Pixel Compensation Circuit for Narrow Bezel Displays
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Solution Overview
Problem
Existing pixel compensation circuits for current-mode driving elements in display technology, such as OLED and Micro LED, face challenges in compensating for threshold voltage differences between driving transistors, especially at low gray scale levels, which can lead to brightness inconsistencies. Additionally, these circuits often require complex driving systems and multiple scanning signal lines, increasing the bezel width of display products.
Innovation Solution
A pixel compensation circuit is proposed that includes a compensation transistor, a driving transistor, a reset transistor, switching transistors, capacitors, and a light-emitting device. This circuit uses a simplified structure with fewer scanning signal lines, allowing for effective threshold voltage compensation through specific timing control stages during reset, detection, data writing, and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If internal compensation method is used, then device complexity is reduced and cost is lowered, but compensation range of threshold voltage is limited
Solution Approach 1:
The patent implements dynamic threshold voltage compensation by using a compensation transistor that can adjust the threshold voltage of the driving transistor in real-time based on detected voltage differences. The compensation transistor dynamically modifies the gate voltage of the driving transistor to compensate for threshold voltage variations, enabling the system to adapt to different compensation ranges while maintaining simple circuit structure.
2Reliability
If nTnC pixel circuit structure is used, then threshold voltage compensation is achieved, but number of scanning signal lines is increased
Solution Approach 1:
The patent merges the compensation function with the existing pixel circuit structure by integrating the compensation transistor and capacitors into the standard 3T1C configuration. The compensation circuit shares the same scanning signal lines and data lines as the normal pixel circuit, eliminating the need for separate scanning signal lines for compensation operations. This merging approach maintains compensation effectiveness while reducing the number of scanning signal lines required.
3Reliability
If multiple sets of GOA driving circuits are used, then compensation function is achieved, but bezel width is increased
Solution Approach 1:
The patent makes the existing GOA driving circuits universal by enabling them to perform both normal pixel driving and threshold voltage compensation functions using the same circuit structure and signal lines. The compensation transistor and capacitors are integrated into the pixel circuit itself, allowing the driving circuit to handle compensation tasks without requiring separate dedicated circuits. This multi-functionality reduces the overall circuit area and minimizes bezel width while maintaining compensation capability.
Data Source
AI summary
The present application provides a pixel compensation circuit, a method of compensating pixel, and a display panel. The pixel compensation circuit includes a compensation transistor, a driving transistor, a reset transistor, a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, and a light-emitting device. Compared with the pixel compensation circuit in prior art, the present application does not need to adopt a plurality of array substrate gate driving circuit to achieve compensation function. That is, the scanning signal lines adopted by the present application are less, which is convenient to achieve narrow bezel of display products.