WO2022164078A1 - 기판 효과를 제거한 OLEDoS 화소 보상 회로 및 그 제어 방법 - Google Patents
기판 효과를 제거한 OLEDoS 화소 보상 회로 및 그 제어 방법 Download PDFInfo
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- 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
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Definitions
- T4 is turned off, the OLED is turned off, and T1 and T3 are turned on.
- the voltage difference between the source and the gate is set as a threshold voltage and stored in the capacitors C1 and C2.
- a driving transistor for driving the OLED device by a data signal voltage applied to a gate electrode connected to a second node and connecting a power supply voltage and a third node; a first transistor switched by the current scan signal SCAN[n] and transferring an input data signal voltage to a second storage battery connected to the first node; a second transistor switched by the compensation signal and configured to transmit a reference voltage to a second storage battery connected to the first node; a third transistor switched by a scan signal SCAN[n-2] two timings earlier than the current scan signal, and transferring the reference voltage to a second node between the first battery and the second battery; a fourth transistor switched by a scan signal SCAN[n-1] one timing earlier than the current scan signal and connecting the second node and the third node; a fifth transistor switched by a light emitting signal and connected between the third node and the other end of the OLED device having one end connected to the ground; a first storage battery connected between the power supply voltage and the second node; and a second storage
- the first to fifth transistors and the driving transistor are P-type transistors.
- the OLED device is characterized in that OLEDoS (OLED on Silicon).
- the body of the first to fifth transistors and the driving transistor is connected to the power supply voltage.
- FIG. 2 is a structural diagram of a pixel compensation circuit according to a preferred embodiment of the present invention.
- 3 to 6 show the operation of the pixel compensation circuit for each timing according to a preferred embodiment of the present invention.
- FIG. 7 and 8 show effects of a pixel compensation circuit according to a preferred embodiment of the present invention.
- FIG. 9 is a flowchart of a method for controlling a pixel compensation circuit according to another preferred embodiment of the present invention.
- FIG. 2 is a structural diagram of a pixel compensation circuit according to a preferred embodiment of the present invention.
- the pixel compensation circuit according to the present invention is composed of six transistors and two storage batteries to eliminate the substrate effect. All transistors used in the present invention may be P-type transistors.
- the OLED which is a light emitting device, may be OLEDoS (OLED on Silicon).
- the first transistor T1 is switched by the current scan signal SCAN[n] and transfers the data voltage DATA to the second storage battery C2 connected to the first node N1 .
- the third transistor T3 is switched by the scan signal SCAN[n-2] two timings earlier than the current scan signal SCAN[n] and transfers the reference voltage Vref to the first storage battery C2 and the second It transfers to the second node N2 between the storage batteries C1.
- the fourth transistor T4 is switched by the scan signal SCAN[n-1] one timing earlier than the current scan signal SCAN[n] and passes between the second node N2 and the third node N3. Connect.
- the fifth transistor T5 is switched by the light emitting signal EM[n] and connects the other end of the OLED device having one end connected to the ground GND and the third node N3 .
- the first storage battery C1 is connected between the power supply voltage VDD and the second node N2 .
- the second storage battery C2 connects between the first node N1 and the second node N2 .
- the pixel compensation circuit according to the present invention may be driven in four stages: initialization, threshold voltage sensing, information input, and light emission.
- 3 to 6 show the operation of the pixel compensation circuit for each timing according to a preferred embodiment of the present invention.
- Step 4 is performed in one frame time.
- the initialization, threshold voltage detection, and information input steps are performed during one line time, respectively, and the light emission step is performed in the remaining time after subtracting three line times from one frame time. is done
- the reference voltage Vref signal is transmitted to the second storage battery C2 through the second transistor T2 and is transmitted and stored in the first storage battery C1 through the third transistor T3 .
- the power supply voltage VDD and the reference voltage Vref are applied to both ends of the first storage battery C1, and the reference voltage Vref is applied to both ends of the second storage battery C2. erased and reset
- FIG. 4 shows the on-off state of each transistor and timing of the control signals in the threshold voltage sensing step.
- the compensation signal COMP[n] is still 0 and the scan signal SCAN[n-1] before one timing is 0, so the second transistor T2 and the fourth transistor T4 are turned on. it becomes
- the gate voltage of the driving transistor TD reaches VDD-V th,TD along the gate and the source of the driving transistor TD connected to the fourth transistor T4 by the fourth transistor T4 .
- the first charge amount Q 1 charged in the first storage battery C1 and the second storage battery C2 can be obtained by the following equation.
- FIG. 5 shows the on/off state of each transistor and timing of the control signals in the information input stage.
- the data voltage V DATA transferred to the second storage battery C2 changes the gate voltage of the driving transistor TD.
- the second charge amount Q 2 which is the changed charge amount charged in the first storage battery C1 and the second storage battery C2 , can be obtained by the following equation.
- the gate voltage Vx of the driving transistor TD can be obtained as follows.
- Vx (C 1 (V DATA -V ref )/(C 1 -C 2 ))-VDD-V th,TD
- FIG. 6 shows the on/off state of each transistor in the light emitting stage and timing of control signals.
- Vx which is the gate voltage of the driving transistor TD
- FIG. 9 is a flowchart illustrating a method of controlling a pixel compensation circuit according to another preferred embodiment of the present invention.
- the method of controlling the OLED pixel compensation circuit shown in FIG. 2 of the present invention consists of four steps.
- the compensation signal COMP[n] and the scan signal SCAN[n-2] two timings before are set to zero.
- the second transistor T2 and the third transistor T3 are turned on, the first storage battery C1 and the second storage battery C2 are initialized.
- the fourth transistor T4 is turned on, and the gate voltage of the driving transistor TD connected to the fourth transistor T4 is set. Also, the first storage battery C1 and the second storage battery C3 are charged by the threshold voltage of the driving transistor TD.
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- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
Description
Claims (5)
- OLED 소자;제2 노드에 연결된 게이트 전극에 인가되는 데이터 신호 전압에 의해 상기 OLED 소자를 구동하고, 전원 전압과 제3 노드 사이를 연결하는 구동 트랜지스터;현재 스캔 신호(SCAN[n])에 의해 스위칭되고, 입력되는 데이터 신호 전압을 제1 노드에 연결된 제2 축전지에 전달하는 제1 트랜지스터;보상 신호에 의해 스위칭되고, 기준 전압을 상기 제1 노드에 연결된 제2 축전지에 전달하는 제2 트랜지스터;상기 현재 스캔 신호보다 두 타이밍 이전의 스캔 신호(SCAN[n-2])에 의해 스위칭되고, 상기 기준 전압을 제1 축전지와 상기 제2 축전지 사이의 제2 노드에 전달하는 제3 트랜지스터;상기 현재 스캔 신호보다 한 타이밍 이전의 스캔 신호(SCAN[n-1])에 의해 스위칭되고, 상기 제2 노드와 상기 제3 노드 사이를 연결하는 제4 트랜지스터;발광 신호에 의해 스위칭되고, 일단이 접지와 연결된 OLED 소자의 타단과 상기 제3 노드 사이를 연결하는 제5 트랜지스터;상기 전원 전압과 상기 제2 노드 사이에 연결된 제1 축전지; 및상기 제1 노드와 상기 제2 노드 사이에 연결된 제2 축전지;를 포함하는, OLED 화소 보상 회로.
- 제1항에 있어서,상기 제1 내지 제5 트랜지스터 및 구동 트랜지스터는 P형 트랜지스터인 것을 특징으로 하는, OLED 화소 보상 회로.
- 제1항에 있어서,상기 OLED 소자는 OLEDoS(OLED on Silicon)인 것을 특징으로 하는, OLED 화소 보상 회로.
- 제1항에 있어서,상기 제1 내지 제5 트랜지스터 및 상기 구동 트랜지스터의 바디(body)는 상기 전원 전압에 연결되는 것을 특징으로 하는, OLED 화소 보상 회로.
- 제1항에 따른 OLED 화소 보상 회로의 제어 방법에 있어서:(a) 상기 제2 트랜지스터와 제3 트랜지스터를 켜고(Turn-on) 나머지 트랜지스터들을 끄는(Turn-off) 초기화 단계;(b) 상기 제2 트랜지스터는 켜진 상태를 유지하고 상기 제4 트랜지스터를 켜고 나머지 트랜지스터들은 끄는 문턱전압 감지 단계;(c) 상기 제1 트랜지스터만 켜고 나머지 트랜지스터들은 끄는 정보 입력 단계; 및(d) 상기 제5 트랜지스터만 켜고 상기 제1 내지 제4 트랜지스터들은 끄고, 상기 구동 트랜지스터는 상기 제2 노드의 전압에 의해 스위칭되어 상기 OLED 소자를 구동하는 발광 단계;를 포함하는, OLED 화소 보상 회로의 제어 방법.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2023569593A JP7566267B2 (ja) | 2021-01-26 | 2022-01-11 | 基板効果を除去したOLEDoS画素補償回路およびその制御方法 |
US18/263,047 US12039933B2 (en) | 2021-01-26 | 2022-01-11 | OLEDoS pixel compensation circuit for removing substrate effect, and method for controlling same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR10-2021-0010917 | 2021-01-26 | ||
KR1020210010917A KR102628633B1 (ko) | 2021-01-26 | 2021-01-26 | 기판 효과를 제거한 OLEDoS 화소 보상 회로 및 그 제어 방법 |
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WO2024051204A1 (zh) * | 2022-09-08 | 2024-03-14 | 惠科股份有限公司 | 驱动电路、驱动方法及显示面板 |
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WO2024174063A1 (zh) * | 2023-02-20 | 2024-08-29 | 京东方科技集团股份有限公司 | 像素电路、显示面板、显示装置及驱动方法 |
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- 2022-01-11 WO PCT/KR2022/000419 patent/WO2022164078A1/ko active Application Filing
- 2022-01-11 US US18/263,047 patent/US12039933B2/en active Active
- 2022-01-11 JP JP2023569593A patent/JP7566267B2/ja active Active
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JP7566267B2 (ja) | 2024-10-15 |
KR20220107797A (ko) | 2022-08-02 |
US20240087519A1 (en) | 2024-03-14 |
JP2024510535A (ja) | 2024-03-07 |
KR102628633B1 (ko) | 2024-01-25 |
US12039933B2 (en) | 2024-07-16 |
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