Pixel Circuit Voltage Provider for Luminance Uniformity
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Solution Overview
Problem
Pixel circuits face challenges in maintaining luminance uniformity under low grayscale display conditions due to variations in transistor threshold voltage, leading to uneven luminance across the display panel.
Innovation Solution
The pixel circuit includes a driving current generator, a pulse width signal generator, and a voltage provider, where the voltage provider adjusts the control signal to accelerate the turn-on speed of the output switch, ensuring timely provision of the pulse width signal and driving current to the lighting component, thereby maintaining consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pulse width modulation technology is used to adjust luminance by reducing action time of driving current, then luminance can be reduced under low grayscale conditions, but the pulse width signal may not provide large enough width due to transistor threshold voltage variation, resulting in insufficient luminance
Solution Approach 1:
The patent changes the voltage parameter of the control signal dynamically. The voltage provider adjusts the control signal voltage based on the data write-in signal and pulse width modulation enable signal, ensuring the output switch turns on quickly regardless of transistor threshold voltage variations, thereby maintaining reliable luminance output
Solution Approach 2:
The patent introduces a voltage provider as an intermediary component between the control signal source and the output switch. This intermediary adjusts the control signal voltage to compensate for transistor threshold voltage variations, ensuring consistent switch turn-on behavior and maintaining luminance uniformity across different pixels
2Use of energy by moving object
If the control signal voltage is low, then power consumption is reduced, but the turn-on speed of the output switch is slow, causing delayed pulse width signal delivery
Solution Approach 1:
The patent makes the control signal voltage dynamic rather than static. The voltage provider adjusts the control signal voltage based on operational conditions (data write-in signal and pulse width modulation enable signal), allowing the system to use higher voltage temporarily for fast switch turn-on when needed, then return to lower voltage for power saving, achieving both speed and energy efficiency
Data Source
AI summary
A display panel and a pixel circuit thereof are provided. The pixel circuit includes a driving current generator, a pulse width signal generator, a voltage provider, and a current enabler. The driving current generator provides a driving current. The pulse width signal generator includes an output switch. The output switch is controlled by a control signal, and provides a pulse width signal according to the control signal. The voltage provider adjusts the control signal according to a data write-in signal and a pulse width modulation enable signal. The current enabler provides the driving current to a lighting component according to the pulse width signal and an amplitude modulation enable signal.