Display Light Guide Reflector Angles for Uniform Symbol Luminance
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Solution Overview
Problem
Existing display devices exhibit uneven luminance across pattern displays due to varying areas of reflective prisms, causing user discomfort.
Innovation Solution
A display device with a transparent light guide featuring reflective parts having inclined reflective surfaces, where the inclination angles relative to the bottom surface vary based on proximity to the light source, ensuring uniform luminance without adjusting the reflective part areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of reflective inclined surfaces is increased to balance luminance, then luminance uniformity is improved, but the display surface area is reduced
Solution Approach 1:
The patent applies local quality by varying the inclination angles of reflective surfaces at different positions along the light propagation direction. Reflective surfaces closer to the light source have smaller inclination angles, while those farther away have larger inclination angles. This localized variation in surface orientation compensates for luminance differences without requiring uniform area changes across the entire display surface.
Solution Approach 2:
The patent changes the geometric parameter of inclination angle across different regions of the light guide. By systematically varying this parameter from smaller angles near the light source to larger angles farther away, the luminance distribution is balanced while preserving the overall display surface area.
2Illumination intensity
If different areas of reflective parts are used for different symbols, then luminance balance is achieved, but user comfort is reduced due to perceptible area differences
Solution Approach 1:
The patent implements local quality by positioning reflective parts at different locations along the light propagation direction and assigning different inclination angles to each position. This allows luminance balancing through spatial distribution rather than through varying the apparent area of symbols, thereby maintaining uniform visual appearance.
Solution Approach 2:
The patent moves the luminance balancing mechanism from the spatial dimension (area of reflective parts) to the angular dimension (inclination angles). By controlling the orientation of reflective surfaces rather than their area, the system achieves luminance uniformity without creating perceptible differences in symbol size or area.
3Illumination intensity
If the inclination angles of reflective surfaces are varied to achieve uniform luminance, then luminance uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by varying the inclination angles of reflective surfaces at different positions along the light propagation direction. Reflective surfaces closer to the light source have smaller inclination angles, while those farther away have larger inclination angles. This localized variation in surface orientation compensates for luminance differences without requiring uniform area changes across the entire display surface.
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 achieves uniform luminance across displayed symbols by optimizing the inclination angles of reflective surfaces, reducing perceptible luminance differences and enhancing user comfort.
Implementation Method 1
each of the reflective parts reflects the light incident from the first lateral surface from the plurality of reflective surfaces
Data Source
AI summary
A display device includes a light source, and a light guide which is transparent and flat, and into which light emitted from the light source is incident from a first lateral surface, wherein the light guide includes reflective parts at positions corresponding to respective symbols, the reflective parts each including a plurality of reflective surfaces inclined relative to a bottom surface of the light guide, each of the reflective parts reflects the light incident from the first lateral surface from the plurality of reflective surfaces, which results in displaying a corresponding one of the symbols on a display surface of the light guide, and the closer the reflective source, the smaller the parts are to the light inclination angles of the reflective surfaces relative to the bottom surface.