Display Panel Dual Capacitance Pressure Detection
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Solution Overview
Problem
Existing display panels with integrated touch technology face challenges in accurately detecting pressure due to small variations in the liquid crystal cell gap, leading to nonideal pressure-sensitive detection, especially under low pressure.
Innovation Solution
The display panel incorporates a first and second pressure-sensitive detection electrode between substrates and a third detection element, forming two capacitances that are connected in parallel, allowing for increased capacitance variation detection when pressed, thereby enhancing pressure-sensitive detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single capacitance detection method is used between the first and second pressure-sensitive detection electrodes, then the device complexity is low, but the measurement precision of pressure detection is insufficient due to small capacitance variation
Solution Approach 1:
The detection system is segmented into two independent capacitance detection paths: a first capacitance formed between the first and second pressure-sensitive detection electrodes, and a second capacitance formed between the first pressure-sensitive detection electrode and the common electrode. This segmentation allows each capacitance to contribute to the overall pressure detection signal, thereby improving measurement precision through combined signal variation while maintaining relatively simple device structure
Solution Approach 2:
The patent merges the detection signals from two capacitances (first capacitance and second capacitance) to form a composite pressure detection output. By combining the variation signals from both capacitances, the system achieves enhanced measurement precision as the combined signal variation is significantly larger than that of a single capacitance, effectively solving the problem of small signal variation in conventional single-capacitance designs
2Measurement precision
If the liquid crystal cell gap variation is used for pressure detection, then the manufacturing process is simple, but the detection sensitivity is low under low pressure conditions
Solution Approach 1:
The patent changes the detection parameter from relying solely on liquid crystal cell gap variation to detecting capacitance variation. By forming capacitances between pressure-sensitive detection electrodes and common electrodes, the system transforms the detection mechanism to one that measures electrical capacitance changes, which exhibit significantly larger variation even under low pressure conditions, thereby improving detection sensitivity without complicating the manufacturing process
3Reliability
If only the first capacitance between the first and second pressure-sensitive detection electrodes is used for detection, then the device structure is simple, but the total capacitance variation is insufficient to improve detection performance
Solution Approach 1:
The patent combines two capacitance detection paths: the first capacitance between the first and second pressure-sensitive detection electrodes, and the second capacitance between the first pressure-sensitive detection electrode and the common electrode. By merging these two capacitances in parallel configuration, the total capacitance variation becomes the sum of variations from both capacitances, significantly enhancing the detection signal and improving pressure-sensitive detection reliability
Solution Approach 2:
The patent introduces another dimension to the capacitance detection by adding the common electrode as a reference point. Instead of relying on a single capacitance measurement, the system measures capacitance from the first pressure-sensitive detection electrode to two different references (second pressure-sensitive detection electrode and common electrode), creating a two-dimensional detection space that enhances signal variation and improves detection reliability
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 increases the basic capacitance value and total capacitance variation by over 50% when pressed, effectively improving pressure-sensitive detection and enabling better detection of low-pressure semaphores, facilitating multi-point pressure touch.
Implementation Method 1
a first capacitance is formed between the second pressure-sensitive detection electrode and the first pressure-sensitive detection electrode
Implementation Method 2
a second capacitance is formed between the third pressure-sensitive detection element and the first pressure-sensitive detection electrode
Data Source
AI summary
A display panel is disclosed. The display panel can include: a first substrate; a second substrate, arranged opposite to the first substrate; a first pressure-sensitive detection electrode, arranged on the first substrate and positioned proximal to one side of the second substrate; a second pressure-sensitive detection electrode, arranged on the second substrate and positioned proximal to one side of the first substrate, and a third pressure-sensitive detection element, positioned at one side of the first substrate distant from the second substrate and arranged at intervals from the first substrate. A first capacitance is formed between the second pressure-sensitive detection electrode and the first pressure-sensitive detection electrode. A second capacitance is formed between the third pressure-sensitive detection element and the first pressure-sensitive detection electrode. When the display panel is pressed, a magnitude of pressure is determined by detecting a variation of the first capacitance and a variation of the second capacitance.