Touch Display Shield Pattern Reduces Crosstalk
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Solution Overview
Problem
Touch display devices experience crosstalk issues between data lines and touch lines due to capacitance formation, which degrades touch sensing performance.
Innovation Solution
A touch display device structure is implemented with a shield pattern disposed between data lines and touch lines, where a shield signal is applied through a shield line in non-overlapping areas, using a conductive shield line connected to a backlight shield pattern or independent shield lines to reduce capacitance and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data lines and touch lines are disposed overlapping on the display panel, then the aperture ratio is improved and display area is increased, but capacitance is formed between the lines causing crosstalk in touch sensing signals
Solution Approach 1:
A shield pattern is introduced as an intermediary element between the data lines and touch lines. The shield pattern is disposed to overlap the data lines while being positioned between them and the touch lines, acting as a mediator that blocks the capacitive coupling and prevents crosstalk from affecting the touch sensing signals
Solution Approach 2:
The shield pattern, which inherently creates additional capacitance structures, is strategically designed to convert the potential harmful effect of added capacitance into a beneficial shielding effect. By applying a shield signal to the shield pattern, the capacitance is directed to couple with the shield pattern rather than creating harmful crosstalk between data and touch lines
2Measurement precision
If a shield pattern is disposed between touch lines and data lines to reduce crosstalk, then touch sensing performance is improved, but device structure complexity increases
Solution Approach 1:
The shield pattern is merged with existing display panel structures such as being integrated into the color filter layer or combined with the backlight shield pattern. This merging approach allows the shield pattern to perform its crosstalk reduction function while utilizing already-present structural elements, thereby minimizing the increase in overall device complexity
Solution Approach 2:
The shield pattern is designed to serve multiple functions: it acts as a shield against crosstalk, can be integrated with the color filter structure, and may serve as part of the backlight shielding system. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity
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 reduces crosstalk between data lines and touch lines, enhancing touch sensing performance and maintaining display quality by minimizing parasitic capacitance.
Implementation Method 1
capacitance may be formed between display driving data lines and touch lines, thereby causing crosstalk in a touch sensing signal
Implementation Method 2
a shield pattern disposed between the touch lines and the data lines to overlap the plurality of data lines, wherein a shield signal is applied to the shield pattern through a shield line
Data Source
AI summary
The present disclosure relates to touch display device and display panel. Provided are a touch display device and a display panel able to improve touch sensing performance by reducing crosstalk occurring between data lines and touch lines. A shield pattern is disposed in an area in which the touch lines overlap the data lines. A shield signal is applied to the shield pattern through shield lines in an area in which the shield pattern does not overlap the touch lines or the data lines. Direct capacitance is not formed between the touch lines and the data lines.