In-Cell Touch Display Field Blocking Line Light Leakage
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Solution Overview
Problem
In-cell touch type liquid crystal display devices experience light leakage at the border regions between touch blocks due to voltage differences, leading to display quality deterioration even in black states.
Innovation Solution
The implementation of a field blocking line between sub-pixels, which applies a voltage different from or the same as the data lines, and includes a layer of the same material and structure as the data lines, to prevent electric field-driven liquid crystal molecule rearrangement in border regions, thereby blocking the electric field and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common electrodes are separated by touch blocks to enable touch sensing, then touch functionality is achieved, but light leakage occurs at border regions between touch blocks
Solution Approach 1:
A field blocking line is introduced as an intermediary element between adjacent touch blocks. This field blocking line includes a second electrode that applies a common voltage to cancel out the electric field in the border region between touch blocks, thereby preventing light leakage while preserving touch sensing functionality. The field blocking line acts as a mediator that resolves the conflict between touch block separation and border region display quality.
2Ease of operation
If voltage is applied to common electrodes during non-display period for touch sensing, then touch capacitance is generated, but voltage difference drives liquid crystal molecules causing light leakage in black state
Solution Approach 1:
The field blocking line applies a common voltage to the second electrode in advance during the non-display period when touch sensing is performed. This preliminary voltage application creates an opposing electric field that cancels out the voltage difference between adjacent touch blocks, preventing the liquid crystal molecules from being driven and thus preventing light leakage before it can occur during the black state display period.
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 prevents light leakage between touch blocks, enhancing the display quality by ensuring that liquid crystal molecules in border regions are not driven by electric fields during black states, thus maintaining image integrity.
Implementation Method 1
a voltage difference is generated between the common electrode of the touch block which is touched and the common electrode of the other touch blocks which are not touched. Thus, even in a black state, light leakage may occur at the border region between the touch blocks, because the liquid crystal molecules in the border region are driven by an electric field generated by the voltage difference.
Implementation Method 2
the liquid crystal molecules in the border region are driven by an electric field generated by the voltage difference
Data Source
AI summary
The present disclosure describes a liquid crystal display device including: a substrate including first and second touch blocks adjacent to each other, the first and second touch blocks including first and second sub-pixels, respectively; a first electrode in each of the first and second sub-pixels; a second electrode in each of the first and second touch blocks, such that the second electrode of the first touch block and the second electrode of the second touch block are separated from each other; first and second data lines disposed at side portions of the first and second sub-pixels, respectively; and a field blocking line between the first and second sub-pixels, wherein the first and second sub-pixels face into each other between the first and second touch blocks.