LCD Driving Circuit with Integrated Photosensor for Luminance Uniformity
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Solution Overview
Problem
Conventional liquid crystal display devices face increased manufacturing costs and image quality deterioration due to luminance deviations between division areas, caused by temperature, driving voltage, and emission time deviations between LEDs.
Innovation Solution
A driving circuit and method for a liquid crystal display device that includes a plurality of LED modules arranged in division areas, with an internal photosensor to detect luminance values and a controller generating control signals to equalize luminance across areas, using external photosensors for real-time detection and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photosensors are respectively mounted in each division area to detect luminance values, then luminance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
Multiple photosensors are merged into a single integrated photosensor unit. The integrated photosensor includes multiple photoelectric conversion elements arranged in specific patterns, allowing it to detect luminance information from multiple division areas simultaneously, thereby reducing component count and manufacturing cost while maintaining luminance uniformity control capability
Solution Approach 2:
The integrated photosensor serves multiple functions: it detects luminance values from multiple division areas, provides feedback signals for each area, and enables uniformity control across the entire display panel, replacing what would traditionally require multiple separate photosensors
2Area of stationary object
If LED modules are arranged in multiple division areas to increase display area, then display coverage is improved, but luminance deviation between areas worsens
Solution Approach 1:
The system implements a feedback control mechanism where the integrated photosensor continuously detects luminance values from multiple division areas, and the controller adjusts driving signals to LED modules based on detected deviations, thereby maintaining luminance uniformity across the expanded display area
Solution Approach 2:
The integrated photosensor employs a specific arrangement of photoelectric conversion elements that enables differentiated detection of luminance characteristics in different division areas, allowing localized measurement and control to maintain uniformity across the entire display surface
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
This solution reduces manufacturing costs and improves image quality by minimizing luminance deviations between emission areas, ensuring uniform luminance and reducing display unevenness.
Implementation Method 1
an LED backlight which includes a plurality of LED modules arranged in a plurality of division areas and generates light
Implementation Method 2
an internal photosensor which is mounted in any one of the plurality of division areas, for detecting a luminance value
Data Source
AI summary
A driving circuit of a liquid crystal display device and a method for driving the same, which are capable of reducing manufacturing cost of the liquid crystal display device and reducing a luminance deviation so as to improve image quality, are disclosed. The driving circuit of the liquid crystal display device includes an LED backlight which includes a plurality of LED modules arranged in a plurality of division areas and generates light, an internal photosensor which is mounted in any one of the plurality of division areas, for detecting a luminance value, a controller which generates and outputs a plurality of control signals for changing respective luminance values of the plurality of division areas according to the luminance value detected by the internal photosensor, and a plurality of LED drivers which drive the plurality of LED modules according to the plurality of control signals.