A pixel driving circuit, active electroluminescence display and driving method

A pixel driving circuit and electroluminescence technology, applied in static indicators, instruments, etc., can solve the problems of limited grayscale, MicroLED color shift, wrong contour, etc., and achieve the effect of large PWM pulse width

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although some people in the prior art have proposed an active driving scheme for Micro LED based on PWM (Pulse Width Modulation), for the active digital PWM driving scheme, since the grayscale is represented by the molecular frame method, it can represent The number of grayscales is limited and produces false contours
For the active analog PWM driving scheme, since the slope setting of the slope control signal is relatively small, the rise time or fall time of the generated PWM signal is relatively long, which makes the Micro LED display at low gray levels produce color shift, Uneven brightness, etc.

Method used

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  • A pixel driving circuit, active electroluminescence display and driving method
  • A pixel driving circuit, active electroluminescence display and driving method
  • A pixel driving circuit, active electroluminescence display and driving method

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Experimental program
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Embodiment 1

[0054] like image 3 As shown, the structure of an active electroluminescent display is basically composed of a pixel array part Pixel, a scan driver Scan, a data input driver DATA, and a data input driver ba. The pixel array components are connected to the scan lines SCAN arranged in rows, the first data signal lines and the second data signal lines arranged in columns, and the pixel array components also include a plurality of power lines for providing the necessary power for the pixel operation. Low-potential power supply VSS and high-potential power supply VDD. The first data signal line required for the operation of the pixel is used to control the pulse width of the PWM signal, the second data signal line is used to control the output current of the current source, the low-potential power supply VSS is also used for grounding, and the high-potential power supply VDD is used to supply the The pixel provides power supply, the first data signal line is the output of the da...

Embodiment 2

[0083] like image 3 As shown, the structure of the active electroluminescent display of this embodiment 2 basically consists of a pixel array component Pixel, a scan driver Scan, a data input driver DATA, and a data input driver ba. The pixel array components are all connected to the scan lines SCAN arranged in rows, the first data signal lines and the second signal data lines arranged in columns, and the pixel array components also include a plurality of power lines for providing the necessary power for the pixel operation. Low-potential power supply VSS and high-potential power supply VDD. The first data signal line required for the operation of the pixel is used to control the pulse width of the PWM signal, the second data signal line is used to control the output current of the current source, the low-potential power supply VSS is also used for grounding, and the high-potential power supply VDD is used to supply the The pixel provides the power supply.

[0084] The disp...

Embodiment 3

[0098] like Figure 8 As shown, the structure of an active electroluminescent display in this embodiment 3 basically consists of a pixel array component Pixel, a scan driver Scan, a data input driver DATA, and a data input driver ba. The pixel array components are connected to the scan lines SCAN arranged in rows, the first data signal lines and the second data signal lines arranged in columns, and the pixel array components also include a plurality of power lines for providing the necessary power for the pixel operation. Low-potential power supply VSS and high-potential power supply VDD. The first data signal line required for the operation of the pixel is used to control the pulse width of the PWM signal, the second data signal line is used to control the output current of the current source, the low-potential power supply VSS is also used for grounding, and the high-potential power supply VDD is used to supply the The pixel provides power supply, the first data signal line...

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Abstract

The invention discloses a pixel driving circuit, an active electroluminescent display and a driving method, including a light emitting element; a current source, including a driving transistor connected to the light emitting element, and feeding the current source according to the voltage applied to the gate terminal of the driving transistor. The light-emitting element provides driving currents with different amplitudes; the current control circuit is connected with the current source, and is used to provide voltages of different levels to the gate terminal of the drive transistor; the PWM generating circuit is used to generate PWM pulses for controlling the conduction time of the light-emitting element signal; a shaping circuit, used to shape the PWM pulse signal; a PWM control circuit, based on the above shaped PWM pulse signal and the output voltage of the current control circuit, to obtain the duration for controlling the driving current of the light-emitting element. In the present invention, the ramp signal is input after the scanning control signal of each row is input, and a larger PWM pulse width can be realized.

Description

technical field [0001] The invention relates to the field of optoelectronic display, in particular to a pixel driving circuit, an active electroluminescence display and a driving method. Background technique [0002] Compared with traditional liquid crystal display (LCD) and organic light emitting diode display (OLED), micro light emitting diode (MicroLED) display technology is known for its display advantages of high brightness, high contrast, wide color gamut, long life, and nanosecond response speed. for the ultimate display technology. However, the current Micro LED display technology has encountered some technical challenges, including chip manufacturing, mass transfer, monolithic integration technology, color realization scheme, driver circuit design, etc. Compared with OLED, Micro LED has very steep I-V characteristics, and the luminous efficiency decreases at low current density, and it will cause the problem of color shift of Micro LED under different current drivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3225
CPCG09G3/32G09G3/3225
Inventor 吴为敬邹培安刘淳徐延港梅相霖徐苗王磊彭俊彪
Owner SOUTH CHINA UNIV OF TECH
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