LED Backlight Assembly Edge Brightness Compensation
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Solution Overview
Problem
Backlight assemblies using light emitting diodes (LEDs) for flat panel displays often suffer from non-uniform color emission due to uneven mixing of red, green, and blue light, leading to reduced color uniformity across the liquid crystal panel.
Innovation Solution
A backlight assembly design that includes a light emitting diode array with a light guide plate and an optical sheet, where the light emitting diodes at both ends produce less intense light to prevent color running, and the use of a supporter with a shielding unit or haze-processing to ensure uniform white light distribution across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If red, green, and blue light emitting diodes are arranged in order to produce white light, then the representable color range is wide, but color uniformity is reduced due to excessive red and blue light at the ends
Solution Approach 1:
The patent applies local quality by making the light emitting diodes at both ends of the array have lower luminance compared to the central light emitting diodes. This creates a non-uniform distribution where edge LEDs emit less light, specifically compensating for the excessive red and blue light at the ends. The luminance of end LEDs is reduced to prevent color running and achieve uniform white light across the liquid crystal panel.
2Device complexity
If light emitting diodes are positioned at both ends of the array, then the structure is simplified, but color running occurs due to concentrated red and blue light emission
Solution Approach 1:
The patent applies parameter changes by modifying the luminance parameter of light emitting diodes positioned at both ends of the array. The end LEDs are designed to emit light at a lower luminance level compared to central LEDs. This parameter adjustment compensates for the concentration of red and blue light at the ends, preventing color running while maintaining the simplified array structure with LEDs at both ends.
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 ensures uniform white light emission across the liquid crystal panel, preventing color non-uniformity and enhancing the display's visual performance by reducing the intensity of red and blue light at the edges, thus maintaining consistent color representation.
Implementation Method 1
a light guide plate at the side of the light emitting diode array
Implementation Method 2
an optical sheet diffusing light emitted from the light guide plate
Data Source
AI summary
A LED backlight assembly including a light emitting diode array having a plurality of red, green and blue light emitting diodes; a light guide plate at the side of the light emitting diode array; and a supporter supporting the light guide plate. The amount of red light produced by a red light emitting diode positioned at one end of the light emitting diode array and the amount of blue light produced by a blue light emitting diode positioned at another end of the light emitting diode array is less than that produced by the next light emitting diode of the same color, respectively.