Stacked LCD Head-Up Display Layout for Color and Luminance Stability
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Solution Overview
Problem
Conventional head-up displays experience degradation in display quality due to chromaticity changes and luminance decreases when overlapping display panels are not aligned properly, leading to issues with light passing through non-display regions.
Innovation Solution
A configuration where a first liquid crystal display panel overlaps a second liquid crystal display panel with specific alignment of polarizing plates and liquid crystal layers to maximize transmittance, and by ensuring non-display regions of both panels do not overlap in the optical axis direction, reducing chromaticity changes and luminance decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display panels are stacked vertically to create multiple virtual images at different distances, then the viewer can perceive depth and spatial information, but light passing through non-display regions of upper panels degrades the display quality of lower panels
Solution Approach 1:
The patent divides each display panel into display regions and non-display regions. By segmenting the panel areas, the invention allows light to pass through non-display regions without being filtered by color filters, while maintaining proper color display in display regions. This resolves the contradiction by separating the optical path for depth perception from the optical path for color display.
Solution Approach 2:
The patent applies different structural configurations to different regions of the display panel. Display regions contain color filters for proper color rendering, while non-display regions omit color filters to allow clean light transmission. This local differentiation resolves the contradiction between needing color accuracy and allowing light transmission for depth perception.
2Adaptability or versatility
If non-display regions of stacked panels are left without color filters to allow light transmission, then depth perception is improved, but chromaticity changes and luminance decrease occur in overlapping display regions
Solution Approach 1:
The patent segments the display panel into distinct display and non-display regions. This segmentation allows the system to optimize each region for its specific function: non-display regions allow full light transmission for depth perception, while display regions maintain color accuracy for image display. The segmentation prevents the harmful mixing of optical paths.
Solution Approach 2:
The patent converts the potentially harmful effect of light passing through multiple panels into a beneficial feature. By intentionally designing non-display regions without color filters, the invention allows light to pass through these regions to create the desired depth effect, while the display regions compensate for any luminance loss through proper optical design and alignment.
3Adaptability or versatility
If multiple display panels are stacked to provide different output images at different distances, then the head-up display can present layered information, but alignment control becomes complex and manufacturing difficulty increases
Solution Approach 1:
The patent simplifies alignment control by segmenting each panel into display and non-display regions with clear functional boundaries. This segmentation allows for independent optimization of each region's optical properties and simplifies the alignment process, as non-display regions only need to be positioned to allow light transmission without requiring precise color alignment with panels below.
Solution Approach 2:
The patent makes the display panels multi-functional by having each panel simultaneously serve as both a display surface for images and an optical element for depth perception. This universality reduces the need for separate alignment mechanisms for different functions, as the same panel structure serves both purposes through the display/non-display region differentiation.
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 effectively minimizes display quality degradation by preventing overlapping regions from affecting the virtual images, thereby enhancing the visual experience.
Implementation Method 1
A polarizing plate provided in the first liquid crystal display panel and a polarizing plate provided in the second liquid crystal display panel are disposed such that transmission axes of the polarizing plates are orthogonal to each other with respect to incident light
Implementation Method 2
A liquid crystal layer provided in the first liquid crystal display panel and a liquid crystal layer provided in the second liquid crystal display panel are initially aligned such that transmittances of the first and second liquid crystal display panels are maximized
Implementation Method 3
The display region of the first liquid crystal display panel is provided with at least a liquid crystal layer, a polarizing plate, and a color filter
Implementation Method 4
a head-up display that projects an image onto a light-transmissive member such as glass or the like and allows the image reflected by the light-transmissive member to be visually recognized as a virtual image
Implementation Method 5
a light-transmissive member that transmits and reflects incident light and superimposed on a real image transmitted through the light-transmissive member
Data Source
AI summary
According to an aspect, a display device includes: a backlight, a first liquid crystal display panel, and a second liquid crystal display panel. The first liquid crystal display panel includes a display region. The second liquid crystal display panel includes a display region and a non-display region. The display region of the first liquid crystal display panel overlaps the non-display region of the second liquid crystal display panel when viewed in at least one direction in which the first and second liquid crystal display panels are placed so as to overlap each other. The display region of the first liquid crystal display panel is provided with at least a liquid crystal layer, a polarizing plate, and a color filter. The non-display region of the second liquid crystal display panel is provided with at least a liquid crystal layer and a polarizing plate and is not provided with a color filter.