In-Cell Touch LCD Pixel Electrode Top Structure
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Solution Overview
Problem
In-cell touch liquid crystal display devices face manufacturing complexity and increased cost due to separate production of liquid crystal panels and touch screens, and the common electrode top pixel structure leads to light transmittance issues causing mixed colors among pixels.
Innovation Solution
The in-cell touch liquid crystal display device features a pixel electrode top structure with a thin film transistor, source and drain contact layers, passivation layers, a common electrode, conductive lines, and a pixel electrode, manufactured using a process that reduces the number of masks required and optimizes the arrangement to prevent mixed colors by ensuring high light transmittance at the pixel center and low transmittance at the periphery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common electrode top pixel structure is used, then the manufacturing process is simplified, but light transmittance at the pixel edge is reduced causing mixed colors
Solution Approach 1:
The patent inverts the traditional electrode arrangement by placing the pixel electrode on the upper substrate instead of the common electrode, creating a pixel electrode top structure. This inversion resolves the light transmittance issue at pixel edges while maintaining manufacturing simplicity through the in-cell touch integration
2Manufacturing precision
If separate production of liquid crystal panels and touch screens is performed, then manufacturing precision is maintained, but device complexity and cost increase
Solution Approach 1:
The patent merges the touch sensor function with the liquid crystal display cell structure by integrating the common electrode as a touch electrode and incorporating touch sensing capabilities within the existing pixel structure, eliminating the need for separate touch screen production while maintaining manufacturing precision
Solution Approach 2:
The common electrode serves dual functions as both the liquid crystal common electrode and the touch sensor electrode, allowing the same structure to perform both display and touch sensing functions, thereby reducing device complexity and manufacturing steps
Data Source
AI summary
An in-cell touch liquid crystal display device and a method for manufacturing the same are disclosed in which color mixing among pixels can be prevented. The in-cell touch liquid crystal display device includes a thin film transistor (TFT) arranged in a plurality of pixel areas; a source contact layer connected to a source electrode of the TFT and a drain contact layer connected to a drain electrode of the TFT; first and second passivation layers on the source contact layer and the drain contact layer; a common electrode on the second passivation layer; a third passivation layer on the common electrode; a conductive line to overlap the common electrode by passing through the third passivation layer; a fourth passivation layer on the third passivation layer and the conductive line; and a pixel electrode on the fourth passivation layer connected to the drain contact layer in a first contact hole.