Integrated Force Sensing Circuit in Display Panel
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Solution Overview
Problem
Conventional touch display panels face challenges with increased thickness and weight due to the need for additional touch panels and suspension devices, which degrade optical transmittance and limit sensing accuracy to single-point touch functions.
Innovation Solution
A display panel design incorporating a first and second substrate with a display control circuit and a force sensing circuit, where the force sensing circuit is integrated between the substrates, utilizing multiple force sensing elements to sense external forces and generate touch signals without additional touch panels or suspension devices, allowing for multi-point touch functionality while maintaining thinness and optical transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transparent touch panel is disposed above the display panel, then the touch input function is achieved, but the overall thickness and visible weight increase, and light transmittance and luminance degrade
Solution Approach 1:
The patent merges the touch sensing function with the display panel structure by integrating force sensing elements directly into the display panel's substrate system. This eliminates the need for a separate transparent touch panel layer, thereby reducing overall weight and thickness while maintaining the touch input function.
Solution Approach 2:
The display panel structure is designed to serve multiple functions simultaneously: it displays images through the second substrate while also sensing external forces through integrated force sensing elements. This multi-functionality eliminates the need for additional dedicated touch sensing components, reducing weight and structural complexity.
2Ease of operation
If a transparent touch panel is disposed above the display panel, then the touch input function is achieved, but light transmittance and luminance of the image degrade
Solution Approach 1:
By combining the touch sensing functionality within the display panel's own substrate structure rather than adding a separate transparent touch panel, the patent eliminates the additional light-absorbing layer. This preserves the optical transmittance and luminance of the display while maintaining touch input capability.
3Ease of operation
If force sensors are disposed below the display panel and arranged at the four corners, then the single-point touch function is achieved, but the sensing accuracy is limited due to insufficient amount of sensors
Solution Approach 1:
The patent segments the force sensing function into multiple distributed force sensing elements arranged across the display panel surface rather than concentrating them at four corners. This segmentation allows for multi-point touch detection and improved sensing accuracy by providing multiple measurement points throughout the sensing area.
Solution Approach 2:
The patent transitions from a corner-based force sensing arrangement to a distributed two-dimensional array of force sensing elements across the display panel. This dimensional expansion from four corner points to multiple distributed points enables multi-point touch functionality and significantly improves sensing accuracy.
4Device complexity
If the display panel is suspended by a thread or clamped by a clamp to form space for force sensors, then the force sensors can be accommodated, but the thickness of the touch display panel increases
Solution Approach 1:
The patent merges the force sensor accommodation within the existing display panel substrate structure rather than creating separate spaces through suspension or clamping. This integration eliminates the need for additional thickness to accommodate force sensors, maintaining a thin overall profile while providing sufficient space for sensor integration.
Data Source
AI summary
A display panel is provided. The display panel comprises a first substrate, a second substrate, a display control circuit and a force sensing circuit. The display control circuit is disposed on the first substrate between the first substrate and the second substrate for controlling the display panel to display an image through the second substrate. The force sensing circuit is disposed side by side with the display control circuit on the first substrate between the first substrate and second substrate, wherein the force sensing circuit comprises a plurality of force sensing elements for sensing at least one external force and correspondingly generate a plurality of force signals respectively to transform at least one touch signal corresponding to the at least one external force.