LCD Pixel Wiring Layout for Longer Charging Time in Fast Scanning
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in ensuring sufficient charging time for pixels, particularly in high-speed and large high-definition panels, where the horizontal period is short and charging time is insufficient.
Innovation Solution
The display device employs a configuration where four gate wirings are turned on simultaneously, allowing four pixels in a column to be charged by four source wirings, thereby extending the horizontal period and ensuring sufficient charging time by uniformly distributing the source wiring resistance and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If one gate wiring is turned on one row at a time with one source wiring, then the device complexity is low, but the charging time of pixels is insufficient in high-speed driving panels
Solution Approach 1:
The patent divides the pixel array into multiple segments (first pixel, second pixel, third pixel) arranged in the first direction, with each pixel independently chargeable through separate source wirings. This segmentation allows simultaneous charging of multiple pixels, effectively extending the charging time window within the horizontal period for high-speed driving panels.
Solution Approach 2:
The patent combines multiple source wirings (first source wiring, second source wiring, third source wiring) to simultaneously charge multiple pixels. By merging the charging functions into parallel pathways, the system achieves sufficient charging time for all pixels within the constrained horizontal period, resolving the contradiction between charging duration and scanning speed.
2Duration of action of moving object
If multiple source wirings are used to charge pixels simultaneously, then the charging time is sufficient, but the source wiring resistance and capacitance distribution becomes uneven
Solution Approach 1:
The patent applies local quality by arranging pixels and source wirings such that each pixel is positioned between specific source wirings (first pixel between first and second source wirings, second pixel between second and third source wirings, third pixel between first and third source wirings). This localized configuration ensures uniform resistance and capacitance distribution across different pixel locations, maintaining manufacturing precision while enabling simultaneous charging.
3Speed
If the horizontal period is shortened for high-speed driving, then the scanning speed increases, but the charging time becomes insufficient
Solution Approach 1:
The patent implements continuity of useful action by enabling simultaneous charging of multiple pixels through multiple source wirings operating in parallel. This continuous parallel charging process ensures that all pixels receive sufficient charge within the shortened horizontal period, maintaining high scanning speed without sacrificing charging completeness.
Data Source
AI summary
A display device includes a first pixel, a second pixel, and a third pixel arranged in a first direction in a display area arranged on a first substrate, a first source wiring, a second wiring, and a third wiring extending in the first direction, and connected to each of the first pixel to the third pixel, and a first gate wiring, a second gate wiring, and a third wiring intersecting the first direction, and connected to each of the first pixel to the third pixel. The first pixel includes a first transistor electrically connected to the first gate wiring and the first source wiring and a liquid crystal element electrically connected to the first transistor, the first pixel to the third pixel are arranged between the first source wiring and the third source wiring, and the second source wiring, and the first source wiring intersects the third source wiring.