Memory-in-Pixel Overdriving for High-Resolution LCD Refresh Rates
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Solution Overview
Problem
High-resolution and large-screen LCDs face challenges in maintaining smooth video motion while adhering to the 60 Hz refresh rate, as increasing pixel count requires longer gate selection times, limiting the number of implementable gate lines and affecting video sharpness.
Innovation Solution
The method involves an indirect driving approach where gate lines can operate in different modes simultaneously, decoupling gate selection time from pixel load time, allowing multiple gate lines to be updated within the same gate selection interval by driving pixel information from a source line to a liquid crystal element, then to a memory element, and finally from the memory element back to the liquid crystal element within the same time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel count is increased to achieve high resolution and large screen, then the display quality is improved, but the gate selection time increases causing the refresh rate to drop below 60 Hz
Solution Approach 1:
The patent applies preliminary action by pre-loading pixel information into the memory element during the first part of the gate selection time, before the liquid crystal element needs to be updated. This allows the memory to be ready with the next frame's data while the liquid crystal is still displaying the current frame, enabling parallel preparation and display operations that maintain 60 Hz refresh rate even with increased pixel counts
Solution Approach 2:
The patent ensures continuity of useful action by overlapping the gate selection time with the pixel load time. While the liquid crystal element is being updated during one gate selection interval, the memory element is simultaneously being loaded with the next frame's pixel information. This continuous overlapping of operations eliminates idle time and maintains the 60 Hz refresh rate requirement
2Productivity
If the gate selection time is extended to accommodate more pixels, then the number of implementable gate lines increases, but the pixel load time becomes the limiting factor
Solution Approach 1:
The patent applies segmentation by dividing the pixel update process into two separate functional elements: a memory element for storing pixel information and a liquid crystal element for display. This segmentation allows the memory to be loaded with pixel data independently from the liquid crystal update process, enabling parallel operations that eliminate the bottleneck of sequential loading and display
Solution Approach 2:
The patent uses the memory element as an intermediary between the data source and the liquid crystal element. The memory element receives and holds pixel information, then transfers it to the liquid crystal element when needed. This intermediary buffer decouples the loading process from the display process, allowing gate selection time to be extended for more gate lines without being constrained by pixel load time
Data Source
AI summary
Within one gate selection time interval: first pixel information is driven from a source line to a liquid crystal LC element of a pixel; and second pixel information is driven from the source line to a memory element of the pixel; and the second pixel information is driven from the memory element of the pixel to the LC element of the pixel. Respecting a second pixel, similar occurs for third and fourth pixel information within a second gate selection time interval, such that the second pixel information is driven from the memory element of the first pixel to the LC element of the first pixel simultaneous with the third pixel information being driven from the source line to the LC element of the second pixel. Such simultaneous driving enables a faster refresh rate and/or larger displays. Various circuit-specific implementations are shown.