Light Uniformizing Film for Optical Sensor Receiving Angle
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Solution Overview
Problem
Current methods to increase the receiving angle of optical sensors in handheld terminals, such as printing light uniformizing ink or adding light guiding columns, reduce yield rates and increase assembly complexity and costs.
Innovation Solution
A structure and method involving a light uniformizing film with light uniformizing particles placed between the touchscreen glass and the optical sensor, which collects and directs external ambient light to the sensor, enhancing the sensor's light reception angle while maintaining simple assembly and low costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light uniformizing ink is printed on the glass ambient light hole, then the receiving angle of the optical sensor is increased, but the yield rate of the touchscreen is reduced
Solution Approach 1:
A light uniformizing film is introduced as an intermediary component between the touchscreen glass and the optical sensor. This film contains light uniformizing particles that diffuse and redirect ambient light, enabling the optical sensor to receive light from a wider angle range without requiring modifications to the touchscreen glass itself, thereby avoiding yield rate reduction.
Solution Approach 2:
The light uniformizing function is separated from the touchscreen glass structure and implemented as a distinct film layer. This segmentation allows the touchscreen glass to remain intact and manufacturable with standard processes, while the light uniformizing properties are provided by the separate film that can be easily applied or integrated.
2Adaptability or versatility
If a light guiding column is added between the glass ambient light hole and the optical sensor, then the receiving angle of the optical sensor is increased, but the assembling difficulty is increased
Solution Approach 1:
The light uniformizing film serves as a planar intermediary layer that replaces the need for three-dimensional light guiding columns. This film can be easily positioned and attached between the touchscreen glass and optical sensor, significantly simplifying the assembly process compared to installing precise mechanical light guiding structures.
3Adaptability or versatility
If light uniformizing ink is printed on the glass ambient light hole, then the receiving angle of the optical sensor is increased, but the cost is increased
Solution Approach 1:
The light uniformizing film provides a cost-effective solution by using a simple, easily manufacturable film structure with light uniformizing particles, replacing expensive glass modification processes or complex light guiding column assemblies. The film can be produced through standard coating or lamination techniques.
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 significantly increases the optical sensor's receiving angle, improving yield rates and reducing costs, allowing for more accurate brightness control of the LCD across various ambient light conditions.
Implementation Method 1
the light uniformizing film contains light uniformizing particles, and the light uniformizing particles are capable of receiving light incident from different directions
Implementation Method 2
external ambient light passes through touchscreen glass and is incident on a light uniformizing film, and the light uniformizing film collects the external ambient light and conducts the external ambient light to an optical sensor
Data Source
AI summary
A method and a structure are provided to increase a receiving angle of an optical sensor. The structure includes touchscreen glass, an optical sensor, and a main board. An ambient light hole is provided on the touchscreen glass. The optical sensor is disposed between the touchscreen glass and the main board. A light uniformizing film is disposed between the touchscreen glass and the optical sensor, is in contact with the touchscreen glass, and completely covers the ambient light hole. A handheld terminal includes the foregoing structure.