Image Display Optical Member with Visible Light Absorber
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Solution Overview
Problem
Image display devices with touch sensors experience a decrease in contrast and an increase in brightness of black display when black and white are simultaneously displayed, particularly affecting the performance of white display brightness.
Innovation Solution
Incorporating a visible light absorber into the substrate of the touch sensor to reduce light transmission and propagation within the substrate, thereby maintaining white display brightness and enhancing contrast between black and white displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is added to the image display device, then touch functionality is provided, but contrast between black and white display deteriorates and black display brightness increases
Solution Approach 1:
A light blocking layer is introduced as an intermediary component between the touch sensor substrate and the display. This layer selectively blocks light in specific regions to prevent light leakage from white display areas to black display areas, thereby restoring contrast without compromising touch sensor functionality.
Solution Approach 2:
The light blocking layer is applied locally only in regions where light leakage occurs between white and black display areas, rather than uniformly across the entire display. This localized approach maintains contrast where needed while preserving overall display brightness and touch sensor performance.
2Adaptability or versatility
If a touch sensor is added to the image display device, then touch functionality is provided, but white display brightness decreases
Solution Approach 1:
The light blocking layer acts as a mediator that prevents lateral light leakage without blocking vertical light transmission from the white display areas. This selective blocking mechanism maintains white display brightness while eliminating the contrast deterioration caused by light leakage to adjacent black areas.
Solution Approach 2:
The light blocking layer uses optical properties (absorption or reflection) to selectively manage light paths. By controlling which light paths are blocked and which are permitted, the layer maintains white display brightness while preventing unwanted light leakage that would reduce contrast.
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 suppresses the increase in black display brightness and improves contrast without impairing white display brightness, achieving display characteristics comparable to devices without touch sensors.
Implementation Method 1
a visible light absorber is incorporated into a substrate of a touch sensor
Data Source
AI summary
An image display device that is excellent in contrast between black display and white display and is excellent in the performance of suppressing a decrease in white display brightness when black and white display is made. The image display device includes an image display element having a display region and a non-display region; and an optical member covering the display region. A refractive index of the optical member is 1.55 or more, the optical member contains a visible light absorber α, and the optical member has an internal absorbance A2 of 0.0004 to 0.03 and a parameter X2 of 30 to 3,000 m−1, the internal absorbance A2 and the parameter X2 being calculated with Test X2.