Light-Absorbing Display Layer for Edge Color Uniformity
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Solution Overview
Problem
Existing display devices face challenges in improving image quality, color reproducibility, and minimizing color differences at the edges of the display panel, while also seeking to reduce the amount of required phosphors to lower costs.
Innovation Solution
Incorporating a display device with a light guide plate, a reflective sheet, a light-absorbing layer, and an optical assembly that includes phosphors, such as red and green phosphors, to enhance light conversion and minimize color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phosphors are used for light conversion in display devices, then color reproducibility and image quality are improved, but the amount of phosphors required increases leading to higher costs
Solution Approach 1:
The patent applies local quality by using a light-absorbing layer with specific optical properties positioned at strategic locations within the light guide plate structure. This layer selectively absorbs certain wavelengths of light and converts them to desired colors, improving color reproducibility in specific regions without requiring phosphors throughout the entire display device, thus reducing overall phosphor quantity while maintaining quality enhancement.
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical characteristics of the light guide plate through the introduction of a light-absorbing layer with specific absorption spectra. By changing the optical parameters (absorption coefficients, transmission characteristics) of the light guide plate, the system achieves improved color reproduction without relying on traditional phosphor materials, thereby reducing phosphor requirements and costs.
2Device complexity
If conventional light guide structures are used, then device complexity is low, but color difference occurs at the edges of the display panel
Solution Approach 1:
The patent applies segmentation by dividing the light guide plate into functional regions: a light-absorbing layer positioned in a first region and a light-emitting layer positioned in a second region. This segmentation allows different optical functions to be performed in different zones, with the light-absorbing layer correcting color differences at edges while the light-emitting layer provides uniform illumination in the center, thereby achieving color uniformity without significantly increasing overall device complexity.
Solution Approach 2:
The patent uses an intermediary approach by introducing a light-absorbing layer as a mediating element between the light source and the display panel. This intermediary layer selectively absorbs unwanted wavelengths and converts them to desired colors, acting as a corrective medium that eliminates color differences at edges without requiring fundamental changes to the overall device structure, thus maintaining simplicity while improving color uniformity.
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 improves image quality and color reproducibility by optimizing light distribution and reducing phosphor usage, thereby enhancing color purity and reducing costs.
Implementation Method 1
a light-absorbing layer positioned between the light guide plate and the display panel and absorbing light within a certain wavelength range
Implementation Method 2
including a phosphor, wherein the optical assembly may include: a light source providing blue-based light; an encapsulant covering a perimeter of the light source; and a phosphor disposed in the encapsulant
Data Source
AI summary
Disclosed is a display device. The display device of the present disclosure may include: a display panel; a light guide plate positioned behind the display panel; a reflective sheet positioned behind the light guide plate; a light-absorbing layer positioned between the light guide plate and the display panel and absorbing light within a certain wavelength range; an optical assembly providing light to one side of the light guide plate; and a side reflector positioned at the other side of the light guide plate, including a reflecting material, and having a specific color.