Back Light System with Segmented Organic Electroluminescence
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Solution Overview
Problem
The power consumption of back light systems in liquid crystal display devices is high, affecting the driving period of mobile devices and leading to reduced display quality due to low contrast when luminance is reduced.
Innovation Solution
A back light system with light-emitting dividing parts that modulate luminescent brightness according to the display image, using an organic electroluminescent light emitting device with anode and cathode electrodes formed in a stripe pattern to correspond with pixel rows, and a synchronous circuit to control light emission for maximum luminance, reducing power consumption and maintaining high contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the luminance of the back light system is reduced, then power consumption is reduced, but contrast becomes small and display quality deteriorates
Solution Approach 1:
The back light system is divided into multiple independent light-emitting dividing parts corresponding to different pixel rows. Each dividing part can emit light independently with controlled luminance, allowing selective illumination of only those rows containing maximum luminance pixels, thus reducing overall power consumption while maintaining contrast where needed
Solution Approach 2:
Different luminance levels are applied to different regions (pixel rows) based on local requirements. The lighting control part adjusts the luminance of each light-emitting dividing part individually according to the display image content, providing high luminance only where necessary to maintain contrast while reducing power consumption in other regions
2Use of energy by stationary object
If the luminance of the back light system is reduced, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The back light system is segmented into multiple independently controllable light-emitting dividing parts. This allows the system to maintain high display quality by ensuring adequate luminance is provided only in regions where the display image requires it, while reducing luminance in other regions to lower power consumption
Solution Approach 2:
The lighting control part receives display image data and uses this information to control the luminance of each light-emitting dividing part. This feedback mechanism ensures that display quality is maintained by adjusting luminance according to the actual content being displayed, while optimizing power consumption
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 solution significantly reduces power consumption while maintaining high contrast and display quality by controlling light emission per pixel row, optimizing power usage and image brightness.
Implementation Method 1
using an organic electroluminescent light emitting device with anode and cathode electrodes formed in a stripe pattern
Data Source
AI summary
A back light system and a liquid crystal display device, which can reduce the power consumption substantially, are provided. The power consumption can be substantially reduced by providing a plurality of light-emitting dividing parts to which area division of the light emitting surface which illuminates with light towards a liquid crystal panel is performed, and controlling the luminescent brightness in the light-emitting dividing parts according to the corresponding display image of a display area in the liquid crystal panel.