LCD Pixel Memory Circuit Layout for Low-Flicker Refresh
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Solution Overview
Problem
Existing liquid crystal display devices with memory capabilities have high refresh frequencies and high power consumption due to the parallel configuration of storage and liquid crystal capacitances, leading to noticeable flicker and increased power usage.
Innovation Solution
The liquid crystal display device incorporates separate memory circuits and transistors for each pixel, allowing for reduced refresh frequency and power consumption by alternating the connection of power source lines and transistors to maintain display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a memory circuit is added to reduce refresh frequency, then productivity is improved, but device complexity increases
Solution Approach 1:
The pixel is divided into multiple independent memory circuits (first memory circuit and second memory circuit) that can be independently controlled by separate transistors. This segmentation allows selective refreshing of different memory circuits at different times, reducing the overall refresh frequency while maintaining display quality.
Solution Approach 2:
The patent implements periodic switching between first and second memory circuits, where each memory circuit is refreshed alternately at different time periods. This periodic action allows the system to maintain memory display functionality with a lower effective refresh frequency by leveraging the human eye's persistence of vision.
2Use of energy by moving object
If refresh frequency is reduced to lower power consumption, then use of energy is improved, but display quality may deteriorate
Solution Approach 1:
The patent employs periodic refreshing of memory circuits at reduced frequency, alternating between first and second memory circuits. This periodic action maintains acceptable display quality by exploiting temporal integration of human vision while significantly reducing power consumption compared to continuous high-frequency refreshing.
Solution Approach 2:
The system dynamically switches between different memory circuits and their corresponding transistors based on timing signals, allowing adaptive control of refresh operations. This dynamic switching enables the display to maintain quality during critical periods while consuming less power during stable display periods.
3Productivity
If separate memory circuits and transistors are added per pixel, then productivity is improved through reduced refresh frequency, but device complexity increases
Solution Approach 1:
Each pixel is segmented into multiple memory circuits with dedicated transistors, allowing independent control and refreshing. This segmentation enables the system to reduce overall refresh frequency by selectively updating only certain memory circuits at specific times, rather than refreshing all pixels simultaneously at high frequency.
Solution Approach 2:
The multiple memory circuits and transistors within each pixel provide multi-functionality, where different memory circuits can serve different purposes (e.g., storing different grayscale values, handling different color channels). This universal structure allows the same pixel design to support various display modes and refresh strategies.
Data Source
AI summary
A liquid crystal display device includes a pixel including a pixel electrode, a first power source line, and a second power source line, wherein the pixel includes a first memory circuit, a second memory circuit, a first transistor connected to the first memory circuit, and a second transistor connected to the second memory circuit, and the pixel electrode is connected to the first power source line via the first transistor and is connected to the second power source line via the second transistor.