Display Device Sensor Line Segmentation for Luminance Uniformity
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Solution Overview
Problem
In display devices with built-in touch sensors, differences in time constants among sensor electrodes due to varying lengths of sensor lines can lead to degradation in display quality, causing uneven luminance and visual recognition of boundaries between different areas of the display.
Innovation Solution
The display device is configured with the same number of sensor lines connected to each sensor electrode, ensuring minimal difference in time constants between sensor lines, and using dummy lines to reduce parasitic capacitance and enhance signal integrity, thereby maintaining consistent display luminance across the entire area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensor lines of different lengths are used to connect sensor electrodes in a matrix arrangement, then the touch sensor can cover the entire display area, but differences in time constants among sensor electrodes occur causing degradation in display quality
Solution Approach 1:
The sensor lines are divided into multiple segments with different numbers of wiring lines in different regions. The display area is segmented into a first area with sensor lines having a first number of wiring lines and a second area with sensor lines having a second number of wiring lines, allowing different time constants to be compensated for in different regions
Solution Approach 2:
Different regions of the display are assigned different wiring line configurations tailored to their specific needs. The first area uses a different number of wiring lines compared to the second area, optimizing each region's performance characteristics rather than applying a uniform design throughout
2Manufacturing precision
If the number of wiring lines varies in different areas, then time constant differences can be compensated, but the device structure becomes more complex
Solution Approach 1:
The complex wiring structure is segmented into manageable regions with distinct configurations. By dividing the display into first and second areas with different wiring line numbers, the complexity is organized and controlled rather than uniformly distributed
Solution Approach 2:
The number of wiring lines is changed as a key parameter to compensate for time constant differences. By adjusting this physical parameter in different regions, the patent achieves time constant uniformity without requiring complex active compensation circuits
3Adaptability or versatility
If sensor lines are extended to cover peripheral areas, then touch detection capability is improved, but parasitic capacitance increases affecting signal integrity
Solution Approach 1:
The sensor line structure is segmented into multiple wiring lines with different quantities in different regions. This segmentation allows the patent to extend touch detection coverage while controlling parasitic capacitance by using fewer wiring lines in regions where extended coverage is less critical
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 suppresses visual differences in display luminance and reduces parasitic capacitance, maintaining high display quality by ensuring consistent signal transmission and reducing the visibility of boundaries between different areas.
Implementation Method 1
a different in the length of a sensor line connected to each sensor electrode or the like causes a difference in time constant among the sensor electrodes
Data Source
AI summary
According to one embodiment, a display device includes a display portion including a first electrode, a second electrode, first pixel electrodes overlapping the first electrode, and second pixel electrodes overlapping the second electrode, first wiring lines connected to the first electrode, second wiring lines connected to the second electrode, and a control unit electrically connected to the first wiring lines and the second wiring lines. The display portion has a first end portion farthest from the control unit and a second end portion nearest to the control unit. The first electrode is adjacent to the first end portion. The second electrode is adjacent to the second end portion. The number of first wiring lines is a same as the number of second wiring lines.