Curved glass detection based on spectral confocal technology
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Curved glass detection based on spectral confocal technology

Posted Date: 2024-01-30

Since Martin Cooper invented the world's first commercial mobile phone in April 1973 (the price at the time was US$3,995), after 50 years of development and changes, mobile phone screen specifications have been upgraded and iterated in line with the level of technological development: monochrome LCD screen (1983) - Monochrome touch screen (1994) - Four color screen (1997) - Full color screen (2001) - Multi-touch air capacitive screen (2007) - AMOLED screen (2008) - Full screen (2014) - Curved screen (2015) )-Special-shaped screen (2017)-Folding screen (2019).

According to the latest news, the Huawei P70 series will be released around March. The new product will use a 1.5K deep micro-curved screen and a conventional size narrow screen of about 6.7 inches. Although the physical picture of the product has not yet been exposed, we can see that mobile phone manufacturers are conducting innovative research and development on mobile phone curved screens with consumer experience as the priority.

As the most frequently used tool by humans, smartphones have become indispensable mobile terminal devices for consumers in daily life and work; as an important part of mobile phones, mobile phone covers directly affect the overall quality of the device and consumer experience. .

Mobile phone covers are usually made ofcover glassIt consists of four parts, adhesive layer, Sensor Glass and LCD panel; with the continuous updating of mobile phone products, mobile phone screens have gradually developed from the original 2D screen to 2.5D screen and 3D screen.

Cover glass needs to go through a series of processing and manufacturing processes from raw glass to finished product, such as cutting, CNC, polishing, ultrasonic cleaning, vacuum forging, tempering, silk screen, etc. Problems in any processing link will lead to substandard screen quality, such as more common If the flatness of the glass is not up to standard, it will usually lead to problems such as offset of the touch feedback area and uneven unevenness of the touch area.

Part One丨Application test

Taking cover glass as an example, the measured area can be divided into a flat part, a curved edge part and an R-angle part; due to the shape of the sample (curved surface) and the particularity of the material (transparent), it has certain effects on the optical stability and depth of field of the visual system. Higher requirements.

01. Detect the physical object

The samples tested this time are shown in the picture below.

02.Testing requirements

Product name: Curved glass

Measurement items: Appearance inspection

Measurement requirements: flatness, height, curvature, thickness, plane width

03.Detection process

Using point spectrum confocal displacement sensorHPS-CFL094Scan the sample.

The point spectral confocal displacement sensor HPS-CFL094 is a spectral confocal sensor based on the principle of the spectral confocal method and has an ultra-large measurement angle (±62°). It uses a non-contact measurement method to obtain distance value data on the object surface, which can provide stable measurement. Metal/ceramic/mirror/glass and other transparent, mirror, and highly reflective materials can be used to detect and analyze the surface profile and defects of the measured object.

04.Test results

Using the Hyperson Point Spectrum Confocal Displacement Sensor HPS-CFL094 to precisely measure samples, the following information can be obtained:

Part Two丨product description

01. Product advantages

Hyperson HPS-CF series is a high-end optical precision detection sensor based on the principle of spectral confocal method. It uses non-contact measurement method to obtain the distance value data of the object surface to realize the detection and analysis of the surface profile and defects of the measured object. It effectively solves the industry's problems in high-precision appearance inspection of materials such as transparent bodies, highly reflective mirrors, turbid glue, and black rubber.

02.Industry application

Suitable for online detection applications in 3C electronics, semiconductors, automotive electronics, medical and scientific research and other fields.

In addition to the point spectrum HPS-CF series products, the above-mentioned samples can also be detected by using the Hyperson 3D line spectrum confocal sensor HPS-LC series products. By turning point measurement into line measurement, the detection efficiency can be improved.


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