Display Device Spacer Configuration for Parasitic Capacitance Reduction
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Solution Overview
Problem
Display devices with small distances between touch electrodes and display elements often form unwanted parasitic capacitors, leading to errors in touch recognition.
Innovation Solution
The display device incorporates spacers between the display and touch substrates to maintain a distance between touch electrodes and display elements, minimizing parasitic capacitors by arranging conductive lines and spacers in a specific configuration to prevent overlap and ensure effective touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between touch electrode and display element is reduced to improve display resolution and touch sensitivity, then touch sensitivity is improved, but parasitic capacitance increases causing touch recognition errors
Solution Approach 1:
An insulating layer is introduced as an intermediary between the touch electrode and the display element (specifically between the touch electrode and the cathode electrode). This insulating layer acts as a mediator that electrically isolates the two conductive elements, preventing the formation of unwanted parasitic capacitance while allowing the physical distance to remain small for maintaining touch sensitivity and display resolution.
2Length of stationary object
If spacers are placed close to conductive lines to maintain distance between substrates, then distance maintenance is improved, but parasitic capacitance increases due to overlap
Solution Approach 1:
The insulating layer is selectively applied only in regions where conductive lines (first and second conductive lines) are present, particularly at their intersections. This localized insulation approach ensures that spacers can be positioned close to conductive lines for maintaining substrate distance without creating parasitic capacitance, as the insulation is provided precisely where the conductive elements are located.
Data Source
AI summary
A display device may include a display part, a substrate, a first spacer, a second spacer, a first touch electrode, and a second touch electrode. The display part may emit, transmit, and/or reflect light. The substrate may overlap the display part and may receive a touch. The first spacer and the second spacer may be formed of a spacer material and may be positioned between the display part and the substrate to maintain a distance between the display part and the substrate. No intervening spacer analogous to the first spacer or the second spacer may be positioned between the first spacer and the second spacer. The first touch electrode may be positioned between the first spacer and the second spacer in a plan view of the display device. The second touch electrode may intersect the first touch electrode in the plan view of the display device.