Backlight Unit Glass Light Guide Plate Color Consistency
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Solution Overview
Problem
LCD devices experience degraded image quality due to color coordinate and color sense differences between the light guide plate's sides, caused by the material properties of the light guide plate, leading to inconsistent light distribution.
Innovation Solution
Incorporating a blue light source, a glass light guide plate, an optical sheet, and an optic change part with a yellow fluorescent material that converts blue light into white light, ensuring consistent light distribution and reducing color differences across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a glass light guide plate is used to provide light from the light source to the liquid crystal panel, then light transmission is improved, but color coordinate and color sense differences are generated between the first side (facing the light source) and the second side (opposite to the first side)
Solution Approach 1:
The patent applies local quality by introducing an optical change part at a specific location (the second side of the light guide plate) to address the color inconsistency issue. This optical change part is positioned only where needed to convert blue light to white light, thereby correcting the color coordinate difference without affecting the overall light transmission performance of the glass light guide plate.
Solution Approach 2:
The patent utilizes parameter changes by employing an optical change part that converts blue light to white light, thereby altering the color temperature and chromaticity parameters of the light output. This parameter transformation corrects the color coordinate differences between the two sides of the light guide plate, achieving consistent color reproduction while maintaining high light transmission.
2Productivity
If the light guide plate material properties are used to distribute light, then light distribution is achieved, but color sense differences between sides are generated leading to degraded image quality
Solution Approach 1:
The optical change part is strategically positioned at the second side of the light guide plate where color correction is most needed. This localized approach allows the system to maintain efficient light distribution through the glass light guide plate while correcting color inconsistencies only where they occur, thereby preserving image quality consistency without sacrificing light distribution efficiency.
Solution Approach 2:
The optical change part acts as an intermediary element between the glass light guide plate and the liquid crystal panel. It mediates the light output by converting blue light to white light, thereby reconciling the conflict between efficient light distribution and color consistency, and ensuring reliable image quality.
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 color coordinate and color sense differences between the light-incident and opposite sides of the light guide plate, enhancing color purity and consistency in the backlight unit, thereby improving the overall image quality of the LCD device.
Implementation Method 1
an optic change part including a yellow fluorescent material, wherein the blue light is changed into a white light by the optical change part
Data Source
AI summary
A backlight unit includes a light source providing a blue light; a light guide plate of glass at a side of the light source; an optical sheet on the light guide plate; a reflective sheet under the light guide plate; and an optic change part including a yellow fluorescent material, wherein the blue light is changed into a white light by the optical change part.