Display Window Light-Path Changing Layer for Light Leakage Reduction
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Solution Overview
Problem
Display devices experience light leakage due to total reflection in the non-display areas, which affects the overall image quality and visibility.
Innovation Solution
Incorporating a light-path changing layer with an optical structure having a refractive index less than the resin, combined with a light-absorbing member, between the window base and the printing layer to redirect and absorb reflected light, thereby reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a printing layer is applied to the non-display area to design various colors, then the aesthetic appearance is improved, but light leakage occurs due to total reflection
Solution Approach 1:
A light-path changing layer is introduced as an intermediary component between the window base and the printing layer. This layer contains optical structures (such as microlens arrays or prism structures) that redirect reflected light away from the printing layer, preventing light leakage while allowing the printing layer to maintain its aesthetic function.
Solution Approach 2:
The refractive index parameters of the light-path changing layer are specifically optimized to control light reflection and refraction. By adjusting the refractive index of the optical structures within this layer, the patent achieves effective light path modification to prevent total reflection into the non-display area.
2Illumination intensity
If the window base is made transparent to allow image transmission, then the display function is improved, but reflected light reaches the printing layer causing light leakage
Solution Approach 1:
The light-path changing layer serves as a mediator that intercepts reflected light before it reaches the printing layer. The optical structures within this intermediary layer actively redirect the light paths, allowing the window base to remain transparent for image transmission while preventing harmful light leakage.
Solution Approach 2:
The patent converts the harmful total reflection phenomenon into a beneficial effect by using the reflected light to highlight the optical structures in the light-path changing layer. These structures then redirect the light in controlled patterns, transforming what was previously a harmful leakage issue into a functional light management mechanism.
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 effectively minimizes light leakage by changing the path of reflected light and absorbing it, enhancing image quality and visibility in display devices.
Implementation Method 1
The optical structure may have a refractive index that is less than that of the resin by 0.01 or more
Implementation Method 2
combined with a light-absorbing member to absorb any remaining light
Data Source
AI summary
A display device includes: a display panel to display an image; a window covering the display panel, and including a display area through which the image is to be transmitted, and a non-display area surrounding the display area, the window including: a window base opposite the display panel; a printing layer below the window base; and a light-path changing layer between the window base and the printing layer, the light-path changing layer including: an optical structure; and a resin coating the optical structure; and an adhesive layer between the display panel and the window.