LCD Charge Sharing Control for Power and Delay
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Solution Overview
Problem
Conventional charge sharing methods in liquid crystal displays (LCDs) fail to uniformly reduce power consumption across all data integrated circuits (ICs), leading to increased power consumption in specific ICs due to uniform application of charge sharing regardless of data pattern characteristics.
Innovation Solution
An LCD system that analyzes input data patterns and generates selection signals to independently control charge sharing for each data IC, allowing for adaptive use of charge sharing based on data patterns, thereby optimizing power consumption and reducing charging delay variations between ICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If charge sharing is uniformly applied to all data ICs, then power consumption is reduced for data ICs with data patterns having large output level differences, but power consumption increases for data ICs with data patterns having small output level differences
Solution Approach 1:
The patent applies local quality by enabling each data IC to independently determine whether to apply charge sharing based on its own data pattern characteristics. The data ICs are divided into first and second groups, where the first group applies charge sharing and the second group does not, allowing each IC to be optimized for its specific data pattern conditions rather than applying a uniform approach across all ICs.
Solution Approach 2:
The patent implements dynamics by making the charge sharing function dynamically controllable for each data IC. The data ICs can switch between applying and not applying charge sharing based on real-time data pattern analysis, allowing the system to adapt its power consumption strategy dynamically rather than being static or uniformly applied.
2Use of energy by moving object
If charge sharing is applied to reduce power consumption, then the swing width of data voltage is reduced, but charging delay variation between data ICs increases causing block dim
Solution Approach 1:
The patent applies local quality by allowing different charging delay compensation strategies for different data ICs based on their specific operating conditions. Data ICs in the first group that apply charge sharing receive different compensation than data ICs in the second group that do not apply charge sharing, ensuring uniform display quality across the panel despite different power consumption modes.
Solution Approach 2:
The patent uses copying by creating a compensation signal that replicates the charging delay characteristics and applies it to adjust the output timing. The charging delay compensation signal is generated based on the data patterns and charge sharing status, copying the delay characteristics to compensate for and eliminate block dim effects.
Data Source
AI summary
A liquid crystal display including a liquid crystal display panel including a plurality of data lines, a plurality of gate lines intersecting the data lines, and liquid crystal cells respectively formed at intersections of the data lines and the gate lines, and divided into a first area, a second area and a third area, a first data integrated circuit (IC) that drives the first area, a second data IC that drives the second area, a third data IC that drives the third area, and a timing controller that analyzes an input digital video data, generates a first selection signal and a second selection signal for controlling whether charge sharing is used, and independently controls the first, second, and third data ICs using the first and second selection signals, wherein the second area is divided into a first block adjoining the first area, a third block adjoining the third area and a second block located between the first block and the third block; and the first selection signal controls whether the charge sharing is used for the first and third data ICs, and the second selection signal controls whether the charge sharing is used for the second block and controls a charging delay variation so that the charging delay variation is lessened between the second block and the first area or between the second block and the third area in the first or third block.