Optical Touch Module Integrated Cover Lid Design
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Solution Overview
Problem
Conventional touch display devices with integrated optical touch modules suffer from visual effects issues due to level differences between the display surface and the device housing, leading to erroneous touch point detection when the device is bent.
Innovation Solution
An optical touch module is integrated with a cover lid, featuring a light guide element with a light guide portion and an outer frame portion that extends beyond the device housing, accommodating a light source and photo sensor, which improves visual effects and prevents erroneous operations by ensuring consistent light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical touch module is added to the device housing, then touch-sensing function is provided, but level difference between display surface and device housing surface increases
Solution Approach 1:
The optical touch module is merged with the cover lid to form an integrated structure. The light guide element is configured on the display module with its outer frame portion connected to the device housing, making the touch module and cover lid as one unified component, thereby eliminating the level difference issue while maintaining touch-sensing functionality
Solution Approach 2:
The cover lid is designed to serve multiple functions: it acts as both the protective cover and the housing for the optical touch module. The light guide element serves dual purposes as both a structural component connecting to the device housing and as the optical path guide for touch sensing, reducing the need for separate components
2Device complexity
If the back bezel is bent to accommodate optical components, then components can be integrated, but light transmission is blocked causing erroneous touch detection
Solution Approach 1:
The light guide element acts as an intermediary component that transmits light from the light source to the photo sensor without requiring the back bezel to be bent. It provides a dedicated optical path that maintains light transmission integrity while allowing the back bezel to maintain its structural form, thus preventing erroneous touch detection
Solution Approach 2:
Instead of bending the back bezel in the lateral dimension to accommodate components, the design uses the vertical dimension by configuring the light guide element to extend from the display module to the device housing. This dimensional approach allows component integration without compromising the optical path or touch detection accuracy
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 integration of the optical touch module with a cover lid enhances visual appeal and functionality by maintaining accurate touch sensing even when the device is bent, reducing errors and improving user experience.
Implementation Method 1
The light guide element has a top surface and includes a light guide portion located on the display region and an outer frame portion extending from an edge of the light guide portion
Implementation Method 2
The photo sensor receives the light from the light guide portion and is covered by the outer frame portion
Data Source
AI summary
A touch display device includes a device housing, a display module, and an optical touch module. The display module is located within the device housing and has a display region and a peripheral region surrounding the display region. The optical touch module is configured on the display module. Besides, the optical touch module includes a light guide element, a light source, and a photo sensor. The light guide element has a top surface and includes a light guide portion and an outer frame portion. The light guide portion is located on the display region. The outer frame portion extends from an edge of the light guide portion and is connected to the device housing. The light source supplies light to the light guide portion. The photo sensor receives the light from the light guide portion. The outer frame portion covers the light source and the photo sensor.