Scanning Line Capacitance Compensation for L-Shaped LCD Panels
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Solution Overview
Problem
Liquid crystal display panels with non-rectangular shapes, such as L-shapes or concave shapes, face challenges in uniformizing display characteristics due to varying numbers of pixels per wiring, leading to signal delay differences that cause luminance unevenness and flicker, which are difficult to address with conventional techniques.
Innovation Solution
The solution involves adding capacitance to the first scanning lines in the peripheral region of the panel, where the number of pixels is smaller, to compensate for differences in wiring resistance and capacitance, thereby uniformizing display characteristics and preventing luminance unevenness and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the panel shape is changed to non-rectangular (L-shape or concave shape), then the display device can meet heterogeneous display requirements, but the number of pixels per wiring varies discontinuously causing signal delay differences and luminance unevenness
Solution Approach 1:
The patent applies local quality by adding compensation capacitance specifically to scanning lines in regions where the number of pixels varies discontinuously. Instead of uniform treatment across all scanning lines, the invention identifies specific lines (particularly in L-shaped or concave regions) that require additional capacitance to compensate for their shorter lengths and fewer pixel connections, thereby maintaining uniform display characteristics across the heterogeneous panel shape.
2Shape
If the number of pixels per scanning line varies among wirings, then heteromorphic panel shapes can be achieved, but capacitance and resistance differences generate signal delay that influences pixel potential and causes luminance unevenness
Solution Approach 1:
The patent applies parameter changes by modifying the capacitance parameter of specific scanning lines. By adding compensation capacitance to scanning lines with fewer pixels (typically in L-shaped or concave regions), the invention adjusts the electrical parameters to compensate for variations in line length and pixel count, thereby equalizing signal delay across all scanning lines despite the heterogeneous panel shape.
3Manufacturing precision
If conventional correction techniques are used to adjust wiring capacitance, then some signal delay issues can be addressed, but layout is hardly performed when the display panel has L-shape or concave shape with discontinuous pixel number changes
Solution Approach 1:
The patent simplifies the layout process by applying local quality - adding capacitance only where needed rather than performing complex global optimization. The compensation capacitance is strategically placed on specific scanning lines in L-shaped or concave regions where the pixel count varies discontinuously, avoiding the need for complex layout adjustments while achieving effective signal delay correction.
Data Source
AI summary
In the case that a first scanning line having a smaller number of pixels to be driven than that of a second scanning line in a display device having a heteromorphic display region, capacitance is added to an extended scanning line in which the first scanning line extends to an outside of the display region. A large difference in RC delay between scanning lines generated by the number of pixels to be driven can be compensated for by adding the capacitance, so that luminance unevenness can be prevented to contribute to improvement of display quality.