In-cell touch panel electrode gap overlapping color filter
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Solution Overview
Problem
In-cell touch panels of the mutual capacitance type face a reduction in brightness due to light absorption or scattering by the transmitter and receiver electrodes, which are necessary for display functionality.
Innovation Solution
The design includes a first substrate with color filters and electrodes where the transmitter and receiver electrodes are positioned to avoid overlapping with the green color filter, which has the highest luminosity for humans, thereby minimizing light loss and maintaining display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmitter electrode and receiver electrode are provided in the touch sensor array for mutual capacitance type touch detection, then touch sensing function is improved, but light absorption and scattering increase causing display brightness to decrease
Solution Approach 1:
The patent applies local quality by making the electrodes transparent in regions where they overlap with color filters, while maintaining their conductive function in other regions. Specifically, the transmitter and receiver electrodes are designed with transparent portions in the green color filter region (where human eyes are most sensitive) and non-transparent portions in the black matrix region, thereby locally optimizing both light transmission and touch sensing performance
Solution Approach 2:
The patent utilizes color changes by matching the transparency of electrodes to the color filter characteristics. The electrodes are made transparent in the green color filter region (which has highest luminosity for humans) and non-transparent in the black matrix region, thereby optimizing light transmission in the most perceptible wavelength range while maintaining touch detection functionality
2Measurement precision
If electrodes are made opaque to ensure good electrical conductivity for touch detection, then touch sensing precision is improved, but light transmission is blocked causing display brightness to decrease
Solution Approach 1:
The patent applies local quality by making the electrodes transparent in regions where they overlap with color filters, while maintaining their conductive function in other regions. Specifically, the transmitter and receiver electrodes are designed with transparent portions in the green color filter region (where human eyes are most sensitive) and non-transparent portions in the black matrix region, thereby locally optimizing both light transmission and touch sensing performance
Solution Approach 2:
The patent uses composite materials by combining transparent conductive oxide materials (such as ITO, IZO, or AZO) for the electrode layers. These composite transparent conductive materials enable the electrodes to maintain good electrical conductivity for touch detection while allowing light transmission, thereby resolving the contradiction between conductivity and light transmission
Data Source
AI summary
An in-cell touch panel device includes a first substrate, a plurality of color filters formed on an upper layer with respect to the first substrate and including a green color filter, a transmitter electrode formed on an upper layer with respect to the plurality of color filters, a receiver electrode formed on a lower layer with respect to the plurality of color filters, and a second substrate including a pixel electrode disposed on the second substrate. The transmitter electrode includes a gap portion formed in a portion overlapping the receiver electrode in a plan view and in a portion overlapping the green color filter in a plan view.