WO2021068492A1 - Micro-display driving circuit capable of improving wide-dynamic-range brightness adjustment, and brightness adjustment method - Google Patents

Micro-display driving circuit capable of improving wide-dynamic-range brightness adjustment, and brightness adjustment method Download PDF

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Publication number
WO2021068492A1
WO2021068492A1 PCT/CN2020/087896 CN2020087896W WO2021068492A1 WO 2021068492 A1 WO2021068492 A1 WO 2021068492A1 CN 2020087896 W CN2020087896 W CN 2020087896W WO 2021068492 A1 WO2021068492 A1 WO 2021068492A1
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type mos
mos tube
oled
voltage
brightness adjustment
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PCT/CN2020/087896
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French (fr)
Chinese (zh)
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秦昌兵
张白雪
徐亭亭
陈啟宏
杨建兵
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南京国兆光电科技有限公司
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Publication of WO2021068492A1 publication Critical patent/WO2021068492A1/en

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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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element

Definitions

  • the invention relates to a method for adjusting the brightness of a silicon-based micro-display driving circuit, which belongs to the field of microelectronics and display technology.
  • Micro display is a branch of the display technology field, which realizes the combination of display technology and silicon-based integrated circuit technology.
  • the existing micro-displays mainly include: CRT micro-display, Digital Mirror Device (DMD), LCD micro-display, Liquid Crystal on Silicon (LCoS) micro-display, silicon-based organic light-emitting Diode (Organic Light Emitting Diode on Silicon, OLED-on-Silicon) micro display, LED micro display, etc.
  • the pixel circuit directly drives the OLED and LED to emit light, so the pixel circuit structure determines the brightness and contrast of the OLED and LED. In the constant voltage driving mode, the luminous brightness of OLED and LED increases with the increase of the driving current.
  • the brightness of the display can be adjusted directly by changing the size of the common cathode voltage. As shown in Figure 1, it is represented by the specific pixels in the dotted frame Circuit 1.
  • An external voltage source Vdata and an external OLED are formed.
  • the drain of the P-type MOS tube MP is connected to the positive terminal of the input voltage source Vdata, and the source of the P-type MOS tube MP is connected with one end of the capacitor C and the gate of the N-type MOS tube MN.
  • the gate of the P-type MOS tube MP is connected to the row selection control signal SEL1.
  • the negative terminal of the voltage source Vdata and the other terminal of the capacitor C are connected to the ground GND.
  • the drain of the N-type MOS tube MN is connected to the voltage VDD, and the source of the N-type MOS tube MN is connected to the anode of the OLED.
  • the cathode of the OLED is connected to the Vcom voltage; its working process is: when the row selection control signal SEL1 is low, the switch tube MP is turned on, the driving signal data Vdata is written into the storage capacitor C, and the driving tube MN is turned on to drive the OLED to emit light.
  • the drive current corresponds to Vdata and adjusts the brightness of the pixel.
  • SEL1 is at a high level
  • the switching tube MP is turned off, Vdata has been stored in C, MN is still in the on phase, and the drive current remains unchanged.
  • the brightness of the OLED can be adjusted by adjusting the size of the OLED cathode voltage VCOM.
  • the greater the absolute value of VCOM the greater the voltage difference across the OLED and the greater the current flowing through the OLED. Larger, the higher the luminous brightness. This method cannot achieve wide dynamic range dimming with suitable uniformity.
  • changing the size of the common cathode voltage VCOM will cause the gamma (GAMMA) characteristics of the OLED and LED to change, which will affect the display effect.
  • the purpose of the present invention is to solve the problem that the existing brightness adjustment circuit cannot obtain a wide dynamic range dimming with suitable uniformity, and to design a micro display driving circuit that can improve the wide dynamic range brightness adjustment, and provide corresponding The brightness adjustment method.
  • PFM Pulse Frequency Modulation
  • the number of pulses is used to adjust the common cathode voltage to achieve brightness adjustment, so that the microdisplay can maintain the consistency of grayscale and chromaticity in the entire brightness range.
  • a micro-display driving circuit capable of improving wide dynamic range and brightness adjustment. It includes a P-type MOS tube MP1, a P-type MOS tube MP2, a capacitor C1, an N-type MOS tube MN1 and an N-type MOS tube MN2.
  • the drain of the P-type MOS tube MP1 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP1 is connected to one end of the capacitor C1 and the gate of the N-type MOS tube MN1; the gate of the P-type MOS tube MP1 Connect to the external control signal SEL2; the negative terminal of the voltage source Vdata and the other end of the capacitor C1 are connected to the ground GND; the drain of the N-type MOS tube MN1 is connected to the voltage VDD, and the source of the N-type MOS tube MN1 is connected to the anode of the OLED, The cathode of the OLED is connected to the drain of the P-type MOS tube MP2 and the drain of the N-type MOS tube MN2; the source of the P-type MOS tube MP2 is connected to the ground GND, and the gate of the P-type MOS tube MP2 is connected to the N-type MOS tube MN2.
  • the gate of N is connected to VPULSE, and the source of N-type MOS transistor MN2 is connected to Vcom.
  • VPULSE changes from 0 to N
  • the data voltage Vdata does not change
  • the anode voltage of the OLED does not change
  • the current flowing through the OLED does not change.
  • the change of N only affects the on-time of the constant current flowing through the OLED.
  • the constant current is constant, the light-emitting characteristics of the OLED will not change.
  • the VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
  • a micro-display driving circuit capable of improving wide dynamic range and brightness adjustment. It includes P-type MOS tube MP3, P-type MOS tube MP4, capacitor C2, N-type MOS tube MN3 and N-type MOS tube MN4, and is characterized by the The drain of the P-type MOS tube MP3 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP3 is connected to one end of the capacitor C2 and the gate of the N-type MOS tube MN3; the gate of the P-type MOS tube MP3 Connected to the external control signal SEL3; the negative terminal of the voltage source Vdata and the other end of the capacitor C2 are connected to the ground GND; the drain of the N-type MOS transistor MN3 and the drain of the P-type MOS transistor MP4 and the drain of the N-type MOS transistor MN4 Connected to point D; the source of the N-type MOS tube MN3 is connected to the anode of the OLED, and the cathode
  • the data voltage Vdata does not change, and the anode voltage of the OLED does not change, and the current flowing through the OLED does not change.
  • the change of N only affects the on-time of the constant current flowing through the OLED.
  • the constant current is constant, the light-emitting characteristics of the OLED will not change.
  • the VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
  • a method for adjusting the brightness of a micro-display driving circuit which is characterized by: adopts PFM control mode, after the field synchronization signal becomes high, VPULSE generates N high pulses on average within a field time, and the pulse width is fixed.
  • the VPULSE pulse is MN2 is turned on during the high level time, the voltage at point C is equal to the V COM voltage, and after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage; the voltage at point C is zero, and the current Ioled flowing through the OLED is also cleared. , OLED from light-emitting to extinguishing, so that in the case of a fixed pulse width, by adjusting the pulse frequency to achieve precise adjustment of the brightness of the OLED light.
  • the invention and the novel micro-display pixel driving circuit include a driving tube, a switch tube, and a storage capacitor.
  • the VPLUSE signal is divided into N levels, which regulate the common cathode voltage VCOM or the power supply voltage VDD. Can achieve N-level brightness adjustment range.
  • the novel pixel driving circuit of the present invention adopts the number of pulses to adjust the common cathode voltage to realize brightness adjustment, and a wider linear brightness adjustment range can be obtained.
  • the number of VPULSE pulses is evenly distributed within one frame, and the frequency is relatively high. Each pixel can be continuously modulated within one frame, eliminating the flicker problem of common cathode display traditional constant frequency (usually frame rate) PWM brightness adjustment .
  • the invention adopts a switch tube to realize brightness adjustment, has a simple structure, can save area and has a large adjustable range.
  • the brightness adjustment method of the present invention is high, and each pixel can be continuously modulated within one frame time, eliminating the flicker problem of the display during the brightness adjustment process.
  • Fig. 1 is a circuit diagram of a conventional pixel.
  • Figure 2 is one of the pixel circuit diagrams of the present invention.
  • Fig. 3 is a lighting timing chart of the pixel circuit shown in Fig. 1.
  • Fig. 4 is the second circuit diagram of the pixel of the present invention.
  • a micro-display driving circuit that can improve the wide dynamic range and adjust the brightness.
  • the drain of the P-type MOS tube MP1 is connected to the positive terminal of the input voltage source Vdata, and the source of the P-type MOS tube MP1 is connected to one end of the capacitor C1, and the N-type MOS
  • the gate of the tube MN1 is connected.
  • the gate of the P-type MOS tube MP1 is connected to the external control signal SEL2.
  • the negative terminal of the voltage source Vdata and the other terminal of the capacitor C1 are connected to the ground GND.
  • the drain of the N-type MOS tube MN1 is connected to the voltage VDD, the source of the N-type MOS tube MN1 is connected to the anode of the OLED, and the cathode of the OLED is connected to the drain of the P-type MOS tube MP1 and the drain of the N-type MOS tube MN2.
  • the source of the P-type MOS tube MP1 is connected to the ground GND, the gate of the P-type MOS tube MP1 and the gate of the N-type MOS tube MN2 are connected to VPULSE, and the source of the N-type MOS tube MN2 is connected to Vcom.
  • the data voltage Vdata does not change, and the anode voltage of the OLED does not change, and the current flowing through the OLED does not change.
  • the change of N only affects the on-time of the constant current flowing through the OLED.
  • the constant current is constant, the light-emitting characteristics of the OLED will not change.
  • the VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
  • the switch tube MP1 When the row selection control signal SEL2 is at a low level, the switch tube MP1 is turned on, the driving signal data voltage Vdata is written into the storage capacitor C1, and the driving tube MN1 is turned on to drive the OLED to emit light.
  • the VPULSE signal is divided into N levels.
  • the pulse width is one line time.
  • MN2 is turned on during the high level time of VPULSE pulse, and the voltage at point C is equal to V COM voltage, after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage. The voltage at point C is zero, and the current Ioled flowing through the OLED is also cleared.
  • the OLED changes from emitting to extinguishing. This realizes the precise control of the light-emitting time of the OLED device, and realizes the brightness adjustment of the OLED light-emitting by controlling the light-emitting time.
  • VPULSE changes from 0 to N, the change of N only affects the time for the OLED to flow a constant current.
  • the constant current does not change, the OLED's light-emitting characteristics will not change.
  • the pixel circuit of the present invention can realize an N-level brightness adjustment range without affecting the light-emitting characteristics of the OLED.
  • the VPULSE pulse width is fixed, the pulse frequency is high, and the pulse frequency is evenly distributed within one frame time. Each pixel can be continuously modulated within one frame time, eliminating the flicker problem when the display is brightened by the traditional low-frequency PWM method.
  • a micro-display driving circuit that can improve the wide dynamic range and adjust the brightness.
  • the drain of the P-type MOS tube MP3 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP3 is connected to one end of the capacitor C2, and the N-type MOS
  • the gate of the tube MN3 is connected.
  • the gate of the P-type MOS tube MP3 is connected to the external control signal SEL3.
  • the negative terminal of the voltage source Vdata and the other terminal of the capacitor C2 are connected to the ground GND.
  • the drain of the N-type MOS transistor MN3, the drain of the P-type MOS transistor MP4 and the drain of the N-type MOS transistor MN4 are connected to point D.
  • the source of the N-type MOS tube MN3 is connected to the anode of the OLED, and the cathode of the OLED is connected to Vcom.
  • the source of the P-type MOS tube MP4 is connected to VDD, the gate of the P-type MOS tube MP4 and the gate of the N-type MOS tube MN4 are connected to VPULSE, and the source of the N-type MOS tube MN4 is connected to GND.
  • the VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is achieved by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
  • the switch tube MP3 When the row selection control signal SEL3 is at a low level, the switch tube MP3 is turned on, the driving signal data voltage Vdata is written into the storage capacitor C2, and the driving tube MN3 is turned on to drive the OLED to emit light.
  • the VPULSE signal is divided into N levels.
  • the pulse width is one line time. After the VPULSE pulse changes to low level, the voltage at point D is equal to the VDD voltage. When the VPULSE pulse is at a high level, MN4 is turned on, the voltage at point D is equal to the GND voltage, and the voltage at point D is zero, and the current Ioled flowing through the OLED is also cleared. Precise control of time. In the case of a fixed pulse width, the precise adjustment of the brightness of the OLED light can be achieved by adjusting the pulse frequency.
  • a method for adjusting the brightness of a micro display driving circuit using PFM control mode.
  • VPULSE After the field synchronization signal becomes high, VPULSE generates N high pulses on average in one field time, and the pulse width is fixed, and the VPULSE pulse is high level time
  • the internal MN2 is turned on, the voltage at point C is equal to the V COM voltage, and after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage; the voltage at point C is zero, and the current Ioled flowing through the OLED is also cleared, and the OLED glows from Until it goes out, so that under the condition of a fixed pulse width, the precise adjustment of the brightness of the OLED light can be achieved by adjusting the pulse frequency.
  • the present invention is not limited to the above-mentioned embodiments. Regardless of any changes in the realization form of the VPULSE signal, any structure that uses the number of VPULSE pulses to control the VCOM or VDD voltage of the common cathode OLED and realizes the brightness adjustment should fall under the protection of the present invention. Within range.

Abstract

Disclosed are a micro-display driving circuit capable of improving wide-dynamic-range brightness adjustment, and a brightness adjustment method. The micro-display driving circuit comprises a driving tube MN1, a switch tube MP1, a switch tube MP2, a switch tube MN2 and a storage capacitor C1. When VPULSE changes from 0 to N, a data voltage Vdata does not change, the anode voltage of an OLED does not change, a current flowing through the OLED does not change, and the change of N only affects the conduction time of the constant current flowing through the OLED. When the constant current does not change, a light emission characteristic of the OLED does not change, the pulse width of VPULSE is constant, and the conduction time of the constant current is modulated by means of adjusting a pulse frequency. Therefore, a pixel circuit can realize an N-level brightness adjustment range without affecting a light emission characteristic of an OLED, and does not generate a screen flash phenomenon caused by an insufficient refresh frequency during traditional PWM brightness adjustment.

Description

一种能提高宽动态范围调亮的微显示驱动电路及调亮方法A micro-display driving circuit capable of improving wide dynamic range and brightness adjustment and brightness adjustment method 技术领域Technical field
本发明涉及一种用于硅基微显示驱动电路调亮方法，属于微电子及显示技术领域。The invention relates to a method for adjusting the brightness of a silicon-based micro-display driving circuit, which belongs to the field of microelectronics and display technology.
背景技术Background technique
微显示是显示技术领域的一个分支，它实现了显示技术与硅基集成电路技术的结合。根据发光原理不同，现有的微型显示器主要有：CRT微显示器、数字微镜器件(Digital Mirror Device，DMD)、LCD微显示器、硅基液晶(Liquid Crystal onSilicon，LCoS)微显示器、硅基有机发光二极管(Organic Light Emitting Diode onSilicon，OLED-on-Silicon)微显示器、LED微显示器等。其中像素电路直接驱动OLED、LED发光，所以像素电路结构决定了OLED、LED发光的亮度、对比度等。在恒压驱动模式下，OLED、LED发光亮度随驱动电流的增大而升高，可以直接通过改变公共阴极电压的大小来调节显示器的亮度，如图1所示，它由虚线框内具体像素电路1、外接电压源Vdata、外接OLED构成。P型MOS管MP的漏极与输入电压源Vdata正向端相连，P型MOS管MP的源极与电容C的一端、N型MOS管MN的栅极相连。P型MOS管MP的栅极与行选控制信号SEL1相连。电压源Vdata负向端、电容C的另一端与地GND相连。N型MOS管MN的漏极与电压VDD相连，N型MOS管MN的源极与OLED阳极相连。OLED的阴极与Vcom电压相连；其工作过程是：行选控制信号SEL1为低电平时，开关管MP导通，驱动信号数据Vdata写入存储电容C中，驱动管MN导通，驱动OLED发光，驱动电流与Vdata对应，对像素进行亮度调节。SEL1为高电平时，开关管MP关断，Vdata已经存储在C中，MN仍处于导通阶段，驱动电流保持不变。当Vdata不变时，即同一灰阶时，可以通过调节OLED的阴极电压VCOM的大小来调节OLED发光的亮度，VCOM的绝对值越大，OLED两端的压差越大，流过OLED的电流越大，发光亮度越高。这种方法不能以合适的均匀性来获得较宽动态范围的调光。同时改变公共阴极电压VCOM的大小会导致OLED、LED发光的伽马(GAMMA)特性的改变，影响显示效果。Micro display is a branch of the display technology field, which realizes the combination of display technology and silicon-based integrated circuit technology. According to different light-emitting principles, the existing micro-displays mainly include: CRT micro-display, Digital Mirror Device (DMD), LCD micro-display, Liquid Crystal on Silicon (LCoS) micro-display, silicon-based organic light-emitting Diode (Organic Light Emitting Diode on Silicon, OLED-on-Silicon) micro display, LED micro display, etc. Among them, the pixel circuit directly drives the OLED and LED to emit light, so the pixel circuit structure determines the brightness and contrast of the OLED and LED. In the constant voltage driving mode, the luminous brightness of OLED and LED increases with the increase of the driving current. The brightness of the display can be adjusted directly by changing the size of the common cathode voltage. As shown in Figure 1, it is represented by the specific pixels in the dotted frame Circuit 1. An external voltage source Vdata and an external OLED are formed. The drain of the P-type MOS tube MP is connected to the positive terminal of the input voltage source Vdata, and the source of the P-type MOS tube MP is connected with one end of the capacitor C and the gate of the N-type MOS tube MN. The gate of the P-type MOS tube MP is connected to the row selection control signal SEL1. The negative terminal of the voltage source Vdata and the other terminal of the capacitor C are connected to the ground GND. The drain of the N-type MOS tube MN is connected to the voltage VDD, and the source of the N-type MOS tube MN is connected to the anode of the OLED. The cathode of the OLED is connected to the Vcom voltage; its working process is: when the row selection control signal SEL1 is low, the switch tube MP is turned on, the driving signal data Vdata is written into the storage capacitor C, and the driving tube MN is turned on to drive the OLED to emit light. The drive current corresponds to Vdata and adjusts the brightness of the pixel. When SEL1 is at a high level, the switching tube MP is turned off, Vdata has been stored in C, MN is still in the on phase, and the drive current remains unchanged. When Vdata does not change, that is, at the same gray scale, the brightness of the OLED can be adjusted by adjusting the size of the OLED cathode voltage VCOM. The greater the absolute value of VCOM, the greater the voltage difference across the OLED and the greater the current flowing through the OLED. Larger, the higher the luminous brightness. This method cannot achieve wide dynamic range dimming with suitable uniformity. At the same time, changing the size of the common cathode voltage VCOM will cause the gamma (GAMMA) characteristics of the OLED and LED to change, which will affect the display effect.
发明内容Summary of the invention
本发明的目的是针对现有的亮度调节电路存在不能以合适的均匀性来获得较宽动态范围的调光的问题，设计一种能提高宽动态范围调亮的微显示驱动电路，同时提供相应的调亮方法。通过PFM(Pulse Frequency Modulation)模式采用脉冲数对公共阴极电压进行调节实现调亮，可以使微显示器在整个调亮范围内维持灰阶和色度的一致性。The purpose of the present invention is to solve the problem that the existing brightness adjustment circuit cannot obtain a wide dynamic range dimming with suitable uniformity, and to design a micro display driving circuit that can improve the wide dynamic range brightness adjustment, and provide corresponding The brightness adjustment method. Through the PFM (Pulse Frequency Modulation) mode, the number of pulses is used to adjust the common cathode voltage to achieve brightness adjustment, so that the microdisplay can maintain the consistency of grayscale and chromaticity in the entire brightness range.
本发明目的技术方案之一是：One of the technical solutions of the present invention is:
一种能提高宽动态范围调亮的微显示驱动电路，它包括P型MOS管MP1、P型MOS管MP2、电容C1、N型MOS管MN1和N型MOS管MN2，其特征是所述的P型MOS 管MP1的漏极与输入电压源Vdata正向端相连，P型MOS管MP1的源极与电容C1的一端、N型MOS管MN1的栅极相连；P型MOS管MP1的栅极与外接控制信号SEL2相连；电压源Vdata负向端、电容C1的另一端与地GND相连；N型MOS管MN1的漏极与电压VDD相连，N型MOS管MN1的源极与OLED阳极相连，OLED的阴极与P型MOS管MP2的漏极、N型MOS管MN2的漏极相连；P型MOS管MP2的源极与地GND相连，P型MOS管MP2的栅极、N型MOS管MN2的栅极与VPULSE相连，N型MOS管MN2的源极与Vcom相连。当VPULSE从0到N变化时，数据电压Vdata不变，则OLED阳极电压不变，流过OLED的电流不会变化，N的变化只是影响了流过OLED的恒定电流的导通时间。恒定电流不变，OLED的发光特性就不会变化，本发明VPULSE脉冲宽度恒定，通过调整脉冲频率来实现对恒定电流导通时间的调制。因此，本发明的像素电路可以在不影响OLED发光特性的情况下，可以实现N级别的调亮范围，且不会产生传统PWM调亮时由于刷新频率不够导致的屏闪现象。A micro-display driving circuit capable of improving wide dynamic range and brightness adjustment. It includes a P-type MOS tube MP1, a P-type MOS tube MP2, a capacitor C1, an N-type MOS tube MN1 and an N-type MOS tube MN2. The drain of the P-type MOS tube MP1 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP1 is connected to one end of the capacitor C1 and the gate of the N-type MOS tube MN1; the gate of the P-type MOS tube MP1 Connect to the external control signal SEL2; the negative terminal of the voltage source Vdata and the other end of the capacitor C1 are connected to the ground GND; the drain of the N-type MOS tube MN1 is connected to the voltage VDD, and the source of the N-type MOS tube MN1 is connected to the anode of the OLED, The cathode of the OLED is connected to the drain of the P-type MOS tube MP2 and the drain of the N-type MOS tube MN2; the source of the P-type MOS tube MP2 is connected to the ground GND, and the gate of the P-type MOS tube MP2 is connected to the N-type MOS tube MN2. The gate of N is connected to VPULSE, and the source of N-type MOS transistor MN2 is connected to Vcom. When VPULSE changes from 0 to N, the data voltage Vdata does not change, and the anode voltage of the OLED does not change, and the current flowing through the OLED does not change. The change of N only affects the on-time of the constant current flowing through the OLED. When the constant current is constant, the light-emitting characteristics of the OLED will not change. The VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
本发明目的技术方案之二是：The second technical solution of the present invention is:
一种能提高宽动态范围调亮的微显示驱动电路，它包括P型MOS管MP3、P型MOS管MP4、电容C2、N型MOS管MN3和N型MOS管MN4，其特征是所述的P型MOS管MP3的漏极与输入电压源Vdata正向端相连，P型MOS管MP3的源极与电容C2的一端、N型MOS管MN3的栅极相连；P型MOS管MP3的栅极与外接控制信号SEL3相连；电压源Vdata负向端、电容C2的另一端与地GND相连；N型MOS管MN3的漏极与P型MOS管MP4的漏极、N型MOS管MN4的漏极相连于D点；N型MOS管MN3的源极与OLED阳极相连，OLED的阴极与Vcom相连；P型MOS管MP4的源极与VDD相连，P型MOS管MP4的栅极、N型MOS管MN4的栅极与VPULSE相连，N型MOS管MN4的源极与GND相连。当VPULSE从0到N变化时，数据电压Vdata不变，则OLED阳极电压不变，流过OLED的电流不会变化，N的变化只是影响了流过OLED的恒定电流的导通时间。恒定电流不变，OLED的发光特性就不会变化，本发明VPULSE脉冲宽度恒定，通过调整脉冲频率来实现对恒定电流导通时间的调制。因此，本发明的像素电路可以在不影响OLED发光特性的情况下，可以实现N级别的调亮范围，且不会产生传统PWM调亮时由于刷新频率不够导致的屏闪现象。A micro-display driving circuit capable of improving wide dynamic range and brightness adjustment. It includes P-type MOS tube MP3, P-type MOS tube MP4, capacitor C2, N-type MOS tube MN3 and N-type MOS tube MN4, and is characterized by the The drain of the P-type MOS tube MP3 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP3 is connected to one end of the capacitor C2 and the gate of the N-type MOS tube MN3; the gate of the P-type MOS tube MP3 Connected to the external control signal SEL3; the negative terminal of the voltage source Vdata and the other end of the capacitor C2 are connected to the ground GND; the drain of the N-type MOS transistor MN3 and the drain of the P-type MOS transistor MP4 and the drain of the N-type MOS transistor MN4 Connected to point D; the source of the N-type MOS tube MN3 is connected to the anode of the OLED, and the cathode of the OLED is connected to Vcom; the source of the P-type MOS tube MP4 is connected to VDD, the gate of the P-type MOS tube MP4, and the N-type MOS tube The gate of MN4 is connected to VPULSE, and the source of the N-type MOS transistor MN4 is connected to GND. When VPULSE changes from 0 to N, the data voltage Vdata does not change, and the anode voltage of the OLED does not change, and the current flowing through the OLED does not change. The change of N only affects the on-time of the constant current flowing through the OLED. When the constant current is constant, the light-emitting characteristics of the OLED will not change. The VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
本发明目的技术方案之三是：The third technical solution of the present invention is:
一种微显示驱动电路的调亮方法，其特征是：采用PFM控制方式，场同步信号变为高电平后，VPULSE一场时间内平均产生N个高脉冲，且脉冲宽度固定，VPULSE脉冲为高电平时间内MN2导通，C点电压等于V COM电压，VPULSE脉冲变为低电平后，C点电压等于 GND电压；C点电压为零，流过OLED的电流Ioled也随之清零，OLED从发光到熄灭，这样就在脉冲宽度固定的情况下，通过调整脉冲频率实现对OLED发光的亮度的精确调节。 A method for adjusting the brightness of a micro-display driving circuit, which is characterized by: adopts PFM control mode, after the field synchronization signal becomes high, VPULSE generates N high pulses on average within a field time, and the pulse width is fixed. The VPULSE pulse is MN2 is turned on during the high level time, the voltage at point C is equal to the V COM voltage, and after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage; the voltage at point C is zero, and the current Ioled flowing through the OLED is also cleared. , OLED from light-emitting to extinguishing, so that in the case of a fixed pulse width, by adjusting the pulse frequency to achieve precise adjustment of the brightness of the OLED light.
本发明和新型的微显示像素驱动电路，包括驱动管、开关管、存储电容。VPLUSE信号分为N级，对公共阴极电压VCOM或电源电压VDD进行调节。可以实现N级别的调亮范围。The invention and the novel micro-display pixel driving circuit include a driving tube, a switch tube, and a storage capacitor. The VPLUSE signal is divided into N levels, which regulate the common cathode voltage VCOM or the power supply voltage VDD. Can achieve N-level brightness adjustment range.
本发明的优点及显著效果：The advantages and significant effects of the present invention:
1.本发明新型像素驱动电路采用脉冲数对公共阴极电压进行调节实现调亮，可以得到较宽的线性调亮范围。1. The novel pixel driving circuit of the present invention adopts the number of pulses to adjust the common cathode voltage to realize brightness adjustment, and a wider linear brightness adjustment range can be obtained.
2.VPULSE脉冲数在一帧时间内平均分布，频率较高，可以在一帧时间内连续调制每个像素，消除了公共阴极显示器传统恒定频率(一般为帧频)PWM调亮时的闪烁问题。2. The number of VPULSE pulses is evenly distributed within one frame, and the frequency is relatively high. Each pixel can be continuously modulated within one frame, eliminating the flicker problem of common cathode display traditional constant frequency (usually frame rate) PWM brightness adjustment .
3.本发明采用开关管实现调亮，结构简单，能够节省面积、可调范围大。3. The invention adopts a switch tube to realize brightness adjustment, has a simple structure, can save area and has a large adjustable range.
4.本发明的调亮方法。频率较高，可以在一帧时间内连续调制每个像素，消除了显示器在调亮过程中的闪烁问题。4. The brightness adjustment method of the present invention. The frequency is high, and each pixel can be continuously modulated within one frame time, eliminating the flicker problem of the display during the brightness adjustment process.
附图说明Description of the drawings
图1是现有的像素电路图。Fig. 1 is a circuit diagram of a conventional pixel.
图2是本发明像素电路图之一。Figure 2 is one of the pixel circuit diagrams of the present invention.
图3是图1所示像素电路的点亮时序图。Fig. 3 is a lighting timing chart of the pixel circuit shown in Fig. 1.
图4是本发明的像素电路图之二。Fig. 4 is the second circuit diagram of the pixel of the present invention.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明进行详细说明。The present invention will be described in detail below with reference to the drawings and specific embodiments.
实施例一。Example one.
如图2所示。as shown in picture 2.
一种能提高宽动态范围调亮的微显示驱动电路，P型MOS管MP1的漏极与输入电压源Vdata正向端相连，P型MOS管MP1的源极与电容C1的一端、N型MOS管MN1的栅极相连。P型MOS管MP1的栅极与外接控制信号SEL2相连。电压源Vdata负向端、电容C1的另一端与地GND相连。N型MOS管MN1的漏极与电压VDD相连，N型MOS管MN1的源极与OLED阳极相连，OLED的阴极与P型MOS管MP1的漏极、N型MOS管MN2的漏极相连。P型MOS管MP1的源极与地GND相连，P型MOS管MP1的栅极、N型MOS管MN2的栅极与VPULSE相连，N型MOS管MN2的源极与Vcom相连。当VPULSE从0到N变化时，数据电压Vdata不变，则OLED阳极电压不变，流过OLED 的电流不会变化，N的变化只是影响了流过OLED的恒定电流的导通时间。恒定电流不变，OLED的发光特性就不会变化，本发明VPULSE脉冲宽度恒定，通过调整脉冲频率来实现对恒定电流导通时间的调制。因此，本发明的像素电路可以在不影响OLED发光特性的情况下，可以实现N级别的调亮范围，且不会产生传统PWM调亮时由于刷新频率不够导致的屏闪现象。A micro-display driving circuit that can improve the wide dynamic range and adjust the brightness. The drain of the P-type MOS tube MP1 is connected to the positive terminal of the input voltage source Vdata, and the source of the P-type MOS tube MP1 is connected to one end of the capacitor C1, and the N-type MOS The gate of the tube MN1 is connected. The gate of the P-type MOS tube MP1 is connected to the external control signal SEL2. The negative terminal of the voltage source Vdata and the other terminal of the capacitor C1 are connected to the ground GND. The drain of the N-type MOS tube MN1 is connected to the voltage VDD, the source of the N-type MOS tube MN1 is connected to the anode of the OLED, and the cathode of the OLED is connected to the drain of the P-type MOS tube MP1 and the drain of the N-type MOS tube MN2. The source of the P-type MOS tube MP1 is connected to the ground GND, the gate of the P-type MOS tube MP1 and the gate of the N-type MOS tube MN2 are connected to VPULSE, and the source of the N-type MOS tube MN2 is connected to Vcom. When VPULSE changes from 0 to N, the data voltage Vdata does not change, and the anode voltage of the OLED does not change, and the current flowing through the OLED does not change. The change of N only affects the on-time of the constant current flowing through the OLED. When the constant current is constant, the light-emitting characteristics of the OLED will not change. The VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
图2所示电路的工作过程如下：The working process of the circuit shown in Figure 2 is as follows:
行选控制信号SEL2为低电平时，开关管MP1导通，驱动信号数据电压Vdata写入存储电容C1中，驱动管MN1导通，驱动OLED发光。VPULSE信号分为N级，当VPULSE＝1时，场同步信号变为高电平后，VPULSE立刻产生一个高脉冲，脉冲宽度为一行时间，一行时间内MN2导通，C点电压等于V COM电压，VPULSE脉冲变为低电平后，C点电压等于GND电压。当VPULSE＝N时，场同步信号变为高电平后，VPULSE一场时间内平均产生N个高脉冲，脉冲宽度为一行时间，VPULSE脉冲为高电平时间内MN2导通，C点电压等于V COM电压，VPULSE脉冲变为低电平后，C点电压等于GND电压。C点电压为零，流过OLED的电流Ioled也随之清零，OLED从发光到熄灭，这样就实现了OLED器件发光时间的精确控制，通过控制发光时间实现了OLED发光的亮度调节。当VPULSE从0到N变化时，N的变化只是影响了OLED流过恒定电流的时间。恒定电流不变，OLED的发光特性就不会变化。本发明的像素电路可以在不影响OLED发光特性的情况下，可以实现N级别的调亮范围。而且VPULSE脉冲宽度固定，脉冲频率较高，且在一帧时间内平均分布，可以在一帧时间内连续调制每个像素，消除了显示器用传统低频PWM方式调亮时的闪烁问题。 When the row selection control signal SEL2 is at a low level, the switch tube MP1 is turned on, the driving signal data voltage Vdata is written into the storage capacitor C1, and the driving tube MN1 is turned on to drive the OLED to emit light. The VPULSE signal is divided into N levels. When VPULSE=1, after the field synchronization signal becomes high, VPULSE immediately generates a high pulse, the pulse width is one line time, MN2 is turned on during one line time, and the voltage at point C is equal to the V COM voltage After the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage. When VPULSE=N, after the field synchronization signal becomes high level, VPULSE generates N high pulses on average within one field time. The pulse width is one line time. MN2 is turned on during the high level time of VPULSE pulse, and the voltage at point C is equal to V COM voltage, after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage. The voltage at point C is zero, and the current Ioled flowing through the OLED is also cleared. The OLED changes from emitting to extinguishing. This realizes the precise control of the light-emitting time of the OLED device, and realizes the brightness adjustment of the OLED light-emitting by controlling the light-emitting time. When VPULSE changes from 0 to N, the change of N only affects the time for the OLED to flow a constant current. The constant current does not change, the OLED's light-emitting characteristics will not change. The pixel circuit of the present invention can realize an N-level brightness adjustment range without affecting the light-emitting characteristics of the OLED. In addition, the VPULSE pulse width is fixed, the pulse frequency is high, and the pulse frequency is evenly distributed within one frame time. Each pixel can be continuously modulated within one frame time, eliminating the flicker problem when the display is brightened by the traditional low-frequency PWM method.
实施例二。实施例二。 Example two.
如图4所示。As shown in Figure 4.
一种能提高宽动态范围调亮的微显示驱动电路，P型MOS管MP3的漏极与输入电压源Vdata正向端相连，P型MOS管MP3的源极与电容C2的一端、N型MOS管MN3的栅极相连。P型MOS管MP3的栅极与外接控制信号SEL3相连。电压源Vdata负向端、电容C2的另一端与地GND相连。N型MOS管MN3的漏极与P型MOS管MP4的漏极、N型MOS管MN4的漏极相连于D点。N型MOS管MN3的源极与OLED阳极相连，OLED的阴极与Vcom相连。P型MOS管MP4的源极与VDD相连，P型MOS管MP4的栅极、N型MOS管MN4的栅极与VPULSE相连，N型MOS管MN4的源极与GND相连。当VPULSE从0到N变化时，数据电压Vdata不变，则OLED阳极电压不变，流过OLED的电流不会变化，N的变化只是影响了流过OLED的恒定电流的导通时间。恒定电流不变，OLED的发光特性就不会变化，本发明VPULSE脉冲宽度恒定，通过调整脉冲频率来实现 对恒定电流导通时间的调制。因此，本发明的像素电路可以在不影响OLED发光特性的情况下，可以实现N级别的调亮范围，且不会产生传统PWM调亮时由于刷新频率不够导致的屏闪现象。A micro-display driving circuit that can improve the wide dynamic range and adjust the brightness. The drain of the P-type MOS tube MP3 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP3 is connected to one end of the capacitor C2, and the N-type MOS The gate of the tube MN3 is connected. The gate of the P-type MOS tube MP3 is connected to the external control signal SEL3. The negative terminal of the voltage source Vdata and the other terminal of the capacitor C2 are connected to the ground GND. The drain of the N-type MOS transistor MN3, the drain of the P-type MOS transistor MP4 and the drain of the N-type MOS transistor MN4 are connected to point D. The source of the N-type MOS tube MN3 is connected to the anode of the OLED, and the cathode of the OLED is connected to Vcom. The source of the P-type MOS tube MP4 is connected to VDD, the gate of the P-type MOS tube MP4 and the gate of the N-type MOS tube MN4 are connected to VPULSE, and the source of the N-type MOS tube MN4 is connected to GND. When VPULSE changes from 0 to N, the data voltage Vdata does not change, and the anode voltage of the OLED does not change, and the current flowing through the OLED does not change. The change of N only affects the on-time of the constant current flowing through the OLED. If the constant current is constant, the light-emitting characteristics of the OLED will not change. The VPULSE pulse width of the present invention is constant, and the modulation of the constant current conduction time is achieved by adjusting the pulse frequency. Therefore, the pixel circuit of the present invention can realize the brightness adjustment range of N level without affecting the light-emitting characteristics of the OLED, and does not cause the screen flicker phenomenon caused by the insufficient refresh frequency during the traditional PWM brightness adjustment.
图4所示电路的工作过程如下：The working process of the circuit shown in Figure 4 is as follows:
行选控制信号SEL3为低电平时，开关管MP3导通，驱动信号数据电压Vdata写入存储电容C2中，驱动管MN3导通，驱动OLED发光。VPULSE信号分为N级，当VPULSE＝1时，场同步信号变为高电平后，VPULSE立刻产生一个高脉冲，脉冲宽度为一行时间，一行时间内MN4导通，D点电压等于GND电压，VPULSE脉冲变为低电平后，D点电压等于VDD电压。当VPULSE＝N时，场同步信号变为高电平后，VPULSE一场时间内平均产生N个高脉冲，脉冲宽度为一行时间，VPULSE脉冲变为低电平后，D点电压等于VDD电压。VPULSE脉冲为高电平时间内MN4导通，D点电压等于GND电压，D点电压为零，流过OLED的电流Ioled也随之清零，OLED从发光到熄灭，这样就实现了OLED器件发光时间的精确控制。在脉冲宽度固定的情况下，通过调整脉冲频率实现对OLED发光的亮度的精确调节。When the row selection control signal SEL3 is at a low level, the switch tube MP3 is turned on, the driving signal data voltage Vdata is written into the storage capacitor C2, and the driving tube MN3 is turned on to drive the OLED to emit light. The VPULSE signal is divided into N levels. When VPULSE=1, after the field synchronization signal becomes high, VPULSE immediately generates a high pulse, the pulse width is one line time, MN4 is turned on during one line, and the voltage at point D is equal to the GND voltage. After the VPULSE pulse becomes low, the voltage at point D is equal to the VDD voltage. When VPULSE=N, after the field synchronization signal changes to high level, VPULSE generates N high pulses on average within one field time. The pulse width is one line time. After the VPULSE pulse changes to low level, the voltage at point D is equal to the VDD voltage. When the VPULSE pulse is at a high level, MN4 is turned on, the voltage at point D is equal to the GND voltage, and the voltage at point D is zero, and the current Ioled flowing through the OLED is also cleared. Precise control of time. In the case of a fixed pulse width, the precise adjustment of the brightness of the OLED light can be achieved by adjusting the pulse frequency.
实施例三。Example three.
如图3所示。As shown in Figure 3.
一种微显示驱动电路的调亮方法，采用PFM控制方式，场同步信号变为高电平后，VPULSE一场时间内平均产生N个高脉冲，且脉冲宽度固定，VPULSE脉冲为高电平时间内MN2导通，C点电压等于V COM电压，VPULSE脉冲变为低电平后，C点电压等于GND电压；C点电压为零，流过OLED的电流Ioled也随之清零，OLED从发光到熄灭，这样就在脉冲宽度固定的情况下，通过调整脉冲频率实现对OLED发光的亮度的精确调节。 A method for adjusting the brightness of a micro display driving circuit, using PFM control mode. After the field synchronization signal becomes high, VPULSE generates N high pulses on average in one field time, and the pulse width is fixed, and the VPULSE pulse is high level time The internal MN2 is turned on, the voltage at point C is equal to the V COM voltage, and after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage; the voltage at point C is zero, and the current Ioled flowing through the OLED is also cleared, and the OLED glows from Until it goes out, so that under the condition of a fixed pulse width, the precise adjustment of the brightness of the OLED light can be achieved by adjusting the pulse frequency.
本发明不局限于上述实施方式，不论VPULSE信号其实现形式作任何变化，凡是采用VPULSE脉冲个数来控制公共阴极OLED的VCOM或VDD电压，实现了亮度调节的结构，均应落在本发明保护范围之内。The present invention is not limited to the above-mentioned embodiments. Regardless of any changes in the realization form of the VPULSE signal, any structure that uses the number of VPULSE pulses to control the VCOM or VDD voltage of the common cathode OLED and realizes the brightness adjustment should fall under the protection of the present invention. Within range.
本发明未涉及部分与现有技术相同或可采用现有技术加以实现。The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims (3)

  1. 一种能提高宽动态范围调亮的微显示驱动电路，它包括P型MOS管MP1、P型MOS管MP2、电容C1、N型MOS管MN1和N型MOS管MN2，其特征是所述的P型MOS管MP1的漏极与输入电压源Vdata正向端相连，P型MOS管MP1的源极与电容C1的一端、N型MOS管MN1的栅极相连；P型MOS管MP1的栅极与外接控制信号SEL2相连；电压源Vdata负向端、电容C1的另一端与地GND相连；N型MOS管MN1的漏极与电压VDD相连，N型MOS管MN1的源极与OLED阳极相连，OLED的阴极与P型MOS管MP2的漏极、N型MOS管MN2的漏极相连；P型MOS管MP2的源极与地GND相连，P型MOS管MP2的栅极、N型MOS管MN2的栅极与VPULSE相连，N型MOS管MN2的源极与Vcom相连。A micro-display driving circuit capable of improving wide dynamic range and brightness adjustment. It includes a P-type MOS tube MP1, a P-type MOS tube MP2, a capacitor C1, an N-type MOS tube MN1 and an N-type MOS tube MN2. The drain of the P-type MOS tube MP1 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP1 is connected to one end of the capacitor C1 and the gate of the N-type MOS tube MN1; the gate of the P-type MOS tube MP1 Connect to the external control signal SEL2; the negative terminal of the voltage source Vdata and the other end of the capacitor C1 are connected to the ground GND; the drain of the N-type MOS tube MN1 is connected to the voltage VDD, and the source of the N-type MOS tube MN1 is connected to the anode of the OLED, The cathode of the OLED is connected to the drain of the P-type MOS tube MP2 and the drain of the N-type MOS tube MN2; the source of the P-type MOS tube MP2 is connected to the ground GND, and the gate of the P-type MOS tube MP2 is connected to the N-type MOS tube MN2. The gate of N is connected to VPULSE, and the source of N-type MOS transistor MN2 is connected to Vcom.
  2. 一种能提高宽动态范围调亮的微显示驱动电路，它包括P型MOS管MP3、P型MOS管MP4、电容C2、N型MOS管MN3和N型MOS管MN4，其特征是所述的P型MOS管MP3的漏极与输入电压源Vdata正向端相连，P型MOS管MP3的源极与电容C2的一端、N型MOS管MN3的栅极相连；P型MOS管MP3的栅极与外接控制信号SEL3相连；电压源Vdata负向端、电容C2的另一端与地GND相连；N型MOS管MN3的漏极与P型MOS管MP4的漏极、N型MOS管MN4的漏极相连于D点；N型MOS管MN3的源极与OLED阳极相连，OLED的阴极与Vcom相连；P型MOS管MP4的源极与VDD相连，P型MOS管MP4的栅极、N型MOS管MN4的栅极与VPULSE相连，N型MOS管MN4的源极与GND相连。A micro-display driving circuit capable of improving wide dynamic range and brightness adjustment. It includes P-type MOS tube MP3, P-type MOS tube MP4, capacitor C2, N-type MOS tube MN3 and N-type MOS tube MN4, and is characterized by the The drain of the P-type MOS tube MP3 is connected to the positive terminal of the input voltage source Vdata, the source of the P-type MOS tube MP3 is connected to one end of the capacitor C2 and the gate of the N-type MOS tube MN3; the gate of the P-type MOS tube MP3 Connected to the external control signal SEL3; the negative terminal of the voltage source Vdata and the other end of the capacitor C2 are connected to the ground GND; the drain of the N-type MOS transistor MN3 and the drain of the P-type MOS transistor MP4 and the drain of the N-type MOS transistor MN4 Connected to point D; the source of the N-type MOS tube MN3 is connected to the anode of the OLED, and the cathode of the OLED is connected to Vcom; the source of the P-type MOS tube MP4 is connected to VDD, the gate of the P-type MOS tube MP4, and the N-type MOS tube The gate of MN4 is connected to VPULSE, and the source of the N-type MOS transistor MN4 is connected to GND.
  3. 一种基于权利要求1或2所述的微显示驱动电路的调亮方法，其特征是：采用PFM控制方式，场同步信号变为高电平后，VPULSE一场时间内平均产生N个高脉冲，且脉冲宽度固定，VPULSE脉冲为高电平时间内MN2导通，C点电压等于V COM电压，VPULSE脉冲变为低电平后，C点电压等于GND电压；C点电压为零，流过OLED的电流Ioled也随之清零，OLED从发光到熄灭，这样就在脉冲宽度固定的情况下，通过调整脉冲频率实现对OLED发光的亮度的精确调节。 A brightness adjustment method based on the micro-display driving circuit of claim 1 or 2, characterized in that: PFM control mode is adopted, after the field synchronization signal becomes high level, VPULSE generates N high pulses on average within one field time , And the pulse width is fixed, MN2 is turned on when the VPULSE pulse is high level, the voltage at point C is equal to the V COM voltage, after the VPULSE pulse becomes low, the voltage at point C is equal to the GND voltage; the voltage at point C is zero, and the The current Ioled of the OLED is also cleared accordingly, and the OLED changes from light-emitting to extinguishing. In this way, under the condition of a fixed pulse width, the precise adjustment of the brightness of the OLED light can be achieved by adjusting the pulse frequency.
PCT/CN2020/087896 2019-10-09 2020-04-29 Micro-display driving circuit capable of improving wide-dynamic-range brightness adjustment, and brightness adjustment method WO2021068492A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110675806A (en) * 2019-10-09 2020-01-10 南京国兆光电科技有限公司 Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method
CN111554239A (en) * 2020-05-22 2020-08-18 Tcl华星光电技术有限公司 Backlight control method, device and storage medium
CN113327539A (en) * 2021-05-19 2021-08-31 Tcl华星光电技术有限公司 Drive circuit, display panel and electronic device
CN114822394B (en) * 2022-05-05 2023-06-30 武汉天马微电子有限公司 Dimming method, device and equipment of display panel and computer readable storage medium
CN115083340A (en) * 2022-08-19 2022-09-20 南京芯视元电子有限公司 Micro display chip driving device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018173244A1 (en) * 2017-03-24 2018-09-27 シャープ株式会社 Display device and method for driving pixel circuit of display device
CN109686318A (en) * 2019-02-27 2019-04-26 深圳吉迪思电子科技有限公司 Pixel-driving circuit and driving method
CN109697960A (en) * 2019-02-27 2019-04-30 深圳吉迪思电子科技有限公司 Pixel-driving circuit and driving method, display panel
CN110675806A (en) * 2019-10-09 2020-01-10 南京国兆光电科技有限公司 Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method
CN110706652A (en) * 2019-10-09 2020-01-17 南京国兆光电科技有限公司 Common anode micro-display pixel driving circuit and driving method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7071932B2 (en) * 2001-11-20 2006-07-04 Toppoly Optoelectronics Corporation Data voltage current drive amoled pixel circuit
US20060164345A1 (en) * 2005-01-26 2006-07-27 Honeywell International Inc. Active matrix organic light emitting diode display
CN100508389C (en) * 2005-08-08 2009-07-01 晶豪科技股份有限公司 Pulse generator and pulse generating method
US8059114B2 (en) * 2007-11-14 2011-11-15 Infineon Technologies Ag Organic light emitting diode driver
FR2966276B1 (en) * 2010-10-15 2013-03-08 Commissariat Energie Atomique ACTIVE MATRIX LIGHT-EMITTING DIODE DISPLAY SCREEN WITH MEANS OF MITIGATION
CN107068059B (en) * 2017-05-27 2019-10-08 北京大学深圳研究生院 Pixel arrangement, the method for driving pixel arrangement and display equipment
TWI683434B (en) * 2018-09-21 2020-01-21 友達光電股份有限公司 Pixel structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018173244A1 (en) * 2017-03-24 2018-09-27 シャープ株式会社 Display device and method for driving pixel circuit of display device
CN109686318A (en) * 2019-02-27 2019-04-26 深圳吉迪思电子科技有限公司 Pixel-driving circuit and driving method
CN109697960A (en) * 2019-02-27 2019-04-30 深圳吉迪思电子科技有限公司 Pixel-driving circuit and driving method, display panel
CN110675806A (en) * 2019-10-09 2020-01-10 南京国兆光电科技有限公司 Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method
CN110706652A (en) * 2019-10-09 2020-01-17 南京国兆光电科技有限公司 Common anode micro-display pixel driving circuit and driving method

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