Tilted Light Guide Plate for Display Device
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Solution Overview
Problem
In display devices, light emitted from the auxiliary emission region can incident into the main emission region, deteriorating the image quality and making it difficult to manufacture a compact design.
Innovation Solution
The display device incorporates a light-guide plate and tilted light sources in the auxiliary emission region, ensuring that light is directed away from the main emission region, using a configuration where the light incidence surfaces are tilted relative to the side edge, preventing light leakage and improving image quality while allowing for a reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source is disposed adjacent to the light-guide plate to supply light to the auxiliary emission region, then the auxiliary emission region can be illuminated, but light may be incident to the main emission region and gray scales of the image may be adversely affected
Solution Approach 1:
The light-guide plate is designed with an asymmetric tilted light incidence side surface rather than a symmetric perpendicular surface. This asymmetric geometry causes light from the light source to be refracted at an angle, directing it away from the main emission region while still illuminating the auxiliary emission region, thereby resolving the contradiction between providing illumination and preventing harmful light incidence.
Solution Approach 2:
The patent changes the geometric parameter of the light-guide plate's light incidence surface from a perpendicular orientation to a tilted orientation. This parameter change alters the light propagation path through refraction, ensuring that light is directed into the auxiliary emission region without incidenting into the main emission region, thus maintaining image quality while providing necessary illumination.
2Object-affected harmful factors
If additional blocking members are added to prevent light from entering the main emission region, then image quality can be maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the light direction control function from a separate blocking member and integrates it directly into the light-guide plate structure through the tilted light incidence surface. This eliminates the need for additional blocking members while maintaining the function of preventing light from entering the main emission region, thereby reducing device complexity and manufacturing cost.
Solution Approach 2:
The light-guide plate is designed to perform multiple functions: it guides light to the auxiliary emission region, controls light direction through its tilted surface, and simultaneously prevents light from incidenting into the main emission region. This multi-functionality eliminates the need for separate blocking members, reducing overall device complexity while maintaining image quality.
3Object-affected harmful factors
If the display device is designed with larger dimensions to accommodate light blocking structures, then light can be prevented from entering the main emission region, but the device size increases
Solution Approach 1:
By changing the geometric parameter of the light incidence surface to a tilted configuration, the patent achieves effective light control within the existing device footprint. This parameter change allows the light to be directed away from the main emission region without requiring additional space for blocking structures, thereby maintaining compact device dimensions while preventing harmful light incidence.
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 light transmission from the auxiliary to the main emission region, enhancing display quality and enabling the manufacture of a smaller display device without the need for additional blocking members, thus reducing manufacturing costs and complexity.
Implementation Method 1
a light-guide plate disposed in the auxiliary emission region when viewed in the viewing direction and comprising a first light incidence side surface, and a first light source disposed adjacent to the first light incidence side surface and facing the first light incidence side surface, wherein the first light incidence side surface is tilted with respect to the side edge or an imaginary straight line extending from the side edge
Data Source
AI summary
A display device includes an exterior surface; a main emission region comprising a side edge when viewed in a viewing direction perpendicular to the exterior surface; and an auxiliary emission region next to the side edge when viewed in the viewing direction. The device further includes a light-guide plate disposed in the auxiliary emission region when viewed in the viewing direction; and a first light source disposed adjacent to the light-guide plate and configured to emit light in a first direction to supply the light to the light-guide plate. An imaginary straight line extending from the first light source in the first direction is tilted with respect to the side edge while not crossing the side edge.