Touch Sensor Routing Wires on Black Matrix for Vertical Field Displays
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Solution Overview
Problem
The existing horizontal electric field type touch sensor-integrated liquid crystal display devices are not applicable to vertical electric field type displays, leading to issues such as reduced aperture ratio and difficulty in connecting metal lines from the color filter array to the source driver and touch ICs in vertical electric field type devices.
Innovation Solution
A touch sensor-integrated display device with routing wires made of metal material disposed on a black matrix in the color filter array, connected to touch electrodes acting as common electrodes, which do not reduce the aperture ratio and can be easily connected to the thin film transistor array, allowing for seamless integration in a vertical electric field type display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If routing wires are disposed on the color filter array in vertical electric field type displays, then connection to touch electrodes is enabled, but aperture ratio is reduced
Solution Approach 1:
The routing wires are moved from the color filter array layer to the black matrix layer, utilizing a different spatial dimension/layer. This allows the wires to be positioned in a non-display area where they do not reduce the aperture ratio, while still maintaining electrical connection to the touch electrodes through vertical vias.
Solution Approach 2:
The black matrix serves as an intermediary layer that hosts the routing wires. The black matrix is positioned between the color filter array and the TFT array, providing a platform for wire routing without interfering with the light transmission area of the color filters.
2Adaptability or versatility
If common electrode is segmented into touch electrodes in vertical electric field type, then touch sensing is enabled, but metal line connection becomes difficult
Solution Approach 1:
The routing wires are positioned on the black matrix layer rather than the color filter array layer, creating a layered structure that simplifies connections. The black matrix layer acts as an intermediate plane that facilitates easier routing to the TFT array where source driver and touch ICs are located.
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 prevents a reduction in aperture ratio and facilitates easy connection of metal lines to the necessary ICs, enabling the successful implementation of a vertical electric field type touch sensor-integrated liquid crystal display device.
Implementation Method 1
driven to apply a vertical electric field to the liquid crystals
Implementation Method 2
a liquid crystal display panel with a thin film transistor array and a color filter array disposed to face each other with a liquid crystal layer interposed between them
Implementation Method 3
both a common electrode and a pixel electrode are formed on a transparent substrate (i.e., lower transparent substrate) of a thin film transistor array to apply a horizontal electric field to the liquid crystals
Data Source
AI summary
A touch sensor-integrated display device is provided which does not suffer from a reduction in aperture ratio. The touch sensor-integrated display device includes first and second substrates, color filters that are defined by a black matrix in the active area of the second substrate and arranged in a first direction and a second direction crossing the first direction, touch electrodes that are arranged in the first and second directions so as to overlap the color filters, and a plurality of routing wires that are arranged on the black matrix and are respectively connected to the touch electrodes and extend to the bezel area.