Touch Panel with Integrated Polarizer and Liquid Gap
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Solution Overview
Problem
Existing touch panels degrade the optical performance of display devices due to air gaps and spacer disruptions, especially when integrated with liquid crystal displays, as they introduce moisture, particulates, and birefringence issues.
Innovation Solution
A touch panel design that integrates a front polarizer layer into a flexible transparent membrane with a rigid base, using transparent conductive layers and a non-birefringent material to minimize optical interference, and fills the gap between the conductive layers with a transparent insulating liquid to reduce reflections and improve alignment with display components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate touch panel is mounted atop the display device, then touch functionality is achieved, but optical performance is degraded due to air gaps and spacer disruptions
Solution Approach 1:
The patent merges the touch panel with the display device by integrating the front polarizer layer into the flexible membrane of the touch panel. This integration eliminates the air gap between the touch panel and display, removing the source of optical degradation while maintaining touch functionality. The flexible membrane now serves dual purposes: as a touch-sensitive component and as an optical element that is part of the display assembly.
Solution Approach 2:
The patent uses a transparent insulating liquid as an intermediary substance to fill the gap between the transparent conductive layers. This liquid mediator eliminates the air gap that causes optical degradation, while the spacing means maintains the necessary electrical insulation. The transparent insulating liquid acts as both a gap-filling material and an optical interface that preserves display quality.
2Ease of operation
If spacers are used to separate flexible membrane from base plate, then touch sensitivity is enabled, but viewing is disrupted due to spacer alignment issues
Solution Approach 1:
The patent merges the spacer function into the integrated flexible membrane structure. The flexible membrane itself, now containing the front polarizer layer, serves as both the touch-sensitive element and the spacing element. This eliminates the need for separate spacers that would disrupt viewing, as the membrane's thickness and structure provide the necessary separation while maintaining optical clarity.
3Ease of manufacture
If air gap is introduced between touch panel and display, then touch panel mounting is simplified, but moisture and particulates accumulate
Solution Approach 1:
The patent uses a transparent insulating liquid as an intermediary to eliminate the air gap that allows moisture and particulate accumulation. The liquid fills the gap between the transparent conductive layers, creating a sealed environment that prevents contamination while maintaining the necessary electrical insulation for touch functionality.
Solution Approach 2:
The patent applies the principle of using a liquid (hydraulic principle) instead of air to fill the gap between components. The transparent insulating liquid provides a sealed, contamination-free environment that prevents moisture and particulate accumulation, while the spacing means ensures proper electrical insulation. This hydraulic approach replaces the pneumatic air gap with a liquid-filled sealed space.
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
Enhances optical performance by increasing transmission, reducing specular and diffuse reflections, and allowing precise alignment of spacers to avoid interference with display pixels, resulting in improved visual clarity and reduced moiré patterns.
Implementation Method 1
fills the gap between the conductive layers with a transparent insulating liquid to reduce reflections and improve alignment with display components
Implementation Method 2
integrates a front polarizer layer into a flexible transparent membrane
Implementation Method 3
liquid crystal display device
Data Source
AI summary
A touch panel is integrated into a flat panel display device having a visual display surface with a front polarizer layer, particularly a liquid crystal display device. The touch panel comprises a flexible transparent membrane containing the front polarizer layer and having a first transparent conductive layer on a lower surface of the flexible transparent membrane and a rigid base comprising the flat panel display device and having a second transparent conductive layer on an upper surface of the rigid base. At least one spacer separates the flexible transparent membrane from the rigid base, keeping the first and second transparent conductive layers in spaced-apart facing relationship. A bus bar and tail communicate a signal from the touch panel to the flat panel display device.