手機上隱藏式指紋辨識設計

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题名:	手機上隱藏式指紋辨識設計
作者:	林哲玄;Lin, Jhe-Syuan
贡献者:	光電科學與工程學系
关键词:	指紋辨識;光學設計;全內反射;準直器;Fingerprint Recognition;Optical Design;Total Internal Reflection;Collimator
日期:	2021-07-01
上传时间:	2021-12-07 11:41:01 (UTC+8)
出版者:	國立中央大學
摘要:	本論文針對現今主流的兩種面板手機提出隱藏於屏幕下的指紋辨識光學設計，一個為適用於Liquid Crystal Display (LCD)屏幕下的指紋辨識，另一個為適用於Organic Light-Emitting Diode (OLED)屏幕下的超薄型指紋辨識。LCD屏幕本身不具透明特性，要讓其實現屏幕下指紋辨識的難度較高，因此我們提出一個設計方法將屏幕表面的保護玻璃(Cover Glass)作為導光板，當指紋按壓在玻璃表面時，指紋的脊會破壞導光板的全反射特性紀錄下指紋的紋路。另外，我們在保護玻璃的出入瞳處設計一個反射斜面，此斜面具有斜向投影放大與縮小的功能，讓外觀設計可以達到窄邊框(Bezel Less)需求，使屏佔比可達98%。最後將設計實現在LCD屏幕手機上並取得高對比度的指紋影像。在OLED屏幕下超薄型指紋辨識設計部分，我們提出一個利用光阻堆疊的方式來製作準直器取代傳統Through Silicon Via (TSV)的方式可以降低製作成本。另外，模組整體厚度小於0.6 mm的設計使其可以被放到屏幕與手機中框之間，讓電池的體積不在受到指紋辨識模組影響。最後，我們將此模組實作並組裝到OLED屏幕與手機中框內，利用OLED屏幕發光取得良好對比度的指紋影像。;This thesis proposes two fingerprint recognition design which is hidden under the panel of mobile phone, one is suitable for Liquid Crystal Display (LCD) panel, and the other one is suitable for Organic Light-Emitting Diode (OLED) panel. LCD panel isn’t transparent, so it is difficult to realize fingerprint recognition under the panel. Therefore, we propose a design method to use the cover glass on the screen as the light guide plate. When the fingerprint is pressed on the glass surface, the ridge of fingerprint will Frustrated Total Internal Reflection (FTIR) and then record the fingerprint pattern. In addition, we designed a reflective surface at the entrance and exit pupil of cover glass. This reflective surface has the function of enlargement and reduction, so that the appearance can be bezel less. The screen ratio is achieved 98%. Finally, this design is implemented on LCD panel’s mobile phone to obtain a high-contrast fingerprint image. In the ultra-thin fingerprint recognition design under the OLED panel, we propose a design the uses photoresist stacking to make the collimator instead of the traditional Through Silicon Via (TSV) method, through this method can reduce the cost. Furthermore, the module thickness is less than 0.6 mm so that it can be place between the screen and the middle frame of the phone. This can provide an advantage that the size of battery is not affected by the fingerprint module. Finally, we implemented and assembled this module into the OLED panel and the middle frame of mobile phone, and used OLED panel to emit light to obtain fingerprint images with good contrast.
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