Backlight Device Voltage Equalization and LED Arrangement
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Solution Overview
Problem
In liquid crystal display devices, backlight systems using LEDs experience power loss and color unevenness due to differing drive voltages among red, green, and blue light emitting diodes, leading to inefficient energy use and image quality issues.
Innovation Solution
A backlight device configuration with clusters of light emitting diodes, where each cluster includes a magenta, green, and blue light emitting body, with wavelength conversion materials to equalize drive voltages and arrange LEDs to prevent adjacent same-color LEDs, ensuring uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If red, green, and blue LEDs are used with different drive voltages, then color variety is achieved, but power loss occurs due to voltage mismatch
Solution Approach 1:
The patent changes the electrical parameter (drive voltage) by introducing a voltage conversion circuit that converts the drive voltage of red LEDs to match the higher drive voltage of green and blue LEDs. This parameter transformation eliminates the voltage mismatch problem, preventing power loss while maintaining the ability to drive all three color LEDs effectively.
Solution Approach 2:
The patent introduces a voltage conversion circuit as an intermediary component between the power source and the LEDs with different drive voltages. This mediator circuit transforms the voltage levels to ensure all LEDs operate at the same drive voltage, thereby eliminating power loss caused by voltage differences without requiring separate power sources for each LED type.
2Ease of manufacture
If same-color LEDs are arranged adjacently, then manufacturing is simplified, but color unevenness occurs in the emitted light
Solution Approach 1:
The patent applies local quality by creating spatial variation in the arrangement pattern of LEDs. Specifically, it alternates between different arrangement patterns in different regions (first arrangement pattern and second arrangement pattern), ensuring that same-color LEDs are not adjacently positioned. This local variation in arrangement quality prevents color unevenness while maintaining manufacturing feasibility.
Solution Approach 2:
The patent introduces asymmetry in the LED arrangement by using two different arrangement patterns instead of a uniform pattern. The first and second arrangement patterns are designed to be asymmetric relative to each other, which prevents the formation of adjacent same-color LEDs and ensures uniform color distribution across the 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 configuration reduces power loss and color unevenness by equalizing drive voltages across LEDs and arranging them to prevent adjacent same-color LEDs, resulting in improved energy efficiency and image quality.
Implementation Method 1
a red wavelength conversion material excited by light emitted from either the blue light emitting element or the green light emitting element to emit red light
Implementation Method 2
a blue light emitting element
Implementation Method 3
Light Emitting Diodes (LEDs) have been increasingly adopted
Implementation Method 4
a green light emitting element
Implementation Method 5
a green LED emitting green light
Data Source
AI summary
Object:To provide a backlight device for a liquid crystal display device which can suppress occurrence of power loss in any of light emitting bodies, and a liquid crystal display device including the backlight device.Solution to Problem:In a cluster (161), arranged are two magenta light emitting bodies (131) including a blue light emitting element (143) with high drive voltage and red phosphors (151) covering the blue light emitting element (143), two green light emitting bodies (132), and one blue light emitting body (133). With this configuration, since two blue LED elements (143) are implemented also in two magenta light emitting bodies (131), the drive voltage of the magenta light emitting bodies (131) is substantially equal to the drive voltage of the green light emitting bodies (132) and the blue light emitting body (133).