CN110675806A - Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method - Google Patents
Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method Download PDFInfo
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- CN110675806A CN110675806A CN201910955806.9A CN201910955806A CN110675806A CN 110675806 A CN110675806 A CN 110675806A CN 201910955806 A CN201910955806 A CN 201910955806A CN 110675806 A CN110675806 A CN 110675806A
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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
- 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
Abstract
A micro-display drive circuit capable of improving wide dynamic range brightness and a brightness adjusting method are characterized in that the micro-display drive circuit comprises a drive tube MN1, a switch tube MP1, a switch tube MP2, a switch tube MN2 and a storage capacitor C1. When VPULSE is changed from 0 to N, the data voltage Vdata is not changed, the anode voltage of the OLED is not changed, the current flowing through the OLED is not changed, and the change of N only influences the conduction time of the constant current flowing through the OLED. The constant current is not changed, the light emitting characteristic of the OLED cannot be changed, the VPULSE pulse width is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit can realize the dimming range of N level without influencing the light-emitting characteristic of the OLED, and can not generate the screen flash phenomenon caused by insufficient refresh frequency in the traditional PWM dimming.
Description
Technical Field
The invention relates to a method for adjusting brightness of a silicon-based micro-display driving circuit, and belongs to the technical field of microelectronics and display.
Background
Micro-displays are a branch of the display technology field, which enables the integration of display technology with silicon-based integrated circuit technology. According to the principle of light emission, the existing microdisplays mainly have: CRT micro-display, digital micro-mirror Device (DMD), LCD micro-display, Liquid Crystal on Silicon (LCoS) micro-display, Organic Light Emitting Diode (OLED-on-Silicon) micro-display, LED micro-display, and the like. The pixel circuit directly drives the OLED and the LED to emit light, so that the structure of the pixel circuit determines the brightness, the contrast and the like of the light emitted by the OLED and the LED. In the constant voltage driving mode, the luminance of the OLED and LED increases with the increase of the driving current, and the luminance of the display can be adjusted directly by changing the magnitude of the common cathode voltage, as shown in fig. 1, it is composed of a pixel circuit 1, an external voltage source Vdata, and an external OLED within a dashed line frame. The drain electrode of the P-type MOS tube MP is connected with the positive end of the input voltage source Vdata, and the source electrode of the P-type MOS tube MP is connected with one end of the capacitor C and the grid electrode of the N-type MOS tube MN. The gate of the P-type MOS transistor MP is connected to a row selection control signal SEL 1. The negative end of the voltage source Vdata and the other end of the capacitor C are connected with the ground GND. The drain electrode of the N-type MOS tube MN is connected with a voltage VDD, and the source electrode of the N-type MOS tube MN is connected with the anode of the OLED. The cathode of the OLED is connected with Vcom voltage; the working process is as follows: when the row selection control signal SEL1 is at a low level, the switch tube MP is turned on, the driving signal data Vdata is written into the storage capacitor C, the driving tube MN is turned on to drive the OLED to emit light, and the driving current corresponds to Vdata to adjust the brightness of the pixel. When SEL1 is at high level, switch MP is turned off, Vdata is already stored in C, MN is still in on-phase, and the driving current remains unchanged. When Vdata is unchanged, namely the same gray scale is achieved, the luminance of the OLED emitting light can be adjusted by adjusting the cathode voltage VCOM of the OLED, and the larger the absolute value of VCOM is, the larger the voltage difference between two ends of the OLED is, the larger the current flowing through the OLED is, and the higher the light emitting luminance is. This approach does not achieve wide dynamic range dimming with proper uniformity. Simultaneously, changing the magnitude of the common cathode voltage VCOM may cause the GAMMA (GAMMA) characteristics of the light emitted by the OLED and the LED to change, thereby affecting the display effect.
Disclosure of Invention
The invention aims to design a micro-display driving circuit capable of improving the dimming in a wide dynamic range and simultaneously provide a corresponding dimming method aiming at the problem that the existing brightness adjusting circuit cannot obtain the dimming in a wide dynamic range with proper uniformity. The common cathode voltage is adjusted by adopting the pulse number in a PFM (pulse Frequency modulation) mode to realize the brightness adjustment, so that the micro display can maintain the consistency of gray scale and chromaticity in the whole brightness adjustment range.
One of the technical schemes of the invention is as follows:
a micro-display driving circuit capable of improving wide dynamic range brightness, which comprises 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, and is characterized in that the drain electrode of the P-type MOS tube MP1 is connected with the positive end of an input voltage source Vdata, and the source electrode of the P-type MOS tube MP1 is connected with one end of the capacitor C1 and the grid electrode of the N-type MOS tube MN 1; the grid electrode of the P-type MOS tube MP1 is connected with an external control signal SEL 2; the negative end of the voltage source Vdata and the other end of the capacitor C1 are connected with the ground GND; the drain electrode of the N-type MOS tube MN1 is connected with a voltage VDD, the source electrode of the N-type MOS tube MN1 is connected with the anode of the OLED, and the cathode of the OLED is connected with the drain electrode of the P-type MOS tube MP2 and the drain electrode of the N-type MOS tube MN 2; the source of the P-type MOS transistor MP2 is connected with the ground GND, the gate of the P-type MOS transistor MP2 and the gate of the N-type MOS transistor MN2 are connected with VPULSE, and the source of the N-type MOS transistor MN2 is connected with Vcom. When VPULSE is changed from 0 to N, the data voltage Vdata is not changed, the anode voltage of the OLED is not changed, the current flowing through the OLED is not changed, and the change of N only influences the conduction time of the constant current flowing through the OLED. The constant current is not changed, the light emitting characteristic of the OLED cannot be changed, the VPULSE pulse width is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit can realize the dimming range of N level without influencing the light-emitting characteristic of the OLED, and can not generate the screen flash phenomenon caused by insufficient refresh frequency in the traditional PWM dimming.
The second technical scheme of the invention comprises the following steps:
a micro-display driving circuit capable of improving wide dynamic range brightness, which comprises a P-type MOS tube MP3, a P-type MOS tube MP4, a capacitor C2, an N-type MOS tube MN3 and an N-type MOS tube MN4, and is characterized in that the drain electrode of the P-type MOS tube MP3 is connected with the positive end of an input voltage source Vdata, and the source electrode of the P-type MOS tube MP3 is connected with one end of the capacitor C2 and the grid electrode of the N-type MOS tube MN 3; the grid electrode of the P-type MOS tube MP3 is connected with an external control signal SEL 3; the negative end of the voltage source Vdata and the other end of the capacitor C2 are connected with the ground GND; the drain electrode of the N-type MOS tube MN3, the drain electrode of the P-type MOS tube MP4 and the drain electrode of the N-type MOS tube MN4 are connected to a point D; the source electrode of the N-type MOS transistor MN3 is connected with the anode of the OLED, and the cathode of the OLED is connected with Vcom; the source electrode of the P-type MOS tube MP4 is connected with VDD, the grid electrode of the P-type MOS tube MP4 and the grid electrode of the N-type MOS tube MN4 are connected with VPULSE, and the source electrode of the N-type MOS tube MN4 is connected with GND. When VPULSE is changed from 0 to N, the data voltage Vdata is not changed, the anode voltage of the OLED is not changed, the current flowing through the OLED is not changed, and the change of N only influences the conduction time of the constant current flowing through the OLED. The constant current is not changed, the light emitting characteristic of the OLED cannot be changed, the VPULSE pulse width is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit can realize the dimming range of N level without influencing the light-emitting characteristic of the OLED, and can not generate the screen flash phenomenon caused by insufficient refresh frequency in the traditional PWM dimming.
The third technical scheme of the invention is as follows:
a method for adjusting brightness of a micro display driving circuit is characterized in that: by adopting PFM control mode, after the field synchronizing signal is changed into high level, N high pulses are generated averagely in one field time of VPULSE, the pulse width is fixed, MN2 is conducted in the time that VPULSE pulse is high level, and the voltage of point C is equal to VCOMVoltage, after the VPULSE pulse changes to low level, the voltage at point C is equal to the GND voltage; the voltage at the point C is zero, and the current Ioled flowing through the OLED follows the voltageAnd clearing, wherein the OLED is turned off from light emitting, so that under the condition of fixed pulse width, the luminous brightness of the OLED is accurately adjusted by adjusting the pulse frequency.
The invention relates to a novel micro-display pixel driving circuit, which comprises a driving tube, a switching tube and a storage capacitor. The vpuse signal is divided into N stages, which regulate the common cathode voltage VCOM or the supply voltage VDD. An N-level dimming range can be achieved.
The invention has the advantages and obvious effects that:
1. the novel pixel driving circuit of the invention adjusts the voltage of the public cathode by adopting the pulse number to realize brightness adjustment, and can obtain a wider linear brightness adjustment range.
The VPULSE pulse number is evenly distributed in one frame time, the frequency is high, each pixel can be continuously modulated in one frame time, and the flicker problem of the conventional constant frequency (generally, frame frequency) PWM (pulse width modulation) brightness of the common cathode display is solved.
3. The invention adopts the switch tube to realize brightness adjustment, has simple structure, can save area and has large adjustable range.
4. The invention relates to a brightening method. The frequency is high, each pixel can be modulated continuously in one frame time, and the problem of flicker of the display in the process of lightening is eliminated.
Drawings
Fig. 1 is a conventional pixel circuit diagram.
Fig. 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 a second pixel circuit diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The first embodiment.
As shown in fig. 2.
A micro-display drive circuit capable of improving wide dynamic range brightness modulation is characterized in that a drain electrode of a P-type MOS tube MP1 is connected with a positive end of an input voltage source Vdata, and a source electrode of a P-type MOS tube MP1 is connected with one end of a capacitor C1 and a grid electrode of an N-type MOS tube MN 1. The gate of the P-type MOS transistor MP1 is connected to an external control signal SEL 2. The negative end of the voltage source Vdata and the other end of the capacitor C1 are connected with the ground GND. The drain electrode of the N-type MOS tube MN1 is connected with a voltage VDD, the source electrode of the N-type MOS tube MN1 is connected with the anode of the OLED, and the cathode of the OLED is connected with the drain electrode of the P-type MOS tube MP1 and the drain electrode of the N-type MOS tube MN 2. The source of the P-type MOS transistor MP1 is connected with the ground GND, the gate of the P-type MOS transistor MP1 and the gate of the N-type MOS transistor MN2 are connected with VPULSE, and the source of the N-type MOS transistor MN2 is connected with Vcom. When VPULSE is changed from 0 to N, the data voltage Vdata is not changed, the anode voltage of the OLED is not changed, the current flowing through the OLED is not changed, and the change of N only influences the conduction time of the constant current flowing through the OLED. The constant current is not changed, the light emitting characteristic of the OLED cannot be changed, the VPULSE pulse width is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit can realize the dimming range of N level without influencing the light-emitting characteristic of the OLED, and can not generate the screen flash phenomenon caused by insufficient refresh frequency in the traditional PWM dimming.
The operation of the circuit shown in fig. 2 is as follows:
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 stages, when VPULSE =1, after the field synchronizing signal changes to high level, the VPULSE immediately generates a high pulse, the pulse width is one line time, MN2 is conducted in one line time, and the voltage at the point C is equal to VCOMAfter the voltage, VPULSE pulse, goes low, the voltage at point C is equal to the GND voltage. When VPULSE = N, after the field synchronizing signal changes to high level, N high pulses are generated averagely in one field time of VPULSE, the pulse width is one line time, MN2 is conducted in the high level time of VPULSE, and the voltage at point C is equal to VCOMAfter the voltage, VPULSE pulse, goes low, the voltage at point C is equal to the GND voltage. The voltage at the point C is zero, the current Ioled flowing through the OLED is cleared accordingly, and the OLED is turned off from light emitting, so that the light emitting time of the OLED device is accurately controlled, and the light emitting brightness of the OLED is adjusted by controlling the light emitting time. When VPULSE changes from 0 to NThe change in N only affects the time that the OLED is flowing through a constant current. The constant current is not changed, and the light emitting characteristics of the OLED are not changed. The pixel circuit can realize the brightness adjusting range of N level under the condition of not influencing the light emitting characteristic of the OLED. And VPULSE pulse width is fixed, the pulse frequency is higher, and the average distribution in a frame time can continuously modulate each pixel in a frame time, and the flicker problem when the display is brightened by using the traditional low-frequency PWM mode is solved.
Example two.
As shown in fig. 4.
A micro-display drive circuit capable of improving wide dynamic range brightness modulation is characterized in that a drain electrode of a P-type MOS tube MP3 is connected with a positive end of an input voltage source Vdata, and a source electrode of a P-type MOS tube MP3 is connected with one end of a capacitor C2 and a grid electrode of an N-type MOS tube MN 3. The gate of the P-type MOS transistor MP3 is connected to an external control signal SEL 3. The negative end of the voltage source Vdata and the other end of the capacitor C2 are connected with 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 electrode of the N-type MOS transistor MN3 is connected with the anode of the OLED, and the cathode of the OLED is connected with Vcom. The source electrode of the P-type MOS tube MP4 is connected with VDD, the grid electrode of the P-type MOS tube MP4 and the grid electrode of the N-type MOS tube MN4 are connected with VPULSE, and the source electrode of the N-type MOS tube MN4 is connected with GND. When VPULSE is changed from 0 to N, the data voltage Vdata is not changed, the anode voltage of the OLED is not changed, the current flowing through the OLED is not changed, and the change of N only influences the conduction time of the constant current flowing through the OLED. The constant current is not changed, the light emitting characteristic of the OLED cannot be changed, the VPULSE pulse width is constant, and the modulation of the constant current conduction time is realized by adjusting the pulse frequency. Therefore, the pixel circuit can realize the dimming range of N level without influencing the light-emitting characteristic of the OLED, and can not generate the screen flash phenomenon caused by insufficient refresh frequency in the traditional PWM dimming.
The operation of the circuit shown in fig. 4 is as follows:
when the row selection control signal SEL3 is at a low level, the switching 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 stages, when VPULSE =1, the VPULSE immediately generates a high pulse after the field sync signal changes to a high level, the pulse width is one line time, MN4 is turned on in one line time, the voltage at the D point is equal to the GND voltage, and the voltage at the D point is equal to the VDD voltage after the VPULSE pulse changes to a low level. When VPULSE = N, after the field synchronizing signal changes to high level, N high pulses are generated on average within one field time of VPULSE, the pulse width is one line time, and after the VPULSE pulse changes to low level, the voltage of a point D is equal to the voltage of VDD. The VPULSE pulse is conducted by MN4 within the high level time, the voltage at the point D is equal to the GND voltage, the voltage at the point D is zero, the current Ioled flowing through the OLED is cleared accordingly, and the OLED is turned off from light emitting, so that the accurate control of the light emitting time of the OLED device is realized. Under the condition of fixed pulse width, the accurate adjustment of the brightness of the OLED light emission is realized by adjusting the pulse frequency.
Example three.
As shown in fig. 3.
A method for regulating brightness of micro display drive circuit adopts PFM control mode, after field synchronizing signal is changed into high level, VPULSE generates N high pulses uniformly in one field time, and pulse width is fixed, VPULSE pulse is MN2 conduction in high level time, C point voltage is equal to V point voltageCOMVoltage, after the VPULSE pulse changes to low level, the voltage at point C is equal to the GND voltage; the voltage at the point C is zero, the current Ioled flowing through the OLED is cleared accordingly, and the OLED is turned off from light emitting, so that the luminous brightness of the OLED is accurately adjusted by adjusting the pulse frequency under the condition that the pulse width is fixed.
The present invention is not limited to the above embodiments, and any variation of the VPULSE signal implementation form can be used to control the VCOM or VDD voltage of the common cathode OLED by using the number of VPULSE pulses to realize the structure of brightness adjustment, which falls within the protection scope of the present invention.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.
Claims (3)
1. A micro-display driving circuit capable of improving wide dynamic range brightness, which comprises 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, and is characterized in that the drain electrode of the P-type MOS tube MP1 is connected with the positive end of an input voltage source Vdata, and the source electrode of the P-type MOS tube MP1 is connected with one end of the capacitor C1 and the grid electrode of the N-type MOS tube MN 1; the grid electrode of the P-type MOS tube MP1 is connected with an external control signal SEL 2; the negative end of the voltage source Vdata and the other end of the capacitor C1 are connected with the ground GND; the drain electrode of the N-type MOS tube MN1 is connected with a voltage VDD, the source electrode of the N-type MOS tube MN1 is connected with the anode of the OLED, and the cathode of the OLED is connected with the drain electrode of the P-type MOS tube MP2 and the drain electrode of the N-type MOS tube MN 2; the source of the P-type MOS transistor MP2 is connected with the ground GND, the gate of the P-type MOS transistor MP2 and the gate of the N-type MOS transistor MN2 are connected with VPULSE, and the source of the N-type MOS transistor MN2 is connected with Vcom.
2. A micro-display driving circuit capable of improving wide dynamic range brightness, which comprises a P-type MOS tube MP3, a P-type MOS tube MP4, a capacitor C2, an N-type MOS tube MN3 and an N-type MOS tube MN4, and is characterized in that the drain electrode of the P-type MOS tube MP3 is connected with the positive end of an input voltage source Vdata, and the source electrode of the P-type MOS tube MP3 is connected with one end of the capacitor C2 and the grid electrode of the N-type MOS tube MN 3; the grid electrode of the P-type MOS tube MP3 is connected with an external control signal SEL 3; the negative end of the voltage source Vdata and the other end of the capacitor C2 are connected with the ground GND; the drain electrode of the N-type MOS tube MN3, the drain electrode of the P-type MOS tube MP4 and the drain electrode of the N-type MOS tube MN4 are connected to a point D; the source electrode of the N-type MOS transistor MN3 is connected with the anode of the OLED, and the cathode of the OLED is connected with Vcom; the source electrode of the P-type MOS tube MP4 is connected with VDD, the grid electrode of the P-type MOS tube MP4 and the grid electrode of the N-type MOS tube MN4 are connected with VPULSE, and the source electrode of the N-type MOS tube MN4 is connected with GND.
3. A method of dimming a microdisplay driver circuit according to claim 1 or 2, comprising: by adopting PFM control mode, after the field synchronizing signal is changed into high level, N high pulses are generated averagely in one field time of VPULSE, the pulse width is fixed, MN2 is conducted in the time that VPULSE pulse is high level, and the voltage of point C is equal to VCOMVoltage, after the VPULSE pulse changes to low level, the voltage at point C is equal to the GND voltage; the voltage at the point C is zero, the current Ioled flowing through the OLED is cleared accordingly, and the OLED is turned off from light emitting, so that the luminous brightness of the OLED is realized by adjusting the pulse frequency under the condition that the pulse width is fixedAnd (4) accurately adjusting.
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| CN201910955806.9A CN110675806A (en) | 2019-10-09 | 2019-10-09 | Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method |
| PCT/CN2020/087896 WO2021068492A1 (en) | 2019-10-09 | 2020-04-29 | Micro-display driving circuit capable of improving wide-dynamic-range brightness adjustment, and brightness adjustment method |
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| CN201910955806.9A CN110675806A (en) | 2019-10-09 | 2019-10-09 | Micro display driving circuit capable of improving wide dynamic range brightness and brightness adjusting method |
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| 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 |
| WO2021068492A1 (en) * | 2019-10-09 | 2021-04-15 | 南京国兆光电科技有限公司 | Micro-display driving circuit capable of improving wide-dynamic-range brightness adjustment, and brightness adjustment method |
| 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 |
| CN114822394A (en) * | 2022-05-05 | 2022-07-29 | 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 |
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| WO2022241827A1 (en) * | 2021-05-19 | 2022-11-24 | Tcl华星光电技术有限公司 | Driving circuit, display panel, and electronic device |
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