LCD Touch Panel Phase Compensation for Reflectance Reduction
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Solution Overview
Problem
Conventional LCD devices with touch screen functions suffer from reduced outdoor visibility due to increased surface reflectance caused by air gaps in the touch panel, which affects viewing angles and image quality.
Innovation Solution
The introduction of a phase compensating or polarization means within the air gap area of the touch panel, utilizing phase retardation films and polarizers to eliminate the air gap and enable electrode contact, thereby reducing surface reflectance and enhancing outdoor visibility and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spacer is disposed inside the touch panel to maintain air gap, then the touch panel structure is maintained, but surface reflectance is increased and outdoor visibility is deteriorated
Solution Approach 1:
The invention extracts and removes the air gap from the touch panel structure by eliminating the spacer component. The upper and lower substrates are brought into direct contact, removing the harmful air interface that causes increased surface reflectance and deteriorated outdoor visibility.
Solution Approach 2:
The invention merges the upper substrate and lower substrate by eliminating the air gap between them. The substrates are directly contacted through patterned transparent electrodes, combining what were previously separated optical paths into a unified structure that reduces reflectance.
2Object-affected harmful factors
If phase compensating means is formed in the air gap area, then outdoor visibility and viewing angle characteristics are improved, but the air gap must be eliminated for electrode contact
Solution Approach 1:
The invention applies local quality by forming phase compensating means with specific optical properties in the air gap area. The transparent electrodes are patterned with specific geometries (such as interdigitated or mesh patterns) that provide both electrical functionality and optical phase compensation locally, improving outdoor visibility and viewing angle characteristics.
Solution Approach 2:
The transparent electrodes serve multiple functions: they provide electrical contact for touch sensing and simultaneously act as phase compensating means for optical performance. This multi-functionality eliminates the need for separate air gap maintenance structures while achieving both touch functionality and improved optical characteristics.
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 solution effectively improves outdoor visibility and viewing angles by reducing surface reflectance and maintaining the compactness and cost-effectiveness of the LCD device, while eliminating the need for a discrete spacer.
Implementation Method 1
an air gap is removed by forming a phase compensating means or a polarization means in an air gap area formed inside the existing touch panel
Implementation Method 2
an air gap is removed by forming a phase compensating means or a polarization means in an air gap area formed inside the existing touch panel
Data Source
AI summary
A liquid crystal display (LCD) device with a touch screen function is provided. The LCD device includes a liquid crystal panel layer including a liquid crystal layer filled between first and second substrates, and a touch panel layer which is formed on the first substrate, includes at least one phase compensating means stacked therein, and detects a contact point when an upper electrode and a lower electrode come into contact with each other due to external pressure, wherein the phase compensating means is patterned so that the upper electrode and the lower electrode are able to contact each other, and thus outdoor visibility and viewing angle characteristics can be effectively improved.