CN116978313A - Pixel driving circuit and display device - Google Patents

Pixel driving circuit and display device Download PDF

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Publication number
CN116978313A
CN116978313A CN202210423015.3A CN202210423015A CN116978313A CN 116978313 A CN116978313 A CN 116978313A CN 202210423015 A CN202210423015 A CN 202210423015A CN 116978313 A CN116978313 A CN 116978313A
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CN
China
Prior art keywords
transistor
driving circuit
terminal
light emitting
pulse width
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Pending
Application number
CN202210423015.3A
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Chinese (zh)
Inventor
冯中山
陈靖中
朱晓杰
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Chongqing Kangjia Optoelectronic Technology Co ltd
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Chongqing Kangjia Optoelectronic Technology Co ltd
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Priority to CN202210423015.3A priority Critical patent/CN116978313A/en
Publication of CN116978313A publication Critical patent/CN116978313A/en
Pending legal-status Critical Current

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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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance

Abstract

The disclosure relates to a pixel driving circuit and a display device, and relates to the technical field of display. The pixel driving circuit includes: the pulse width modulation driving circuit is used for adjusting current flowing through the light emitting device, and is connected with the pulse width modulation driving circuit through the switching tube and used for controlling light emitting time of the light emitting device. The pixel driving circuit adopts two driving modes of pulse width modulation driving and pulse amplitude modulation driving, so that the influence on display caused by the wavelength change of the driving current flowing in the light emitting diodes with different colors is eliminated, and the image quality of the display panel is improved.

Description

Pixel driving circuit and display device
Technical Field
The disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit and a display device.
Background
In the light emitting diode display device, the light emitting luminance of the light emitting diode depends on the driving current flowing through the light emitting diode. A conventional display panel pixel generally includes a plurality of sub-pixels, such as light emitting devices, which may include red light emitting diodes, green red light emitting diodes, blue light emitting diodes, and the like, as sub-pixels, each of which includes a pixel driving circuit for driving the sub-pixel. When the display panel works, each sub-pixel displays different color levels to display different pictures by a pulse amplitude modulation driving mode.
However, when the light emitting diode emits light, the driving current flowing through the light emitting diode depends on the threshold voltage of the driving transistor functioning as a switching transistor, and thus, a change in the threshold voltage in the driving transistor may cause a change in the driving current flowing through the light emitting diode, thereby causing the light emitting diode to emit non-uniformly, thereby affecting the gray scale and the image quality of the display panel. In addition, due to the amplitude of the driving current flowing through the light emitting diodes of different colors, the wavelength of the corresponding light may vary, resulting in a decrease in color reproducibility of the displayed image.
Therefore, how to eliminate the influence of the driving current amplitude in the leds with different colors on the display is a need for solving the problem.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present application is to provide a pixel driving circuit and a display device, so as to effectively eliminate the influence of the amplitude of the driving current in the light emitting diodes with different colors on the display.
An embodiment of the present application provides a pixel driving circuit, including: the LED driving circuit comprises a pulse amplitude modulation driving circuit, a pulse width modulation driving circuit and a switching tube, wherein the pulse amplitude modulation driving circuit is used for adjusting current flowing through a light emitting device; the pulse amplitude modulation driving circuit comprises a first input end, a second input end, a third input end, a fourth input end, a fifth input end, a sixth input end, a seventh input end and an output end; the first input end of the pulse amplitude modulation driving circuit is connected with a power supply voltage; the second input end of the pulse amplitude modulation driving circuit is connected with the switching tube, the third input end of the pulse amplitude modulation driving circuit is connected with the first light-emitting control signal, the fourth input end of the pulse amplitude modulation driving circuit is connected with the data driving signal, the fifth input end of the pulse amplitude modulation driving circuit is connected with the scanning driving signal, the sixth input end of the pulse amplitude modulation driving circuit is connected with the third light-emitting control signal, the seventh input end of the pulse amplitude modulation driving circuit is connected with the second light-emitting control signal, and the output end of the pulse amplitude modulation driving circuit is connected with the light-emitting device; the pulse width modulation driving circuit is connected with the pulse amplitude modulation driving circuit through a switching tube and is used for controlling the light emitting time of the light emitting device.
The pixel driving circuit can simultaneously realize the modes of pulse width modulation driving and pulse amplitude modulation driving to control the light emitting time of the light emitting device and the current flowing through the light emitting device so as to drive the light emitting device to emit light, and the two driving modes can be combined to eliminate the change of the light wavelength caused by the amplitude of the driving current flowing in the light emitting diodes with different colors so as to eliminate the influence of the change of the light wavelength on display. In addition, the pixel driving circuit can eliminate the influence of the threshold voltage of the pulse amplitude modulation transistor in the pulse amplitude modulation driving mode and eliminate the influence of the threshold voltage of the pulse width modulation transistor in the pulse width modulation driving mode, thereby improving the image quality of the display panel.
Optionally, the pulse amplitude modulation driving circuit includes: the first transistor comprises a control end, a first end and a second end, wherein the control end of the first transistor is connected with a first light-emitting control signal, and the first end of the first transistor is connected with a power supply voltage; the second transistor comprises a control end, a first end and a second end, the control end of the second transistor is connected with a second light-emitting control signal, and the second end of the second transistor is connected with the light-emitting device; a third transistor including a control terminal, a first terminal, and a second terminal, the control terminal of the third transistor being connected to a third light emission control signal, the first terminal of the third transistor being connected to the first light emission control signal; the data transistor comprises a control end, a first end and a second end, the control end of the data transistor is connected with the scanning driving signal, the first end of the data transistor is connected with the data driving signal, and the second end of the data transistor is connected with the second end of the first transistor; the control end of the pulse amplitude modulation transistor is connected with the second end of the third transistor and the first end of the second transistor to jointly form a second input end of the pulse amplitude modulation driving circuit; one end of the first capacitor is connected with the power supply voltage, and the other end of the first capacitor is connected with the second end of the first transistor and the second end of the data transistor; and one end of the second capacitor is connected with the second end of the first transistor and the second end of the data transistor, and the other end of the second capacitor is connected with the control end of the pulse amplitude modulation transistor, the second end of the third transistor and the first end of the second transistor.
Optionally, the pwm driving circuit includes a first input end, a second input end, a third input end, a fourth input end, a fifth input end, a sixth input end, a seventh input end, an eighth input end, and an output end, where the first input end of the pwm driving circuit is connected to a power supply voltage, the second input end of the pwm driving circuit is connected to a pwm signal, the third input end of the pwm driving circuit is connected to a fourth lighting control signal, the fourth input end of the pwm driving circuit is connected to a data driving signal, the fifth input end of the pwm driving circuit is connected to a first lighting control signal, the sixth input end of the pwm driving circuit is connected to a third lighting control signal, the seventh input end of the pwm driving circuit is connected to a second lighting control signal, the eighth input end of the pwm driving circuit is connected to a first lighting control signal, and the output end of the pwm driving circuit is connected to a switching tube.
Optionally, the pulse width modulation driving circuit includes: the control end of the fourth transistor is connected with a fourth light-emitting control signal, and the first end of the fourth transistor is connected with a data driving signal; the control end of the sixth transistor is connected with the first light-emitting control signal, and the first end of the sixth transistor is connected with the power supply voltage; the seventh transistor comprises a control end, a first end and a second end, the control end of the seventh transistor is connected with a second light-emitting control signal, and the second end of the seventh transistor is connected with the switch tube; an eighth transistor including a control terminal, a first terminal, and a second terminal, the control terminal of the eighth transistor being connected to the third light emission control signal, the first terminal of the eighth transistor being connected to the first light emission control signal; the control end of the pulse width modulation transistor is connected with the first end of the seventh transistor and the second end of the eighth transistor, the first end of the pulse width modulation transistor is connected with the power supply voltage, and the second end of the pulse width modulation transistor and the second end of the seventh transistor are used as the output end of the pulse width modulation driving circuit to be connected with the switch transistor; one end of the third capacitor is connected with the pulse width modulation signal, and the other end of the third capacitor is connected with the second end of the fourth transistor and the second end of the sixth transistor; and one end of the fourth capacitor is connected with the third capacitor, the second end of the fourth transistor and the second end of the sixth transistor, and the other end of the fourth capacitor is connected with the control end of the pulse width modulation transistor, the first end of the seventh transistor and the second end of the eighth transistor.
Optionally, the switching tube comprises a fifth transistor, and the switching tube comprises a control end, a first end and a second end; the control end of the switching tube is connected with the fifth light-emitting control signal, the first end of the switching tube is connected with the output end of the pulse width modulation driving circuit, and the second end of the switching tube is connected with the second input end of the pulse amplitude modulation driving circuit.
Optionally, the light emitting device includes a light emitting diode, an anode of the light emitting diode is connected to an output terminal of the pulse amplitude modulation driving circuit, and a cathode of the light emitting diode is grounded.
Optionally, each transistor includes a PMOS transistor, a control terminal of each transistor is a gate, a first terminal of each transistor is a source, and a second terminal of each transistor is a drain.
Based on the same inventive concept, the present application also provides a display apparatus including: a plurality of light emitting pixels arranged in a plurality of rows and a plurality of columns, each light emitting pixel including a plurality of light emitting sub-pixels, each light emitting sub-pixel serving as an independent light emitting device; a plurality of pixel driving circuits according to any one of the above, the pixel driving circuits being connected in one-to-one correspondence with the light emitting sub-pixels; the data driving signal generating circuit is used for sequentially connecting the pixel driving circuits positioned in the same column in series and generating data driving signals; the scanning driving signal generating circuit is used for sequentially connecting the pixel driving circuits positioned in the same row in series and generating a scanning driving signal and a pulse width luminescence modulation signal; the pixel driving circuits positioned in the same row are sequentially connected in series by the light-emitting control signal generating circuit, and the light-emitting control signal generating circuit is used for generating light-emitting control signals.
Optionally, the light emitting pixels each include a red subpixel, a blue subpixel, and a green subpixel.
Optionally, the display device comprises a cell phone, a tablet computer, a display, an AR, or a wearable device.
The pixel driving circuit in the display device controls the light emitting time of the light emitting device and the current flowing through the light emitting device by adopting the mode of pulse width modulation driving and pulse amplitude modulation driving, so that the light emitting device is driven to emit light, the change of the wavelength of light caused by the amplitude of the driving current flowing in the light emitting diodes with different colors is eliminated, and the influence of the wavelength change on display is eliminated. In addition, the pixel driving circuit in the display device can eliminate the influence of the threshold voltage of the pulse amplitude modulation transistor in the pulse amplitude modulation driving mode and eliminate the influence of the threshold voltage of the pulse width modulation transistor in the pulse width modulation driving mode, so that the image quality of the display panel is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other embodiments of the drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a pixel driving circuit according to an embodiment;
FIG. 2 is a timing diagram of signals in a pixel driving circuit according to one embodiment;
FIG. 3 is a schematic diagram showing the relationship between the driving current flowing in different LEDs and the wavelength; fig. 3 (a) is a schematic diagram of a relationship between a driving current flowing in a blue led and a wavelength; fig. 3 (b) is a schematic diagram showing the relationship between the driving current flowing in the green led and the wavelength; FIG. 3 (c) is a graph showing the relationship between the driving current flowing in the red LED and the wavelength;
fig. 4 is a block diagram of a display device according to an embodiment.
Reference numerals illustrate:
10-pulse amplitude modulation driving circuit;
20-pulse width modulation driving circuit;
30-switching tube;
40-a light emitting device;
T 1 -a first transistor; t (T) 2 -a second transistor; t (T) 3 -a third transistor; t (T) 4 -a fourth transistor; t (T) 5 -a fifth transistor; t (T) 6 -a sixth transistor; t (T) 7 -a seventh transistor; t (T) 8 -an eighth transistor; t (T) A -a pulse amplitude modulation transistor; t (T) W -a pulse width modulation transistor; t (T) D -a data transistor;
K 1 -a first light emitting control signal; k (K) 2 -a second lighting control signal; k (K) 3 -a third lighting control signal; k (K) 4 -a fourth lighting control signal; k (K) 5 -a fifth lighting control signal;
V scan -a scan drive signal; v (V) data -a data driving signal; v (V) PWM -a pulse width luminescence modulated signal; v (V) DD -a supply voltage; v (V) SS -a supply voltage;
C 1 -a first capacitance; c (C) 2 -a second capacitance; c (C) 3 -a third capacitance;
100-light emitting pixels; 200-a data driving signal generating circuit; 300-a scan driving signal generating circuit; 400-a light emission control signal generation circuit.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the light emitting diode display device, the light emitting luminance of the light emitting diode depends on the driving current flowing through the light emitting diode. A conventional display panel pixel generally includes a plurality of sub-pixels, such as light emitting devices, which may include red light emitting diodes, green red light emitting diodes, blue light emitting diodes, and the like, as sub-pixels, each of which includes a pixel driving circuit for driving the sub-pixel. When the display panel works, each sub-pixel displays different color levels to display different pictures by a pulse amplitude modulation driving mode.
However, when the light emitting diode emits light, the driving current flowing through the light emitting diode depends on the threshold voltage of the driving transistor, so that the variation of the threshold voltage in the driving transistor may cause the variation of the driving current flowing through the light emitting diode, and thus the light emitting diode emits light unevenly, thereby affecting the gray scale and the image quality of the display panel. In addition, due to the amplitude of the driving current flowing through the light emitting diodes of different colors, the wavelength of the corresponding light may vary, resulting in a decrease in color reproducibility of the displayed image.
Therefore, how to eliminate the influence of the driving current amplitude in the leds with different colors on the display is a need for solving the problem.
In view of the above-mentioned shortcomings of the prior art, an object of the present application is to provide a pixel driving circuit and a display device, which are capable of effectively eliminating the influence of the amplitude of the driving current in the light emitting diodes with different colors on the display.
Referring to fig. 1, an embodiment of the present application provides a pixel driving circuit, including: a pulse amplitude modulation (Pulse Amplitude Modulation, PAM) drive circuit 10, a pulse width modulation (Pluse Width Modulation, PWM) drive circuit 20, and a switching tube 30; the pulse amplitude modulation driving circuit 20 is used for adjusting the current flowing through the light emitting device 40; the pwm driving circuit 10 includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, and an output terminal; wherein a first input end of the pulse amplitude modulation driving circuit 10 is connected with a power supply voltage VDD; a second input end of the pulse amplitude modulation driving circuit 10 is connected with the switch tube 30, and a third input end of the pulse amplitude modulation driving circuit 10 is connected with the first luminous control letter K 1 A fourth input terminal of the pulse amplitude modulation driving circuit 10 is connected with the data driving signal V data A fifth input terminal of the pulse amplitude modulation driving circuit 10 is connected with the scanning driving signal V scan A sixth input terminal of the pulse amplitude modulation driving circuit 10 is connected with a third light emitting control signal K 3 A seventh input terminal of the pulse amplitude modulation driving circuit 10 is connected with the second light emitting control signal K 2 The output end of the pulse amplitude modulation driving circuit 10 is connected with the light emitting device 40; the pwm driving circuit 20 is connected to the pwm driving circuit 10 via a switching transistor 30 for controlling the light emitting time of the light emitting device 40.
The pixel driving circuit can simultaneously realize the modes of pulse width modulation driving and pulse amplitude modulation driving to control the light emitting time of the light emitting device and the current flowing through the light emitting device so as to drive the light emitting device to emit light, and the two driving modes can be combined to eliminate the change of the light wavelength caused by the amplitude of the driving current flowing in the light emitting diodes with different colors so as to eliminate the influence of the change of the light wavelength on display. In addition, the pixel driving circuit can eliminate the influence of the threshold voltage of the pulse amplitude modulation transistor in the pulse amplitude modulation driving mode and eliminate the influence of the threshold voltage of the pulse width modulation transistor in the pulse width modulation driving mode, thereby improving the image quality of the display panel.
In some examples, the pulse amplitude modulation driving circuit 10 includes: first transistor T 1 First transistor T 1 Comprises a control terminal, a first terminal and a second terminal, a first transistor T 1 And a first light emitting control signal K 1 Connected to a first transistor T 1 And a power supply voltage V DD Is connected with each other; second transistor T 2 Second transistor T 2 Comprises a control end, a first end and a second end, a second transistor T 2 And a second light-emitting control signal K 2 Connected to a second transistor T 2 Is connected to the light emitting device 40; third transistor T 3 Third transistor T 3 Comprises a control end, a first end and a second end, a third transistor T 3 And a third light emission control signal K 3 Is connected to a third transistor T 3 Is connected with the first end of the first luminous control signal K 1 Is connected with each other; data transistor T D Data transistor T D Includes a control terminal, a first terminal and a second terminal, a data transistor T D Control terminal of (a) and scan driving signal V scan Connected to the data transistor T D Is connected with the first end of the data driving signal V data Connected to the data transistor T D And the second end of the first transistor T 1 Is connected to the second end of the first member; pulse amplitude modulation transistor T A Pulse amplitude modulation transistor T A Comprises a control end, a first end and a second end, a pulse amplitude modulation transistor T A Control of (2)End-of-line and third transistor T 3 Second terminal of (a) and second transistor T 2 Is connected to a second input terminal of the pulse amplitude modulation driving circuit 10 and a switching tube 30, and a pulse amplitude modulation transistor T A And a power supply voltage V DD Connected with, pulse amplitude modulation transistor T A And a second transistor T 2 The second ends of which are connected to form the output end of the pulse amplitude modulation driving circuit 10 together and are connected with the light emitting device 40; first capacitor C 1 First capacitor C 1 One end of (2) is connected with the power supply voltage V DD Connected with a first capacitor C 1 And the other end of the first transistor T 1 Second terminal of (a) and data transistor T D Is connected with the second end of the first connecting piece; second capacitor C 2 Second capacitor C 2 One end of (a) and the first transistor T 1 Second terminal of (a) and data transistor T D A second capacitor C connected to the second end of the first capacitor 2 And the other end of the pulse amplitude modulation transistor T A Control terminal of third transistor T 3 Second terminal of (a) and second transistor T 2 Is connected at a first end thereof.
In some examples, the pwm driving circuit 20 includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, an eighth input terminal, and an output terminal, wherein the first input terminal of the pwm driving circuit 20 is connected to the power supply voltage V DD A second input terminal of the PWM driving circuit 20 is connected to a PWM signal V PWM A third input terminal of the PWM driving circuit 20 is connected to a fourth light emission control signal K 4 A fourth input terminal of the PWM driving circuit 20 is connected to the data driving signal V data A fifth input terminal of the PWM driving circuit 20 is connected to the first light emitting control signal K 1 A sixth input terminal of the PWM driving circuit 20 is connected to a third light emission control signal K 3 A seventh input terminal of the PWM driving circuit 20 is connected to the second light emission control signal K 2 Connected, pulseAn eighth input terminal of the PWM driving circuit 20 and a first light emitting control signal K 1 And the output end of the pulse width modulation driving circuit 20 is connected with the switching tube 30.
In some examples, the pulse width modulation driving circuit 20 includes: fourth transistor T 4 Fourth transistor T 4 Comprises a control terminal, a first terminal, a second terminal, and a fourth transistor T 4 And a fourth light emission control signal K 4 Connected to a fourth transistor T 4 Is connected with the first end of the data driving signal V data Is connected with each other; sixth transistor T 4 Sixth crystal T 4 The transistor includes a control terminal, a first terminal, a second terminal, and a sixth transistor T 6 And a first light emitting control signal K 1 Connected to a sixth transistor T 6 And a power supply voltage V DD Is connected with each other; seventh transistor T 7 Seventh transistor T 7 Comprises a control terminal, a first terminal and a second terminal, a seventh transistor T 7 And a second light-emitting control signal K 2 Connected with a seventh transistor T 7 Is connected to the switching tube 30; eighth transistor T 8 Eighth transistor T 8 Comprises a control terminal, a first terminal and a second terminal, an eighth transistor T 8 And a third light emission control signal K 3 Is connected to an eighth transistor T 8 Is connected with the first end of the first luminous control signal K 1 Is connected with each other; pulse width modulation transistor T W Pulse width modulation transistor T W Comprises a control end, a first end and a second end, a pulse width modulation transistor T W Control terminal of (c) and seventh transistor T 7 Is connected to the first end of the eighth transistor T 8 Is connected to the second terminal of the pulse width modulation transistor T W And a power supply voltage V DD Connected to, pulse width modulation transistor T W And a seventh transistor T 7 The second end of the pulse width modulation driving circuit 20 is used as the output end of the pulse width modulation driving circuit to be connected with the switching tube 30; third capacitor C 3 Third capacitor C 3 Is connected with one end of the pulse width modulation signal K W Is connected with a third capacitor C 3 And the other end of the fourth transistor T 4 Second terminal of (d) and sixth transistor T 6 Is connected with the second end of the first connecting piece; fourth capacitor C 4 Fourth capacitor C 4 One end of (C) is connected with a third capacitor C 3 Fourth transistor T 4 Second terminal of (d) and sixth transistor T 6 A fourth capacitor C connected to the second end of the capacitor 4 And the other end of the pulse width modulation transistor T W Control terminal of (c) seventh transistor T 7 Is connected to the first end of the eighth transistor T 8 Is connected to the second end of the first member.
In some examples, the switching tube 30 includes a fifth transistor, and in particular, the switching tube 30 includes a control terminal, a first terminal, and a second terminal; control end of the switching tube 30 and fifth lighting control signal K 5 The first end of the switching tube 30 is connected with the output end of the pulse width modulation driving circuit 20, and the second end of the switching tube 30 is connected with the second input end of the pulse amplitude modulation driving circuit 10.
In some examples, the light emitting device 40 comprises a light emitting diode with its anode connected to the output of the pulse amplitude modulation driving circuit 10 and its cathode grounded.
In some examples, each transistor includes a PMOS transistor, the control terminal of each transistor is a gate, the first terminal of each transistor is a source, and the second terminal of each transistor is a drain; i.e. the first transistor T 1 Second transistor T 2 Third transistor T 3 Fourth transistor T 4 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Data transistor T D Pulse width modulation transistor T w Pulse amplitude modulation transistor T A And the switch transistors 30 are PMOS transistors; first transistor T 1 Second transistor T 2 Third transistor T 3 Fourth transistor T 4 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Data transistor T D Pulse width modulation transistor T w Pulse amplitude modulation transistor T A And the control ends of the switch tube 30 are all grid control ends; first transistor T 1 Second transistor T 2 Third transistor T 3 Fourth transistor T 4 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Data transistor T D Pulse width modulation transistor T w Pulse amplitude modulation transistor T A And the first ends of the switch tubes 30 are all sources; first transistor T 1 Second transistor T 2 Third transistor T 3 Fourth transistor T 4 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Data transistor T D Pulse width modulation transistor T w Pulse amplitude modulation transistor T A And the second end of the switching tube 30 is a drain.
In some examples, the above-described pixel driving circuit operates as follows, and includes the following phases:
s10: an initialization stage;
s20: a threshold compensation stage;
s30: a pulse width modulation data storage stage;
s40: a pulse amplitude modulation data storage stage;
s50: and a light emitting stage.
In step S10, please refer to fig. 1 and fig. 2. In the initialization phase (i.e., S10 in FIG. 2), the first transistor T is enabled in response to an initialization signal 1 Third transistor T 3 Sixth transistor T 6 Eighth transistor T 8 The second transistor T is kept on 2 Fourth transistor T 4 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Data transistor T D Cut-off; to the second capacitor C 2 And a fourth capacitor C 4 Charging to make the pulse amplitude modulation transistor T A Satisfy |V gsA |＝V C2 >|V thA I, and pulse width modulationTransistor T W Satisfy |V gsW |＝V C4 >|V thW I, thereby making the pulse amplitude modulation transistor T A And a pulse width modulation transistor T W Remain conductive. Due to supply voltage V SS At a high level, the light emitting device 40 is not lit. Wherein V is gsA For pulse amplitude modulation transistor T A V is the voltage between the base and the source of (2) gsW For pulse width modulation transistor T W V is the voltage between the base and the source of (2) thA For pulse amplitude modulation transistor T A V of (V) gsW For pulse width modulation transistor T W V of (V) C2 Represent C 2 Voltage at both ends, V C4 Represent C 4 The voltage across it.
In step S20, please refer to fig. 1 and fig. 2. In the threshold compensation phase (i.e., phase S20 in fig. 2), the first transistor T is caused to respond to the threshold compensation signal 1 Second transistor T 2 Sixth transistor T 6 Seventh transistor T 7 The third transistor T remains on 3 Fourth transistor T 4 Fifth transistor T 5 Eighth transistor T 8 Data transistor T D Cut-off; initial phase pulse amplitude modulation transistor T A satisfy-V gsA ＝V C2 >|V thA |(V thrA <0) Pulse amplitude modulation transistor T A Conduction, second capacitor C 2 Through the first transistor T 1 Second transistor T 2 And a pulse amplitude modulation transistor T A Discharging until the pulse amplitude modulation transistor T A Cut-off, at this time-V gsA ＝V C2 ＝|V thA I corresponds to the pulse amplitude modulation transistor T A Is stored in the second capacitor C 2 Is a kind of medium. In addition, the initial stage pulse width modulation transistor T W satisfy-V gsW ＝V C4 >|V thW |(V thrW <0) Pulse width modulation transistor T W Conduction, fourth capacitor C 4 Through a sixth transistor T 6 Seventh transistor T 7 And a pulse width modulation transistorT W Discharging until the pulse width modulation transistor T W Cut-off, at this time-V gsW ＝V C4 ＝|V thW I corresponds to the pulse width modulation transistor T W Is stored in the fourth capacitor C4. Due to the supply voltage V at this stage SS At a high level, the light emitting device 40 is not lit.
In step S30, please refer to fig. 1 and fig. 2. In the pulse width modulation data storage phase (i.e., phase S30 in fig. 2), the fourth transistor T is caused to respond to the pulse width modulation data storage signal 4 The first transistor T is kept on 1 Second transistor T 2 Third transistor T 3 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Data transistor T D Cut-off; writing pulse width modulated data voltage to third capacitor C 3 ，V C3 ＝V PWM -V data1 . Wherein V is data1 Representing a pulse width modulated data voltage. Due to the supply voltage V at this stage SS At a high level, the light emitting device 40 is not lit.
In step S40, please refer to fig. 1 and fig. 2. In the pulse amplitude modulation data storage phase (i.e., phase S40 in fig. 2), the data transistor T is caused to respond to the pulse amplitude modulation data storage signal D The first transistor T is kept on 1 Third transistor T 3 Fourth transistor T 4 Fifth transistor T 5 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Cut-off; writing pulse amplitude modulated data voltage into first capacitor C 1 ，V C1 ＝V DD -V data2 . Wherein V is data2 Representing a pulse width modulated data voltage. Due to the supply voltage V at this stage SS At a high level, the light emitting device 40 is not lit.
In step S50, please refer to fig. 1 and fig. 2. In the light-emitting phase (i.e., the S50 phase in FIG. 2), the fifth transistor T is caused to respond to the light-emitting signal 5 On, the first transistor T 1 Third transistorTube T 3 Fourth transistor T 4 Sixth transistor T 6 Seventh transistor T 7 Eighth transistor T 8 Data transistor T D Cut-off; current flows through pulse amplitude control transistor T A And a light emitting device 40, the light emitting device 40 being caused to emit light by the driving of the current. Pulse width control transistor T W On, the pulse amplitude control transistor T will be immediately turned on A The gate voltage of (2) becomes V DD I.e. to enable the pulse-amplitude controlling transistor T A Immediately turn off, so the pulse width control transistor T W The time required from off to on is the real light emitting duration of the light emitting device 40 in the light emitting stage, i.e. the transistor T can be controlled by the pulse width W The driving mode realizing the pulse width drives the light emitting device 40 to emit light.
In some examples, the pixel driving circuit may further control the transistor T by pulse amplitude A The driving mode realizing the pulse amplitude drives the light emitting device 40 to emit light.
Controlling transistor T for pulse amplitude A ，
V gsA ＝-V C2 -V C1 ＝-|V thA |-(V DD -V data2 )＝V data -|V thA |-V DD ，
I＝k(V gs -V th ) 2 ＝k(V gsA +|V thr |) 2 ＝k(V data -|V thA |-V DD +|V thA |) 2 ＝k(V data2 -V DD ) 2 Thus, light is emitted
Device 40 is driven at a current i=k (V data2 -V DD ) 2 Is driven to emit light. Eliminating the pulse amplitude control transistor T A Is set, the influence of the threshold voltage of (a).
Controlling transistor T for pulse width W Pulse width control transistor T in light emitting stage W The voltage at the gate terminal of (2) is:
V gW ＝V PWM -V C3 -V C4 ＝V PWM -|V thW |-(V PWM1 -V data1 )＝V PWM +V data1 -|V thA |-V PWM1 wherein V is PWM1 Represents V PWM Initial voltage at the beginning of the light-emitting phase (i.e. voltage value before the light-emitting phase), T W Just reaching the condition of conduction of V gsW ≤-|V thW I (I); so the pulse width control transistor T W Just reaching the condition of conduction of V PWM +V data1 -|V thA |-V PWM1 -V DD ≤-|V thW I, i.e. V PWM +V data1 -V PWM1 -V DD Less than or equal to 0; due to V PWM1 And V DD Is a fixed value, and V PWM The linearity becomes smaller, so that the transistor T is controlled by the pulse width in the light emitting stage W The time required from off to on (i.e. the pulse width of the light emitting device) depends on V PWM Slope sum V of (2) data1 Value V PWM The slope of (a) depends on the duration of the light-emitting phase (generally unchanged), so the final pulse width controls the transistor T W The time required from off to on depends on V data1 Value, i.e. eliminating the pulse width control transistor T W Is set, the influence of the threshold voltage of (a).
In some examples, the driving current may be set in a range where a wavelength variation of the light emitting device is not significant.
Specifically, referring to fig. 3 (a), the light emitting device in fig. 3 (a) is a blue light emitting diode, and the driving current of the blue light emitting diode is set between 30 and 70, so that the wavelength is limited to the range of 460-465nm (implemented by the driving mode of the pulse amplitude modulation driving), and the gray scale which cannot be implemented in this driving current range can be implemented by the driving mode of the pulse width modulation driving.
Specifically, referring to fig. 3 (b), the light emitting device in fig. 3 (b) is a green light emitting diode, and the driving current of the green light emitting diode is set between 40 and 70, so that the wavelength is limited to the range of 515-520nm (implemented by the driving method of pulse amplitude modulation driving), and the gray scale which cannot be implemented in this driving current range can be implemented by the driving method of pulse width modulation driving.
Specifically, referring to fig. 3 (c), the light emitting device in fig. 3 (c) is a red light emitting diode, and the driving current of the red light emitting diode is set between 10 and 70, so that the wavelength is limited to the range of 630-635nm (realized by the driving mode of pulse amplitude modulation driving), and the gray scale which cannot be realized in this driving current range can be realized by the driving mode of pulse width modulation driving.
Based on the same inventive concept, referring to fig. 4, the present application further provides a display apparatus, including: a plurality of light emitting pixels 100 arranged in a plurality of rows and a plurality of columns, each light emitting pixel 100 including a plurality of light emitting sub-pixels, each light emitting sub-pixel being an independent light emitting device; a plurality of pixel driving circuits according to any one of the above, the pixel driving circuits being connected in one-to-one correspondence with the light emitting sub-pixels; the data driving signal generating circuit 200 serially connects the pixel driving circuits in the same column in sequence for generating the data driving signal V data The method comprises the steps of carrying out a first treatment on the surface of the The scan driving signal generating circuit is used for sequentially connecting the pixel driving circuits positioned in the same row in series to generate a scan driving signal V scan A pulse width luminescence modulation signal; the light emission control signal generating circuit 300 sequentially connects the pixel driving circuits in the same row in series for generating a light emission control signal (i.e. a first light emission control signal K 1 Second light emission control signal K 2 Third light emission control signal K 3 Fourth light emission control signal K 4 Fifth light emission control signal K 5 )。
The pixel driving circuit in the display device drives the light emitting device to emit light by adopting a pulse width modulation driving mode and a pulse amplitude modulation driving mode, so that the change of the wavelength of light caused by the amplitude of driving current flowing in the light emitting diodes with different colors is eliminated, and the influence of the wavelength change on display is further eliminated. In addition, the pixel driving circuit in the display device can eliminate the influence of the threshold voltage of the pulse amplitude control transistor in the pulse amplitude modulation driving mode and eliminate the influence of the threshold voltage of the pulse width control transistor in the pulse width modulation driving mode, so that the image quality of the display panel is improved.
In some examples, the luminescent pixels each include a red subpixel (i.e., the R subpixel in fig. 4), a blue subpixel (i.e., the B subpixel in fig. 4), and a green subpixel (i.e., the G subpixel in fig. 4).
Specifically, the display area includes a plurality of light emitting pixels 100, and each light emitting pixel 100 includes three (a plurality of) sub-pixels R, G, B therein; each sub-pixel adopts a pixel driving circuit shown in fig. 1 to drive light emitting diodes with different colors to emit light. The scan driving signal generating circuit 200 includes a plurality of scan signal lines, each of which supplies a scan driving signal V to one or more light emitting sub-pixels in the display device scan And pulse width light emission control signal V PWM The method comprises the steps of carrying out a first treatment on the surface of the The light emission control signal generation circuit 400 includes a plurality of control signal lines, each of which provides a control signal (i.e., a first light emission control signal K) to one or more light emitting sub-pixels in the display device 1 Second light emission control signal K 2 Third light emission control signal K 3 Fourth light emission control signal K 4 Fifth light emission control signal K 5 ) The method comprises the steps of carrying out a first treatment on the surface of the The data driving signal generating circuit 300 includes a plurality of data driving signal lines, each of which supplies a control data driving signal V to one or more sub-pixels in the display area data 。
In some examples, the display device may be a mobile phone, a tablet, a display, an AR (Augmented Reality ), a television, or a wearable device, which may include, but is not limited to, a smart watch, a smart helmet, or other wearable devices, etc., and thus have the same advantages as the pixel driving circuit provided by any embodiment of the present invention, and are not described herein.
In the description of the present specification, the technical features of the above-described embodiments may be arbitrarily combined, and for brevity of description, all possible combinations of the technical features of the above-described embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description of the present specification.
The above examples merely represent a few embodiments of the present disclosure, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the disclosure, which are within the scope of the disclosure. Accordingly, the scope of protection of the present disclosure should be determined by the following claims.

Claims (10)

1. A pixel driving circuit, comprising: a pulse amplitude modulation driving circuit, a pulse width modulation driving circuit and a switching tube;
the pulse amplitude modulation driving circuit is used for adjusting current flowing through the light emitting device; the pulse amplitude modulation driving circuit comprises a first input end, a second input end, a third input end, a fourth input end, a fifth input end, a sixth input end, a seventh input end and an output end; the first input end of the pulse amplitude modulation driving circuit is connected with a power supply voltage; the second input end of the pulse amplitude modulation driving circuit is connected with the switch tube, the third input end of the pulse amplitude modulation driving circuit is connected with the first light-emitting control signal, the fourth input end of the pulse amplitude modulation driving circuit is connected with the data driving signal, the fifth input end of the pulse amplitude modulation driving circuit is connected with the scanning driving signal, the sixth input end of the pulse amplitude modulation driving circuit is connected with the third light-emitting control signal, the seventh input end of the pulse amplitude modulation driving circuit is connected with the second light-emitting control signal, and the output end of the pulse amplitude modulation driving circuit is connected with the light-emitting device;
The pulse width modulation driving circuit is connected with the pulse amplitude modulation driving circuit through the switching tube and is used for controlling the light emitting time of the light emitting device.
2. The pixel driving circuit according to claim 1, wherein the pulse amplitude modulation driving circuit includes:
the first transistor comprises a control end, a first end and a second end, wherein the control end of the first transistor is connected with the first light-emitting control signal, and the first end of the first transistor is connected with the power supply voltage;
the second transistor comprises a control end, a first end and a second end, the control end of the second transistor is connected with the second light-emitting control signal, and the second end of the second transistor is connected with the light-emitting device;
a third transistor including a control terminal, a first terminal, and a second terminal, the control terminal of the third transistor being connected to the third light emission control signal, the first terminal of the third transistor being connected to the first light emission control signal;
the data transistor comprises a control end, a first end and a second end, wherein the control end of the data transistor is connected with the scanning driving signal, the first end of the data transistor is connected with the data driving signal, and the second end of the data transistor is connected with the second end of the first transistor;
The control end of the pulse amplitude modulation transistor is connected with the second end of the third transistor and the first end of the second transistor to jointly form a second input end of the pulse amplitude modulation driving circuit, the first end of the pulse amplitude modulation transistor is connected with the power supply voltage, the second end of the pulse amplitude modulation transistor is connected with the second end of the second transistor, and the output end of the pulse amplitude modulation driving circuit is connected with the light emitting device;
one end of the first capacitor is connected with the power supply voltage, and the other end of the first capacitor is connected with the second end of the first transistor and the second end of the data transistor;
and one end of the second capacitor is connected with the second end of the first transistor and the second end of the data transistor, and the other end of the second capacitor is connected with the control end of the pulse amplitude modulation transistor, the second end of the third transistor and the first end of the second transistor.
3. The pixel driving circuit according to claim 1, wherein the PWM driving circuit comprises a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, an eighth input terminal, and an output terminal, wherein,
the first input end of the pulse width modulation driving circuit is connected with the power supply voltage, the second input end of the pulse width modulation driving circuit is connected with a pulse width light emitting modulation signal, the third input end of the pulse width modulation driving circuit is connected with a fourth light emitting control signal, the fourth input end of the pulse width modulation driving circuit is connected with the data driving signal, the fifth input end of the pulse width modulation driving circuit is connected with the first light emitting control signal, the sixth input end of the pulse width modulation driving circuit is connected with the third light emitting control signal, the seventh input end of the pulse width modulation driving circuit is connected with the second light emitting control signal, the eighth input end of the pulse width modulation driving circuit is connected with the first light emitting control signal, and the output end of the pulse width modulation driving circuit is connected with the switch tube.
4. A pixel drive circuit according to claim 3, wherein the pulse width modulation drive circuit comprises:
the control end of the fourth transistor is connected with the fourth light-emitting control signal, and the first end of the fourth transistor is connected with the data driving signal;
a sixth transistor including a control terminal, a first terminal, and a second terminal, the control terminal of the sixth transistor being connected to the first light emission control signal, the first terminal of the sixth transistor being connected to the power supply voltage;
a seventh transistor including a control terminal, a first terminal, and a second terminal, the control terminal of the seventh transistor being connected to the second light emission control signal, the second terminal of the seventh transistor being connected to the switching transistor;
an eighth transistor, the eighth transistor including a control terminal, a first terminal, and a second terminal, the control terminal of the eighth transistor being connected to the third light emission control signal, the first terminal of the eighth transistor being connected to the first light emission control signal;
The control end of the pulse width modulation transistor is connected with the first end of the seventh transistor and the second end of the eighth transistor, the first end of the pulse width modulation transistor is connected with the power supply voltage, and the second end of the pulse width modulation transistor and the second end of the seventh transistor are used as the output end of the pulse width modulation driving circuit to be connected with the switch transistor;
one end of the third capacitor is connected with the pulse width modulation signal, and the other end of the third capacitor is connected with the second end of the fourth transistor and the second end of the sixth transistor;
and one end of the fourth capacitor is connected with the third capacitor, the second end of the fourth transistor and the second end of the sixth transistor, and the other end of the fourth capacitor is connected with the control end of the pulse width modulation transistor, the first end of the seventh transistor and the second end of the eighth transistor.
5. The pixel driving circuit according to claim 1, wherein the switching tube comprises a fifth transistor, the switching tube comprising a control terminal, a first terminal, and a second terminal; the control end of the switching tube is connected with a fifth light-emitting control signal, the first end of the switching tube is connected with the output end of the pulse width modulation driving circuit, and the second end of the switching tube is connected with the second input end of the pulse amplitude modulation driving circuit.
6. The pixel driving circuit according to claim 5, wherein the light emitting device comprises a light emitting diode, an anode of the light emitting diode is connected to an output terminal of the pulse amplitude modulation driving circuit, and a cathode of the light emitting diode is grounded.
7. A pixel driving circuit according to claim 2, 4 or 5, wherein each transistor comprises a PMOS transistor, the control terminal of each transistor being a gate, the first terminal of each transistor being a source, and the second terminal of each transistor being a drain.
8. A display device, comprising:
a plurality of light emitting pixels arranged in a plurality of rows and a plurality of columns, each of the light emitting pixels including a plurality of light emitting sub-pixels, each of the light emitting sub-pixels serving as an independent light emitting device;
a plurality of pixel driving circuits according to any one of claims 1 to 7, which are connected in one-to-one correspondence with the light emitting sub-pixels;
the data driving signal generating circuit is used for sequentially connecting the pixel driving circuits positioned in the same column in series and generating data driving signals;
the scanning driving signal generating circuit is used for sequentially connecting the pixel driving circuits positioned in the same row in series and generating a scanning driving signal and a pulse width luminescence modulation signal;
And the pixel driving circuits positioned in the same row are sequentially connected in series by the light-emitting control signal generating circuit, and are used for generating light-emitting control signals.
9. The display device of claim 8, wherein the light emitting pixels each comprise a red subpixel, a blue subpixel, and a green subpixel.
10. The display apparatus of claim 8, wherein the display apparatus comprises a cell phone, a tablet, a display, an AR, or a wearable device.
CN202210423015.3A 2022-04-21 2022-04-21 Pixel driving circuit and display device Pending CN116978313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210423015.3A CN116978313A (en) 2022-04-21 2022-04-21 Pixel driving circuit and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210423015.3A CN116978313A (en) 2022-04-21 2022-04-21 Pixel driving circuit and display device

Publications (1)

Publication Number Publication Date
CN116978313A true CN116978313A (en) 2023-10-31

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