Mirror Display Structure to Reduce Ghosting and Rainbow Effects
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Solution Overview
Problem
Touch panel-equipped mirror displays experience distortion, ghosting, and rainbow effects due to warping of reflective polarizers and phase differences caused by touch panels, which affect both mirror images and displayed images.
Innovation Solution
A touch panel-equipped mirror display configuration where a mirror plate with a fixed reflective polarizer and substrate is placed on the viewing side, and a touch panel that does not create a phase difference in light is used, reducing distortion and ghosting in mirror images and eliminating the rainbow effect in displayed images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a reflective polarizer is fixed to a soft film transparent resistive member, then the touch panel can be manufactured with ease, but the reflective polarizer becomes warped causing mirror image distortion
Solution Approach 1:
The patent changes the material parameter of the transparent resistive member from a soft film to a rigid substrate. This parameter change eliminates the warping issue while maintaining manufacturability, as the rigid substrate provides sufficient structural support to keep the reflective polarizer flat.
2Adaptability or versatility
If a touch panel is placed between the display device and mirror plate, then touch functionality is added, but phase difference is created causing rainbow effect in displayed images
Solution Approach 1:
The patent changes the optical parameter of the touch panel by selecting materials and结构设计 that minimize phase difference. The touch panel is designed to have negligible birefringence effects, allowing it to maintain touch functionality while eliminating the rainbow effect in displayed images.
3Ease of manufacture
If the reflective polarizer is made from a soft film, then the manufacturing process is simplified, but mirror image distortion occurs due to warping
Solution Approach 1:
The patent changes the mechanical parameter of the support structure from soft film to rigid substrate. This parameter change maintains manufacturing simplicity while ensuring the reflective polarizer remains flat, thereby preventing mirror image distortion.
4Ease of operation
If a conventional touch panel configuration is used, then touch sensitivity is achieved, but ghosting appears in mirror images due to multiple reflections
Solution Approach 1:
The patent introduces a mirror plate as an intermediary element positioned on the viewing side of the touch panel. This mirror plate provides the primary reflection surface, reducing unwanted multiple reflections from the touch panel layers themselves, thereby minimizing ghosting while preserving touch sensitivity.
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 reduces distortion and ghosting in mirror images while minimizing the rainbow effect in displayed images, enhancing the overall image quality and visibility.
Implementation Method 1
a mirror plate 5 including a reflective polarizer 11 and a substrate 12
Implementation Method 2
reflective polarizer 211 that are arranged in that order from the rear side to the viewing side
Implementation Method 3
a touch panel 4 that does not create a phase difference in light
Implementation Method 4
a liquid crystal display device 2 including a backlight 6 and a liquid crystal panel 7
Data Source
AI summary
One aspect of the present invention provides a touch panel-equipped mirror display that can reduce distortion and ghosting in mirror images while also reducing the rainbow effect in displayed images. The touch panel-equipped mirror display according to one aspect of the present invention includes, in order from a rear side: a display device that includes a polarizer; a touch panel; and a mirror plate that includes a reflective polarizer and a substrate, wherein the reflective polarizer and the substrate are fixed together, and wherein the touch panel does not create a phase difference in light. It is preferable that the substrate be a glass substrate with a thickness of greater than or equal to 0.1 mm and less than or equal to 0.4 mm.