Touch Liquid Crystal Grating for 3D Display
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Solution Overview
Problem
Current 3D display technologies with touch functionality suffer from reduced light transmittance and increased fabrication costs due to the need for multiple electrode layers and conductive adhesives, which complicates the alignment and assembly process.
Innovation Solution
A touch liquid crystal grating with grating electrodes and touch driving/sensing electrodes on a single substrate, where grating electrodes are electrified to deflect liquid crystals in strip-like regions, while touch electrodes are positioned in spacing regions, allowing for 3D display and touch functionality with reduced electrode layers and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two layers of touch electrodes insulated from each other are added to the upper substrate of the liquid crystal grating, then touch functionality is achieved, but light transmittance is reduced
Solution Approach 1:
The patent combines grating electrodes and touch electrodes into a single integrated structure on one substrate. The grating electrodes are arranged in strip-like regions for 3D display, while touch electrodes are positioned in spacing regions, eliminating the need for separate electrode layers and maintaining high light transmittance while achieving both 3D display and touch functionality
Solution Approach 2:
The upper substrate is segmented into strip-like regions for grating electrodes and spacing regions for touch electrodes. This spatial segmentation allows different functional regions to coexist on the same substrate without requiring multiple complete electrode layers, thereby maintaining light transmittance while enabling touch functionality
2Reliability
If both the upper and lower substrates are provided with electrodes, then conduction of voltage signal is achieved, but fabrication cost increases due to conductive adhesive and alignment marks
Solution Approach 1:
The patent extracts the conduction function from the substrate structure by providing through-holes with conductive fillings that extend from the front surface to the back surface of the upper substrate. This eliminates the need for conductive adhesives and alignment marks, reducing fabrication complexity and cost while maintaining reliable voltage signal conduction between electrode layers
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 design achieves high light transmittance and low fabrication costs by minimizing the number of electrode layers and eliminating the need for conductive adhesives, while enabling simultaneous 3D display and touch functionality without interference between touch and grating signals.
Implementation Method 1
when the liquid crystal grating is electrified, liquid crystal molecules corresponding to the strip-like electrodes are deflected
Implementation Method 2
when a light enters from the lower polarizer, a polarized light parallel to an absorption axis of the lower polarizer enters the liquid crystal layer, will change its vibration direction upon passing through the liquid crystal molecules
Implementation Method 3
a plurality of touch driving electrodes, which extend along the first direction and are located on the side of the first substrate facing the liquid crystal layer, the touch driving electrodes being located within the spacing regions between adjacent strip-like regions; and a plurality of touch sensing electrodes
Data Source
AI summary
An embodiment of the present invention discloses a touch liquid crystal grating, its driving method and a 3D touch display device. The touch liquid crystal grating comprises: a first substrate and a second substrate; a liquid crystal layer; grating electrodes, located on a side of the first substrate facing the liquid crystal layer and extend along a first direction, each being located within each of strip-like regions with spacing regions being provided therebetween; touch driving electrodes, extending along the first direction and being located within the spacing regions between adjacent strip-like regions; and touch sensing electrodes, extending along a second direction, wherein the first direction is different from the second direction, and when the plurality of grating electrodes are electrified, liquid crystal molecules corresponding to each of the strip-like regions are deflected, and liquid crystal molecules corresponding to each of the spacing regions are not deflected.