Touch Display Stack Without Polarizer for Reflection Control
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Solution Overview
Problem
The thickness of display devices is increased due to the use of thick polarizing films, which are necessary to prevent external light reflection.
Innovation Solution
A display device design that incorporates a conductive pattern and a mesh-shaped detection part configuration, along with a specific insulating layer arrangement, to reduce thickness while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing film is used to prevent external light reflection, then light reflection prevention is improved, but device thickness increases
Solution Approach 1:
The patent extracts and removes the polarizing film from the display device structure. Instead of using a polarizing film to prevent external light reflection, the invention uses an input detection part with detection parts arranged in a matrix pattern that can detect touches without requiring the polarizing film, thereby reducing device thickness while maintaining functionality.
Solution Approach 2:
The input detection part serves multiple functions: it detects user touches and simultaneously provides external light reflection prevention without needing a separate polarizing film. The detection parts arranged in a matrix pattern enable both touch detection and optical control functions, reducing the need for additional components and thereby reducing overall device thickness.
2Object-affected harmful factors
If a polarizing film is used to prevent external light reflection, then light reflection prevention is improved, but input detection capability may be compromised
Solution Approach 1:
The input detection part is designed to perform both external light reflection prevention and touch detection functions simultaneously. The detection parts arranged in a matrix pattern enable the structure to serve dual purposes, eliminating the need for a separate polarizing film and ensuring that input detection capability is maintained without compromise.
Solution Approach 2:
The input detection part is divided into multiple detection parts arranged in a matrix pattern, allowing each segment to contribute to both light reflection prevention and touch detection. This segmentation enables the system to maintain input detection capability while providing external light reflection prevention without relying on a polarizing film.
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 proposed design effectively reduces the overall thickness of the display device without compromising on light reflection prevention and input detection capabilities.
Implementation Method 1
a second insulating layer disposed on the color filter layer, the first insulating layer, and the black matrix and configured to fill the opening parts, wherein a refractive index of the second insulating layer is greater than a refractive index of the first insulating layer
Data Source
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AI summary
Provided is a display device that includes a display panel including a plurality of light emitting areas and a non-light emitting area between the light emitting areas, an insulating layer disposed on the display panel, a first conductive pattern overlapping the non-light emitting area and directly disposed on the insulating layer, a color filter layer overlapping the light emitting areas and disposed on the insulating layer, a first insulating layer disposed on the first conductive pattern and the color filter layer and in which opening parts overlapping the light emitting areas are defined, and a second conductive pattern overlapping the non-light emitting area and disposed on the first insulating layer.