: modulation signal
Vt:控制訊號 Vt: control signal
圖1是依照本發明的實施例的一種發光二極體顯示裝置的示意圖。 FIG. 1 is a schematic diagram of a light emitting diode display device according to an embodiment of the present invention.
圖2是依照本發明圖1實施例的發光二極體顯示裝置的驅動訊號產生方式的時序圖。 FIG. 2 is a timing diagram of the driving signal generation method of the LED display device according to the embodiment of FIG. 1 of the present invention.
圖3是依照本發明的實施例的發光二極體顯示裝置中的時序控制器以及訊號產生器實施方式的示意圖。 FIG. 3 is a schematic diagram of an implementation of a timing controller and a signal generator in a light-emitting diode display device according to an embodiment of the present invention.
圖4是依照本發明圖3實施例的多個訊號的時序圖。 FIG. 4 is a timing diagram of multiple signals according to the embodiment of FIG. 3 of the present invention.
圖5是依照本發明的實施例的一種畫素電路的示意圖。 FIG. 5 is a schematic diagram of a pixel circuit according to an embodiment of the invention.
圖6是依照本發明的實施例的一種發光二極體顯示裝置的驅動方法的流程圖。 FIG. 6 is a flowchart of a driving method of a light emitting diode display device according to an embodiment of the present invention.
圖1是依照本發明的實施例的一種發光二極體顯示裝置的示意圖,請參考圖1。發光二極體顯示裝置100包括時序控制器110、訊號產生器120、多個畫素電路130、掃描驅動器140以及資料驅動器150,其中畫素電路130以陣列設置,並形成多個顯示列131以及多個顯示行132。
FIG. 1 is a schematic diagram of a light emitting diode display device according to an embodiment of the present invention, please refer to FIG. 1 . The light-emitting
在本實施例中,時序控制器110耦接訊號產生器120、掃描驅動器140以及資料驅動器150。時序控制器110可根據顯示資料提供控制訊號VL、VH至訊號產生器120,並可提供其他控制訊號(未繪示)至掃描驅動器140以及資料驅動器150以分別控制訊號產生器120、掃描驅動器140以及資料驅動器150。訊號產生器120耦接每個顯示列131。訊號產生器120可接收控制訊號VL、VH,並可根據控制訊號VL、VH,產生多個調變訊號Vsweep。
調變訊號Vsweep被傳送至對應的各顯示列131以調變用以驅動畫素電路130的驅動訊號。
In this embodiment, the
調變訊號Vsweep在圖像框週期中具有多個脈波,以使利用調變訊號Vsweep產生的驅動訊號在圖像框週期中能多次驅動對應的顯示列131中的多個發光元件。
The modulation signal Vsweep has a plurality of pulses in the image frame period, so that the driving signal generated by the modulation signal Vsweep can drive the plurality of light emitting elements in the
掃描驅動器140耦接每個顯示列131,並可提供多個掃描訊號Vscan至對應的各顯示列131,以選擇被驅動的顯示列131。資料驅動器150耦接每個顯示行132,並可提供多個資料訊號Vdata至對應的各顯示行132以協同各顯示列131對應的調變訊號Vsweep來調變而產生驅動訊號。
The
圖2是圖1實施例的發光二極體顯示裝置100的驅動訊號產生方式的時序圖。其中,在實例(A)中,在一個圖像框週期(frame period)FT中,畫素電路130可比較調變訊號Vsweep1以及資料訊號Vdata1來產生驅動信號Vg1。其中,調變訊號Vsweep1可以為一斜波訊號,資料訊號Vdata1則為一直流訊號。在當調變訊號Vsweep1的電壓大於資料訊號Vdata1時,畫素電路130可使驅動訊號Vg1為致能狀態(具有較高的電壓值)。在當調變訊號Vsweep1的電壓不大於資料訊號Vdata1時,畫素電路130則可使驅動訊號Vg1為禁能狀態(具有較低的電壓值)。因此,根據調變訊號Vsweep1以及資料訊號Vdata1所調變而產生的驅動訊號Vg1可為一方波訊號。
FIG. 2 is a timing diagram of the driving signal generation method of the light emitting
在實例(B)中,驅動訊號Vg2的產生機制與實例(A) 中,驅動訊號Vg1的產生機制相類似,在此不多贅述。值得注意的是,調變訊號Vsweep2的頻率,高於調變訊號Vsweep1的頻率。也就是說,在單一圖像框週期FT中,調變訊號Vsweep2具有的脈波數,多於調變訊號Vsweep1所具有的脈波數。 In the example (B), the generation mechanism of the drive signal Vg2 is the same as that of the example (A) , the generation mechanism of the driving signal Vg1 is similar, and will not be repeated here. It should be noted that the frequency of the modulation signal Vsweep2 is higher than the frequency of the modulation signal Vsweep1. That is to say, in a single image frame period FT, the pulse number of the modulation signal Vsweep2 is more than that of the modulation signal Vsweep1.
在實例(A)、(B)中,一個圖像框週期FT中的調變訊號Vsweep1、Vsweep2以及驅動訊號Vg1、Vg2分別具有多個脈波,其中脈波的數量是關聯於對應顯示列131的顯示資料的灰階值。由於實例(A)與實例(B)所應用的顯示列131的灰階值不相同,因此實例(A)、(B)中對應的調變訊號Vsweep1、Vsweep2以及驅動訊號Vg1、Vg2具有不同數量的脈波。
In the examples (A) and (B), the modulation signals Vsweep1, Vsweep2 and the driving signals Vg1, Vg2 in one image frame period FT respectively have a plurality of pulses, wherein the number of pulses is related to the
在圖像框週期FT中,調變訊號Vsweep1以及驅動訊號Vg1分別具有對應的四個脈波,其中每個脈波佔據1/4個圖像框週期FT(1/4 FT)。 In the image frame period FT, the modulation signal Vsweep1 and the driving signal Vg1 respectively have corresponding four pulses, wherein each pulse occupies 1/4 of the image frame period FT (1/4 FT).
此外,在圖像框週期FT中,調變訊號Vsweep1的其中一個脈波A1的振幅與其他脈波的振幅(以虛線表示)不相同。由於調變訊號Vsweep1在本實施例中為斜波,調變訊號Vsweep1的脈波的振幅最大值又可稱為峰值。在本實施例中,調變訊號Vsweep1的脈波A1的峰值高於其他脈波的峰值。在此配置下,驅動訊號Vg1中對應脈波A1的脈波的致能時間T1比起其他脈波的致能時間較長。 In addition, in the image frame period FT, the amplitude of one pulse A1 of the modulation signal Vsweep1 is different from the amplitudes of other pulses (indicated by dashed lines). Since the modulation signal Vsweep1 is a ramp wave in this embodiment, the maximum amplitude value of the pulse wave of the modulation signal Vsweep1 can also be called a peak value. In this embodiment, the peak value of the pulse wave A1 of the modulation signal Vsweep1 is higher than the peak values of other pulse waves. Under this configuration, the enabling time T1 of the pulse corresponding to the pulse A1 in the driving signal Vg1 is longer than that of other pulses.
如此藉由調變訊號Vsweep1在一個圖像框週期FT中具有多個脈波的配置,使驅動訊號Vg1能在一個圖像框週期FT中 多次致能畫素電路130而多次發光。因此,能降低驅動訊號的占空比而減少畫面閃爍。此外,如此藉由調變訊號Vsweep1的脈波具有不同峰值的配置,能使驅動訊號Vg1以不同的工作時間致能畫素電路130而具有變異的顯示效果。據此,能增加色彩深度(color depth),且顯示低灰階影像時能大幅提升顯示均勻度。 In this way, by configuring the modulation signal Vsweep1 to have multiple pulses in one image frame period FT, the drive signal Vg1 can be configured in one image frame period FT The pixel circuit 130 is enabled multiple times to emit light multiple times. Therefore, the duty cycle of the driving signal can be reduced to reduce screen flickering. In addition, by adjusting the pulse wave of the modulation signal Vsweep1 to have different peak values, the driving signal Vg1 can enable the pixel circuit 130 at different working times to have a variable display effect. Accordingly, the color depth can be increased, and the display uniformity can be greatly improved when displaying low grayscale images.
相較於實例(A),在實例(B)中,在圖像框週期FT中,調變訊號Vsweep2以及驅動訊號Vg2分別具有對應的八個脈波,其中每個脈波佔據1/8個圖像框週期FT(1/8 FT)。 Compared with the example (A), in the example (B), in the image frame period FT, the modulation signal Vsweep2 and the driving signal Vg2 respectively have corresponding eight pulses, wherein each pulse occupies 1/8 Image frame period FT(1/8 FT).
此外,在圖像框週期FT中,調變訊號Vsweep2的脈波A2、A3的振幅與其他脈波的振幅(以虛線表示)不相同,其中脈波A2的振幅可與脈波A3的振幅相同或不相同。在本實施例中,調變訊號Vsweep2的脈波A2、A3的峰值皆高於其他脈波的峰值。在此配置下,驅動訊號Vg2中對應脈波A2、A3的脈波的致能時間T2、T3與其他脈波的致能時間較長。 In addition, in the image frame period FT, the amplitudes of the pulse waves A2 and A3 of the modulation signal Vsweep2 are different from those of other pulse waves (indicated by dotted lines), and the amplitude of the pulse wave A2 can be the same as the amplitude of the pulse wave A3 or not the same. In this embodiment, the peak values of the pulse waves A2 and A3 of the modulation signal Vsweep2 are both higher than the peak values of other pulse waves. Under this configuration, the enabling times T2 and T3 of the pulses corresponding to the pulses A2 and A3 in the driving signal Vg2 are longer than the enabling times of other pulses.
圖3是依照本發明的實施例的發光二極體顯示裝置中的時序控制器以及訊號產生器的實施方式的示意圖。圖4是依照本發明圖3實施例的多個訊號的時序圖,其中的圖像框週期FT1、FT2及FTn為連續的圖像框週期。 FIG. 3 is a schematic diagram of an implementation of a timing controller and a signal generator in a light emitting diode display device according to an embodiment of the present invention. FIG. 4 is a timing diagram of multiple signals according to the embodiment of FIG. 3 of the present invention, wherein the frame periods FT1 , FT2 and FTn are consecutive frame periods.
請參考圖3以及圖4,時序控制器310包括第一控制訊號電路311以及第二控制訊號電路312。第一控制訊號電路311耦接第二控制訊號電路312。第一控制訊號電路311可根據所接收的顯示資料,產生抖動(dithering)資訊DI。第二控制訊號電路312可
產生時脈訊號CK,並可根據抖動資訊DI,處理時脈訊號CK以產生控制訊號VL以及VH。
Please refer to FIG. 3 and FIG. 4 , the
第一控制訊號電路311可為數位電路,或為具運算能力的處理器。第一控制訊號電路311可執行下述的多個步驟。首先,第一控制訊號電路311累加顯示列311的顯示資料的灰階值以產生累加灰階值(步驟S310)。接著,第一控制訊號電路311比對累加灰階值以及預設資訊來產生匹配結果(步驟S320)。預設資訊可為找查表,表示不同的累加灰階值對應所需要的調變訊號的參數,其中參數包括:例如,圖4中調變訊號Vsweep在各圖像框週期FT1、FT2及FTn中各脈波的頻率及振幅分佈。因此,匹配結果指示的資訊包括:例如,圖4在圖像框週期FT中調變訊號Vsweep所需的脈波的頻率及振幅分佈。然後,第一控制訊號電路311根據匹配結果,決定脈波數量(步驟S330)。脈波數量可為對應的圖像框週期的脈波的數量,例如圖4中圖像框週期FT1、FTn分別為4個與6個。
The first
接著,第一控制訊號電路311可針對顯示列311的顯示資料執行抖動計算(步驟S340至步驟S350)。第一控制訊號電路311根據脈波數量,產生攪碼(scrambler)序列(步驟S340)。攪碼序列指示訊號的脈波的編碼資訊,其中編碼資訊包括:例如,具有第一振幅的脈波的第一數量、具有第二振幅的脈波的第二數量以及前述各脈波的時序。舉例來說,在圖4中,攪碼序列指示在各圖像框週期FT1、FT2及FTn中,調變訊號Vsweep的脈波的數量
及時序配置。接著,第一控制訊號電路311根據攪碼序列,產生抖動資訊DI(步驟S350)。抖動資訊DI指示訊號的脈波的峰值分佈。舉例來說,在圖4中,抖動資訊DI指示在各圖像框週期FT1、FT2及FTn中,調變訊號Vsweep的脈波的峰值大小及時序。
Then, the first
在其他實施例中,第一控制訊號電路311可根據顯示列311的顯示資料及發光元件的配置,決定是否執行抖動計算(步驟S340至步驟S350)。舉例來說,如圖4中的圖像框週期FT1所示,若顯示資料的累加灰階值為10位元(bit),且脈波數量指示為4個,則調變訊號Vsweep的每個脈波表示為至少2位元。此時,累加灰階值的最低有效位元(LSB)若具有有效的資料,則根據攪碼序列以及抖動資訊DI,最低有效位元被分配給調變訊號Vsweep在時序P1處的脈波,使得此脈波的峰值高於其他脈波的峰值。因此,調變訊號Vsweep在時序P1處的脈波具有的位元多於其他者,以實現色彩深度的增益。
In other embodiments, the first
回到圖3,第二控制訊號電路312包括脈波產生器3121以及閘控電路3122、3123。脈波產生器3121耦接時序控制器310以及閘控電路3122、3123。脈波產生器3121可根據脈波數量,產生時脈訊號CK。因此,如圖4所示,時脈訊號CK為連續的脈波訊號,且時脈訊號CK在圖像框週期FT1、FT2及FTn中具有關聯於對應的匹配結果的脈波數量。
Returning to FIG. 3 , the second
閘控電路3122、3123可為及閘(AND gate),且耦接於脈波產生器3121。閘控電路3122可接收時脈訊號CK以及抖動資
訊DI。閘控電路3122可根據抖動資訊DI,在第一致能時序期間通過時脈訊號CK,且在第二致能時序期間不通過時脈訊號CK,以產生控制訊號VH。例如,如圖4所示,第一致能時序期間可為時序P1,且第二致能時序期間可為圖像框週期FT1中排除時序P1的其他時序。閘控電路3123可接收時脈訊號CK以及抖動資訊DI。閘控電路3123可根據抖動資訊DI,在第二致能時序期間通過時脈訊號CK,且在第一致能時序期間不通過時脈訊號CK,以產生控制訊號VL。如圖4所示,第一致能時序期間(時序P1)與第二致能時序期間不相互重疊,據以使控制訊號VH、VL被致能期間相互錯開。因此,控制訊號VH、VL的脈波具有不同的時序配置。
The
在其他實施例中,閘控電路3122、3123也可以為其他種類的邏輯閘。本實施例中的及閘僅只是一種範例,不用以限縮本發明的範疇。
In other embodiments, the
回到圖3,訊號產生器320包括斜波電路321以及電壓準位位移電路322、323。電壓準位位移電路322耦接於閘控電路3122與斜波電路321之間,且電壓準位位移電路323耦接於閘控電路3123與斜波電路321之間。斜波電路321更耦接於顯示列131。
Returning to FIG. 3 , the
電壓準位位移電路322可接收控制訊號VH,並可拉高控制訊號VH的脈波的振幅/峰值至第一電壓值。電壓準位位移電路323可接收控制訊號VL,並可降低控制訊號VL的脈波的振幅/峰值至第二電壓值。換言之,具有不同時序的控制訊號VH、VL分別藉由電壓準位位移電路322、323來調整至對應的脈波的峰值,
且經調整後的峰值的第一電壓值與第二電壓值不同。
The voltage
斜波電路321可接收經調整的控制訊號VH、VL,並根據調整的控制訊號VH、VL來產生調變訊號Vsweep。在本實施例中,斜波電路321包括邏輯電路3211以及積分電路3212。邏輯電路3211耦接積分電路3212。邏輯電路3211在圖3中以或閘(OR gate)繪示,並可疊加控制訊號VH、VL以產生控制訊號Vt。積分電路3212包括運算放大器OP、電阻R1、電容C1及二極體D1,並可將控制訊號Vt的波型由方波轉換為斜波,並輸出調變訊號Vsweep。
The
舉例來說,如圖4所示,在圖像框週期FT1中,根據脈波數量,時脈訊號CK具有對應的4個脈波。根據抖動資訊DI,控制訊號VH、VL的脈波的時序配置不同而其致能期間不相互重疊。此外,由於經調整的控制訊號VH、VL的峰值具有不同的電壓值,控制訊號Vt的多個脈波具有不同的電壓值。例如,在圖像框週期FT1中,控制訊號Vt在時序P1處的脈波的峰值高於其他的脈波的峰值,其中的差異以電壓差dV表示。因此,利用控制訊號Vt調變而產生的調變訊號Vsweep在時序P1處的脈波的峰值高於其他的脈波的峰值。 For example, as shown in FIG. 4 , in the image frame period FT1 , according to the number of pulses, the clock signal CK has corresponding 4 pulses. According to the jitter information DI, the timing configurations of the pulses of the control signals VH and VL are different and their enabling periods do not overlap each other. In addition, since the adjusted peak values of the control signals VH and VL have different voltage values, the multiple pulses of the control signal Vt have different voltage values. For example, in the image frame period FT1, the peak value of the pulse wave of the control signal Vt at the time sequence P1 is higher than the peak values of other pulse waves, and the difference is represented by a voltage difference dV. Therefore, the peak value of the pulse wave at the time sequence P1 of the modulated signal Vsweep generated by modulating the control signal Vt is higher than the peak values of other pulse waves.
圖5是依照本發明的實施例的一種畫素電路的示意圖,請參考圖1及圖5。畫素電路500可為圖1中的畫素電路130的另一實施例。畫素電路500包括開關510、調變電路520以及驅動電路530。開關510耦接於掃描驅動器140、資料驅動器150以及
調變電路520。開關510可根據來自掃描驅動器140的掃描訊號Vscan,將資料訊號Vdata輸入至調變電路520。調變電路520包括電容C2及比較器電路CP,並耦接於訊號產生器120以及驅動電路530。調變電路520可比較來自訊號產生器120的調變訊號Vsweep與輸入的資料訊號Vdata以產生驅動訊號Vg。驅動電路530包括多個開關SW1、SW2以及發光二極體發光LED,並可根據驅動訊號Vg以及致能訊號EM來驅動發光二極體LED發光。
FIG. 5 is a schematic diagram of a pixel circuit according to an embodiment of the present invention, please refer to FIG. 1 and FIG. 5 . The
回到圖4及圖5,在本實施例中,調變電路520可透過調變訊號Vsweep來針對資料訊號Vdata進行調變,據以產生驅動訊號Vg。舉例來說,在圖像框週期FT1中,由於資料訊號Vdata為定電壓訊號且調變訊號Vsweep在時序P1處的脈波的峰值較其他者高,因此驅動訊號Vg在時序P1處的脈波的致能期間較其他者長,其中的差異以時間差dt表示。在此配置下,在一個圖像框週期FT1中,由於驅動訊號Vg具有多個脈波,發光二極體LED能多次發光而減少畫面閃爍。此外,在圖像框週期FT1中,由於驅動訊號Vg的其中一個脈波(或也可以是多個脈波)具有較長的致能期間,發光二極體LED能發光較長的時間而增加色彩深度。
Referring back to FIG. 4 and FIG. 5 , in this embodiment, the modulating
圖6是依照本發明的實施例的一種發光二極體顯示裝置的驅動方法的流程圖,請參考圖6。驅動方法可包括下列步驟。首先,根據顯示資料以提供第一控制訊號以及第二控制訊號(步驟S610)。顯示資料可為圖1中的顯示列311的顯示資料的灰階值,且第一控制訊號以及第二控制訊號分別可為圖1、圖3至圖4中的
控制訊號VH、VL。接著,根據第一控制訊號以及該第二控制訊號,產生並提供調變訊號至顯示列(步驟S620)。調變訊號在一個圖像框週期中具有多個脈波。調變訊號可為圖1、圖3至圖5中的調變訊號Vsweep,或者可為圖2中的調變訊號Vsweep1或Vsweep2。一個圖像框週期可為圖4中的圖像框週期FT1至FTn其中之一或可為圖2中的圖像框週期FT。接著,根據以調變訊號調變而產生的驅動訊號,在圖像框週期中,多次驅動顯示列中的多個發光元件(步驟S630)。發光元件可為圖5中的發光二極體。
FIG. 6 is a flowchart of a driving method of a light emitting diode display device according to an embodiment of the present invention, please refer to FIG. 6 . The driving method may include the following steps. Firstly, a first control signal and a second control signal are provided according to the display data (step S610). The display data can be the gray scale value of the display data of the
關於上述步驟的實施細節,在前述的實施例以及多個實施方式中已有詳細的說明,在此恕不多贅述。 The implementation details of the above steps have been described in detail in the foregoing embodiments and multiple implementation manners, and will not be repeated here.
綜上所述,本發明實施例的發光二極體顯示裝置及其驅動方法能藉由時序控制器及訊號產生器來產生調變訊號。調變訊號在一個圖像框週期中具有多個脈波,以使根據此調變訊號而產生的驅動訊號亦在對應的圖像框週期中具有多個脈波。如此一來,在圖像框週期中,能多次驅動發光元件而減少畫面閃爍並提升顯示均勻度。在部分實施例中,調變訊號是根據經抖動處理的訊號而產生的,因此在一個圖像框週期中,調變訊號可為零個至多個脈波峰值相異於其他脈波的峰值,而可進一步使驅動訊號具有對應的脈波寬度。據此,在圖像框週期中,能顯示更多變的資料而增加色彩深度。 To sum up, the light-emitting diode display device and the driving method thereof of the embodiments of the present invention can generate modulation signals through the timing controller and the signal generator. The modulation signal has multiple pulses in one image frame period, so that the driving signal generated according to the modulation signal also has multiple pulses in the corresponding image frame period. In this way, in the image frame period, the light-emitting element can be driven multiple times to reduce screen flicker and improve display uniformity. In some embodiments, the modulated signal is generated according to the dithered signal, so in one image frame period, the modulated signal may have zero to multiple pulse peaks different from other pulse peaks, And the driving signal can be further made to have a corresponding pulse width. Accordingly, in the image frame period, more variable information can be displayed and the color depth can be increased.
雖然本發明已以實施例揭露如上,然其並非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明的精 神和範圍內,當可作些許的更動與潤飾,故本發明的保護範圍當視後附的申請專利範圍所界定者為準。 Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Within the spirit and scope, some changes and modifications can be made, so the protection scope of the present invention should be defined by the scope of the appended patent application.
100:發光二極體顯示裝置 100: Light-emitting diode display device
110:時序控制器 110: Timing controller
120:訊號產生器 120: Signal generator
130:畫素電路 130: Pixel circuit
131:顯示列 131: Display columns
132:顯示行 132: Display line
140:掃描驅動器 140: scan driver
150:資料驅動器 150:Data drive
Vdata:資料訊號 Vdata: data signal
Vscan:掃描訊號 Vscan: scan signal
Vsweep:調變訊號 Vsweep: modulation signal
VH、VL:控制訊號 VH, VL: control signal
Claims (10)
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