Color Separation Diffractive Substrate for Display Light Efficiency
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Solution Overview
Problem
Existing color filter type display devices have low light usage efficiency due to absorption of unwanted wavelengths, and achieving precise alignment of separated light beams with subpixels is challenging, especially in head-up displays where optimal light distribution is required.
Innovation Solution
A display device structure incorporating a color separation diffractive element substrate with minute and periodic grooves, paired with a light source unit featuring an LED light source and lenses to adjust light coherence and direction, ensuring efficient separation and concentration of RGB light beams onto corresponding subpixels, and a diffusion layer for optimal field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a color separation diffractive element substrate is used to separate white backlight into RGB wavelengths, then light usage efficiency is improved, but precise alignment of separated light beams with subpixels becomes difficult due to distance and positional shifts
Solution Approach 1:
A light guiding plate is introduced as an intermediary component between the color separation diffractive element substrate and the liquid crystal panel. This plate guides the separated RGB light beams from the diffractive elements to the corresponding subpixels, compensating for positional shifts and maintaining precise alignment without requiring direct contact or extremely tight tolerances between the diffractive elements and subpixels.
Solution Approach 2:
The patent utilizes the thickness dimension of the light guiding plate to resolve alignment issues. By adjusting the position of the color separation diffractive element substrate along the optical axis (thickness direction) relative to the liquid crystal panel, precise alignment can be achieved without compromising manufacturing tolerances in the plane direction.
2Use of energy by moving object
If the distance between light source and color separation diffractive element substrate is increased, then light separation effectiveness is improved, but alignment precision deteriorates due to greater positional shifts
Solution Approach 1:
The light guiding plate serves as a mediator that decouples the distance requirement for effective light separation from the alignment precision requirement. The plate can be positioned at an optimal distance from the diffractive element substrate to ensure effective separation, while its structure and positioning mechanisms maintain precise alignment with subpixels regardless of this distance.
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 enhances light usage efficiency by minimizing unwanted absorption, achieving coherent light distribution, and providing even brightness across the display area, particularly effective in head-up displays by directing light distribution appropriately.
Implementation Method 1
a color separation diffractive element substrate with minute and periodic grooves... incident light is separated into different color wavelengths... and diffracted toward the corresponding color subpixels
Implementation Method 2
a light source unit... with lenses to adjust light coherence and direction
Data Source
AI summary
According to one embodiment, in the display device, on the substrate opposed the liquid crystal panel, an element is formed by grooves having steps in a minute and periodic pattern, and the element separates the backlight from the light source unit into light of different color wavelengths and diffract them toward the corresponding color subpixels of the liquid crystal panel. In the light source unit, the first lens shapes the incident light from the light source according to the shape of the display surface of the panel, and the second lens irradiates the light incident surface of the substrate with the light shaped by the first lens as the backlight.