Touch Sensor Light Control for Display Accuracy
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Solution Overview
Problem
Liquid crystal display (LCD) devices with integrated touch screens face high manufacturing costs, reduced productivity, decreased luminance, and increased thickness due to the addition of touch screen panels, and existing photo sensor solutions can lead to errors in detecting touch events due to non-uniformity in the amorphous silicon layer.
Innovation Solution
A display device incorporating two touch sensors with a shade on one of them to control light intensity, along with a reader system to analyze signals from both sensors, which includes photo sensors and mechanical sensors to accurately distinguish between touch and non-touch events, thereby reducing errors and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch screen panel is attached to an LCD, then touch functionality is provided, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent merges the touch sensor functionality directly into the LCD substrate by integrating photo sensors and mechanical sensors within the liquid crystal display structure itself, eliminating the need for a separate touch screen panel attachment. This integration reduces manufacturing steps, lowers costs, and improves productivity while maintaining touch functionality.
Solution Approach 2:
The LCD substrate is designed to serve multiple functions: displaying images and detecting touch events. By incorporating both photo sensors (for touch detection) and mechanical sensors (for pressure detection) within the same substrate structure, the device achieves multi-functionality without requiring separate components.
2Adaptability or versatility
If a touch screen panel is attached to an LCD, then touch functionality is provided, but thickness increases
Solution Approach 1:
The touch sensor components (photo sensors and mechanical sensors) are nested within the existing LCD substrate structure, utilizing the same space and layers already present in the display device. This nesting approach eliminates the need for additional external layers, thereby maintaining thin profile while providing touch functionality.
3Adaptability or versatility
If photo sensors are used to detect touch events, then touch detection is enabled, but detection accuracy decreases due to amorphous silicon layer non-uniformity
Solution Approach 1:
The patent introduces mechanical sensors as an intermediary detection mechanism that works in conjunction with photo sensors. The mechanical sensors detect physical deformation of the liquid crystal layer caused by touch pressure, providing an additional detection channel that is not affected by photo sensor non-uniformity. This intermediary mechanism compensates for detection errors and improves overall accuracy.
Solution Approach 2:
The detection system uses a composite approach combining two different sensing mechanisms (photo sensors and mechanical sensors) with different operating principles. This composite sensing system leverages the strengths of each mechanism while compensating for their individual weaknesses, particularly the non-uniformity issue affecting photo sensors alone.
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
The solution effectively reduces manufacturing costs and thickness while enhancing the accuracy of touch event detection by using a dual-sensor system with controlled light intensity, minimizing false positives and improving overall display performance.
Implementation Method 1
A first touch sensor 10 and a second touch sensor 20 are provided, and a shade 204 is disposed on the second touch sensor 20
Implementation Method 2
a first touch sensor and the second touch sensor each include a photo sensor which senses incident light and a mechanical sensor which senses deformation of a liquid crystal layer, respectively
Implementation Method 3
a shade located on the second touch sensor wherein the shade controls intensity of incident light to the second touch sensor
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A runner assembly for use with a central shaft (100) of an umbrella frame includes a tubular retaining block (20) which is movable relative to a tubular runner (10) in a transverse direction (X) relative to an axis (L) of the central shaft (100), and a tubular thrust member (30) movable along the axis (L). An inner sleeve surface of the thrust member (30) is configured such that, when the thrust member (30) is pressed from a releasing position to an actuating position, the retaining block (20) is moved from a first position to a second position to permit a retaining member (26) disposed thereon to engage an engaging surface (110) of the central shaft (100) so as to keep the umbrella frame in an open state.