LCD Brightness Stabilization via Adaptive Gain Control
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Solution Overview
Problem
Conventional LCD TVs cause eye strain and poor image contrast due to sudden changes in brightness, as the pupil must constantly adjust to varying light levels, unlike CRT TVs which maintain a more consistent lumen output.
Innovation Solution
An apparatus and method that adjust the gray scale levels of each pixel in a video sequence to stabilize image brightness, using a calculating module to determine a current and averaged brightness ratio, and an adjusting module to apply corresponding gains to maintain a consistent brightness level, suitable for various color spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LCD TV displays images with high brightness and high gray levels, then the brightness of the display is improved, but the pupil must constantly adjust causing eye strain and fatigue
Solution Approach 1:
The patent applies dynamics by making the brightness adjustment adaptive and responsive to image content changes. The system dynamically calculates brightness ratios and adjusts gray scale levels in real-time based on the displayed image characteristics, allowing the display to adapt its brightness output to match viewing conditions and reduce pupil adjustment frequency
Solution Approach 2:
The patent changes the parameter of gray scale levels dynamically based on calculated brightness ratios. By adjusting the gray scale levels of R, G, and B components according to the brightness ratio and predefined gains, the system modifies the actual luminous output to maintain more stable brightness perception and reduce eye strain
2Adaptability or versatility
If LCD TV displays images with sudden brightness changes, then the display can show diverse image content, but the contrast of the image deteriorates due to pupil adjustment time
Solution Approach 1:
The patent applies preliminary action by calculating the brightness ratio before displaying the image and pre-adjusting the gray scale levels accordingly. The system computes the brightness ratio based on the image content and applies the appropriate gain to the R, G, and B components in advance, ensuring smooth brightness transitions and maintaining image contrast when brightness changes occur
Solution Approach 2:
The patent implements feedback by continuously monitoring the displayed image content and adjusting the brightness accordingly. The system calculates the brightness ratio from the image data and uses this feedback to dynamically adjust the gray scale levels, creating a closed-loop control system that maintains optimal image quality and contrast
Data Source
AI summary
The invention discloses an apparatus for adjusting the brightness of the ith image of an inputted image sequence in a display system. The image sequence includes a plurality of images which each consists of a plurality of pixels. The apparatus includes a first calculating module for calculating a current brightness ratio, a second calculating module for calculating an averaged brightness ratio, a judging module for outputting one selected from the current brightness ratio or the averaged brightness ratio as an outputted brightness ratio, a determining module for storing a plurality of brightness ratios and the corresponding gains and for determining the gain corresponding to the outputted brightness ratio, and an adjusting module for multiplying the gray scale level of each pixel of the ith image by the gain corresponding to the outputted brightness ratio respectively, so as to adjust the brightness of the ith image.