LED Backlight Array Series Parallel Control
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Solution Overview
Problem
Existing back-light apparatuses for liquid crystal display devices, particularly those using cold cathode fluorescence lamps, face environmental regulation issues and are limited in their suitability for time-division methods, requiring improved light efficiency and adaptability for various LCD models.
Innovation Solution
A back-light apparatus utilizing an array of light emitting diodes (LEDs) with a power unit and control unit to selectively connect LEDs in series or parallel, along with an optical lens for efficient light distribution, replacing traditional lamps and accommodating different LCD models and driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cold cathode fluorescence lamps are used in back-light apparatuses, then light can be supplied to display panels, but environmental regulation issues arise and suitability for time-division methods is limited
Solution Approach 1:
The patent changes the fundamental parameter of the light source from cold cathode fluorescence lamps to light emitting diodes (LEDs). This parameter change resolves both the environmental regulation issues associated with mercury-containing CCFLs and the limitations in compatibility with time-division methods, as LEDs can be selectively controlled for different color sub-frames
Solution Approach 2:
The patent adopts LED technology which, while having a longer operational life than CCFLs, represents a more environmentally friendly and adaptable light source that can be easily replaced and configured for different LCD models and driving conditions
2Use of energy by moving object
If multiple light emitting diodes are used to improve light efficiency, then light supply efficiency increases, but device complexity increases due to need for power unit and control unit
Solution Approach 1:
The patent segments the light emitting elements into multiple independent LEDs arranged in an array, each capable of being individually controlled. This segmentation enables selective activation of LEDs for different color sub-frames in time-division methods while maintaining the ability to manage complexity through modular control
Solution Approach 2:
The patent introduces dynamic control capabilities through the control unit that can selectively connect LEDs in series or parallel configurations based on driving conditions and LCD model requirements, allowing the system to adapt its electrical characteristics dynamically
3Adaptability or versatility
If LEDs are arranged in an array to accommodate various LCD models, then adaptability improves, but manufacturing complexity increases
Solution Approach 1:
The patent designs a universal LED array configuration that can serve multiple LCD models and driving conditions through a single standardized structure. The array of LEDs with integrated power and control units can be adapted to different display panel sizes and configurations, eliminating the need for model-specific custom manufacturing
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 LED-based back-light apparatus provides efficient light supply, meets environmental standards, and enhances productivity by being adaptable to various LCD models and time-division methods, improving light efficiency and color reproduction.
Implementation Method 1
a light emitting unit including a plurality of light emitting diodes arranged on a substrate
Implementation Method 2
an optical lens for efficient light distribution
Data Source
AI summary
A back-light apparatus for a display includes: a plurality of light emitting diodes attached on a substrate; a first common line mounted on the substrate to commonly connect first electrodes of the light emitting diodes; a second common line mounted on the substrate to commonly connect second electrodes of the light emitting diodes; a plurality of third lines connected to preceding second electrodes of the light emitting diodes and succeeding first electrodes of the light emitting diodes; first and second selection switches disconnecting the first common line and the second common line so that the light emitting diodes are connected in parallel; third selection switches for disconnecting the third lines so that the light emitting diodes are connected in series; a power unit to supply power to the light emitting diodes; and a control unit to control the first, second and third selection switches for the light emitting diodes.