Dielectric Grating Layer for Display Panel Light Utilization
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Solution Overview
Problem
Reflective displays have a low utilization ratio of ambient light, resulting in degraded contrast and display brightness due to the inefficient use of weak and divergent ambient light.
Innovation Solution
A display panel design incorporating a base substrate, a reflecting layer, a dielectric grating layer, and a color filter layer, where the color filter layer includes elements for different colors, and the dielectric grating layer reflects light rays of specific wavelengths to corresponding color filter elements, enhancing light utilization and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional color filter layer is used to display colors, then the display can show different colors, but the utilization ratio of ambient light is low resulting in degraded contrast and display brightness
Solution Approach 1:
The color filter layer is segmented into multiple types of color filter elements (first, second, and third color filter elements) with different optical characteristics. Each type transmits specific wavelength ranges differently, enabling selective light transmission and reflection to improve ambient light utilization while maintaining color display capability
Solution Approach 2:
The patent changes the optical parameters of the color filter layer by introducing multiple color filter element types with different transmission characteristics. The first color filter elements transmit light in a first wavelength range, second color filter elements transmit light in a second wavelength range, and third color filter elements transmit light in a third wavelength range, optimizing the utilization of ambient light across different spectral regions
2Reliability
If ambient light is used directly without wavelength separation, then the display structure is simple, but the contrast is degraded due to inefficient light utilization
Solution Approach 1:
The color filter layer is divided into multiple functional segments (different color filter elements) that selectively transmit different wavelength ranges. This segmentation enables wavelength-separated light paths that improve contrast by directing specific wavelengths to appropriate display regions, while the overall structure remains integrated and manageable
Solution Approach 2:
The color filter layer serves multiple functions simultaneously: it acts as a wavelength separator, a light transmission controller, and a contrast enhancement mechanism. By incorporating multiple types of color filter elements, the single layer performs what would traditionally require multiple separate optical components
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
Improves the utilization ratio of ambient light, enhancing display brightness and contrast by effectively reflecting light rays of different wavelengths to their respective color filter elements, thereby improving the display effect.
Implementation Method 1
the dielectric grating layer includes a grating element corresponding in position to the third color filter element; and the grating element is configured to reflect the light rays in the first color transmitted through the filter layer to the first color filter element, and to reflect the light rays in the second color transmitted through the filter layer to the second color filter element
Implementation Method 2
the filter layer is configured to transmit the light rays in the first color and the second color, and to reflect light rays in a third color
Data Source
AI summary
The disclosure discloses a display panel and a display device. The display panel includes: a base substrate, a reflecting layer, a dielectric grating layer, a filter layer, and a color filter layer including a first color filter element for transmitting light rays in a first color, a second color filter element for transmitting light rays in a second color, and a third color filter element for transmitting white light; the filter layer is configured to transmit light rays in first and second colors, and to reflect light rays in a third color; the dielectric grating layer includes a grating element corresponding in position to the third color filter element, and configured to reflect light rays in the first color transmitted through the filter layer to the first color filter element, and to reflect light rays in the second color transmitted through the filter layer to the second color filter element.