Electro-optic Apparatus Wiring Resistance Equalization
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Solution Overview
Problem
The increase in the number of pixels in electro-optic panels leads to longer wiring lengths, causing resistance differences among terminals, which degrades display quality, especially in downsized and high-resolution devices.
Innovation Solution
The solution involves configuring the electro-optic apparatus with terminals and wirings where the resistance differences due to wiring lengths are minimized by adjusting the widths of both the wirings and terminals, and using dummy wirings to equalize capacitance variations, thereby reducing display quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of pixels is increased to achieve higher resolution, then the display quality is improved, but the wiring length increases causing resistance differences that degrade display quality
Solution Approach 1:
The patent applies local quality by making the wiring width variable rather than uniform. Specifically, the wiring width is increased in regions where the wiring length is longer to compensate for the increased resistance, thereby maintaining consistent electrical characteristics across different pixel regions. This localized adjustment of wiring dimensions resolves the contradiction between high resolution (requiring more pixels) and display quality (degraded by resistance differences from long wirings).
2Quantity of substance
If terminals are mounted across multiple rows to increase the number of terminals, then the terminal capacity is improved, but the wiring length differences among terminals increase causing display quality degradation
Solution Approach 1:
The patent implements local quality by assigning different wiring widths to terminals based on their specific positions and wiring lengths. Terminals in rows with longer wiring paths are assigned wider wirings to reduce resistance, while terminals with shorter paths use narrower wirings. This position-dependent wiring width adjustment compensates for the inherent wiring length differences that arise from mounting terminals across multiple rows, thereby maintaining uniform electrical characteristics despite the increased number of terminals.
3Volume of moving object
If the electro-optic apparatus is downsized to improve portability, then the device compactness is improved, but the wiring length relative to pixel size increases causing resistance differences
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the wiring width parameter based on the actual wiring length and position. In downsized devices where wiring lengths become significant relative to pixel dimensions, the wiring width is increased to reduce resistance. This parameter adjustment compensates for the scaling effects of downsizing, ensuring that resistance differences do not degrade display quality even when the overall device dimensions are reduced.
Data Source
AI summary
An electro-optic apparatus includes an element substrate, a pixel region including a first and second pixel formed on the element substrate, a first terminal formed on the element substrate, a second terminal formed on the element substrate, located opposite of the pixel region with the first terminal being interposed between the pixel region and the second terminal, a first wiring extending from the first terminal included in a path for transmitting to the first pixel, a first signal having been input to the first terminal and a second wiring extending from the second terminal included in a path for transmitting to the second pixel, a second signal having been input to the second terminal. Further, a difference between a resistance of the path for transmitting the first and second signal is made smaller than a resistance difference due to a difference between a length of the first and second wiring.