Multi-bit Memory Pixel Time-Division Driving
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Solution Overview
Problem
Conventional multi-bit memory systems for liquid crystal displays face inefficiencies in image displaying due to unnecessary electrode areas, fixed pattern issues, and limitations in resolution and grayscale number, leading to suboptimal image quality and efficiency.
Innovation Solution
The implementation of a multi-bit memory system where input image data is recorded in a memory part of each pixel, allowing for time-division driving to represent grayscale, reducing unnecessary electrode areas, and simplifying the configuration by reducing the number of semiconductor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the area-ratio grayscale system with multiple sub-pixels is used to represent grayscale, then the grayscale can be controlled by changing the area of displaying regions, but unnecessary electrode areas are created and the number of semiconductor elements increases
Solution Approach 1:
The pixel is divided into multiple sub-pixels (first sub-pixel and second sub-pixel) with different electrode areas. Each sub-pixel is controlled independently through time-division driving, allowing grayscale representation without requiring excessive semiconductor elements. The segmentation enables efficient use of electrode area while maintaining control precision.
Solution Approach 2:
The patent employs time-division driving where the first and second sub-pixels are driven alternately in different time periods within one frame. The first sub-pixel is driven during a first time period and the second sub-pixel during a second time period. This periodic action allows grayscale representation through temporal multiplexing rather than spatial multiplication, reducing the number of semiconductor elements required.
2Reliability
If multiple sub-pixels with different areas are used for grayscale representation, then grayscale control is achieved, but fixed patterns occur due to varying centroid positions
Solution Approach 1:
Different sub-pixels are assigned different electrode areas (first sub-pixel has larger area, second sub-pixel has smaller area) to create local quality variations. This allows each sub-pixel to contribute differently to the overall luminance while maintaining a fixed centroid position when driven alternately in time-division mode, thereby preventing fixed pattern artifacts.
3Device complexity
If conventional multi-bit memory systems are used, then image data can be stored, but the configuration becomes complex with unnecessary semiconductor elements
Solution Approach 1:
The pixel circuit is designed to perform multiple functions: it serves as both a memory element for storing image data and as a driving circuit for time-division control of sub-pixels. The circuit configuration integrates the multi-bit memory functionality with the grayscale control mechanism, eliminating the need for separate semiconductor elements and simplifying the overall device complexity.
Data Source
AI summary
The present invention is applied to e.g. a liquid crystal display apparatus based on a multi-bit memory system. In the invention, input image data (SIG) is recorded in a memory part 62 in each pixel, and the grayscale is represented by time-division driving in accordance with the input image data (SIG) recorded in this memory part 62.