In-Cell Touch Display Noise Cancellation via Polarity Arrangement
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Solution Overview
Problem
In in-cell type touch-panel-integrated display devices, the presence of multiple electrodes and voltage lines near data lines leads to noise interference due to alternating-current voltages with different polarities, making noise correction challenging.
Innovation Solution
The device arranges electrodes with connected lines in a configuration where each data line has a voltage polarity different from its adjacent lines, allowing the lines to cancel out noise effects, and optionally connects each electrode to multiple lines arranged near data lines with varying polarities or the same polarity as adjacent lines, facilitating easier noise correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lines are provided in the vicinity of data lines for electrode connection, then electrode functionality is improved, but noise interference from data line voltages increases
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by utilizing the alternating polarity pattern of adjacent data lines to cancel out noise effects. Lines connected to electrodes are strategically arranged to overlap with data lines having opposite polarities, converting the harmful noise into a beneficial cancellation effect where positive and negative noise components neutralize each other, thereby reducing overall noise interference while maintaining electrode functionality.
Solution Approach 2:
The patent applies the 'Local quality' principle by making the noise cancellation effect local to each electrode region. Each electrode's connected lines are specifically arranged to overlap with data lines in its immediate vicinity, creating localized noise cancellation zones. This allows different regions of the display panel to have optimized line arrangements according to their local data line polarity patterns, effectively addressing noise at each specific electrode location.
2Adaptability or versatility
If lines are arranged near data lines with different polarities, then electrode connectivity is improved, but noise correction difficulty increases
Solution Approach 1:
The patent applies the 'Homogeneity' principle by ensuring that all lines connected to a single electrode exhibit the same noise polarity characteristics. Through careful arrangement, each electrode's connected lines are positioned to experience consistent noise conditions (either all experiencing net positive noise or all experiencing net negative noise). This homogenization of noise polarity across lines connected to the same electrode greatly simplifies noise correction, as uniform noise patterns are much easier to compensate for compared to mixed polarity patterns.
Data Source
AI summary
Provided is a touch-panel-integrated display device in which influences of noises due to voltages of data lines can be reduced, or noise correction can be easily performed. A touch-panel-integrated display device 1 includes a display panel that has a display area that includes a plurality of pixels defined by a plurality of gate lines 101 and a plurality of data lines 102. In the display area, a plurality of electrodes 111, and a plurality of lines 112 connected with the electrodes, are provided. A predetermined voltage is applied to each line 112 every fixed time period, and changes in the capacitance at each electrode 111 are detected. To each data line 102, a voltage having a polarity different from that for an adjacent one of the data lines 102 is applied. Each of the electrodes 111 is connected with at least one of the plurality of lines 112. The at least one of the lines 112 is arranged in the vicinity of a plurality of the data lines 102 to which voltages having different polarities are applied, or alternatively, arranged in the vicinity of one of the data lines 102 to which a voltage having the same polarity as that of a voltage applied to the data line 102 arranged in the vicinity of another line 112 is applied.