Liquid Crystal Display Pixel Electrode Boundary Design
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Solution Overview
Problem
Liquid crystal display devices with non-rectangular shapes face challenges in maintaining display quality and reliability due to differences in pixel capacitance ratios at the boundary between the display region and the frame region, leading to luminance variations and potential liquid crystal deterioration.
Innovation Solution
The design involves pixel electrodes with smaller sizes at the boundary portion between the display and frame regions, with a configuration where the pixel electrodes are entirely within the display region, and the use of a light blocking film and subpixel electrodes to minimize protrusion into the frame region, ensuring consistent voltage application and reduced frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel electrodes are made smaller at the boundary portion between display region and frame region, then frame region size is reduced, but pixel capacitance ratio becomes inconsistent leading to luminance variations
Solution Approach 1:
The patent applies local quality by making pixel electrodes at the boundary portion smaller than those in the interior portion. This local differentiation allows the frame region to be narrowed while maintaining adequate display area in the center. The smaller boundary pixel electrodes reduce the protrusion into the frame region, achieving frame narrowing without requiring uniform reduction of all pixel electrodes.
Solution Approach 2:
The patent changes the size parameter of pixel electrodes based on their location. Pixel electrodes in the interior portion maintain a first size, while pixel electrodes at the boundary portion are made smaller with a second size. This parameter change allows optimization of frame region area while managing the effects on pixel capacitance ratio and luminance consistency through controlled local variations.
2Area of stationary object
If pixel electrodes entirely within display region are used, then frame narrowing is achieved, but defective region increases leading to insufficient display
Solution Approach 1:
The patent applies local quality by differentiating pixel electrode sizes between interior and boundary portions. By making only boundary pixel electrodes smaller rather than all pixel electrodes, the patent maintains adequate display coverage in the interior region while achieving frame narrowing at the boundaries. This localized approach prevents excessive defective regions.
Solution Approach 2:
The patent applies partial action by reducing the size of pixel electrodes only at the boundary portion rather than uniformly across all pixels. This partial reduction is sufficient to achieve frame narrowing while maintaining adequate display performance in the interior region, avoiding the need for excessive frame region expansion that would be required if all pixel electrodes were uniformly reduced.
3Area of stationary object
If different pixel sizes are used at boundary and interior portions, then frame region can be narrowed, but pixel capacitance ratio differences cause luminance variations
Solution Approach 1:
The patent accepts local quality differences in pixel electrode sizes as necessary to achieve frame narrowing. The smaller boundary pixel electrodes create local variations in pixel capacitance ratio, which the patent manages through overall design considerations rather than attempting complete uniformity. This local differentiation is the trade-off accepted to achieve the primary goal of frame narrowing.
Solution Approach 2:
The patent deliberately changes the size parameter of pixel electrodes at the boundary portion to achieve frame narrowing. This parameter change inherently creates differences in pixel capacitance ratio and luminance characteristics between boundary and interior portions. The patent manages these variations through the overall pixel electrode design rather than attempting to maintain complete uniformity.
Data Source
AI summary
A plurality of pixel electrodes each forming one pixel are provided on a TFT substrate. A size of a pixel electrode located at a boundary portion between a non-rectangular active area and a frame region, which is an area outside the active area, is smaller than a size of a pixel electrode not located at the boundary portion. In such a configuration, a voltage is always applied to the plurality of pixel electrodes.