Touch Layer Polarizer Stack for Thinner LCD Displays
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Solution Overview
Problem
Existing electronic apparatuses with touch-operable display devices are not thin enough, and there is a demand for thinner display devices with a touch function.
Innovation Solution
A display device configuration that includes a first polarizer, a second polarizer, a liquid crystal cell, and a touch function layer with electrodes forming a multilayer structure, where the touch function layer is positioned between the polarizers, and a manufacturing method using recess forming tools to create electrodes on the first polarizer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch function layer is added to the display device, then the touch function is achieved, but the display device thickness increases
Solution Approach 1:
The patent combines the touch function layer with the liquid crystal cell structure by positioning the touch function layer between the first polarizer and the liquid crystal cell, merging multiple functions into a unified structure that reduces overall thickness
Solution Approach 2:
The patent employs a multilayer structure for the electrode, stacking conductive layers in the thickness direction to achieve touch functionality without increasing the planar footprint or overall device thickness
2Reliability
If traditional electrode formation methods are used, then the electrode is formed, but the manufacturing cost increases and production becomes more complex
Solution Approach 1:
The patent uses a recess forming tool with protruding portions that directly form the electrode structure through self-aligned recess formation and material filling, eliminating the need for complex photolithography and etching processes
Solution Approach 2:
The patent replaces traditional chemical etching and photolithography processes with a mechanical pressing method using protruding portions to form recesses and deposit material, simplifying the manufacturing process and reducing costs
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 results in a thinner display device with reduced manufacturing costs and ease of production, allowing the same chassis to accommodate both touch-enabled and non-touch-enabled display devices, thereby reducing overall thickness and production expenses.
Implementation Method 1
a liquid crystal cell between the first polarizer and the second polarizer
Implementation Method 2
a first polarizer having a first main surface; a second polarizer disposed closer to the rear surface than the first polarizer, the second polarizer to be opposed to the first main surface of the first polarizer
Data Source
AI summary
A display device having a rear surface includes: a first polarizer having a first main surface; a second polarizer disposed closer to the rear surface than the first polarizer, the second polarizer to be opposed to the first main surface of the first polarizer; a liquid crystal cell between the first polarizer and the second polarizer; and a touch function layer between the first polarizer and the liquid crystal cell, the touch function layer having an electrode that detects a touch input, the touch function layer being disposed on the first main surface of the first polarizer.