LCD Intensity Compensation via Polarization Adjustment
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Solution Overview
Problem
Conventional local dimming technologies fail to effectively compensate for intensity loss due to non-uniform backlight profiles in LCDs, particularly when combined with mura panel non-uniformity, leading to suboptimal image display quality.
Innovation Solution
An intensity compensation method that calculates compensation gains based on backlight duty cycles and non-uniform backlight profiles to adjust pixel image intensities, ensuring uniformity and preventing image darkening or non-uniformity by modulating backlight intensities using PWM or other methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming technology is applied to reduce power consumption by lowering backlight intensity in certain regions, then power consumption is reduced, but image intensity loss occurs and requires compensation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the polarizing degree of the liquid crystal layer based on the backlight intensity reduction. When backlight intensity is lowered in specific regions for power saving, the system compensates by increasing the polarizing degree in those same regions, thereby maintaining the image intensity at acceptable levels while still achieving power consumption reduction.
2Illumination intensity
If conventional mura compensation is applied when all backlight sources are fully turned on, then backlight non-uniformity is compensated, but the compensation becomes ineffective when local dimming lowers backlight intensity
Solution Approach 1:
The patent implements dynamics by making the mura compensation adaptive to the actual backlight intensity distribution. Instead of using a fixed compensation method that works only when all backlight sources are fully on, the system dynamically adjusts the compensation based on the actual intensity profile generated during local dimming operation. This allows the compensation to remain effective across different operating conditions.
Solution Approach 2:
The system employs feedback by measuring or detecting the actual backlight intensity distribution in real-time and using this information to adjust the compensation parameters. The feedback loop ensures that the compensation accurately reflects the current state of the backlight system, maintaining uniformity even when local dimming creates non-uniform intensity patterns.
3Use of energy by moving object
If local dimming lowers backlight intensity to save power, then power consumption decreases, but light leakage from backlight to other display regions increases causing non-uniformity
Solution Approach 1:
The patent addresses this contradiction by changing the operating parameters of the liquid crystal layer. Specifically, it adjusts the polarizing degree dynamically in response to backlight intensity changes. When backlight intensity is reduced in certain regions for power saving, the system increases the polarizing degree to compensate for the reduced light output and maintain uniform image intensity across the display.
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 method effectively compensates for intensity loss and non-uniformity, maintaining image quality by adjusting backlight intensities and enhancing liquid crystal polarization, thus preventing image darkening or non-uniformity caused by local dimming and mura panel issues.
Implementation Method 1
the liquid crystal layer for modulating a light intensity of a light passing through the liquid crystal layer according to a polarizing degree of the liquid crystal layer
Data Source
AI summary
An intensity compensation method for a display control device includes steps of obtaining a plurality of backlight duties of a plurality of backlights according to an image data; calculating a plurality of compensation gains according to the plurality of backlight duties and a non-uniform backlight profile, wherein the non-uniform backlight profile indicates a plurality of respective actual intensity distributions of the plurality of backlights; and compensating a plurality of first image intensities corresponding to a plurality of pixels of the image data according to the plurality of compensation gains, to obtain a plurality of second image intensities.