TWI734287B - Display device and display panel - Google Patents
Display device and display panel Download PDFInfo
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- TWI734287B TWI734287B TW108144496A TW108144496A TWI734287B TW I734287 B TWI734287 B TW I734287B TW 108144496 A TW108144496 A TW 108144496A TW 108144496 A TW108144496 A TW 108144496A TW I734287 B TWI734287 B TW I734287B
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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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
Description
本發明是有關於一種顯示裝置與顯示面板,且特別是有關於一種可避免鬼影現象之顯示裝置與顯示面板。 The present invention relates to a display device and a display panel, and more particularly to a display device and a display panel that can avoid the ghost phenomenon.
請參見第1圖,其係習用的LED顯示裝置之示意圖。LED顯示裝置10包含LED顯示面板11、時序控制器13、列控制器15與行控制器17。其中,假設LED顯示面板11包含排列為M行與N列的多個子像素電路SP(1,1)~SP(M,N)。M與N均為正整數。若LED顯示裝置10為單色顯示器時,M為正整數。若LED顯示裝置10為彩色顯示器時,M為3的倍數。此外,行控制器17進一步包含移位暫存器(shift register)12、開關暫存器(ON/OFF register)/栓鎖器(latch)14與M個開關sw1、sw2、swM等。
Please refer to Figure 1, which is a schematic diagram of a conventional LED display device. The
首先,由時序控制器13產生時序控制信號至列控制器15與行控制器17。接著,列控制器15根據時序控制信號產生N個閘極控制信號GC[1]~GC[N],分別用於選取位於N列的子像素電路SP(1,1)~SP(M,N)。此外,行控制器17則根據時序控制信號產生M個資料電壓(data voltage),分別供應排列為M行的子像素電路SP(1,1)~SP(M,N)。為便於說明,本文以相同的符號同時代表信號線與經由該信號線
所傳送的信號。例如,以GC[1]同時代表與第一列的子像素SP(1,1)~SP(M,1)電連接的閘極控制線,以及傳送至第一列的子像素SP(1,1)~SP(M,1)的閘極控制信號。
First, the timing controller 13 generates timing control signals to the
在第1圖中,每個子像素電路SP(1,1)~SP(M,N)包含一個發光元件(例如,發光二極體LED)。發光二極體LED的陽極電連接於一閘極控制線GC[1]~GC[N],且其陰極電連接於一資料線S[1]~S[M]。由於閘極控制線GC[1]~GC[N]與資料線S[1]~S[M]之間存在電壓差,在每個發光二極體LED的兩極之間存在寄生電容Cp。例如,在子像素電路SP(1,1)中,包含一個發光二極體LED以及介於閘極控制線GC[1]和資料線S[1]~S[M]S[1]之間的寄生電容Cp。同理,在子像素電路SP(M,N)中,包含一個發光二極體LED,以及在閘極控制信號GC[N]和資料線S[M]之間形成的寄生電容Cp。 In Figure 1, each sub-pixel circuit SP(1,1)-SP(M,N) includes a light-emitting element (for example, a light-emitting diode LED). The anode of the light emitting diode LED is electrically connected to a gate control line GC[1]~GC[N], and its cathode is electrically connected to a data line S[1]~S[M]. Since there is a voltage difference between the gate control line GC[1]~GC[N] and the data line S[1]~S[M], there is a parasitic capacitance Cp between the two poles of each light-emitting diode LED. For example, in the sub-pixel circuit SP(1,1), it includes a light-emitting diode LED and is located between the gate control line GC[1] and the data line S[1]~S[M]S[1] The parasitic capacitance Cp. Similarly, the sub-pixel circuit SP(M, N) includes a light emitting diode LED and a parasitic capacitance Cp formed between the gate control signal GC[N] and the data line S[M].
接著,以位於第m行與第n列的子像素SP(m,n)為例,說明習用的LED顯示面板11可能因為寄生電容Cp的存在而衍生鬼影現象。子像素電路SP(m,n)電連接於資料線S[m]與閘極控制線GC[n]。其中,m小於或等於M,n小於或等於N,且m、n均為正整數。
Next, taking the sub-pixel SP(m,n) located in the mth row and the nth column as an example, it is explained that the conventional
請參見第2圖,其係藉由改變閘極控制信號GC[n]的位準,選取第n列的子像素電路SP(1,n)~SP(M,n)之示意圖形。當閘極控制信號GC[n]在ta時點由低位準(L)切換至高位準(H)時,代表時序控制器13選擇位於第n列的子像素電路SP(1,n)~SP(M,n)發光。當閘極控制信號GC[n]在tb時點由高位準(H)切換至低位準(L)時,代表時序控制器13並未選取位於第n列的子像素電路SP(1,n)~SP(M,n)。 Please refer to FIG. 2, which is a schematic diagram of selecting the sub-pixel circuits SP(1,n)~SP(M,n) in the nth column by changing the level of the gate control signal GC[n]. When the gate control signal GC[n] switches from a low level (L) to a high level (H) at time ta, it means that the timing controller 13 selects the sub-pixel circuits SP(1,n)~SP( M, n) emit light. When the gate control signal GC[n] switches from a high level (H) to a low level (L) at time tb, it means that the timing controller 13 does not select the sub-pixel circuit SP(1,n) in the nth column~ SP(M,n).
請參見第3A圖,其係時序控制器選擇習用的LED顯示面板中的子像素電路SP(m,n)發光時,流經子像素電路SP(m,n)的電流流向之示意圖。請同時參見第2圖與第3A圖。在ta時點,當時序控制器13選擇子像素電路SP(m,n)發光時,閘極控制信號GC[n]由低位準(L)切換至高位準(H)。此時,資料電流ip自閘極控制線GC[n]流經發光二極體LED至資料線S[m]。發光二極體LED因資料電流ip的流經而導通並發光,且資料電流ip的大小由一電流源決定。關於如何利用電流源控制子像素電路SP(m,n)的亮度等細節,本文不予詳述。在ta時點至tb時點的這段期間,位於子像素電路SP(m,n)的寄生電容Cp也因閘極控制線GC[n]和資料線S[m]之間的壓差而被充電。 Please refer to FIG. 3A, which is a schematic diagram of the current flowing through the sub-pixel circuit SP(m,n) when the timing controller selects the sub-pixel circuit SP(m,n) in the conventional LED display panel to emit light. Please refer to Figure 2 and Figure 3A at the same time. At time ta, when the timing controller 13 selects the sub-pixel circuit SP(m,n) to emit light, the gate control signal GC[n] switches from a low level (L) to a high level (H). At this time, the data current ip flows from the gate control line GC[n] through the light emitting diode LED to the data line S[m]. The light emitting diode LED is turned on and emits light due to the flow of the data current ip, and the size of the data current ip is determined by a current source. The details of how to use the current source to control the brightness of the sub-pixel circuit SP(m,n) will not be described in detail in this article. During the period from time ta to time tb, the parasitic capacitance Cp located in the sub-pixel circuit SP(m,n) is also charged due to the voltage difference between the gate control line GC[n] and the data line S[m] .
請參見第3B圖,其係習用的LED顯示面板中的子像素電路SP(m,n),在未被時序控制器選定發光時的電流流向之示意圖。請同時參見第2圖與第3B圖。當時序控制器13未選取子像素電路SP(m,n)並時,閘極控制信號GC[n]在tb時點由高位準(H)切換至低位準(L)。理想狀況下,此時的發光二極體LED將因陽極的閘極控制信號GC[n]為低位準(L)的緣故而停止發光。但是,因為寄生電容Cp先前曾在ta時點至tb時點的期間蓄積電荷的緣故,導致在tb時點後,將從寄生電容Cp產生一放電電流id。放電電流id自寄生電容Cp流出後,先流經發光二極體LED,再流至資料線S[m]。因此,儘管時序控制器13在tb時點過後並未選取子像素電路SP(m,n),子像素電路SP(m,n)仍因放電電流id的流經而發光。 Please refer to FIG. 3B, which is a schematic diagram of the current flow of the sub-pixel circuit SP(m,n) in the conventional LED display panel when it is not selected by the timing controller to emit light. Please refer to Figure 2 and Figure 3B at the same time. When the timing controller 13 does not select the sub-pixel circuit SP(m,n), the gate control signal GC[n] switches from the high level (H) to the low level (L) at the time tb. Under ideal conditions, the light-emitting diode LED at this time will stop emitting light because the anode gate control signal GC[n] is at a low level (L). However, because the parasitic capacitance Cp previously accumulated charge during the period from the time ta to the time tb, a discharge current id will be generated from the parasitic capacitance Cp after the time tb. After the discharge current id flows out from the parasitic capacitance Cp, it first flows through the light emitting diode LED, and then flows to the data line S[m]. Therefore, even though the timing controller 13 does not select the sub-pixel circuit SP(m,n) after the time tb, the sub-pixel circuit SP(m,n) still emits light due to the flow of the discharge current id.
由於寄生電容Cp在ta時點至tb時點的期間所累積的電荷量有限,發光二極體LED在tb時點過後所發出的光線,也相對較在ta時點至tb時點的期間所發出的光線弱。此種在子像素電路SP(m,n)並未實際被時序控制器13所選取,但子像素電路SP(m,n)內的發光二極體LED仍因寄生電容Cp的放電而引起衍生放電電流id進而發光的現象,將對使用者觀看顯示畫面時的視覺效果產生影響。此種非預期的LED發光的情況稱為鬼影現象。鬼影現象為LED顯示面板的製造商欲解決的問題。 Since the amount of charge accumulated by the parasitic capacitance Cp from time ta to time tb is limited, the light emitted by the light emitting diode LED after time tb is relatively weaker than the light emitted from time ta to time tb. Such a sub-pixel circuit SP (m, n) is not actually selected by the timing controller 13, but the light-emitting diode LED in the sub-pixel circuit SP (m, n) is still derived from the discharge of the parasitic capacitance Cp The phenomenon of the discharge current id and then the light will have an impact on the visual effect of the user when viewing the display screen. This kind of unexpected LED light emission is called ghosting phenomenon. The ghosting phenomenon is a problem that LED display panel manufacturers want to solve.
本發明係有關於一種可避免鬼影現象的顯示裝置與顯示面板。在顯示面板的子像素電路中,設置選擇電路與發光電路。在發光電路中,包含彼此並聯的旁路電晶體與發光元件。當子像素電路內的發光元件被時序控器選取時,旁路電晶體斷開。反之,當子像素電路內的發光元件未被選取時,旁路電晶體將導通,進而使發光元件因兩端的電壓小於順向電壓Vf而不發光。 The invention relates to a display device and a display panel capable of avoiding ghosting phenomenon. In the sub-pixel circuit of the display panel, a selection circuit and a light-emitting circuit are provided. The light-emitting circuit includes bypass transistors and light-emitting elements connected in parallel with each other. When the light-emitting element in the sub-pixel circuit is selected by the timing controller, the bypass transistor is disconnected. Conversely, when the light-emitting element in the sub-pixel circuit is not selected, the bypass transistor will be turned on, so that the light-emitting element does not emit light because the voltage across it is less than the forward voltage Vf.
根據本發明之一方面,提出一種包含顯示面板的顯示裝置。顯示面板包含第一選擇電路與第一發光電路。第一選擇電路包含第一選擇電晶體,而第一發光電路包含第一旁路電晶體與第一發光元件。第一選擇電晶體電連接於供應電壓、第一閘極控制線以及第一分支節點。第一選擇電晶體根據第一閘極控制線的位準而選擇性導通。第一旁路電晶體電連接於第一分支節點、第一放電選擇線與第一資料線。第一旁路電晶體根據第一放電選 擇線的位準而選擇性導通。第一發光元件電連接於第一分支節點與第一資料線。於第一發光期間,第一選擇電晶體為導通,且第一旁路電晶體為斷開。此時,第一資料電流自第一供應電壓流經第一選擇電晶體、第一分支節點與第一發光元件至第一資料線。其中,第一發光元件的亮度根據第一資料電流而決定。 According to one aspect of the present invention, a display device including a display panel is provided. The display panel includes a first selection circuit and a first light-emitting circuit. The first selection circuit includes a first selection transistor, and the first light-emitting circuit includes a first bypass transistor and a first light-emitting element. The first selection transistor is electrically connected to the supply voltage, the first gate control line and the first branch node. The first selection transistor is selectively turned on according to the level of the first gate control line. The first bypass transistor is electrically connected to the first branch node, the first discharge selection line and the first data line. The first bypass transistor is selected according to the first discharge Select the level of the line to selectively turn on. The first light-emitting element is electrically connected to the first branch node and the first data line. During the first light-emitting period, the first selection transistor is turned on, and the first bypass transistor is turned off. At this time, the first data current flows from the first supply voltage through the first selection transistor, the first branch node and the first light-emitting element to the first data line. Wherein, the brightness of the first light-emitting element is determined according to the first data current.
根據本發明之另一方面,提出一種顯示面板。顯示面板包含:第一選擇電路與第一發光電路。第一選擇電路包含第一選擇電晶體,而第一發光電路包含第一旁路電晶體與第一發光元件。第一選擇電晶體電連接於供應電壓、第一閘極控制線以及第一分支節點。第一選擇電晶體根據第一閘極控制線的位準而選擇性導通。第一旁路電晶體電連接於第一分支節點、第一放電選擇線與第一資料線。第一旁路電晶體根據第一放電選擇線的位準而選擇性導通。第一發光元件,電連接於第一分支節點與第一資料線。於第一發光期間,第一選擇電晶體為導通,且第一旁路電晶體為斷開。此時,第一資料電流自第一供應電壓流經第一選擇電晶體、第一分支節點與第一發光元件至第一資料線。其中,第一發光元件的亮度根據第一資料電流而決定。 According to another aspect of the present invention, a display panel is provided. The display panel includes: a first selection circuit and a first light-emitting circuit. The first selection circuit includes a first selection transistor, and the first light-emitting circuit includes a first bypass transistor and a first light-emitting element. The first selection transistor is electrically connected to the supply voltage, the first gate control line and the first branch node. The first selection transistor is selectively turned on according to the level of the first gate control line. The first bypass transistor is electrically connected to the first branch node, the first discharge selection line and the first data line. The first bypass transistor is selectively turned on according to the level of the first discharge selection line. The first light-emitting element is electrically connected to the first branch node and the first data line. During the first light-emitting period, the first selection transistor is turned on, and the first bypass transistor is turned off. At this time, the first data current flows from the first supply voltage through the first selection transistor, the first branch node and the first light-emitting element to the first data line. Wherein, the brightness of the first light-emitting element is determined according to the first data current.
為了對本發明之上述及其他方面有更佳的瞭解,下文特舉實施例,並配合所附圖式詳細說明如下: In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows:
10:LED顯示裝置 10: LED display device
13:時序控制器 13: Timing controller
15:列控制器 15: Column controller
11:LED顯示面板 11: LED display panel
17:行控制器 17: Row controller
14:栓鎖器 14: Latch
12:移位暫存器 12: shift register
VLED:發光二極體電壓 V LED : Light-emitting diode voltage
GC[1]、GC[2]、GC[N]、GC[n]、GCr[n]、GCg[n]、GCb[n]、GCr[1]、GCg[1]、GCb[1]、GCr[2]、GCg[2]、GCb[2]、GCr[3]、GCg[3]、GCb[3]:閘極控制線(信號) GC[1], GC[2], GC[N], GC[n], GCr[n], GCg[n], GCb[n], GCr[1], GCg[1], GCb[1], GCr[2], GCg[2], GCb[2], GCr[3], GCg[3], GCb[3]: gate control line (signal)
S[1]、S[2]、S[M]、Sr[x]、Sg[x]、Sb[x]、Sr[1]、Sg[1]、Sb[1]、Sr[2]、Sg[2]、Sb[2]、S[3]、S[4]、S[5]、S[6]:資料信號 S[1], S[2], S[M], Sr[x], Sg[x], Sb[x], Sr[1], Sg[1], Sb[1], Sr[2], Sg[2], Sb[2], S[3], S[4], S[5], S[6]: data signal
LED、LEDr、LEDg、LEDb:發光二極體 LED, LEDr, LEDg, LEDb: light-emitting diode
SP(1,1)、SP(2,1)、SP(M,1)、SP(1,2)、SP(2,2)、SP(M,2))、SP(1,N)、SP(2,N)、SP(M,N)、SP(m,n):子像素電路 SP(1,1), SP(2,1), SP(M,1), SP(1,2), SP(2,2), SP(M,2)), SP(1,N), SP(2,N), SP(M,N), SP(m,n): sub-pixel circuit
sw1、sw2、swM、sw[1]、sw[2]、sw[3]、sw[4]、sw[5]、sw[6]、swG1、swG2:開關 sw1, sw2, swM, sw[1], sw[2], sw[3], sw[4], sw[5], sw[6], swG1, swG2: switch
Cp:寄生電容 Cp: Parasitic capacitance
ta、tb、t0、t1、t2、t3、t4、t5、t6、t7、t8、t9、t10、tc、td:時點 ta, tb, t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, tc, td: time point
ip、ispr、ispg、ispb:資料電流 ip, ispr, ispg, ispb: data current
id、idg、idb、idr:放電電流 id, idg, idb, idr: discharge current
Vdd[n]、Vdd[1]、Vdd[2]、Vdd[3]:供應電壓 Vdd[n], Vdd[1], Vdd[2], Vdd[3]: supply voltage
DS[n]、DSr[n]、DSg[n]、DSb[n]、DSr[1]、DSg[1]、DSb[1]、DSr[2]、DSg[2]、DSb[2]、DSr[3]、DSg[3]、DSb[3]:放電選擇線(信號) DS[n], DSr[n], DSg[n], DSb[n], DSr[1], DSg[1], DSb[1], DSr[2], DSg[2], DSb[2], DSr[3], DSg[3], DSb[3]: discharge selection line (signal)
selTFT:選擇電晶體 selTFT: select transistor
bpTFT、bpTFTr、bpTFTg、bpTFTb:旁路電晶體 bpTFT, bpTFTr, bpTFTg, bpTFTb: bypass transistor
Nbr、Nbrr、Nbrg、Nbrb:分支節點 Nbr, Nbrr, Nbrg, Nbrb: branch nodes
Vbr:分支電壓 Vbr: branch voltage
LC:發光電路 LC: Light-emitting circuit
SC、SC[1]、SC[2]、SC[3]:選擇電路 SC, SC[1], SC[2], SC[3]: select circuit
P(x,n)、P(1,1)、P(2,1)、P(1,2)、P(2,2)、P(1,3)、P(2,3):像素電路 P(x,n), P(1,1), P(2,1), P(1,2), P(2,2), P(1,3), P(2,3): pixels Circuit
SCr:紅色選擇電路 SCr: Red selection circuit
SCg:綠色選擇電路 SCg: Green selection circuit
SCb:藍色選擇電路 SCb: Blue selection circuit
LCr:紅色發光電路 LCr: red light-emitting circuit
LCg:綠色發光電路 LCg: Green light-emitting circuit
LCb:藍色發光電路 LCb: blue light-emitting circuit
Tp:像素顯示期間 Tp: During pixel display
Tspr、Tspg、Tspb:子像素發光期間 Tspr, Tspg, Tspb: Sub-pixel emission period
Senr[1]、Seng[1]、Senb[1]、Senr[2]、Seng[2]、Senb[2]、SenG1、SenG2:資料線(信號) Senr[1], Seng[1], Senb[1], Senr[2], Seng[2], Senb[2], SenG1, SenG2: data line (signal)
Isrc[1]、Isrc[2]、Isrc[3]、Isrc[4]、Isrc[5]、Isrc[6]、IsrcG1、IsrcG2:電流源 Isrc[1], Isrc[2], Isrc[3], Isrc[4], Isrc[5], Isrc[6], IsrcG1, IsrcG2: current source
Tr[1]、Tr[2]、Tr[3]:列發光期間 Tr[1], Tr[2], Tr[3]: during column light emission
22、32、39:GOA 22, 32, 39: GOA
21、37:微驅動電路 21, 37: Micro drive circuit
31:顯示面板 31: display panel
33:TFT陣列 33: TFT array
35:LED陣列 35: LED array
第1圖,其係習用的LED顯示裝置之示意圖。 Figure 1 is a schematic diagram of a conventional LED display device.
第2圖,其係藉由改變閘極控制信號GC[n]的位準,選取第n列的子像素電路SP(1,n)~SP(M,n)之示意圖形。 Fig. 2 is a schematic diagram of selecting the sub-pixel circuits SP(1,n)~SP(M,n) in the nth column by changing the level of the gate control signal GC[n].
第3A圖,其係習用的LED顯示面板中的子像素電路SP(m,n),被時序控制器選定發光時的電流流向之示意圖。 FIG. 3A is a schematic diagram of the current flow when the sub-pixel circuit SP(m,n) in the conventional LED display panel is selected by the timing controller to emit light.
第3B圖,其係習用的LED顯示面板中的子像素電路SP(m,n),在未被時序控制器選定發光時的電流流向之示意圖。 FIG. 3B is a schematic diagram of the current flow of the sub-pixel circuit SP(m,n) in the conventional LED display panel when it is not selected by the timing controller to emit light.
第4A圖,其係本揭露的子像素電路SP(m,n)的一種實施例之示意圖。 FIG. 4A is a schematic diagram of an embodiment of the sub-pixel circuit SP(m,n) of the present disclosure.
第4B圖,其係改變閘極控制信號GC[n]的位準,作為選取第4A圖的子像素電路SP(m,n)之發光與否的示意圖。 Fig. 4B is a schematic diagram of changing the level of the gate control signal GC[n] as a schematic diagram of selecting whether the sub-pixel circuit SP(m,n) in Fig. 4A emits light.
第5A圖,其係子像素電路SP(m,n)被時序控制器選定發光時的電流流向之示意圖。 FIG. 5A is a schematic diagram of the current flow when the sub-pixel circuit SP(m,n) is selected by the timing controller to emit light.
第5B圖,其係子像素電路SP(m,n)未被時序控制器選定發光時的電流流向之示意圖 Figure 5B, which is a schematic diagram of the current flow when the sub-pixel circuit SP(m,n) is not selected by the timing controller to emit light
第6A圖,其係彩色的像素電路採用第4A圖之架構的示意圖。 Fig. 6A is a schematic diagram of the structure of Fig. 4A used in the color pixel circuit.
第6B圖,其係與第6A圖的像素電路相關之控制信號的波形圖。 Fig. 6B is a waveform diagram of control signals related to the pixel circuit of Fig. 6A.
第7A圖,其係將前述實施例的子像素電路組合成為LED顯示面板之示意圖。 FIG. 7A is a schematic diagram of combining the sub-pixel circuits of the foregoing embodiments into an LED display panel.
第7B圖,其係與第7A圖的像素電路相關之控制信號的波形圖。 Fig. 7B is a waveform diagram of control signals related to the pixel circuit of Fig. 7A.
第8圖,其係基於第6圖所示的LED顯示面板,進一步搭配解多工器(demultiplexer)控制之示意圖。 Fig. 8 is a schematic diagram based on the LED display panel shown in Fig. 6 further equipped with a demultiplexer control.
第9圖,其係控制第8圖所示之LED顯示面板的波形圖。 Figure 9 is a waveform diagram for controlling the LED display panel shown in Figure 8.
第10A、10B圖,其係將本案的LED顯示面板搭配微驅動電路使用之示意圖。 Figures 10A and 10B are schematic diagrams of using the LED display panel of this case with a micro-drive circuit.
第11圖,其係依照本揭露的另一種LED顯示面板的實施例之示意圖。 FIG. 11 is a schematic diagram of another embodiment of the LED display panel according to the present disclosure.
第12圖,其係第11圖所示之LED顯示面板中的第一種類型的像素電路P(x,n)之示意圖。 Fig. 12 is a schematic diagram of the first type of pixel circuit P(x, n) in the LED display panel shown in Fig. 11.
第13圖,其係改變閘極控制信號GC[n]的位準,作為選取第12圖的像素電路P(x,n)之發光與否的示意圖。 Figure 13 is a schematic diagram of changing the level of the gate control signal GC[n] as a schematic diagram for selecting whether the pixel circuit P(x,n) in Figure 12 emits light.
第14A、14B、14C、14D圖,其係第14圖的像素電路P(x,n)因應時序控制器的控制與選擇而運作與相關的電流流向之示意圖。 Figures 14A, 14B, 14C, and 14D are schematic diagrams of the operation of the pixel circuit P(x, n) in Figure 14 in response to the control and selection of the timing controller and the related current flow.
第15圖,其係第11圖所示之LED顯示面板中的第二種類型的像素電路P(x,n)(其中x=2~M/3,且n=1~N)之示意圖。 Figure 15 is a schematic diagram of the second type of pixel circuit P(x,n) (where x=2~M/3, and n=1~N) in the LED display panel shown in Figure 11.
第16圖,其係改變閘極控制信號GC[n]的位準,作為選取第13圖的像素電路P(x,n)(其中x=2~M/3,且n=1~N)之發光與否的示意圖。 Figure 16 changes the level of the gate control signal GC[n] as the pixel circuit P(x,n) of Figure 13 (where x=2~M/3, and n=1~N) Schematic diagram of whether it is luminous or not.
第17A、17B、17C、17D圖,其係第15圖的像素電路P(x,n)因應時序控制器的控制與選擇而運作與相關的電流流向之示意圖。 Figures 17A, 17B, 17C, and 17D are schematic diagrams of the operation of the pixel circuit P(x, n) in Figure 15 in response to the control and selection of the timing controller and the related current flow.
第18圖,其係控制第11圖所示之LED顯示面板的波形圖。 Figure 18 is a waveform diagram for controlling the LED display panel shown in Figure 11.
如前所述,由於寄生電容Cp的存在,導致習用的LED顯示面板產生鬼影現象並影響使用者的視覺感受。為此,本揭露的實施例提供不同於習用技術的LED子像素電路。採用本發明實施例的LED 子像素電路可避免因寄生電容Cp的存在而導致的鬼影現象。以下說明雖以彩色LED顯示面板為主,但本發明亦可應用於單色LED顯示面板。此外,其他非採用發光二極體LED作為發光元件的顯示面板,亦可透過類似的方式改善鬼影現象。 As mentioned above, due to the existence of the parasitic capacitance Cp, the conventional LED display panel produces a ghosting phenomenon and affects the user's visual experience. To this end, the embodiments of the present disclosure provide LED sub-pixel circuits that are different from conventional technologies. LED adopting embodiment of the present invention The sub-pixel circuit can avoid the ghosting phenomenon caused by the existence of the parasitic capacitance Cp. Although the following description focuses on color LED display panels, the present invention can also be applied to monochromatic LED display panels. In addition, other display panels that do not use light-emitting diode LEDs as light-emitting elements can also improve the ghosting phenomenon in a similar manner.
請參見第4A圖,其係根據本揭露構想的子像素電路SP(m,n)的實施例之示意圖。子像素電路SP(m,n)電連接於第n列的列供應電壓Vdd[n]、閘極控制線GC[n]、放電選擇(discharge selection)線DS[n]與資料線S[m]。其中,列供應電壓Vdd[n]始終維持在高電壓(例如,電壓為6伏特的發光二極體電壓VLED)。 Please refer to FIG. 4A, which is a schematic diagram of an embodiment of the sub-pixel circuit SP(m,n) according to the present disclosure. The sub-pixel circuit SP(m,n) is electrically connected to the column supply voltage Vdd[n] of the nth column, the gate control line GC[n], the discharge selection line DS[n] and the data line S[m] ]. Among them, the column supply voltage Vdd[n] is always maintained at a high voltage (for example, the light-emitting diode voltage V LED with a voltage of 6 volts).
子像素電路SP(m,n)包含:選擇電路(selection circuit,簡稱為SC)與發光電路(lightening circuit,簡稱為LC)。選擇電路SC包含選擇電晶體selTFT,而發光電路LC包含彼此並聯的旁路電晶體bpTFT與發光二極體LED。為便於說明,在本文中,假設選擇電晶體selTFT與旁路電晶體bpTFT均為P型薄膜電晶體,但實際應用時,選擇電晶體selTFT與旁路電晶體bpTFT可能均為N型薄膜電晶體;或者,選擇電晶體selTFT與旁路電晶體bpTFT的其中一者為P型薄膜電晶體、另一者為N型薄膜電晶體。其中,在選擇電晶體selTFT的閘極與汲極之間可能存在寄生電容Cp。 The sub-pixel circuit SP (m, n) includes a selection circuit (SC for short) and a lightening circuit (LC for short). The selection circuit SC includes a selection transistor selTFT, and the light-emitting circuit LC includes a bypass transistor bpTFT and a light-emitting diode LED connected in parallel with each other. For the convenience of explanation, in this article, it is assumed that the selected transistor selTFT and the bypass transistor bpTFT are both P-type thin film transistors, but in actual applications, the selected transistor selTFT and the bypass transistor bpTFT may both be N-type thin film transistors. Or, one of the selTFT and the bypass transistor bpTFT is selected as a P-type thin film transistor, and the other is an N-type thin film transistor. Among them, there may be a parasitic capacitance Cp between the gate and drain of the selective transistor selTFT.
選擇電晶體selTFT的源極電連接於列供應電壓Vdd[n]、閘極接收閘極控制信號GC[nc]、汲極電連接於分支節點Nbr。為便於說明,本文將分支節點Nbr的電壓定義為分支電壓Vbr。在發光電路中,發光二極體LED與旁路電晶體bpTFT彼此並聯。其中,發光 二極體LED的陽極與旁路電晶體bpTFT的源極電連接於分支節點Nbr。發光二極體LED的陰極與旁路電晶體bpTFT的汲極電連接於資料線S[m]。旁路電晶體bpTFT的閘極接收放電選擇信號DS[n]。 The source of the selection transistor selTFT is electrically connected to the column supply voltage Vdd[n], the gate receives the gate control signal GC[nc], and the drain is electrically connected to the branch node Nbr. For ease of description, this article defines the voltage of the branch node Nbr as the branch voltage Vbr. In the light-emitting circuit, the light-emitting diode LED and the bypass transistor bpTFT are connected in parallel with each other. Among them, luminous The anode of the diode LED and the source of the bypass transistor bpTFT are electrically connected to the branch node Nbr. The cathode of the light emitting diode LED and the drain of the bypass transistor bpTFT are electrically connected to the data line S[m]. The gate of the bypass transistor bpTFT receives the discharge selection signal DS[n].
請參見第4B圖,其係改變閘極控制信號GC[n]的位準,作為選取第4A圖的子像素電路SP(m,n)之發光與否的示意圖。在ta時點,閘極控制信號GC[n]由高位準(H)轉換至低位準(L),且放電選擇信號DS[n]由低位準(L)轉換至高位準(H)。在tb時點,閘極控制信號GC[n]由低位準(L)轉換至高位準(H),且放電選擇信號DS[n]由高位準(H)轉換至低位準(L)。例如,閘極控制信號GC[n]與放電選擇信號DS[n]的高位準(H)的電壓值可為8伏特,閘極控制信號GC[n]與放電選擇信號DS[n]的低位準(L)的電壓值可為-10伏特)。 Please refer to FIG. 4B, which changes the level of the gate control signal GC[n] as a schematic diagram of selecting whether the sub-pixel circuit SP(m,n) in FIG. 4A emits light. At time ta, the gate control signal GC[n] is converted from a high level (H) to a low level (L), and the discharge selection signal DS[n] is converted from a low level (L) to a high level (H). At time tb, the gate control signal GC[n] is converted from a low level (L) to a high level (H), and the discharge selection signal DS[n] is converted from a high level (H) to a low level (L). For example, the voltage value of the high level (H) of the gate control signal GC[n] and the discharge selection signal DS[n] can be 8 volts, and the low level of the gate control signal GC[n] and the discharge selection signal DS[n] The voltage value of the standard (L) can be -10 volts).
若選擇電晶體selTFT與旁路電晶體bpTFT為同類型的電晶體時(例如,同為P型或同為N型),閘極控制信號GC[n]與放電選擇信號DS[n]的位準維持反向。或者,若選擇電晶體selTFT與旁路電晶體bpTFT為不同類型的電晶體時(例如,選擇電晶體selTFT為P型而旁路電晶體bpTFT為N型,或者,選擇電晶體selTFT為N型而旁路電晶體bpTFT為P型),則閘極控制信號GC[n]與放電選擇信號DS[n]的位準維持同向。 If the selected transistor selTFT and the bypass transistor bpTFT are the same type of transistors (for example, the same P-type or the same N-type), the position of the gate control signal GC[n] and the discharge selection signal DS[n] Quasi-maintain the reverse. Or, if the transistor selTFT and the bypass transistor bpTFT are selected as different types of transistors (for example, the transistor selTFT is selected as P type and the bypass transistor bpTFT is selected as N type, or the transistor selTFT is selected as N type and The bypass transistor bpTFT is P-type), the gate control signal GC[n] and the discharge selection signal DS[n] maintain the same direction.
此處假設閘極控制信號GC[n]與放電選擇信號DS[n]由列控制器提供。此外,分支電壓Vbr的變化取決於閘極控制信號GC[n]與放電選擇信號DS[n]的變化對選擇電路與發光電路的影響。關於分支 電壓Vbr如何因應閘極控制信號GC[n]與放電選擇信號DS[n]的改變而變化,將於第5A、5B圖說明。 It is assumed here that the gate control signal GC[n] and the discharge selection signal DS[n] are provided by the column controller. In addition, the change of the branch voltage Vbr depends on the influence of the change of the gate control signal GC[n] and the discharge selection signal DS[n] on the selection circuit and the light-emitting circuit. About branches How the voltage Vbr changes in response to changes in the gate control signal GC[n] and the discharge selection signal DS[n] will be described in Figs. 5A and 5B.
請參見第5A圖,其係子像素電路SP(m,n)被時序控制器選定發光時的電流流向之示意圖。此圖式對應於第4B圖的ta時點至tb時點的期間,故請同時參見第4B圖與第5A圖。由於閘極控制信號GC[n]在ta時點至tb時點的期間為低位準(L)的緣故,選擇電晶體selTFT在ta時點至tb時點的期間將導通。因此,選擇電晶體selTFT的源極將接收到發光二極體電壓VLED導通至分支節點Nbr。也因此,分支電壓Vbr在ta時點至tb時點的期間為高位準(H)。 Please refer to FIG. 5A, which is a schematic diagram of the current flow when the sub-pixel circuit SP(m,n) is selected by the timing controller to emit light. This diagram corresponds to the period from time ta to time tb in Figure 4B, so please refer to Figure 4B and Figure 5A at the same time. Since the gate control signal GC[n] is at a low level (L) from time ta to time tb, the selection transistor selTFT will be turned on from time ta to time tb. Therefore, the source of the selective transistor selTFT will receive the light-emitting diode voltage V LED to conduct to the branch node Nbr. Therefore, the branch voltage Vbr is at a high level (H) from the time point ta to the time point tb.
連帶的,發光二極體LED的陽極因為連接至分支節點Nbr的緣故也為高位準(H)。故發光二極體LED在ta時點至tb時點的期間發光。另一方面,旁路電晶體bpTFT因為閘極接收到高位準(H)的放電選擇信號DS[nc]而維持關閉(斷開)。據此,當子像素電路SP(m,n)被選定並發光時,發光二極體LED可正常的發光,且旁路電晶體bpTFT的設置並不會影響發光二極體LED的發光。 Incidentally, the anode of the light-emitting diode LED is also at a high level (H) because it is connected to the branch node Nbr. Therefore, the light-emitting diode LED emits light during the period from time ta to time tb. On the other hand, the bypass transistor bpTFT remains closed (disconnected) because the gate receives the high-level (H) discharge selection signal DS[nc]. Accordingly, when the sub-pixel circuit SP(m,n) is selected and emits light, the light-emitting diode LED can normally emit light, and the setting of the bypass transistor bpTFT does not affect the light-emitting of the light-emitting diode LED.
請參見第5B圖,其係子像素電路SP(m,n)未被時序控制器選定發光時的電流流向之示意圖。此圖式對應於第4B圖的tb時點過後,故請同時參見第4B圖與第5B圖。 Please refer to FIG. 5B, which is a schematic diagram of the current flow when the sub-pixel circuit SP(m,n) is not selected by the timing controller to emit light. This pattern corresponds to the tb time point in Fig. 4B, so please refer to Fig. 4B and Fig. 5B at the same time.
由於閘極控制信號GC[n]在tb時點過後為高位準(H),選擇電晶體selTFT將斷開。儘管選擇電晶體selTFT斷開,所以分支電壓Vbr無法經由選擇電晶體selTFT接收來自列供應電壓Vdd[n]的發光二極體電壓VLED,但分支電壓Vbr仍將自Cp接收先前在ta時點與tb時點之 間所儲存的電荷。因此,分支電壓Vbr並不會在tb時點立刻降至低位準(L),而是經過一段遞減期間後才降至低位準。 Since the gate control signal GC[n] is at a high level (H) after the tb time point, the selection transistor selTFT will be turned off. Although the selection transistor selTFT is disconnected, the branch voltage Vbr cannot receive the light-emitting diode voltage V LED from the column supply voltage Vdd[n] through the selection transistor selTFT, but the branch voltage Vbr will still receive from Cp at the time point ta and The charge stored between tb time points. Therefore, the branch voltage Vbr does not drop to the low level (L) immediately at the tb time point, but drops to the low level after a period of decreasing.
自tb時點過後,放電選擇信號DS[nc]由高位準(H)切換至低位準(L)。此時,旁路電晶體bpTFT因為閘極接收到低位準(L)的放電選擇信號DS[n]而導通。此時,由寄生電容Cp傳送至分支節點Nbr的電荷將因為旁路電晶體bpTFT導通的緣故,使放電電流id先流經旁路電晶體bpTFT後,再流至資料線S[m]。由於旁路電晶體bpTFT導通的緣故,發光二極體LED兩端的電壓小於其順向電壓(forward voltage,簡稱為Vf)。連帶的,此時並不會有電流流經發光二極體LED。據此,可以確保未被選取的發光二極體LED不會發光。也因此,採用此種像素結構的LED顯示面板並不會產生鬼影的現象。 After the tb time point, the discharge selection signal DS[nc] switches from a high level (H) to a low level (L). At this time, the bypass transistor bpTFT is turned on because the gate receives the low-level (L) discharge selection signal DS[n]. At this time, the charge transferred from the parasitic capacitor Cp to the branch node Nbr will cause the discharge current id to flow through the bypass transistor bpTFT first, and then to the data line S[m] due to the conduction of the bypass transistor bpTFT. Due to the conduction of the bypass transistor bpTFT, the voltage across the light emitting diode LED is less than its forward voltage (Vf). Incidentally, no current will flow through the light-emitting diode LED at this time. Accordingly, it can be ensured that the light-emitting diode LED that is not selected does not emit light. Therefore, the LED display panel adopting this pixel structure does not produce ghost images.
根據本發明的構想,LED顯示面板包含多個如第4A圖所示的子像素電路SP(m,n),並搭配第4B圖波形加以控制。其中,子像素電路內的發光二極體LED可為單色,或為不同的顏色。在彩色LED顯示面板中,像素電路可包含紅色子像素(red subpixel)電路、子像素(green subpixel)電路與藍色子像素(blue subpixel)電路。 According to the concept of the present invention, the LED display panel includes a plurality of sub-pixel circuits SP(m, n) as shown in FIG. 4A, which are controlled with the waveform in FIG. 4B. Among them, the light-emitting diode LED in the sub-pixel circuit can be a single color or different colors. In a color LED display panel, the pixel circuit may include a red subpixel circuit, a green subpixel circuit, and a blue subpixel circuit.
請參見第6A圖,其係彩色的像素電路採用第4A圖之架構的示意圖。在此圖式中,像素電路P(x,n)包含:紅色子像素電路、綠色子像素電路與藍色子像素電路。紅色子像素電路包含紅色選擇電路SCr與紅色發光電路LCr;綠色子像素電路包含綠色選擇電路SCg與綠色發光電路LCg;藍色子像素電路包含藍色選擇電路SCb與藍色發光電路LCb。 Please refer to FIG. 6A, which is a schematic diagram of the color pixel circuit adopting the structure of FIG. 4A. In this figure, the pixel circuit P(x, n) includes: a red sub-pixel circuit, a green sub-pixel circuit, and a blue sub-pixel circuit. The red sub-pixel circuit includes a red selection circuit SCr and a red light-emitting circuit LCr; the green sub-pixel circuit includes a green selection circuit SCg and a green light-emitting circuit LCg; the blue sub-pixel circuit includes a blue selection circuit SCb and a blue light-emitting circuit LCb.
在紅色子像素電路中,紅色選擇電路SCr電連接於列供應電壓Vdd[n]、閘極控制線GCr[n]與分支節點Nbrr。此外,紅色發光 電路LCr電連接於分支節點Nbrr、放電選擇線DSr[n]與資料線Sr[x]。在綠色子像素電路中,綠色選擇電路SCg電連接於列供應電壓Vdd[n]、閘極控制線GCg[n]與分支節點Nbrg。此外,綠色發光電路LCg電連接於分支節點Nbrg、放電選擇線DSg[n]與資料線Sg[x]。在藍色子像素電路中,藍色選擇電路SCb電連接於列供應電壓Vdd[n]、閘極控制線GCb[n]與分支節點Nbrb。此外,藍色發光電路LCb電連接於分支節點Nbrb、放電選擇線DSb[n]與資料線Sb[x]。 In the red sub-pixel circuit, the red selection circuit SCr is electrically connected to the column supply voltage Vdd[n], the gate control line GCr[n] and the branch node Nbrr. In addition, red glow The circuit LCr is electrically connected to the branch node Nbrr, the discharge selection line DSr[n] and the data line Sr[x]. In the green sub-pixel circuit, the green selection circuit SCg is electrically connected to the column supply voltage Vdd[n], the gate control line GCg[n] and the branch node Nbrg. In addition, the green light-emitting circuit LCg is electrically connected to the branch node Nbrg, the discharge selection line DSg[n], and the data line Sg[x]. In the blue sub-pixel circuit, the blue selection circuit SCb is electrically connected to the column supply voltage Vdd[n], the gate control line GCb[n] and the branch node Nbrb. In addition, the blue light-emitting circuit LCb is electrically connected to the branch node Nbrb, the discharge selection line DSb[n], and the data line Sb[x].
由第6A圖可以看出,不同顏色的子像素電路的電路架構均相似,其差異處為子像素電路所包含之發光二極體LED的顏色,以及所對應之閘極控制信號GC[n]和放電選擇信號DS[n]。表1整理第6A圖的子像素電路的比較。 It can be seen from Figure 6A that the circuit architectures of the sub-pixel circuits of different colors are similar. The difference lies in the color of the light-emitting diode LED contained in the sub-pixel circuit and the corresponding gate control signal GC[n] And discharge selection signal DS[n]. Table 1 summarizes the comparison of the sub-pixel circuits in Figure 6A.
請參見第6B圖,其係與第6A圖的像素電路相關之控制信號的波形圖。此圖式的波形由上而下分別為:列供應電壓Vdd[n]、與紅色子像素相連的閘極控制信號GCr[n]、與綠色子像素相連的閘極控制信號GCg[n]、與藍色子像素相連的閘極控制信號]GCb[n]、與紅色子像素相連的放電選擇信號DSr[n]、綠色子像素相連的放電選擇信號DSg[n],以及與藍色子像素相連的放電選擇信號DSb[n]。t1時點至t4時點為,與像素電路P(x,n)對應的像素顯示期間Tp。 Please refer to Fig. 6B, which is a waveform diagram of control signals related to the pixel circuit of Fig. 6A. The waveforms of this figure from top to bottom are: column supply voltage Vdd[n], gate control signal GCr[n] connected to the red sub-pixel, gate control signal GCg[n] connected to the green sub-pixel, The gate control signal]GCb[n] connected to the blue sub-pixel, the discharge selection signal DSr[n] connected to the red sub-pixel, the discharge selection signal DSg[n] connected to the green sub-pixel, and the blue sub-pixel Connected discharge selection signal DSb[n]. The time t1 to the time t4 is the pixel display period Tp corresponding to the pixel circuit P(x, n).
在t1時點至t2時點的期間,閘極控制信號GCr[n]為低位準,且放電選擇信號DSr[n]為高位準。此時,紅色子像素電路的狀態如第5A圖所示。即,發光二極體LEDr發光,而旁路電晶體bpTFTr斷開。另一方面,由於閘極控制信號GCg[n]、GCb[n]為高位準,而放電選擇信號DSg[n]、DS[n]為低位準。在t1時點至t2時點的期間,綠色子像素電路與藍色子像素電路的狀態如第5B圖所示。即,在綠色子像素中,放電電流id將流經旁路電晶體bpTFTg,使發光二極體LEDg兩端的電壓小於其順向電壓Vf;以及,在藍色子像素電路中,放電電流id將流經電晶體bpTFTb,使發光二極體LEDb兩端的電壓小於其順向電壓Vf。因此,由於沒有任何電流流經綠色子像素內的發光二極體LEDg、藍色子像素內的發光二極體LEDb的緣故,發光二極體LEDg、LEDb在t1時點至t2時點的期間並不會發光。此處將t1時點至t2時點的期間定義為,與紅色子像素電路對應的子像素發光期間Tspr。 During the period from time t1 to time t2, the gate control signal GCr[n] is at a low level, and the discharge selection signal DSr[n] is at a high level. At this time, the state of the red sub-pixel circuit is shown in Figure 5A. That is, the light emitting diode LEDr emits light, and the bypass transistor bpTFTr is turned off. On the other hand, since the gate control signals GCg[n] and GCb[n] are at high levels, the discharge selection signals DSg[n] and DS[n] are at low levels. During the period from time t1 to time t2, the states of the green sub-pixel circuit and the blue sub-pixel circuit are as shown in FIG. 5B. That is, in the green sub-pixel, the discharge current id will flow through the bypass transistor bpTFTg, so that the voltage across the light emitting diode LEDg is less than its forward voltage Vf; and, in the blue sub-pixel circuit, the discharge current id will be Flowing through the transistor bpTFTb makes the voltage across the light emitting diode LEDb smaller than its forward voltage Vf. Therefore, since no current flows through the light-emitting diode LEDg in the green sub-pixel and the light-emitting diode LEDb in the blue sub-pixel, the light-emitting diodes LEDg and LEDb do not flow from time t1 to time t2. Will shine. Here, the period from time t1 to time t2 is defined as the sub-pixel light-emitting period Tspr corresponding to the red sub-pixel circuit.
同理,在t2時點至t3時點的期間,綠色子像素電路處於第5A圖的狀態,而紅色子像素電路與藍色子像素電路處於如第5B圖所示的狀態。故,綠色子像素電路內的發光二極體LEDg在t2時點至t3時點的期間發光,而紅色子像素內的發光二極體LEDr和藍色子像素內的發光二極體LEDb在這段期間並不會發光。此處將t2時點至t3時點的期間定義為,與綠色子像素電路對應的子像素發光期間Tspg。 Similarly, during the period from time t2 to time t3, the green sub-pixel circuit is in the state shown in FIG. 5A, and the red sub-pixel circuit and the blue sub-pixel circuit are in the state shown in FIG. 5B. Therefore, the light-emitting diode LEDg in the green sub-pixel circuit emits light during the period from t2 to t3, while the light-emitting diode LEDr in the red sub-pixel and the light-emitting diode LEDb in the blue sub-pixel emit light during this period. It will not shine. Here, the period from time t2 to time t3 is defined as the sub-pixel light-emitting period Tspg corresponding to the green sub-pixel circuit.
在t3時點至t4時點的期間,藍色子像素電路處於第5A圖的狀態,而紅色子像素電路、綠色子像素電路處於第5B圖的狀態。故,藍色子像素電路內的發光二極體LEDb在這段期間發光,而紅色子像素內的發光二極體LEDr和綠色子像素內的發光二極體LEDg並不會在t3 時點至t4時點的期間發光。此處將t3時點至t4時點的期間定義為,與藍色子像素電路對應的子像素發光期間Tspb。 During the period from time t3 to time t4, the blue sub-pixel circuit is in the state of FIG. 5A, and the red sub-pixel circuit and the green sub-pixel circuit are in the state of FIG. 5B. Therefore, the light-emitting diode LEDb in the blue sub-pixel circuit emits light during this period, while the light-emitting diode LEDr in the red sub-pixel and the light-emitting diode LEDg in the green sub-pixel will not emit light at t3. Light is emitted from time point to time t4. Here, the period from time t3 to time t4 is defined as the sub-pixel light-emitting period Tspb corresponding to the blue sub-pixel circuit.
請參見第7A圖,其係將前述實施例的子像素電路組合成為LED顯示面板之示意圖。在此圖式中,假設顯示面板包含排列為兩行與三列的像素電路P(x,n)(x=1~2,n=1~3)。其中,每個像素電路包含三個子像素電路,且其結構與第6A圖相同。關於各個像素內的元件與相關控制線之間的連接方式,此處不再詳述,而以表列方式呈現。 Please refer to FIG. 7A, which is a schematic diagram of combining the sub-pixel circuits of the foregoing embodiments into an LED display panel. In this drawing, it is assumed that the display panel includes pixel circuits P(x, n) (x=1~2, n=1~3) arranged in two rows and three columns. Among them, each pixel circuit includes three sub-pixel circuits, and the structure is the same as that of FIG. 6A. Regarding the connection between the elements in each pixel and the related control lines, it will not be described in detail here, but will be presented in a tabular manner.
請參見表2,其係在第7A圖中,位於第一列的像素電路P(1,1)、P(2,1)所包含的紅色選擇電路SCr、綠色選擇電路SCg、藍色選擇電路SCb與紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb,以及與該些選擇電路和發光電路相關的控制信號的列表。 Please refer to Table 2, which is in Figure 7A, the red selection circuit SCr, the green selection circuit SCg, and the blue selection circuit included in the pixel circuits P(1,1) and P(2,1) in the first column SCb, a red light-emitting circuit LCr, a green light-emitting circuit LCg, a blue light-emitting circuit LCb, and a list of control signals related to these selection circuits and light-emitting circuits.
像素電路P(1,1)、P(2,1)的紅色發光電路LCr均與閘極控制信號GCr[1]和放電選擇信號DSr[1]相關。像素電路P(1,1)、P(2,1)的紅色發光電路LCr的差異處在於,連接至不同的資料線S[1]、S[4]。 其中,像素電路P(1,1)的紅色發光電路LCr經資料線Sr[1]與開關sw[1]而電連接於電流源Isrc[1],且其發光二極體LEDr的亮度由電流源Isrc[1]所提供的資料電流的電流值決定。另一方面,像素電路P(2,1)的紅色發光電路LCr經資料線Sr[2]與開關sw[4]而電連接於電流源Isrc[4],且其發光二極體LEDr的亮度由電流源Isrc[4]所提供的資料電流的電流值決定。 The red light-emitting circuits LCr of the pixel circuits P(1,1) and P(2,1) are all related to the gate control signal GCr[1] and the discharge selection signal DSr[1]. The difference between the red light-emitting circuits LCr of the pixel circuits P(1,1) and P(2,1) is that they are connected to different data lines S[1] and S[4]. Among them, the red light-emitting circuit LCr of the pixel circuit P(1,1) is electrically connected to the current source Isrc[1] via the data line Sr[1] and the switch sw[1], and the brightness of the light-emitting diode LEDr is determined by the current The current value of the data current provided by the source Isrc[1] is determined. On the other hand, the red light-emitting circuit LCr of the pixel circuit P(2,1) is electrically connected to the current source Isrc[4] via the data line Sr[2] and the switch sw[4], and the brightness of the light-emitting diode LEDr Determined by the current value of the data current provided by the current source Isrc[4].
像素電路P(1,1)、P(2,1)的綠色發光電路LCg均與閘極控制信號GCg[1]和放電選擇信號DSg[1]相關,但像素電路P(1,1)、P(2,1)的綠色發光電路LCg連接至不同的資料線S[2]、S[5]。像素電路P(1,1)的綠色發光電路LCg經資料線Sg[1]與開關sw[2]而電連接於電流源Isrc[2],且其發光二極體LEDg的亮度由電流源Isrc[2]所提供的資料電流的電流值決定。另一方面,像素電路P(2,1)的綠色發光電路LCg經資料線Sg[2]與開關sw[5]而電連接於電流源Isrc[5],且其發光二極體LEDg的亮度由電流源Isrc[5]所提供的資料電流的電流值決定。 The green light-emitting circuits LCg of the pixel circuits P(1,1) and P(2,1) are all related to the gate control signal GCg[1] and the discharge selection signal DSg[1], but the pixel circuit P(1,1), The green light-emitting circuit LCg of P(2,1) is connected to different data lines S[2] and S[5]. The green light-emitting circuit LCg of the pixel circuit P(1,1) is electrically connected to the current source Isrc[2] via the data line Sg[1] and the switch sw[2], and the brightness of the light-emitting diode LEDg is determined by the current source Isrc [2] The current value of the data provided is determined by the current value. On the other hand, the green light-emitting circuit LCg of the pixel circuit P(2,1) is electrically connected to the current source Isrc[5] via the data line Sg[2] and the switch sw[5], and the brightness of the light-emitting diode LEDg Determined by the current value of the data current provided by the current source Isrc[5].
像素電路P(1,1)、P(2,1)的藍色發光電路LCb均與閘極控制信號GCb[1]和放電選擇信號DSb[1]相關,但像素電路P(1,1)、P(2,1)的藍色發光電路LCb連接至不同的資料線Sb[1]、Sb[2]。像素電路P(1,1)的藍色發光電路LCb經資料線Sb[1]與開關sw[3]而電連接於電流源Isrc[3],且其發光二極體LEDb的亮度由電流源Isrc[3]所提供的資料電流的電流值決定。另一方面,像素電路P(2,1)的藍色發光電路LCb經資料線Sb[2]與開關sw[6]而電連接於電流源Isrc[6],且其發光二極體LEDb的亮度由電流源Isrc[6]所提供的資料電流的電流值決定。 The blue light-emitting circuits LCb of the pixel circuits P(1,1) and P(2,1) are all related to the gate control signal GCb[1] and the discharge selection signal DSb[1], but the pixel circuit P(1,1) , The blue light-emitting circuit LCb of P(2,1) is connected to different data lines Sb[1] and Sb[2]. The blue light-emitting circuit LCb of the pixel circuit P(1,1) is electrically connected to the current source Isrc[3] via the data line Sb[1] and the switch sw[3], and the brightness of the light-emitting diode LEDb is determined by the current source The current value of the data current provided by Isrc[3] is determined. On the other hand, the blue light-emitting circuit LCb of the pixel circuit P(2,1) is electrically connected to the current source Isrc[6] via the data line Sb[2] and the switch sw[6], and the light-emitting diode LEDb The brightness is determined by the current value of the data current provided by the current source Isrc[6].
關於第7A圖中,位於第二列的像素電路P(1,2)、P(2,2),以及第三列的像素電路P(1,3)、P(3,3)所包含的紅色選擇電路 SCr、綠色選擇電路SCg、藍色選擇電路SCb與紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb的相關細節,亦可類推前述說明得出。此處僅以表列方式呈現而不再詳述。 Regarding Figure 7A, the pixel circuits P(1,2) and P(2,2) in the second column and the pixel circuits P(1,3) and P(3,3) in the third column are included Red selection circuit The related details of SCr, the green selection circuit SCg, the blue selection circuit SCb, the red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb can also be derived by analogy with the foregoing description. Here is only presented in a tabular manner and will not be described in detail.
由第7A圖可以看出,位於同一行的發光電路經由相同的資料信號S[m]連接至對應的電流源。例如,像素電路P(1,1)、P(1,2)、P(1,3)的紅色發光電路LCr均位於第一行,且同時電連接於資料線S[1]。當行致能信號Senr[1]為高位準(H)時,開關sw[1]導通。此時,根據閘極控制信號GCr[1]、GCr[2]、GCr[3]的電壓位準,決定是像素 電路P(1,1)、P(1,2)、像素電路P(1,3)中何者的紅色發光電路LCr將發光。其中,被選定發光的紅色發光電路LCr,其亮度將由電流源Isrc[1]所提供的資料電流的電流值決定。 It can be seen from Figure 7A that the light-emitting circuits located in the same row are connected to the corresponding current source via the same data signal S[m]. For example, the red light-emitting circuits LCr of the pixel circuits P(1,1), P(1,2), and P(1,3) are all located in the first row, and are electrically connected to the data line S[1] at the same time. When the line enable signal Senr[1] is at a high level (H), the switch sw[1] is turned on. At this time, according to the voltage levels of the gate control signals GCr[1], GCr[2], GCr[3], it is determined to be the pixel Which of the circuits P(1,1), P(1,2), or the pixel circuit P(1,3), the red light-emitting circuit LCr will emit light. Among them, the brightness of the red light-emitting circuit LCr selected to emit light will be determined by the current value of the data current provided by the current source Isrc[1].
例如,若閘極控制信號GCr[1]為低位準(L),且閘極控制信號GCr[2]、GCr[3]均為高位準(H)時,像素電路P(1,1)的紅色發光電路LCr將發光。或者,若閘極控制信號GCr[2]為低位準(L),且閘極控制信號GCr[1]、GCr[3]均為高位準(H)時,像素電路P(1,2)的紅色發光電路LCr將發光。又如,若閘極控制信號GCr[3]為低位準(L),且閘極控制信號GCr[1]、GCr[2]均為高位準(H)時,像素電路P(1,3)的紅色發光電路LCr將發光。 For example, if the gate control signal GCr[1] is at a low level (L), and the gate control signals GCr[2] and GCr[3] are both at a high level (H), the pixel circuit P(1,1) The red light-emitting circuit LCr will emit light. Or, if the gate control signal GCr[2] is at a low level (L), and the gate control signals GCr[1] and GCr[3] are both at a high level (H), the pixel circuit P(1,2) The red light-emitting circuit LCr will emit light. For another example, if the gate control signal GCr[3] is at a low level (L), and the gate control signals GCr[1] and GCr[2] are both at a high level (H), the pixel circuit P(1,3) The red light-emitting circuit LCr will emit light.
關於如何利用行致能信號Seng[1]搭配閘極控制信號GCg[1]、GCg[2]、GCg[3]選取像素電路P(1,1)、P(1,2)、P(1,3)的綠色發光電路LCg並加以控制;如何利用行致能信號Senb[1]搭配閘極控制信號GCb[1]、GCb[2]、GCb[3]選取像素電路P(1,1)、P(1,2)、P(1,3)的藍色發光電路LCb並加以控制;如何利用行致能信號Senr[2]搭配閘極控制信號GCr[1]、GCr[2]、GCr[3]選取像素電路P(2,1)、P(2,2)、P(2,3)的紅色發光電路LCr並加以控制;如何利用行致能信號Seng[2]搭配閘極控制信號GCg[1]、GCg[2]、GCg[3]選取像素電路P(2,1)、P(2,2)、P(2,3)的綠色發光電路LCg並加以控制;如何利用行致能信號Senb[2]搭配閘極控制信號GCb[1]、GCb[2]、GCb[3]選取像素電路P(2,1)、P(2,2)、P(2,3)的藍色發光電路LCb並加以控制等細節,因與像素電路P(1,1)、P(1,2)、P(1,3)的紅色發光電路LCr的選取與控制方式相似,此處不予詳述。 On how to use the line enable signal Seng[1] with the gate control signals GCg[1], GCg[2], GCg[3] to select the pixel circuits P(1,1), P(1,2), P(1) ,3) and control the green light-emitting circuit LCg; how to use the line enable signal Senb[1] with the gate control signal GCb[1], GCb[2], GCb[3] to select the pixel circuit P(1,1) , P(1,2), P(1,3) blue light-emitting circuit LCb and control it; how to use line enable signal Senr[2] with gate control signal GCr[1], GCr[2], GCr [3] Select and control the red light-emitting circuit LCr of pixel circuits P(2,1), P(2,2), P(2,3); how to use line enable signal Seng[2] with gate control signal GCg[1], GCg[2], GCg[3] select and control the green light-emitting circuit LCg of the pixel circuit P(2,1), P(2,2), P(2,3); how to use the behavior Can signal Senb[2] with gate control signals GCb[1], GCb[2], GCb[3] to select the blue of the pixel circuits P(2,1), P(2,2), P(2,3) The color light-emitting circuit LCb and control details are similar to the selection and control method of the red light-emitting circuit LCr of the pixel circuits P(1,1), P(1,2), P(1,3). Detailed.
請參見第7B圖,其係與第7A圖的像素電路相關之控制信號的波形圖。請同時參看第7A圖與第7B圖。第7B圖的橫軸為時間。 Please refer to Fig. 7B, which is a waveform diagram of the control signals related to the pixel circuit of Fig. 7A. Please refer to Figure 7A and Figure 7B at the same time. The horizontal axis of Figure 7B is time.
t1時點至t4時點對應於第一列的像素電路P(1,1)、P(2,1)的列發光期間Tr[1]。即,在t1時點至t4時點的期間,位於第二列的像素電路P(1,2)、P(2,2)以及位於第三列的像素電路P(1,3)、P(2,3)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb均處於如第5B圖的狀態而不會發光。另,t1時點至t4時點的期間進一步分為三個子像素發光期間Tspr、Tspg、Tspb。與紅色發光電路LCr對應的子像素發光期間Tspr介於t1時點與t2時點之間;與綠色發光電路LCg對應的子像素發光期間Tspg介於t2時點與t3時點之間;且,與藍色發光電路LCb對應的子像素發光期間Tspb介於t3時點與t4時點之間。 The time t1 to the time t4 corresponds to the column light emitting period Tr[1] of the pixel circuits P(1,1) and P(2,1) of the first column. That is, during the period from time t1 to time t4, the pixel circuits P(1,2), P(2,2) located in the second column and the pixel circuits P(1,3), P(2, 2) located in the third column 3) The red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb are all in the state shown in FIG. 5B and do not emit light. In addition, the period from time t1 to time t4 is further divided into three sub-pixel light emitting periods Tspr, Tspg, and Tspb. The sub-pixel light-emitting period Tspr corresponding to the red light-emitting circuit LCr is between t1 and t2; the sub-pixel light-emitting period Tspg corresponding to the green light-emitting circuit LCg is between t2 and t3; and, with blue light emission The light-emitting period Tspb of the sub-pixel corresponding to the circuit LCb is between the time t3 and the time t4.
由於行致能信號Sen[1]、Sen[2]同樣在t1時點至t2時點為高位準,像素電路P(1,1)、P(2,1)的紅色發光電路LCr可同時於這段期間發光。即,位於同一列且具有相同顏色的發光電路可同時發光。其中,行致能信號Senr[1]、Senr[2]將分別使開關sw[1]、sw[4]導通。開關sw[1]的導通使資料線Sr[1]電連接於電流源Isrc[1],而開關sw[4]的導通使資料線Sr[2]電連接於電流源Isrc[4]。因此,在t1時點至t2時點的期間,像素電路P(1,1)、P(2,1)的紅色發光電路LCr中的發光二極體LED的亮度,將分別由電流源Isrc[1]、Isrc[4]所提供的資料電流的電流值決定。 Since the line enable signals Sen[1] and Sen[2] are also at high levels from t1 to t2, the red light-emitting circuits LCr of the pixel circuits P(1,1) and P(2,1) can be in this segment at the same time Glow during the period. That is, the light-emitting circuits that are located in the same column and have the same color can emit light at the same time. Among them, the line enable signals Senr[1] and Senr[2] will respectively turn on the switches sw[1] and sw[4]. The conduction of the switch sw[1] electrically connects the data line Sr[1] to the current source Isrc[1], and the conduction of the switch sw[4] electrically connects the data line Sr[2] to the current source Isrc[4]. Therefore, during the period from t1 to t2, the brightness of the light-emitting diode LED in the red light-emitting circuit LCr of the pixel circuits P(1,1) and P(2,1) will be determined by the current source Isrc[1] , The current value of the data current provided by Isrc[4] is determined.
在t1時點至t2時點的像素發光期間Tspr,除閘極控制信號GCr[1]外的閘極控制信號GCg[1]、GCb[1]、GCr[2]、 GCg[2]、GCb[2]、GCr[3]、GCg[3]、GCb[2]均為高位準(H);且除放電選擇信號DSr[1]外的放電選擇信號DSg[1]、DSb[1]、DSr[2]、DSg[2]、DSb[2]、DSr[3]、DSg[3]、DS3[2]均為低位準(L)。據此,可確保僅有像素電路P(1,1)、P(2,1)的紅色發光電路LCr會在t1時點至t2時點的像素發光期間Tspr發光。一即,在t1時點至t2時點的像素發光期間Tspr,像素電路P(1,1)、P(2,1)的綠色發光電路LCg、藍色發光電路LCb,以及像素電路P(1,2)、P(2,2)、P(1,3)、P(3,3)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb內的電流僅留經旁路電晶體bpTFT,並無電流流經該些發光電路內的發光二極體。 During the pixel light-emitting period Tspr from t1 to t2, the gate control signals GCg[1], GCb[1], GCr[2], except for the gate control signal GCr[1] GCg[2], GCb[2], GCr[3], GCg[3], GCb[2] are all high level (H); and the discharge selection signal DSg[1] except for the discharge selection signal DSr[1] , DSb[1], DSr[2], DSg[2], DSb[2], DSr[3], DSg[3], DS3[2] are all low level (L). Accordingly, it can be ensured that only the red light-emitting circuit LCr of the pixel circuits P(1,1) and P(2,1) will emit light during the pixel light-emitting period Tspr from time t1 to time t2. First, in the pixel light-emitting period Tspr from t1 to t2, the green light-emitting circuit LCg, blue light-emitting circuit LCb of the pixel circuit P(1,1), P(2,1), and the pixel circuit P(1,2 ), P(2,2), P(1,3), P(3,3), the current in the red light-emitting circuit LCr, green light-emitting circuit LCg, and blue light-emitting circuit LCb is only left through the bypass transistor bpTFT, No current flows through the light-emitting diodes in these light-emitting circuits.
同理,在t2時點至t3時點的像素發光期間Tspg,僅有像素電路P(1,1)、P(2,1)的綠色發光電路LCg發光;以及,在t3時點至t4時點的像素發光期間Tspb,僅有像素電路P(1,1)、P(2,1)的藍色發光電路LCb發光。因此,可以確保在各個子像素發光期間Tspr、Tspg、Tspg均僅有被選定的發光電路會發光,達到消除鬼影現象的效果。關於第7A圖的其他各個像素電路與第7B圖的其餘發光期間的說明,因與前述說明類似,此處不再詳述。 Similarly, during the pixel light-emitting period Tspg from t2 to t3, only the green light-emitting circuits LCg of the pixel circuits P(1,1) and P(2,1) emit light; and the pixels from t3 to t4 emit light During the period Tspb, only the blue light-emitting circuit LCb of the pixel circuits P(1,1) and P(2,1) emit light. Therefore, it can be ensured that only the selected light-emitting circuit will emit light during the light-emitting period of each sub-pixel Tspr, Tspg, and Tspg, so as to achieve the effect of eliminating the ghost phenomenon. The description of the other pixel circuits in FIG. 7A and the rest of the light-emitting period in FIG. 7B are similar to the foregoing description, and will not be described in detail here.
請參見第8圖,其係基於第6圖所示的LED顯示面板,進一步搭配解多工器(demultiplexer)控制之示意圖。第8圖的顯示面板的架構與第6圖相似,兩者的差異在於,在行控制器中的電流源的個數與開關的個數。在此圖式中,同一行的像素電路均連接於同一個開關sw與電流源Isrc。即,對同樣位於第一行的像素電路P(1,1)、P(1,2)、P(3,1)而言,其紅色發光電路LCr經由資料線Sr[1]連接至開關swG1、綠色發光電路LCg經由資料 線Sg[1]連接至開關swG1、藍色發光電路LCb經由資料線Sb[1]連接至開關swG1;且,對同樣位於第二行的像素電路P(2,1)、P(2,2)、P(2,1)而言,其紅色發光電路LCr經由資料線Sr[2]連接至開關swG2、綠色發光電路LCg經由資料線Sg[2]連接至開關swG2、藍色發光電路LCb經由資料線Sb[2]連接至開關swG2。其中,開關swG1由行致能信號SenG1控制,而開關swG2由行致能信號SenG2控制。開關swG1因高位準(H)的行致能信號SenG1而導通時,資料線Sr[1]、Sg[1]、Sb[1]將同時電連接於電流源IsrcG1;以及,開關swG2因高位準(H)的行致能信號SenG2而導通時,資料線Sr[2]、Sg[2]、Sb[2]將同時電連接於電流源IsrcG1。 Please refer to Fig. 8, which is based on the LED display panel shown in Fig. 6, and is further controlled by a demultiplexer. The structure of the display panel in Fig. 8 is similar to that in Fig. 6. The difference between the two is the number of current sources and the number of switches in the row controller. In this figure, the pixel circuits in the same row are all connected to the same switch sw and current source Isrc. That is, for the pixel circuits P(1,1), P(1,2), P(3,1) also located in the first row, the red light-emitting circuit LCr is connected to the switch swG1 via the data line Sr[1] , Green light-emitting circuit LCg through the data The line Sg[1] is connected to the switch swG1, and the blue light-emitting circuit LCb is connected to the switch swG1 via the data line Sb[1]; ), P(2,1), the red light-emitting circuit LCr is connected to the switch swG2 via the data line Sr[2], the green light-emitting circuit LCg is connected to the switch swG2 via the data line Sg[2], and the blue light-emitting circuit LCb is connected via The data line Sb[2] is connected to the switch swG2. Among them, the switch swG1 is controlled by the horizontal enable signal SenG1, and the switch swG2 is controlled by the horizontal enable signal SenG2. When the switch swG1 is turned on due to the high-level (H) line enable signal SenG1, the data lines Sr[1], Sg[1], and Sb[1] will be electrically connected to the current source IsrcG1 at the same time; and, the switch swG2 will be electrically connected to the current source IsrcG1 at the same time. When the line enable signal SenG2 of (H) is turned on, the data lines Sr[2], Sg[2], and Sb[2] will be electrically connected to the current source IsrcG1 at the same time.
請參見第9圖,其係控制第8圖所示之LED顯示面板的波形圖。請同時參看第8圖與第9圖。在第9圖中,由上而下的波形分別為:列供應電壓Vdd[1]、Vdd[2]、Vdd[3];用於控制位於第一列的像素電路P(1,1)、P(2,1)的紅色選擇電路SC r、綠色選擇電路SCg、藍色選擇電路SCb的閘極控制信號GCr[1]、GCg[1]、GCb[1];用於控制位於第二列的像素電路P(1,2)、P(2,2)的紅色選擇電路SCr、綠色選擇電路SCg、藍色選擇電路SCb的閘極控制信號GCr[2]、GCg[2]、GCb[2];用於控制位於第三列的像素電路P(1,3)、P(2,3)的紅色選擇電路SCr、綠色選擇電路SCg、藍色選擇電路SCb的閘極控制信號GCr[3]、GCg[3]、GCb[3];用於控制位於第一列的像素電路P(1,1)、P(2,1)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb的放電選擇信號DSr[1]、DSg[1]、DSb[1];用於控制位於第二列的像素電路P(1,2)、P(2,2)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb的放電選擇信號DSr[2]、DSg[2]、DSb[2];用於控制位 於第三列的像素電路P(1,3)、P(2,3)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb的放電選擇信號DSr[3]、DSg[3]、DSb[3];與位於第一行的像素電路相連的開關swG1的行致能信號SenG1;以及,與位於第二行的像素電路相連的開關swG2的行致能信號SenG2。 Please refer to Figure 9, which is a waveform diagram for controlling the LED display panel shown in Figure 8. Please refer to Figure 8 and Figure 9 at the same time. In Figure 9, the top-down waveforms are: column supply voltage Vdd[1], Vdd[2], Vdd[3]; used to control the pixel circuit P(1,1), The gate control signals GCr[1], GCg[1], GCb[1] of the red selection circuit SCr, the green selection circuit SCg, and the blue selection circuit SCb of P(2,1); used to control the second column The gate control signals GCr[2], GCg[2], GCb[2] of the pixel circuit P(1,2), P(2,2) of the red selection circuit SCr, the green selection circuit SCg, and the blue selection circuit SCb ]; Used to control the gate control signal GCr of the red selection circuit SCr, the green selection circuit SCg, and the blue selection circuit SCb of the pixel circuits P(1,3) and P(2,3) located in the third column[3] , GCg[3], GCb[3]; used to control the red light-emitting circuit LCr, green light-emitting circuit LCg, and blue light-emitting circuit LCb of the pixel circuits P(1,1) and P(2,1) located in the first column The discharge selection signals DSr[1], DSg[1], DSb[1]; used to control the red light-emitting circuit LCr and green light-emitting of the pixel circuits P(1,2) and P(2,2) located in the second column The discharge selection signals DSr[2], DSg[2], DSb[2] of the circuit LCg and the blue light-emitting circuit LCb; used to control the bit The discharge selection signals DSr[3], DSg[3], the red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb of the pixel circuits P(1,3) and P(2,3) in the third column DSb[3]; the row enable signal SenG1 of the switch swG1 connected to the pixel circuit located in the first row; and the row enable signal SenG2 of the switch swG2 connected to the pixel circuit located in the second row.
第9圖的橫軸為時間,其中並標示t1時點至t10時點。由於第6圖與第8圖的架構相似,故在第9圖與第7圖中,有部分的波形相似。例如:列供應電壓Vdd[1]、Vdd[2]、Vdd[3];與第一列的紅色選擇電路SCr、綠色選擇電路SCg、藍色選擇電路SCb分別相連的閘極控制線GCr[1]、GCg[1]、GCb[1];與第二列的紅色選擇電路SCr、綠色選擇電路SCg、藍色選擇電路SCb分別相連的閘極控制線GCr[2]、GCg[2]、GCb[2];與第三列的選擇電路紅色SCr、綠色選擇電路SCg、藍色選擇電路SCb分別相連的閘極控制線GCr[3]、GCg[3]、GCb[3];與第一列的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別相連的放電選擇線DSr[1]、DSg[1]、DSb[1];與第二列的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別相連放電選擇線DSr[2]、DSg[2]、DSb[2];與第三列的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別相連的放電選擇線DSr[3]、DSg[3]、DSb[3]的變化方式均相似。 The horizontal axis in Figure 9 is time, and t1 to t10 are also marked. Since the architectures in Figure 6 and Figure 8 are similar, there are some similar waveforms in Figures 9 and 7. For example: column supply voltages Vdd[1], Vdd[2], Vdd[3]; gate control lines GCr[1 respectively connected to the red selection circuit SCr, green selection circuit SCg, and blue selection circuit SCb of the first column ], GCg[1], GCb[1]; the gate control lines GCr[2], GCg[2], GCb respectively connected to the red selection circuit SCr, the green selection circuit SCg, and the blue selection circuit SCb in the second column [2]; The gate control lines GCr[3], GCg[3], GCb[3] connected to the selection circuit red SCr, green selection circuit SCg, and blue selection circuit SCb of the third column respectively; and the first column The discharge selection lines DSr[1], DSg[1], DSb[1] connected to the red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb respectively; and the red light-emitting circuit LCr and the green light-emitting circuit in the second column LCg and blue light-emitting circuit LCb are respectively connected to discharge selection lines DSr[2], DSg[2], DSb[2]; respectively connected to the red light-emitting circuit LCr, green light-emitting circuit LCg, and blue light-emitting circuit LCb in the third column The change modes of the discharge selection lines DSr[3], DSg[3], DSb[3] are all similar.
另一方面,第9圖與第7圖所示之波形的差異處為,行致能信號SenG1、SenG2的波形。在第7圖中,各行的子像素彼此獨立,因此使用六個彼此平行的行致能信號Senr[1]、Seng[1]、Senb[1]、Senr[2]、Seng[2]、Senb[2]。在第9圖中,每一個行致能信號SenG同時對應於分屬三行的子像素。 On the other hand, the difference between the waveforms shown in Fig. 9 and Fig. 7 is the waveforms of the line enable signals SenG1 and SenG2. In Figure 7, the sub-pixels of each row are independent of each other, so six parallel row enable signals Senr[1], Seng[1], Senb[1], Senr[2], Seng[2], Senb are used. [2]. In Figure 9, each row enable signal SenG corresponds to the sub-pixels belonging to three rows at the same time.
行致能信號SenG1在t1時點t2時點的期間為高位準(H),使得資料電流由列供應電壓Vdd[1]流出後,先陸續流經像素電路P(1,1)的紅色選擇電路SCr與紅色發光電路LCr後,再經由資料線Sr[1]與開關swG1流至電流源IsrcG1。行致能信號SenG1在t2時點至t3時點的期間為高位準(H),使資料電流由列供應電壓Vdd[1]流出後,先陸續流經像素電路P(1,1)的紅色選擇電路SCr與紅色發光電路LCr後,再經由資料線Sg[1]與開關swG1流至電流源IsrcG1。行致能信號SenG1在t3時點至t4時點的期間為高位準(H),使資料電流由列供應電壓Vdd[1]流出後,先陸續流經像素電路P(1,1)的藍色選擇電路SCb與藍色發光電路LCb後,再經由資料線Sb[1]與開關swG1流至電流源IsrcG1。 The row enable signal SenG1 is at a high level (H) at time t1 and t2, so that the data current flows from the column supply voltage Vdd[1] and then flows through the red selection circuit SCr of the pixel circuit P(1,1). After connecting with the red light-emitting circuit LCr, it flows to the current source IsrcG1 through the data line Sr[1] and the switch swG1. The row enable signal SenG1 is at a high level (H) from t2 to t3, so that the data current flows from the column supply voltage Vdd[1] and then flows through the red selection circuit of the pixel circuit P(1,1). After SCr and the red light-emitting circuit LCr, they then flow to the current source IsrcG1 via the data line Sg[1] and the switch swG1. The row enable signal SenG1 is at a high level (H) from t3 to t4, so that the data current flows from the column supply voltage Vdd[1] and then flows through the blue selection of the pixel circuit P(1,1). After the circuit SCb and the blue light-emitting circuit LCb, they flow to the current source IsrcG1 via the data line Sb[1] and the switch swG1.
行致能信號SenG2在t1時點t2時點的期間為高位準(H),使得資料電流由列供應電壓Vdd[1]流出後,先陸續流經像素電路P(2,1)的紅色選擇電路SCr與紅色發光電路LCr後,再經由資料線Sr[2]與開關swG2流至電流源IsrcG2。行致能信號SenG2在t2時點至t3時點的期間為高位準(H),使得資料電流由列供應電壓Vdd[2]流出後,先陸續流經像素電路P(2,1)的紅色選擇電路SCr與紅色發光電路LCr後,再經由資料線Sg[2]與開關swG1流至電流源IsrcG2。行致能信號SenG2在t3時點至t4時點的期間為高位準(H),使得資料電流由列供應電壓Vdd[1]流出後,先陸續流經像素電路P(2,1)的藍色選擇電路SCb與藍色發光電路LCb後,再經由資料線Sb[2]與開關swG2流至電流源IsrcG2。 The row enable signal SenG2 is at a high level (H) at time t1 and t2, so that the data current flows from the column supply voltage Vdd[1] and then flows through the red selection circuit SCr of the pixel circuit P(2,1). After connecting with the red light-emitting circuit LCr, it then flows to the current source IsrcG2 through the data line Sr[2] and the switch swG2. The row enable signal SenG2 is at a high level (H) from t2 to t3, so that the data current flows from the column supply voltage Vdd[2], and then flows through the red selection circuit of the pixel circuit P(2,1). After SCr and the red light-emitting circuit LCr, they flow to the current source IsrcG2 via the data line Sg[2] and the switch swG1. The row enable signal SenG2 is at a high level (H) from t3 to t4, so that after the data current flows from the column supply voltage Vdd[1], it first flows through the blue selection of the pixel circuit P(2,1) After the circuit SCb and the blue light-emitting circuit LCb, they flow to the current source IsrcG2 via the data line Sb[2] and the switch swG2.
承上所述,行致能信號SenG1、SenG2在t1時點至t4時點的期間均維持在高位準(H)。其中,行致能信號SenG1用於使像素電路P(1,1)的發光元件LCr在t1時點至t2時點的期間根據電流源IsrcG1提 供的資料電流而發光;使像素電路P(1,1)的綠色發光電路LCg在t2時點至t3時點的期間根據電流源IsrcG1提供的資料電流而發光;以及,使像素電路P(1,1)的藍色發光電路LCb在t3時點至t4時點的期間根據電流源IsrcG1提供的資料電流而發光。且,行致能信號SenG2用於使像素電路P(2,1)的發光元件LCr在t1時點至t2時點的期間根據電流源IsrcG2提供的資料電流而發光;使像素電路P(2,1)的綠色發光電路LCg在t2時點至t3時點的期間根據電流源IsrcG2提供的資料電流而發光;以及,使像素電路P(2,1)的藍色發光電路LCb在t3時點至t4時點的期間根據電流源IsrcG2提供的資料電流而發光。 As mentioned above, the horizontal enable signals SenG1 and SenG2 are maintained at the high level (H) from the time t1 to the time t4. Among them, the line enable signal SenG1 is used to enable the light-emitting element LCr of the pixel circuit P(1,1) to be raised according to the current source IsrcG1 during the period from t1 to t2. The green light-emitting circuit LCg of the pixel circuit P(1,1) emits light according to the data current provided by the current source IsrcG1 during the period from t2 to t3; and, the pixel circuit P(1,1) The blue light-emitting circuit LCb of) emits light according to the data current provided by the current source IsrcG1 during the period from time t3 to time t4. In addition, the line enable signal SenG2 is used to make the light-emitting element LCr of the pixel circuit P(2,1) emit light according to the data current provided by the current source IsrcG2 during the period from time t1 to time t2; to make the pixel circuit P(2,1) The green light-emitting circuit LCg emits light according to the data current provided by the current source IsrcG2 during the period from t2 to t3; and the blue light-emitting circuit LCb of the pixel circuit P(2,1) is made to emit light during the period from t3 to t4 The current source IsrcG2 provides the data current and emits light.
同理,行致能信號SenG1、SenG2在t4時點至t7時點的列發光期間Tr[2]亦須維持在高位準(H)。行致能信號SenG1在列發光期間Tr[2]維持在高位準(H),可使像素電路P(1,2)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別在t4時點至t5時點、t5時點至t6時點、t6時點至t7時點的期間與電流源IsrcG1導通;行致能信號SenG2在列發光期間Tr[3]維持在高位準(H),可使像素電路P(2,2)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別在t4時點至t5時點、t5時點至t6時點、t6時點至t7時點的期間與電流源IsrcG2導通。 Similarly, the row enable signals SenG1 and SenG2 must be maintained at the high level (H) during the column light-emitting period Tr[2] from t4 to t7. The row enable signal SenG1 is maintained at a high level (H) during the column light-emitting period Tr[2], so that the red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb of the pixel circuit P(1,2) are respectively at t4 From time to t5, from t5 to t6, and from t6 to t7, the current source IsrcG1 is turned on; the row enable signal SenG2 is maintained at a high level (H) during the column light-emitting period Tr[3], which enables the pixel circuit P The red light-emitting circuit LCr, green light-emitting circuit LCg, and blue light-emitting circuit LCb of (2, 2) are respectively conducted with the current source IsrcG2 during the periods from t4 to t5, t5 to t6, and t6 to t7.
此外,行致能信號SenG1、SenG2在t7時點t10時點的列發光期間Tr[3]亦須維持在高位準(H)。行致能信號SenG1在列發光期間Tr[3]維持在高位準,可使像素電路P(1,3)的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別在t7時點至t8時點、t8時點至t9時點、t9時點至t10時點的期間與電流源IsrcG1導通;行致能信號SenG2在列發光期間Tr[3]維持在高位準(H),可使像素電路P(2,3)的 紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb分別在t7時點至t8時點、t8時點至t9時點、t9時點至t10時點的期間與電流源IsrcG2導通。 In addition, the row enable signals SenG1 and SenG2 must also be maintained at a high level (H) during the column light-emitting period Tr[3] at time t7 and t10. The row enable signal SenG1 is maintained at a high level during the column light-emitting period Tr[3], so that the red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb of the pixel circuit P(1,3) can be respectively from t7 to t8 At time, from t8 to t9, and from t9 to t10, the current source IsrcG1 is turned on; the row enable signal SenG2 is maintained at the high level (H) during the column light-emitting period Tr[3], so that the pixel circuit P(2, 3) The red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb are respectively conducted with the current source IsrcG2 during the periods from t7 to t8, t8 to t9, and t9 to t10.
根據前述說明可以得知,在第9圖中,行致能信號SenG1、SenG2在t1時點至t10時點的期間均需維持在高位準(H)。這是因為在第8圖中,開關swG1同時與資料線Sr[1]、Sg[1]、Sb[1]相連,而開關swG2同時與資料線Sr[2]、Sg[2]、Sb[2]相連的緣故。 According to the foregoing description, in Figure 9, the line enable signals SenG1 and SenG2 need to be maintained at a high level (H) from time t1 to time t10. This is because in Figure 8, the switch swG1 is connected to the data lines Sr[1], Sg[1], Sb[1] at the same time, and the switch swG2 is connected to the data lines Sr[2], Sg[2], Sb[ 2] Connected sake.
請參見第10A、10B圖,其係將本案的LED顯示面板搭配微驅動電路使用之示意圖。由於本案可使用薄膜電晶體作為選擇電晶體selTFT與旁路電晶體bpTFT,因此,採用本案設計的LED顯示面板可搭配陣列基板行驅動技術(Gate driver on array,簡稱為GOA)與微驅動電路的架構使用。在第10A圖中,假設行控制器為微驅動電路21,而列控制器採用GOA 22。
Please refer to Figures 10A and 10B, which are schematic diagrams of using the LED display panel in this case with a micro-drive circuit. Since thin film transistors can be used as the selective transistor selTFT and bypass transistor bpTFT in this case, the LED display panel designed in this case can be used with the gate driver on array (GOA) and micro-drive circuit. Architecture use. In Figure 10A, it is assumed that the row controller is the micro-drive circuit 21, and the column controller uses the
在第10B圖中,假設顯示裝置包含多個顯示面板31。每個顯示面板31包含TFT陣列33、LED陣列35、微驅動電路37與內部的GOA39。另,顯示裝置另提供一外部的GOA 32,由多個顯示面板31共用。由第10B圖可以看出,採用本架構的LED顯示面板可以進一步以模組化的方式排列為陣列。因此,此種架構相當適合用於控制中型、大型的LED顯示面板。
In FIG. 10B, it is assumed that the display device includes a plurality of
請參見第11圖,其係依照本揭露的另一種LED顯示面板的實施例之示意圖。在此圖式中,顯示面板的架構大致類似第6圖。兩者的差異在於,在第6圖中,每個子像素SP(m,n)均包含一個選 擇電路電SC與一個發光電路LC。另一方面,在第11圖中,位於同一列的子像素共用同一個選擇電路SC[n](n=1,2,3)。據此,在第11圖中,位於同一列的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb將共用同一個與列供應電壓Vdd[n](n=1,2,3)相連的選擇電晶體selTFT。為簡化說明,此處以表格方式彙整第11圖各列的元件,以及與該些元件相關的控制信號。 Please refer to FIG. 11, which is a schematic diagram of another embodiment of an LED display panel according to the present disclosure. In this figure, the structure of the display panel is roughly similar to that of Fig. 6. The difference between the two is that, in Figure 6, each sub-pixel SP (m, n) contains a selection Selection circuit SC and a light-emitting circuit LC. On the other hand, in Fig. 11, the sub-pixels located in the same column share the same selection circuit SC[n] (n=1, 2, 3). Accordingly, in Figure 11, the red light-emitting circuit LCr, green light-emitting circuit LCg, and blue light-emitting circuit LCb located in the same column will share the same one and be connected to the column supply voltage Vdd[n](n=1,2,3) The choice of transistor selTFT. To simplify the description, the components in each column of Figure 11 and the control signals related to these components are summarized in a table.
請參見表4,其係在第11圖中,位於第一列的像素電路P(1,1)、P(2,1)所包含的內部元件,以及與該些內部元件相關的控制信號的列表。 Please refer to Table 4, which is in Figure 11, the internal components included in the pixel circuits P(1,1) and P(2,1) in the first column, and the control signals related to these internal components List.
請參見表5,其係在第11圖中,位於第二列的像素電路P(1,1)、P(2,2)所包含的內部元件,以及與該些內部元件相關的控制信號的列表。 Please refer to Table 5, which is in Figure 11, the internal components included in the pixel circuits P(1,1) and P(2,2) in the second column, and the control signals related to these internal components List.
請參見表6,其係在第11圖中,位於第三列的像素電路P(1,3)、P(2,3)所包含的內部元件,以及與該些內部元件相關的控制信號的列表。 Please refer to Table 6, which is in Figure 11, the internal components included in the pixel circuits P(1,3) and P(2,3) in the third column and the control signals related to these internal components List.
為便於說明,本文將第11圖的像素分為兩類,第一類為連接至列供應電壓Vdd[n]的像素電路(例如,像素電路P(1,1)、P(1,2)、P(1,3)),第二類為未連接至列供應電壓Vdd[n]的像素電路(例如,像素電路P(2,1)、P(2,2)、P(2,3))。另請留意,實際應用時,並不需要限定必須是在第一行的像素方連接至列供應電壓Vdd[n]。亦即,可任選其中一行的像素電路(例如,選擇x=5)連接至列供應電壓Vdd[n];或 者,將列供應電壓Vdd[n]連接至在不同列中不同行的像素電路(例如,在第一列選擇x=7、在第二列選擇x=3的像素電路)。總之,在同一列的多個像素電路中,需有一個像素電路連接於列供應電壓Vdd[n],其餘的像素電路則不須連接至列供應電壓Vdd[n]。 For ease of description, this article divides the pixels in Figure 11 into two categories. The first category is the pixel circuits connected to the column supply voltage Vdd[n] (for example, pixel circuits P(1,1), P(1,2)). , P(1,3)), the second category is pixel circuits that are not connected to the column supply voltage Vdd[n] (for example, pixel circuits P(2,1), P(2,2), P(2,3) )). Please also note that in practical applications, it is not necessary to limit the connection to the column supply voltage Vdd[n] on the pixel side of the first row. That is, one row of pixel circuits can be optionally connected (for example, x=5) to be connected to the column supply voltage Vdd[n]; or Alternatively, the column supply voltage Vdd[n] is connected to pixel circuits in different rows in different columns (for example, pixel circuits with x=7 in the first column and x=3 in the second column are selected). In short, among multiple pixel circuits in the same column, one pixel circuit needs to be connected to the column supply voltage Vdd[n], and the remaining pixel circuits do not need to be connected to the column supply voltage Vdd[n].
為便於說明,本文將連接於列供應電壓Vdd[n]的像素電路定義為複合型像素電路;以及,將未連接於列供應電壓Vdd[n]的像素電路定義為受控型像素電路。接著,利用第12、13、14A、14B、14C、14D圖,說明複合型像素電路的內部架構與其操作方式;以及,利用第15、16、17A、17B、17D圖,說明受控型像素電路的內部架構與其操作方式。 For ease of description, this article defines a pixel circuit connected to the column supply voltage Vdd[n] as a composite pixel circuit; and defines a pixel circuit not connected to the column supply voltage Vdd[n] as a controlled pixel circuit. Next, use Figures 12, 13, 14A, 14B, 14C, and 14D to illustrate the internal structure and operation of the composite pixel circuit; and use Figures 15, 16, 17A, 17B, and 17D to illustrate the controlled pixel circuit The internal structure of the company and how it operates.
請參見第12圖,其係第11圖所示之LED顯示面板中的複合型像素電路P(x,n)的內部架構之示意圖。在第11圖中,受控型像素電路包含:像素電路P(1,1)、P(1,2)、P(1,3)。由於在第11圖中,假設複合型像素電路均位於第一行,因此以P(x,n)(x=1,且n=1~N)表示。 Please refer to FIG. 12, which is a schematic diagram of the internal structure of the composite pixel circuit P(x, n) in the LED display panel shown in FIG. 11. In Figure 11, the controlled pixel circuit includes: pixel circuits P(1,1), P(1,2), P(1,3). Since in Figure 11, it is assumed that the composite pixel circuits are all located in the first row, it is represented by P(x,n) (x=1, and n=1~N).
複合型像素電路P(x,n)(其中x=1)包含選擇電路SC、紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb。其中,選擇電路SC包含選擇電晶體selTFT。選擇電晶體selTFT的源極電連接於列供應電壓Vdd[n]、閘極接收閘極控制信號GC[n],且汲極電連接於分支節點Nbr。紅色發光電路LCr進一步包含發光二極體LEDr與旁路電晶體bpTFTr。發光二極體LEDr的陽極電連接於分支節點Nbr、陰極則電連接於資料線Sr[1]。另,旁路電晶體bpTFTr的源極電連接於分支節點Nbr、閘極接收放電選擇信號DSr[n],且汲極電連接於資料線Sr[1]。 發光電路LCg進一步包含發光二極體LEDg與旁路電晶體bpTFTg。發光二極體LEDg的陽極電連接於分支節點Nbr、陰極則電連接於資料線Sg[x]。另,旁路電晶體bpTFTg的源極電連接於分支節點Nbr、閘極接收放電選擇信號DSg[n],且汲極電連接於資料線Sg[x]。藍色發光電路LCb進一步包含發光二極體LEDb與旁路電晶體bpTFTb。發光二極體LEDb的陽極電連接於分支節點Nbr、陰極則電連接於資料線Sb[x]。另,旁路電晶體bpTFTr的源極電連接於分支節點Nbr、閘極接收放電選擇信號DSb[n],且汲極電連接於資料線Sb[x]。 The composite pixel circuit P(x, n) (where x=1) includes a selection circuit SC, a red light-emitting circuit LCr, a green light-emitting circuit LCg, and a blue light-emitting circuit LCb. Among them, the selection circuit SC includes a selection transistor selTFT. The source of the selection transistor selTFT is electrically connected to the column supply voltage Vdd[n], the gate receives the gate control signal GC[n], and the drain is electrically connected to the branch node Nbr. The red light-emitting circuit LCr further includes a light-emitting diode LEDr and a bypass transistor bpTFTr. The anode of the light emitting diode LEDr is electrically connected to the branch node Nbr, and the cathode is electrically connected to the data line Sr[1]. In addition, the source of the bypass transistor bpTFTr is electrically connected to the branch node Nbr, the gate receives the discharge selection signal DSr[n], and the drain is electrically connected to the data line Sr[1]. The light-emitting circuit LCg further includes a light-emitting diode LEDg and a bypass transistor bpTFTg. The anode of the light emitting diode LEDg is electrically connected to the branch node Nbr, and the cathode is electrically connected to the data line Sg[x]. In addition, the source of the bypass transistor bpTFTg is electrically connected to the branch node Nbr, the gate receives the discharge selection signal DSg[n], and the drain is electrically connected to the data line Sg[x]. The blue light-emitting circuit LCb further includes a light-emitting diode LEDb and a bypass transistor bpTFTb. The anode of the light emitting diode LEDb is electrically connected to the branch node Nbr, and the cathode is electrically connected to the data line Sb[x]. In addition, the source of the bypass transistor bpTFTr is electrically connected to the branch node Nbr, the gate receives the discharge selection signal DSb[n], and the drain is electrically connected to the data line Sb[x].
請參見第13圖,其係改變閘極控制信號GC[n]的位準,作為選取第12圖的像素電路P(x,n)之發光與否的示意圖。表7為與第12圖相關的控制信號隨著被選取用於發光的子像素電路的不同而改變狀態的列表。關於第12圖的複合型像素電路P(x,n)的狀態,如何因應第13圖所示之相關控制信號的變化而改變,將於第14A、14B、14C、14D圖說明。 Please refer to FIG. 13, which changes the level of the gate control signal GC[n] as a schematic diagram of selecting whether the pixel circuit P(x, n) in FIG. 12 emits light. Table 7 is a list of the control signals related to Fig. 12 that change states according to the sub-pixel circuits selected for light emission. Regarding the state of the composite pixel circuit P(x, n) in FIG. 12, how to change in response to the change of the related control signal shown in FIG. 13 will be described in FIGS. 14A, 14B, 14C, and 14D.
請參見第14A、14B、14C、14D圖,其係第12圖的像素電路P(x,n)因應時序控制器的控制與選擇而運作與相關的電流流向之示意圖。 Please refer to Figs. 14A, 14B, 14C, and 14D, which are schematic diagrams of the operation of the pixel circuit P(x, n) in Fig. 12 in response to the control and selection of the timing controller and the related current flow.
第14A圖對應於第12圖的複合型像素電路P(x,n)在第13圖的ta時點前或td時點之後的狀態。在ta時點之前或td時點之後,閘極控制信號GC[n]為高位準(H)。因此,選擇電晶體selTFT因閘極接收到高位準(H)的緣故而關閉(斷開)。因此,分支電壓Vbr為低位準(L)。在此同時,放電選擇信號DSr[n]、DSg[n]、DS[n]亦為低位準(L)。因此,紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb內的發光二極體LEDr、LEDg、LEDb與旁路電晶體bpTFTr、bpTFTg、bpTFTb均為斷開。據此,紅色發光電路LCr中的發光二極體LEDr、綠色發光 電路LCg中的發光二極體LEDg與藍色發光電路LCb中的發光二極體LEDb均不會發光。 Fig. 14A corresponds to the state of the composite pixel circuit P(x, n) in Fig. 12 before the time ta or after the time td in Fig. 13. Before the ta time point or after the td time point, the gate control signal GC[n] is at a high level (H). Therefore, the selective transistor selTFT is turned off (disconnected) because the gate receives the high level (H). Therefore, the branch voltage Vbr is at a low level (L). At the same time, the discharge selection signals DSr[n], DSg[n], DS[n] are also low level (L). Therefore, the light emitting diodes LEDr, LEDg, and LEDb in the red light emitting circuit LCr, the green light emitting circuit LCg, and the blue light emitting circuit LCb and the bypass transistors bpTFTr, bpTFTg, and bpTFTb are all disconnected. Accordingly, the light-emitting diode LEDr in the red light-emitting circuit LCr, the green light-emitting Neither the light-emitting diode LEDg in the circuit LCg nor the light-emitting diode LEDb in the blue light-emitting circuit LCb emits light.
在ta時點至td時點期間,閘極控制信號GC[n]為低位準(L)。因此,選擇電晶體selTFT因閘極接收到低位準(L)的緣故而導通,且資料電流ip自列供應電壓Vdd[n]流經選擇電晶體selTFT至分支節點Nbr。因此,分支電壓Vbr為高位準(H)。在ta時點至td時點這段期間,紅色發光電路LCr內的發光二極體LEDr、綠色發光電路LCg內的發光二極體LEDg、藍色發光電路LCb內的發光二極體LEDb將分別在ta時點至tb時點的期間(子像素發光期間Tspr)、tb時點至tc時點的期間(子像素發光期間Tspg),以及tc時點至td時點的期間(子像素發光期間Tspb)輪流發光。 During the period from time ta to time td, the gate control signal GC[n] is at a low level (L). Therefore, the selection transistor selTFT is turned on because the gate receives the low level (L), and the data current ip flows from the column supply voltage Vdd[n] through the selection transistor selTFT to the branch node Nbr. Therefore, the branch voltage Vbr is at a high level (H). During the period from time ta to time td, the light-emitting diode LEDr in the red light-emitting circuit LCr, the light-emitting diode LEDg in the green light-emitting circuit LCg, and the light-emitting diode LEDb in the blue light-emitting circuit LCb will be at ta respectively. The period from time tb to time tb (sub-pixel light-emitting period Tspr), the period from time tb to time tc (sub-pixel light-emitting period Tspg), and the period from time tc to time td (sub-pixel light-emitting period Tspb) alternately emit light.
第14B圖對應於第12圖的複合型像素電路P(x,n)在第13圖的ta時點至tb時點的子像素發光期間Tspr的狀態。在子像素發光期間Tspr,放電選擇信號DSr[n]為高位準(H),而放電選擇信號DSg[n]、DSb[n]為低位準(L)。高位準(H)的放電選擇信號DSr[n]使旁路電晶體bpTFTr斷開;低位準(L)的放電選擇信號DSg[n]、DSb[n]分別使旁路電晶體bpTFTg、bpTFTb導通。 FIG. 14B corresponds to the state of the sub-pixel light-emitting period Tspr from time ta to time tb in FIG. 13 from the complex pixel circuit P(x, n) in FIG. 12. During the sub-pixel light-emitting period Tspr, the discharge selection signal DSr[n] is at a high level (H), and the discharge selection signals DSg[n] and DSb[n] are at a low level (L). The high-level (H) discharge selection signal DSr[n] turns off the bypass transistor bpTFTr; the low-level (L) discharge selection signal DSg[n], DSb[n] turns on the bypass transistors bpTFTg and bpTFTb, respectively .
在紅色發光電路LCr中,旁路電晶體bpTFTr斷開,且資料電流ispr自分支節點Nbr流經發光二極體LEDr至資料線Sr[x]。因此,發光二極體LEDr在子像素發光期間Tspr將發光,且其亮度依據與資料線Sr[x]相連的電流源所決定。在發光電路LCg中,旁路電晶體bpTFTg導通,且放電電流idg自分支節點Nbr流經旁路電晶體bpTFTg至資料線Sg[x]。此時並無電流流經發光二極體LEDg,因此可確保發光二極體LEDg不會在子像素發光期間Tspr發出光線。同樣的,在藍 色發光電路LCb中,旁路電晶體bpTFTb導通,且放電電流idb自分支節點Nbr流經旁路電晶體bpTFTb至資料線Sb[x]。此時並無電流流經發光二極體LEDb,因此可確保發光二極體LEDb在子像素發光期間Tspr不會發出光線。 In the red light-emitting circuit LCr, the bypass transistor bpTFTr is disconnected, and the data current ispr flows from the branch node Nbr through the light-emitting diode LEDr to the data line Sr[x]. Therefore, the light-emitting diode LEDr emits light during the sub-pixel light-emitting period Tspr, and its brightness is determined by the current source connected to the data line Sr[x]. In the light-emitting circuit LCg, the bypass transistor bpTFTg is turned on, and the discharge current idg flows from the branch node Nbr through the bypass transistor bpTFTg to the data line Sg[x]. At this time, no current flows through the light-emitting diode LEDg, so it can be ensured that the light-emitting diode LEDg does not emit light during the light-emitting period Tspr of the sub-pixel. The same in blue In the color light emitting circuit LCb, the bypass transistor bpTFTb is turned on, and the discharge current idb flows from the branch node Nbr through the bypass transistor bpTFTb to the data line Sb[x]. At this time, no current flows through the light-emitting diode LEDb, so it can be ensured that the light-emitting diode LEDb does not emit light during the light-emitting period Tspr of the sub-pixel.
第14B圖對應於第12圖的複合型像素電路P(x,n)在第13圖的ta時點至tb時點期間(子像素發光期間Tspr)的狀態。在子像素發光期間Tspr,放電選擇信號DSr[n]為高位準(H),而放電選擇信號DSg[n]、DSb[n]為低位準(L)。高位準(H)的放電選擇信號DSr[n]使旁路電晶體bpTFTr斷開;低位準(L)的放電選擇信號DSg[n]、DSb[n]分別使旁路電晶體bpTFTg、bpTFTb導通。據此,紅色發光電路LCr中的發光二極體LEDr將發光,而發光電路LCg中的發光二極體LEDg與發光電路LCg中的發光二極體LEDg並不會發光。 FIG. 14B corresponds to the state of the composite pixel circuit P(x, n) in FIG. 12 during the period from time ta to time tb in FIG. 13 (sub-pixel light-emitting period Tspr). During the sub-pixel light-emitting period Tspr, the discharge selection signal DSr[n] is at a high level (H), and the discharge selection signals DSg[n] and DSb[n] are at a low level (L). The high-level (H) discharge selection signal DSr[n] turns off the bypass transistor bpTFTr; the low-level (L) discharge selection signal DSg[n], DSb[n] turns on the bypass transistors bpTFTg and bpTFTb, respectively . Accordingly, the light-emitting diode LEDr in the red light-emitting circuit LCr will emit light, but the light-emitting diode LEDg in the light-emitting circuit LCg and the light-emitting diode LEDg in the light-emitting circuit LCg will not emit light.
第14C圖對應於第12圖的複合型像素電路P(x,n)在第13圖的tb時點至tc時點期間(子像素發光期間Tspg)的狀態。在子像素發光期間Tspg,放電選擇信號DSg[n]為高位準(H),而放電選擇信號DSr[n]、DSb[n]為低位準(L)。高位準(H)的放電選擇信號DSg[n]使旁路電晶體bpTFTg斷開;低位準(L)的放電選擇信號DSr[n]、DSb[n]分別使旁路電晶體bpTFTr、bpTFTb導通。據此,發光電路LCg中的發光二極體LEDg將發光,而紅色發光電路LCr中的發光二極體LEDr與藍色發光電路LCb中的發光二極體LEDb並不會發光。 Fig. 14C corresponds to the state of the composite pixel circuit P(x, n) in Fig. 12 from time tb to time tc in Fig. 13 (sub-pixel light-emitting period Tspg). During the sub-pixel emission period Tspg, the discharge selection signal DSg[n] is at a high level (H), and the discharge selection signals DSr[n] and DSb[n] are at a low level (L). The high level (H) discharge selection signal DSg[n] turns off the bypass transistor bpTFTg; the low level (L) discharge selection signal DSr[n], DSb[n] turns on the bypass transistors bpTFTr and bpTFTb respectively . Accordingly, the light emitting diode LEDg in the light emitting circuit LCg will emit light, while the light emitting diode LEDr in the red light emitting circuit LCr and the light emitting diode LEDb in the blue light emitting circuit LCb will not emit light.
第14D圖對應於第12圖的複合型像素電路P(x,n)在第13圖的tc時點至td時點期間(子像素發光期間Tspb)的狀態。在子像素發光期間Tspb,放電選擇信號DSb[n]為高位準(H),而放電選擇信號DSr[n]、DSg[n]為低位準(L)。高位準(H)的放電選擇信號DSb[n]使旁 路電晶體bpTFTb斷開;低位準(L)的放電選擇信號DSr[n]、DSg[n]分別使旁路電晶體bpTFTr、bpTFTg導通。據此,藍色發光電路LCb的發光二極體LEDb將發光,而紅色發光電路LCr的發光二極體LEDr與發光電路LCg中的發光二極體LEDg並不會發光。 FIG. 14D corresponds to the state of the composite pixel circuit P(x, n) in FIG. 12 during the period from time tc to time td in FIG. 13 (sub-pixel light-emitting period Tspb). During the sub-pixel emission period Tspb, the discharge selection signal DSb[n] is at a high level (H), and the discharge selection signals DSr[n] and DSg[n] are at a low level (L). The high-level (H) discharge selection signal DSb[n] makes the side The circuit transistor bpTFTb is disconnected; the low-level (L) discharge selection signals DSr[n] and DSg[n] respectively turn on the bypass transistors bpTFTr and bpTFTg. Accordingly, the light emitting diode LEDb of the blue light emitting circuit LCb will emit light, while the light emitting diode LEDr of the red light emitting circuit LCr and the light emitting diode LEDg of the light emitting circuit LCg will not emit light.
表8為複合型像素電路P(x,n)內的元件因應控制信號的不同而處於不同狀態的列表。 Table 8 is a list of elements in the composite pixel circuit P(x, n) in different states according to different control signals.
請參見第15圖,其係第11圖所示之LED顯示面板中受控型像素電路P(x,n)(其中x=2~M/3,且n=1~N)之示意圖。在第11圖中,假設受控型像素電路設置在除第一行以外的各行。因此,受控型像素電路包含:像素電路P(2,1)、P(2,2)、P(2,3)。即,P(x,n),其中1<xM/3。受控型像素電路僅包含紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb,但不包含選擇電路SC。換言之,可以將受 控型像素電路內的紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb視為其子像素電路。 Please refer to Figure 15, which is a schematic diagram of the controlled pixel circuit P(x,n) (where x=2~M/3, and n=1~N) in the LED display panel shown in Figure 11. In Fig. 11, it is assumed that the controlled type pixel circuit is arranged in each row except the first row. Therefore, the controlled pixel circuit includes: pixel circuits P(2,1), P(2,2), P(2,3). That is, P(x,n), where 1<x M/3. The controlled pixel circuit only includes a red light-emitting circuit LCr, a green light-emitting circuit LCg, and a blue light-emitting circuit LCb, but does not include the selection circuit SC. In other words, the red light-emitting circuit LCr, the green light-emitting circuit LCg, and the blue light-emitting circuit LCb in the controlled pixel circuit can be regarded as its sub-pixel circuits.
紅色發光電路LCr包含彼此並聯的發光二極體LEDr與旁路電晶體bpTFTr。在發光電路LCr中,發光二極體LEDr的陽極電連接於分支節點Nbr、陰極則電連接於資料線Sr[1]。另,旁路電晶體bpTFTr的源極電連接於分支節點Nbr、閘極接收放電選擇信號DSr[n],且汲極電連接於資料線Sr[x]。 The red light emitting circuit LCr includes a light emitting diode LEDr and a bypass transistor bpTFTr connected in parallel with each other. In the light-emitting circuit LCr, the anode of the light-emitting diode LEDr is electrically connected to the branch node Nbr, and the cathode is electrically connected to the data line Sr[1]. In addition, the source of the bypass transistor bpTFTr is electrically connected to the branch node Nbr, the gate receives the discharge selection signal DSr[n], and the drain is electrically connected to the data line Sr[x].
發光電路LCg包含彼此並聯的發光二極體LEDg與旁路電晶體bpTFTg。在發光電路LCg中,發光二極體LEDg的陽極電連接於分支節點Nbg、陰極則電連接於資料線Sg[x]。另,旁路電晶體bpTFTg的源極電連接於分支節點Nbr、閘極接收放電選擇信號DSg[n],且汲極電連接於資料線Sg[x]。 The light-emitting circuit LCg includes a light-emitting diode LEDg and a bypass transistor bpTFTg connected in parallel with each other. In the light emitting circuit LCg, the anode of the light emitting diode LEDg is electrically connected to the branch node Nbg, and the cathode is electrically connected to the data line Sg[x]. In addition, the source of the bypass transistor bpTFTg is electrically connected to the branch node Nbr, the gate receives the discharge selection signal DSg[n], and the drain is electrically connected to the data line Sg[x].
藍色發光電路LCb包含彼此並聯的發光二極體LEDb與旁路電晶體bpTFTb。在藍色發光電路LCb中,發光二極體LEDb的陽極電連接於分支節點Nbr、陰極則電連接於資料線Sb[x]。另,旁路電晶體bpTFTb的源極電連接於分支節點Nbr、閘極接收放電選擇信號DSb[n],且汲極電連接於資料線Sb[x]。 The blue light-emitting circuit LCb includes a light-emitting diode LEDb and a bypass transistor bpTFTb connected in parallel with each other. In the blue light-emitting circuit LCb, the anode of the light-emitting diode LEDb is electrically connected to the branch node Nbr, and the cathode is electrically connected to the data line Sb[x]. In addition, the source of the bypass transistor bpTFTb is electrically connected to the branch node Nbr, the gate receives the discharge selection signal DSb[n], and the drain is electrically connected to the data line Sb[x].
請參見第16圖,其係改變閘極控制信號GC[n]的位準,作為選取第13圖的像素電路P(x,n)(其中x=2~M/3,且n=1~N)之發光與否的示意圖。請同時參見表9、第15圖與第16圖。 Please refer to Figure 16, which is to change the level of the gate control signal GC[n] to select the pixel circuit P(x,n) in Figure 13 (where x=2~M/3, and n=1~ N) Schematic diagram of whether to emit light or not. Please refer to Table 9, Figure 15 and Figure 16 at the same time.
請參見第17A、17B、17C、17D圖,其係第15圖的像素電路P(x,n)因應時序控制器的控制與選擇而運作與相關的電流流向之示意圖。 Please refer to Figures 17A, 17B, 17C, and 17D, which are schematic diagrams of the operation of the pixel circuit P(x, n) in Figure 15 in response to the control and selection of the timing controller and the related current flow.
第17A圖對應於第15圖的受控型像素電路P(x,n)(x=2~M/3)在第16圖的ta時點前或td時點之後的狀態。在ta時點前或td時點後,分支電壓Vbr為低位準(L)。在此同時,放電選擇信號DSr[n]、DSg[n]、DSb[n]亦為低位準(L)。因此,紅色發光電路LCr、綠色發光電路LCg、藍色發光電路LCb內的發光二極體LEDr、LEDg、LEDb均未發光,且旁路電晶體bpTFTr、bpTFTg、bpTFTb均為斷開。 Fig. 17A corresponds to the state of the controlled pixel circuit P(x,n) (x=2~M/3) in Fig. 15 before the time ta or after the time td in Fig. 16. Before the ta time point or after the td time point, the branch voltage Vbr is at a low level (L). At the same time, the discharge selection signals DSr[n], DSg[n], DSb[n] are also low level (L). Therefore, the light-emitting diodes LEDr, LEDg, and LEDb in the red light-emitting circuit LCr, green light-emitting circuit LCg, and blue light-emitting circuit LCb do not emit light, and the bypass transistors bpTFTr, bpTFTg, and bpTFTb are all off.
在ta時點至td時點期間,分支電壓Vbr為高位準(H)。在這段期間,紅色發光電路LCr的發光二極體LEDr、綠色發光電路LCg 內的發光二極體LEDg、藍色發光電路LCb內的發光二極體LEDb將分別在ta時點至tb時點的期間(子像素發光期間Tspr)、tb時點至tc時點的期間(子像素發光期間Tspg),以及tc時點至td時點的期間輪流發光(子像素發光期間Tspb)。 During the period from time ta to time td, the branch voltage Vbr is at a high level (H). During this period, the light-emitting diode LEDr of the red light-emitting circuit LCr and the green light-emitting circuit LCg The light-emitting diode LEDg in the internal light-emitting diode LEDg and the light-emitting diode LEDb in the blue light-emitting circuit LCb will be in the period from the time ta to the time tb (sub-pixel emission period Tspr), and the period from the time tb to the time tc (sub-pixel emission period). Tspg), and emit light alternately from time tc to time td (sub-pixel light-emitting period Tspb).
第17B圖對應於第15圖的受控型像素電路P(x,n)(x=2~M/3)在第16圖的ta時點至tb時點期間(子像素發光期間Tspr)的狀態。在子像素發光期間Tspr,放電選擇信號DSr[n]為高位準(H),而放電選擇信號DSg[n]、DSb[n]為低位準(L)。高位準(H)的放電選擇信號DSr[n]使旁路電晶體bpTFTr斷開;低位準(L)的放電選擇信號DSg[n]、DSb[n]分別使旁路電晶體bpTFTg、bpTFTb導通。據此,紅色發光電路LCr中的發光二極體LEDr將發光,而發光電路LCg中的發光二極體LEDg與發光電路LCg中的發光二極體LEDg並不會發光。 Fig. 17B corresponds to the state of the controlled pixel circuit P(x,n) (x=2~M/3) in Fig. 15 from the time ta to the time tb in Fig. 16 (the sub-pixel light-emitting period Tspr). During the sub-pixel light-emitting period Tspr, the discharge selection signal DSr[n] is at a high level (H), and the discharge selection signals DSg[n] and DSb[n] are at a low level (L). The high-level (H) discharge selection signal DSr[n] turns off the bypass transistor bpTFTr; the low-level (L) discharge selection signal DSg[n], DSb[n] turns on the bypass transistors bpTFTg and bpTFTb, respectively . Accordingly, the light-emitting diode LEDr in the red light-emitting circuit LCr will emit light, but the light-emitting diode LEDg in the light-emitting circuit LCg and the light-emitting diode LEDg in the light-emitting circuit LCg will not emit light.
第17C圖對應於第15圖的受控型像素電路P(x,n)(x=2~M/3)在第16圖的tb時點至tc時點期間(子像素發光期間Tspg)的狀態。在子像素發光期間Tspg,放電選擇信號DSg[n]為高位準(H),而放電選擇信號DSr[n]、DSb[n]為低位準(L)。高位準(H)的放電選擇信號DSg[n]使旁路電晶體bpTFTg斷開;低位準(L)的放電選擇信號DSr[n]、DSb[n]分別使旁路電晶體bpTFTr、bpTFTb導通。據此,發光電路LCg中的發光二極體LEDg將發光,而紅色發光電路LCr中的發光二極體LEDr與藍色發光電路LCb中的發光二極體LEDb並不會發光。 Fig. 17C corresponds to the state of the controlled pixel circuit P(x,n) (x=2~M/3) in Fig. 15 from time tb to time tc in Fig. 16 (sub-pixel light-emitting period Tspg). During the sub-pixel emission period Tspg, the discharge selection signal DSg[n] is at a high level (H), and the discharge selection signals DSr[n] and DSb[n] are at a low level (L). The high level (H) discharge selection signal DSg[n] turns off the bypass transistor bpTFTg; the low level (L) discharge selection signal DSr[n], DSb[n] turns on the bypass transistors bpTFTr and bpTFTb respectively . Accordingly, the light emitting diode LEDg in the light emitting circuit LCg will emit light, while the light emitting diode LEDr in the red light emitting circuit LCr and the light emitting diode LEDb in the blue light emitting circuit LCb will not emit light.
第17D圖對應於第15圖的受控型像素電路P(x,n)(x=2~M/3)在第16圖的tc時點至td時點期間(子像素發光期間Tspb)的狀態。在子像素發光期間Tspb,放電選擇信號DSb[n]為高位準(H),而放電選擇信號DSr[n]、DSg[n]為低位準(L)。高位準(H)的放電選擇 信號DSb[n]使旁路電晶體bpTFTb斷開;低位準(L)的放電選擇信號DSr[n]、DSg[n]分別使旁路電晶體bpTFTr、bpTFTg導通。據此,藍色發光電路LCb中的發光二極體LEDb將發光,而紅色發光電路LCr中的發光二極體LEDr與發光電路LCg中的發光二極體LEDg並不會發光。 Fig. 17D corresponds to the state of the controlled pixel circuit P(x,n) (x=2~M/3) in Fig. 15 from time tc to time td in Fig. 16 (sub-pixel light-emitting period Tspb). During the sub-pixel emission period Tspb, the discharge selection signal DSb[n] is at a high level (H), and the discharge selection signals DSr[n] and DSg[n] are at a low level (L). High level (H) discharge selection The signal DSb[n] turns off the bypass transistor bpTFTb; the low-level (L) discharge selection signals DSr[n] and DSg[n] turn on the bypass transistors bpTFTr and bpTFTg respectively. Accordingly, the light emitting diode LEDb in the blue light emitting circuit LCb will emit light, while the light emitting diode LEDr in the red light emitting circuit LCr and the light emitting diode LEDg in the light emitting circuit LCg will not emit light.
表10為受控型像素電路P(x,n)(x=2~M/3)內的元件因應控制信號的不同而處於不同狀態的列表。 Table 10 is a list of elements in the controlled pixel circuit P(x,n) (x=2~M/3) that are in different states according to different control signals.
請參見第18圖,其係控制第11圖所示之LED顯示面板的波形圖。請同時參看第11圖與第18圖。第18圖的橫軸為時間,其中並以t1時點至t10時點代表不同的時點。t1時點至t4時點對應於像素電路P(1,1)、P(2,1)的像素顯示期間;t4時點至t7時點對應於像素電路P(2,1)、P(2,2)的像素顯示期間;t7時點至t10時點對應於像素電路P(1,3)、P(2,3)的像素顯示期間。 Please refer to Figure 18, which is a waveform diagram for controlling the LED display panel shown in Figure 11. Please refer to Figure 11 and Figure 18 at the same time. The horizontal axis in Figure 18 is time, and time t1 to time t10 are used to represent different time points. From t1 to t4 corresponds to the pixel display period of pixel circuits P(1,1) and P(2,1); from t4 to t7 corresponds to the pixel circuits P(2,1) and P(2,2) Pixel display period; t7 to t10 corresponds to the pixel display period of the pixel circuits P(1,3) and P(2,3).
由於列供應電壓Vdd[1]、Vdd[2]、Vdd[3]直接連接至發光二極體電壓VLED的緣故,列供應電壓Vdd[1]、Vdd[2]、Vdd[3]的電壓不因時點的不同而改變。關於各個像素電路如何因應相關的控制信號而呈現的不同的狀態,分別與第14A~14D、17A~17D圖相似。以下,以表11彙整各個像素電路在不同期間的狀態。 Because the column supply voltages Vdd[1], Vdd[2], Vdd[3] are directly connected to the light-emitting diode voltage V LED , the column supply voltages Vdd[1], Vdd[2], Vdd[3] are Does not change due to different time points. Regarding how each pixel circuit presents different states in response to related control signals, it is similar to Figures 14A to 14D and 17A to 17D, respectively. Below, Table 11 summarizes the states of each pixel circuit in different periods.
根據前述說明可以得知,本案的實施例改變發光電路LC的設計。發光電路LC包含發光二極體LED與旁路電晶體bpTFT。當發光電路LC被選取而發光時,資料電流isp流經發光二極體LED;當發光電路LC未被選取時,放電電流id將流經旁路電晶體bpTFT。此外,根據實施例的不同,可能針對每個發光電路LC設置相對應的選擇電路SC。或者,同列的發光電路LC可共用一個選擇電路SC[n]。其中,選擇電路SC內的選擇電晶體selTFT由閘極控制信號GC控制,與發光電路LC內的旁路電晶體bpTFT由放電選擇信號DS控制。此外,閘極控制信號GC與放電選擇信號DS之間的位準維持反向。 According to the foregoing description, the embodiment of this case changes the design of the light-emitting circuit LC. The light-emitting circuit LC includes a light-emitting diode LED and a bypass transistor bpTFT. When the light-emitting circuit LC is selected to emit light, the data current isp flows through the light-emitting diode LED; when the light-emitting circuit LC is not selected, the discharge current id will flow through the bypass transistor bpTFT. In addition, depending on the embodiment, a corresponding selection circuit SC may be provided for each light-emitting circuit LC. Alternatively, the light-emitting circuits LC in the same column can share one selection circuit SC[n]. Among them, the selection transistor selTFT in the selection circuit SC is controlled by the gate control signal GC, and the bypass transistor bpTFT in the light-emitting circuit LC is controlled by the discharge selection signal DS. In addition, the level between the gate control signal GC and the discharge selection signal DS remains reversed.
當LED顯示面板採用前述架構時,由於發光電路同時設有發光二極體LED與旁路電晶體bpTFT的緣故,旁路電晶體bpTFT能在發光二極體LED未被選取時,使發光二極體LED兩端的壓差維持小於順向電壓Vf。因此,因此,發光電路LC僅在確實被選取要發光的時候才會發光,進而避免鬼影現象產生。 When the LED display panel adopts the aforementioned structure, because the light-emitting circuit is equipped with both the light-emitting diode LED and the bypass transistor bpTFT, the bypass transistor bpTFT can make the light-emitting diode when the light-emitting diode LED is not selected. The voltage difference between the two ends of the bulk LED is maintained to be less than the forward voltage Vf. Therefore, therefore, the light-emitting circuit LC will only emit light when it is indeed selected to emit light, thereby avoiding ghosting.
綜上所述,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。本發明所屬技術領域中具有通常知識者,在不脫離本發明之精神和範圍內,當可作各種之更動與潤飾。因此,本發明之保護範圍當視後附之申請專利範圍所界定者為準。 In summary, although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.
Vdd[n]:供應電壓 Vdd[n]: supply voltage
VLED:發光二極體電壓 V LED : Light-emitting diode voltage
GC[n]:閘極控制線(信號) GC[n]: Gate control line (signal)
DS[n]:放電選擇線(信號) DS[n]: Discharge selection line (signal)
selTFT:選擇電晶體 selTFT: select transistor
Cp:寄生電容 Cp: Parasitic capacitance
Nbr:分支節點 Nbr: branch node
Vbr:分支電壓 Vbr: branch voltage
bpTFT:旁路電晶體 bpTFT: Bypass transistor
LED:發光二極體 LED: light emitting diode
S[m]:資料線 S[m]: data line
SP(m,n):子像素電路 SP(m,n): Sub-pixel circuit
LC:發光電路 LC: Light-emitting circuit
SC:選擇電路 SC: select circuit
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TW202122879A (en) | 2021-06-16 |
CN111540307B (en) | 2021-08-06 |
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