Liquid Crystal Display Pixel Memory Power Reduction
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Solution Overview
Problem
Active matrix liquid crystal displays consume high power due to the operation of driving circuits for thin film transistors, which is a challenge in developing smaller, lighter, and lower power-consuming portable electronic devices.
Innovation Solution
The implementation of a liquid crystal display with a data driver, gate driver, and a liquid crystal display panel featuring pixel memories with specific NAND and NOR gates, memory switching elements, and switching elements that alternate voltages between high and low levels to reduce power consumption by storing pixel voltages and operating the liquid crystal cells without continuous data and common voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an active matrix drive method is used with thin film transistors to improve display quality, then display quality is improved, but power consumption is increased
Solution Approach 1:
The patent applies preliminary action by pre-charging pixel electrodes through pixel memories before the actual display period. The pixel memories store voltage charges that are prepared in advance during a charging period, allowing the liquid crystal cells to be driven without continuous voltage application from data lines, thereby reducing power consumption while maintaining display quality.
Solution Approach 2:
The patent extracts the voltage storage function from the main data driving circuit and places it in separate pixel memories at each pixel location. This separation allows the main data driver to stop supplying voltage during the display period, as the pixel memories independently maintain the required voltages, thus reducing overall power consumption while preserving display quality.
2Reliability
If continuous voltage application is used to maintain driving states, then display performance is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by dividing the operation into distinct charging and display periods. During the charging period, pixel memories are charged to required voltages. During the subsequent display period, the pixel memories maintain these voltages without continuous external supply. This periodic operation pattern ensures reliable display performance while significantly reducing power consumption compared to continuous voltage application.
Solution Approach 2:
The patent applies self-service by enabling pixel memories to autonomously maintain their charged states during the display period without requiring continuous external voltage supply. The stored charges in pixel memories self-sustain the driving voltages for liquid crystal cells, allowing the display to maintain performance while the power supply can be reduced or interrupted, thus lowering power consumption.
Data Source
AI summary
A liquid crystal display having reduced power consumption. The liquid crystal display includes a liquid crystal display panel having a plurality of pixels and a plurality of pixel memories. A pixel voltage is stored in a pixel memory in an on screen display (OSD) region of the liquid crystal display panel for displaying a still image for a long period of time and driving a liquid crystal cell by the stored pixel voltage. Also, the power consumption of the liquid crystal display can be reduced by using a NAND gate or a NOR gate as a circuit element for alternating a voltage between low level and high level so as to store a pixel voltage in a pixel memory of the liquid crystal display.