Array Substrate Overlap Structure for Aperture and Luminance Control
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Solution Overview
Problem
In display devices, the arrangement of wiring lines and electrodes can lead to a decrease in pixel aperture ratio and uneven display luminance due to the need for a wide blocking portion to prevent short circuits, which also affects the touch panel functionality.
Innovation Solution
The array substrate design includes specific configurations of common electrodes, pixel electrodes, switching elements, and wiring lines, with overlapping portions and conductive films to manage electrical fields and potential fluctuations, ensuring the pixel aperture ratio is maintained and display luminance is uniform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking portion is provided at a position overlapping the second pixel wiring line to prevent short circuits, then the reliability of preventing short circuits is improved, but the aperture ratio of the pixel is decreased
Solution Approach 1:
The patent introduces an overlapping portion in the vertical dimension (stacking direction) to achieve electrical field blocking. Instead of expanding the blocking portion horizontally which would reduce aperture ratio, the patent stacks the overlapping portion above the pixel wiring line at a different vertical level, blocking the electrical field in the vertical dimension while maintaining horizontal aperture.
Solution Approach 2:
The overlapping portion acts as an intermediary structure between the pixel wiring line and the common electrode. It provides electrical field blocking functionality without requiring direct horizontal expansion that would encroach on the pixel aperture area, thus mediating between reliability requirements and aperture ratio constraints.
2Reliability
If the light blocking range is widened to prevent structure near the blocking portion from being visually recognized, then the reliability of preventing visual recognition of structures is improved, but the aperture ratio of the pixel is decreased
Solution Approach 1:
The light blocking function is achieved in the vertical dimension through the overlapping portion's position above the pixel wiring line. This eliminates the need to widen the horizontal light blocking range, as the vertical stacking arrangement provides sufficient optical shielding without encroaching on the horizontal aperture area.
3Area of stationary object
If measures are taken to prevent the decrease in the aperture ratio of the pixel, then the aperture ratio is maintained, but unevenness is generated in the display luminance
Solution Approach 1:
The overlapping portion is strategically positioned only where needed - specifically above the pixel wiring line where electrical field interference occurs. This localized arrangement provides necessary field blocking without creating excessive horizontal structures that would cause luminance unevenness, achieving both aperture ratio maintenance and display uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents a reduction in pixel aperture ratio and minimizes unevenness in display luminance, enhancing the overall display quality and touch sensitivity.
Implementation Method 1
The first common electrode is disposed overlapping the first pixel electrode, the second pixel electrode, the third pixel electrode, the first wiring line, and at least the first semiconductor portion of the first switching element. The second common electrode is disposed overlapping the fourth pixel electrode and the second wiring line.
Data Source
AI summary
In an array substrate, a plurality of wiring lines include a first wiring line located between a first pixel electrode and a second pixel electrode in a first direction, and a second wiring line located between a third pixel electrode and a fourth pixel electrode in the first direction. A plurality of switching elements include a first switching element and a second switching element. A plurality of common electrodes include a first common electrode overlapping the first pixel electrode, the second pixel electrode, the third pixel electrode, the first wiring line, and a first semiconductor portion, and a second common electrode overlapping the fourth pixel electrode and the second wiring line. Further, there is provided a first overlapping portion that is disposed overlapping a second semiconductor portion and has the same potential as that of any of the plurality of common electrodes.