Photo-Sensor Touch Device Optical Lens Design
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Solution Overview
Problem
Photo-sensor type touch panels face issues with large size, high cost, slow bootup and reaction times, and high power consumption due to the use of MEMS mirrors and inefficient light diffusion in conventional light modules.
Innovation Solution
A light module with an optical lens that converts light into parallel and linear light without MEMS mirrors, using a light source with a parallelizing surface, a wave surface, and a second plane to emit linear invisible light, reducing size, weight, and power requirements while speeding up bootup and reaction times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MEMS mirrors are used to reflect laser rays in photo-sensor type touch panel, then the touch sensing function is achieved, but the device size becomes large
Solution Approach 1:
The patent removes the MEMS mirrors from the system and replaces them with a direct laser emission structure. The laser module directly emits laser beams through the display screen without requiring any moving mirror components, thereby achieving touch sensing while significantly reducing device size.
Solution Approach 2:
The patent replaces the mechanical MEMS mirror system with an optical-direct emission system. Instead of using mechanically moving mirrors to redirect laser beams, the system uses a fixed laser module with optimized optical paths to achieve the same touch sensing function without mechanical moving parts.
2Reliability
If MEMS mirrors are used in photo-sensor type touch panel, then laser ray reflection is achieved, but power consumption increases
Solution Approach 1:
The patent removes the MEMS mirrors that consume power for mechanical operation and replaces them with a static laser emission system. The laser module directly emits beams without requiring energy-consuming moving parts, thereby reducing power consumption while maintaining the laser ray reflection function through optical design.
Solution Approach 2:
The patent replaces the power-consuming mechanical MEMS mirror system with an optical-direct emission system. The fixed laser module with optimized optical paths achieves laser beam direction control without mechanical movement, eliminating the power consumption associated with actuating moving mirrors.
3Illumination intensity
If conventional light module with lenticular lens array is used, then light is converted to parallel light, but light diffusion is poor
Solution Approach 1:
The patent applies different optical characteristics to different regions of the light module. The laser emission structure uses specific optical paths and refractive elements in different zones to simultaneously achieve parallel light conversion in the vertical direction and proper light diffusion in the horizontal direction, optimizing both illumination quality and manufacturing feasibility.
Solution Approach 2:
The patent changes the optical parameters of the light module by using a laser source with specific wavelength and coherence properties, combined with optimized optical path design. This allows the system to achieve both parallel light conversion and improved light diffusion by controlling the optical parameters rather than relying solely on geometric lens arrangements.
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 results in a thinner, lighter, and more efficient photo-sensor type touch device with faster bootup and reaction times, and reduced power consumption, addressing the limitations of conventional systems.
Implementation Method 1
an optical lens (24) along an optical axis from a light side to an object side... converts light into parallel and linear light
Implementation Method 2
emit linear invisible light... The invisible light is substantially perpendicular to a normal of the displaying region
Implementation Method 3
The sensor senses a change of the invisible light on the displaying region when an object approaches the displaying region
Data Source
AI summary
A photo-sensor type touch device includes a screen, two light modules, a sensor, and a calculating unit. The screen has a displaying region to show images thereon. The light module emits linear invisible light to the displaying region. The invisible light is substantially perpendicular to a normal of the displaying region. The sensor senses a change of the invisible light on the displaying region when an object approaches the displaying region, and sends a signal out. The calculating unit is electrically connected to the sensor to receive the signal and calculate the signal to obtain a location of the object on the displaying region.