LCD Data Stretching for Power and Image Quality
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Solution Overview
Problem
Large-sized and high-definition liquid crystal displays consume high power, leading to unattractive appearances when not in use and increased energy costs, especially when mounted on walls in home or office environments.
Innovation Solution
A liquid crystal display system that includes a data stretching unit to modulate video signals using a data stretching curve determined by brightness, reducing backlight luminance through a dimming signal and internal timing signals, along with a self-screen drive controller to minimize power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight luminance is reduced to lower power consumption, then power consumption decreases, but gray scale banding phenomena occur and image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data stretching curve based on the average luminance level. When backlight luminance is reduced, the system modifies the gamma correction parameters to compensate for the reduced brightness range, thereby preventing gray scale banding while maintaining low power consumption operation
Solution Approach 2:
The system dynamically adapts the data stretching characteristics according to the actual luminance conditions. By making the gamma correction adjustable rather than fixed, the system can optimize image quality for each backlight luminance level, resolving the contradiction between power saving and image quality
2Measurement precision
If large-sized liquid crystal displays are used for high definition display, then display quality improves, but power consumption increases
Solution Approach 1:
The patent applies partial action by using data stretching and gamma correction only when necessary (in low luminance conditions or when image quality requires it). The system can operate with standard display characteristics under normal conditions, reducing processing overhead and power consumption while maintaining high definition display quality when needed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves low power consumption, preventing banding phenomena in gray scales and increasing average luminance, resulting in an attractive appearance even when not in use, suitable for interior design applications.
Implementation Method 1
controlling a light transmittance of a liquid crystal layer through an electric field
Implementation Method 2
liquid crystal cell Clc, liquid crystal layer, arrangement state of liquid crystal molecules
Data Source
AI summary
A liquid crystal display is disclosed. The liquid crystal display includes a liquid crystal display panel; a backlight unit; a panel drive circuit; a timing controller; a data stretching unit that modulates an internal video signal using a data stretching curve determined depending on a brightness of the internal video signal for a self-screen drive; an internal memory; a self-screen drive controller; a scaler unit; a selection unit; an internal power circuit; an external power circuit; and a microprocessor that blocks an output of the external power circuit from being supplied to the scaler unit in the self-screen drive.