Touch Display Wiring Layout for Uniform Luminance
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Solution Overview
Problem
Display devices with touch detection functions often suffer from image defects due to asymmetrical wiring arrangements, leading to capacitance imbalances between the screen and peripheral regions, which result in luminance differences and vertical stripe patterns on the display.
Innovation Solution
The implementation of a display device configuration where dummy wiring and sensor wiring are arranged symmetrically with respect to the center line, overlapping with data signal supply lines via an insulating layer, ensuring equal capacitive loads and suppressing image defects by maintaining consistent signal potentials across all data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If asymmetrical wiring arrangements are used in display devices with touch detection functions, then device complexity is reduced and ease of manufacture is improved, but capacitance imbalances occur between screen and peripheral regions, resulting in luminance differences and vertical stripe patterns
Solution Approach 1:
The patent applies asymmetry principle by intentionally introducing dummy wirings in the screen region to counterbalance the asymmetrical wiring arrangements in peripheral regions. This creates a symmetrical capacitive load distribution that eliminates luminance non-uniformity while maintaining the manufacturing simplicity of asymmetrical wiring layouts.
Solution Approach 2:
The patent changes the capacitive load parameter by adding dummy wirings with specific capacitance values to balance the total capacitance between screen and peripheral regions. This parameter adjustment equalizes the RC time constants, eliminating vertical stripe patterns and luminance differences.
2Manufacturing precision
If dummy wirings are added to balance capacitive loads, then luminance uniformity is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The dummy wirings serve multiple functions: they balance capacitive loads to eliminate luminance non-uniformity, provide additional signal routing paths, and maintain electrical connectivity. This multi-functionality reduces the need for separate compensation circuits, thereby limiting the increase in device complexity.
Solution Approach 2:
The dummy wirings are designed as simplified copies of the functional sensor wirings, replicating their capacitive characteristics without the full sensing functionality. This copying approach achieves capacitance balancing while keeping the dummy wirings structurally simple and easy to manufacture.
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 effectively eliminates image defects by equalizing capacitive loads and signal potentials, resulting in uniform luminance across the display, thereby enhancing the display quality and reducing vertical stripe patterns.
Implementation Method 1
a dummy wiring 124 arranged in the first region 44 and not connected to the sensor electrode 128, and a sensor wiring 126 connected to the sensor electrode 128, wherein the dummy wiring 124 is overlapped with at least a portion of the first data signal supply line 134 via an insulating layer 168
Data Source
AI summary
A display device with touch detection function includes a display unit having a first and a second data lines, a first region outside the display unit, a second region on an opposite side of the first region sandwiching the display unit with the first region, a sensor unit including a sensor electrode, a first data signal supply line connected to the first data line and arranged in the first region, a second data signal supply line connected to the second data line and arranged in the second region, a dummy wiring arranged in the first region and not connected to the sensor electrode, and a sensor wiring arranged in the second region and connected to the sensor electrode. A line length of the dummy wiring in the first region is substantially same as a line length of the sensor wiring in the second region.