Pixel Driving Circuit Voltage Control for Color Shift Prevention
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Solution Overview
Problem
Conventional pixel driving circuits require high processing speed and increased manufacturing costs due to the need for multiple full scans in one frame to control luminance and prevent color shift in lighting devices, which is inefficient and costly.
Innovation Solution
A pixel driving circuit with a driving transistor, data writing module, first control module, compensation module, and storage module that writes a first power voltage into a node when the control signal exceeds a threshold voltage, preventing color shift without the need for pulse width modulation, thus reducing chip performance requirements and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pulse width modulation is used to control luminance and prevent color shift, then color shift is prevented, but the chip needs to perform multiple full scans in one frame which shortens scan time and increases manufacturing cost
Solution Approach 1:
The patent changes the voltage parameter by writing a first power voltage into a first node when a control signal exceeds a threshold voltage. This voltage control mechanism prevents color shift without requiring multiple scans, thereby reducing manufacturing cost while maintaining color accuracy
Solution Approach 2:
The patent performs preliminary action by pre-writing the first power voltage into the first node before lighting operation. This preliminary voltage setup enables color shift prevention without needing multiple scans during operation, reducing both time and cost requirements
2Manufacturing precision
If pulse width modulation is used to control luminance and prevent color shift, then color shift is prevented, but the chip needs to perform multiple full scans in one frame which shortens scan time
Solution Approach 1:
The patent changes the voltage parameter by writing a first power voltage into a first node when a control signal exceeds a threshold voltage. This voltage control mechanism prevents color shift without requiring multiple scans, thereby reducing manufacturing cost while maintaining color accuracy
Solution Approach 2:
The patent performs preliminary action by pre-writing the first power voltage into the first node before lighting operation. This preliminary voltage setup enables color shift prevention without needing multiple scans during operation, reducing both time and cost requirements
3Manufacturing precision
If conventional pixel driving circuit is used with multiple scans, then color shift is prevented, but chip performance requirements increase
Solution Approach 1:
The patent changes the voltage parameter by writing a first power voltage into a first node when a control signal exceeds a threshold voltage. This voltage control mechanism prevents color shift without requiring multiple scans, thereby reducing manufacturing cost while maintaining color accuracy
Solution Approach 2:
The patent performs preliminary action by pre-writing the first power voltage into the first node before lighting operation. This preliminary voltage setup enables color shift prevention without needing multiple scans during operation, reducing both time and cost requirements
Data Source
AI summary
A pixel driving circuit, a display panel and a display device are provided. The pixel driving circuit includes a first control module electrically connected to a first node. The first control module receives the first control signal and the first power voltage. The first control module is used to write the first power voltage into the first node under the control of the first control signal when the voltage of the first control signal is higher than the first predetermined threshold voltage. Because the first power voltage is written into the first node to control the lighting device to generate light when the first control signal is higher than the first predetermined threshold voltage, this could prevent the lighting device from generating the color shift. In this way, the requirement for the chip performance is comparatively low and thus the manufacturing cost is reduced.