Pixel Driving Circuit With Variable Pulse Width Luminance Control
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Solution Overview
Problem
Existing display devices face challenges in achieving improved display quality through optimized pixel driving and luminance control, particularly in managing luminance values and pulse widths across multiple frames.
Innovation Solution
A display device with a pixel driving circuit that includes specific transistors and capacitors, allowing for varying pulse widths and luminance values across frames, enabling progressive luminance adjustments through different operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pixel driving circuit uses a fixed luminance signal pulse width across all frames, then the circuit structure is simple, but the display quality and luminance efficiency cannot be optimized
Solution Approach 1:
The patent applies dynamics by making the luminance signal pulse width variable across different frames rather than fixed. The driving circuit dynamically adjusts the pulse width of the luminance signal applied to the luminance transistor based on the frame number, enabling progressive luminance changes from first to second luminance values while maintaining circuit structural simplicity.
2Manufacturing precision
If the luminance signal pulse width is varied across frames to improve display quality, then display quality improves, but the control complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the pulse width parameter of the luminance signal across different frames. The control mechanism changes the temporal parameter (pulse width) of the luminance signal to achieve progressive luminance transitions, improving display quality without requiring complex additional circuitry beyond a controller capable of generating variable pulse widths.
3Use of energy by moving object
If progressive luminance changes are implemented across multiple frames, then luminance efficiency improves, but the response time and frame synchronization become more complex
Solution Approach 1:
The patent applies periodic action by implementing progressive luminance changes at regular frame intervals. The luminance signal pulse width is systematically varied across sequential frames (first frame, second frame, etc.), creating a periodic pattern of luminance transitions that improves luminance efficiency while maintaining frame synchronization through regular timing cycles.
Data Source
AI summary
A display device includes a display panel driven in units of frames and include a pixel including a pixel driving circuit and a light-emitting element. The pixel driving circuit may include a first driving sub-transistor, a second driving sub-transistor, and a luminance transistor. The first driving sub-transistor includes a first electrode connected to a first node and a gate electrode connected to a second node. The second driving sub-transistor includes a gate electrode connected to the second node. The luminance transistor includes a first electrode connected to the first node, a second electrode connected to a third node, and a gate electrode which receives a luminance signal. The frame may include a first frame and a second frame, and the luminance signal may be activated in the first frame to have a first pulse width and may be activated in the second frame to have a second pulse width.