Dual Liquid Crystal Display with Spacer Layer for Touch Accuracy
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Solution Overview
Problem
Touch display apparatuses with anti-peeping functions face issues with touch accuracy due to changes in coupling capacitance caused by deformation of the touch display panel under pressure, leading to abnormal or invalid touch sensing.
Innovation Solution
Incorporating a first and second electrically controlled liquid crystal cell with a spacer or conductive layer between them, where the touch electrode layer is disposed inside the first liquid crystal cell, helps to minimize changes in coupling capacitance during touch events, thereby improving touch accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electrically controlled privacy sheet is disposed between the touch display panel and the backlight module to achieve anti-peeping function, then privacy protection is improved, but touch accuracy deteriorates due to coupling capacitance changes caused by panel deformation
Solution Approach 1:
A support structure is introduced as an intermediary component between the first electrically controlled liquid crystal cell (privacy sheet) and the second electrically controlled liquid crystal cell (touch display panel). This support structure physically separates the two cells, preventing direct contact and the resulting coupling capacitance changes that occur when the touch panel deforms under pressure. The intermediary structure maintains the privacy function while eliminating the harmful capacitive coupling effect.
Solution Approach 2:
The display apparatus is divided into distinct functional modules: a first electrically controlled liquid crystal cell for privacy control, a support structure for mechanical separation, and a second electrically controlled liquid crystal cell for touch display. This segmentation allows each component to perform its specific function independently, preventing the deformation of the touch panel from directly affecting the privacy sheet and thus maintaining stable coupling capacitance characteristics.
2Measurement precision
If the touch electrode layer is disposed inside the first electrically controlled liquid crystal cell, then touch sensitivity is improved, but structural complexity increases
Solution Approach 1:
The touch electrode layer is merged with the first electrically controlled liquid crystal cell structure, combining the touch sensing function and the privacy control function into a single integrated component. This merging eliminates the need for separate touch electrode structures and reduces overall structural complexity while maintaining or improving touch sensitivity through the liquid crystal medium's capacitive properties.
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 configuration effectively suppresses capacitive coupling effects and reduces deformation of the touch display panel, enhancing the accuracy of touch sensing and maintaining valid touch point identification.
Implementation Method 1
a first electrically controlled liquid crystal cell (100) and a second electrically controlled liquid crystal cell (200)
Implementation Method 2
a first liquid crystal layer (LCL1) disposed between the first substrate (SUB1) and the second substrate (SUB2)
Implementation Method 3
the coupling capacitance between the touch electrode layer in the touch display panel and the electrode layer in the electrically controlled privacy sheet is easily changed due to the deformation of the touch display panel by touch pressure
Data Source
AI summary
A display apparatus, including a first electrically controlled liquid crystal cell and a second electrically controlled liquid crystal cell, is proposed. The first electrically controlled liquid crystal cell includes a first substrate, a second substrate, a first liquid crystal layer, and a touch electrode layer. The first liquid crystal layer and the touch electrode layer are disposed between the first substrate and the second substrate. The second electrically controlled liquid crystal cell is disposed on one side of the first substrate of the first electrically controlled liquid crystal cell and overlapping the first electrically controlled liquid crystal cell. A spacer layer or a conductive layer is disposed between the first electrically controlled liquid crystal cell and the second electrically controlled liquid crystal cell, and the spacer layer or the conductive layer is disposed on a surface of the first substrate facing away from the first liquid crystal layer.