TWI644263B - Optical fingerprint identification system - Google Patents
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Abstract
一種光學指紋辨識系統，乃藉由一導光面板表面作為供手指按壓的指紋感測區域，同時提供準直的光學訊號，並將此光學訊號導入導光面板中以通過內全反射效應來傳輸，利用手指按壓會造成光學訊號於導光面板中內全反射的破壞，感光元件可偵測出光學訊號的波形變化且處理為指紋影像；藉此，當本發明將光學指紋辨識系統整合於顯示面板中，可將感光元件隱蔽於顯示面板的背面，其無須接收指紋的反射光線，沒有穿透度的問題，且指紋感測區域可實施於導光面板的全部或局部區域，不僅可供更為彈性地使用，也滿足消費者對於產品外觀的美感需求。An optical fingerprint identification system uses a light guide panel surface as a fingerprint sensing area for finger pressing, and simultaneously provides a collimated optical signal, and introduces the optical signal into the light guide panel to transmit by the total total reflection effect. The finger pressing causes damage of the total reflection of the optical signal in the light guide panel, and the photosensitive element can detect the waveform change of the optical signal and process it as a fingerprint image; thereby, the invention integrates the optical fingerprint identification system into the display In the panel, the photosensitive element can be concealed on the back side of the display panel, which does not need to receive the reflected light of the fingerprint, has no problem of penetration, and the fingerprint sensing area can be implemented in all or part of the light guiding panel, which is not only available for more For elastic use, it also meets the consumer's aesthetic needs for the appearance of the product.
Description
本發明係有關一種指紋辨識技術，特別是指一種利用光的內全反射效應進行感測辨識的光學指紋辨識系統。 The invention relates to a fingerprint identification technology, in particular to an optical fingerprint identification system that utilizes the total total reflection effect of light for sensing and identification.
指紋辨識為生物特徵識別技術的一種，其利用人體手指上獨有的指紋訊息進行辨識，以其在安全性和方便性方面的優點受到廣泛的應用；舉例來說，現今的智慧型手機幾乎都添加了指紋辨識功能，可以提供指紋加密、指紋解鎖。 Fingerprint recognition is a kind of biometric recognition technology, which uses the unique fingerprint information on the human finger to identify it, and its advantages in terms of safety and convenience are widely used; for example, today's smart phones are almost all Added fingerprint recognition function to provide fingerprint encryption and fingerprint unlocking.
一種光學指紋辨識系統10，請參照第1圖，由上而下依序設置一壓板12、一光擴散板13與一感光元件11，感光元件11周圍設置有多個光源14。其中，壓板12具有可供手指按壓的一板面121。光擴散板13將光源14所發出的入射光導向壓板12，並具有供反射光通過的一透孔131。當入射光由光擴散板13投射至手指A後，會通過透孔131反射至下方的感光元件11。由於指紋的波峰會反射光線，波谷會吸收光線，因此，反射光會形成明暗對比條紋，讓感光元件11來達到指紋辨識的效果。 An optical fingerprint identification system 10, please refer to FIG. 1, a pressure plate 12, a light diffusion plate 13 and a photosensitive element 11 are sequentially disposed from top to bottom, and a plurality of light sources 14 are disposed around the photosensitive element 11. The platen 12 has a plate surface 121 that can be pressed by a finger. The light diffusing plate 13 guides the incident light emitted from the light source 14 to the pressing plate 12, and has a through hole 131 through which the reflected light passes. When the incident light is projected by the light diffusing plate 13 to the finger A, it is reflected by the through hole 131 to the photosensitive element 11 below. Since the peak of the fingerprint reflects the light, the trough absorbs the light. Therefore, the reflected light forms a contrast stripe, allowing the photosensitive element 11 to achieve fingerprint recognition.
目前而言，將指紋辨識功能和顯示面板的顯示功能結合起來，是產業界正積極研究的一項熱門課題。將指紋辨識系統整合或是結合到顯示面板中的作法中，若是將指紋辨識的相關元件設置於顯示面板上方，由於以矽晶圓為基礎的感光元件是不透明的，會顯露於顯示面板之外，而置放於顯示面板下方又有穿透度的問題，可能無法良好地接收指紋的反射光線，而影響指紋辨識的精確度。因此，要將指紋辨識系統結合到顯示面板存有一定的限制，也很難不干擾到 產品的外觀設計。 At present, combining the fingerprint recognition function with the display function of the display panel is a hot topic that the industry is actively studying. In the method of integrating or combining the fingerprint identification system into the display panel, if the relevant component of the fingerprint recognition is disposed above the display panel, since the photosensitive element based on the germanium wafer is opaque, it will be exposed outside the display panel. However, the problem of transparency is placed under the display panel, and the reflected light of the fingerprint may not be well received, which affects the accuracy of fingerprint recognition. Therefore, there are certain restrictions on the integration of the fingerprint identification system into the display panel, and it is difficult to not interfere with The design of the product.
因此，便有需要研發一種光學指紋辨識系統，能夠良好的結合於顯示面板中，使其感光元件不會外露，來滿足產品的外觀需求，不但有別於先前技術的結構，更能有效克服其各種缺失；其具體架構及實施方式將詳述於下。 Therefore, there is a need to develop an optical fingerprint identification system that can be well integrated into the display panel so that the photosensitive elements are not exposed to meet the appearance requirements of the product, which is not only different from the prior art structure, but also effectively overcomes the problem. Various missing; its specific structure and implementation will be detailed below.
鑒於上述問題，本發明的主要目的在於提供一種光學指紋辨識系統，讓光學訊號得以通過內全反射效應於導光面板中傳輸，從而可藉由手指按壓造成光學訊號於導光面板中內全反射的破壞，以達到指紋辨識之作用。 In view of the above problems, the main object of the present invention is to provide an optical fingerprint identification system for allowing optical signals to be transmitted through a light-conducting panel through internal total reflection effects, thereby causing total reflection of optical signals in the light guide panel by finger pressing. Destruction to achieve the role of fingerprint recognition.
本發明的另一目的在於提供一種光學指紋辨識系統，可將感光元件隱蔽於顯示面板的背面，無須顯露在外，同時，指紋感測區域可設置於導光面板的全部或局部區域，更好的滿足了消費者對於產品外觀與使用彈性的各種需求。 Another object of the present invention is to provide an optical fingerprint identification system, which can conceal the photosensitive element on the back side of the display panel without being exposed, and at the same time, the fingerprint sensing area can be disposed in all or part of the light guiding panel, which is better. It meets the various needs of consumers for the appearance and flexibility of the product.
因此，為實現上述目的，本發明提供一種光學指紋辨識系統，主要包括一導光面板、一光源、一訊號放大器及一感光元件。其中，所述導光面板表面具有供手指按壓的一指紋感測區域，且所述導光面板是於一入光端與一出光端分別設有一第一導光部與一第二導光部。所述光源鄰近於第一導光部，並提供至少一準直的光學訊號，所述光學訊號經由第一導光部導入導光面板並在導光面板中通過內全反射效應傳輸，再經由第二導光部導出。所述訊號放大器鄰近於第二導光部，其接收第二導光部所導出的光學訊號，並將光學訊號放大後導出。而所述感光元件鄰近於訊號放大器，其接收訊號放大器所導出的光學訊號，並將光學訊號處理為一指紋影像，從而達成指紋辨識之目的。 Therefore, in order to achieve the above object, the present invention provides an optical fingerprint identification system, which mainly includes a light guide panel, a light source, a signal amplifier and a photosensitive element. The surface of the light guide panel has a fingerprint sensing area for pressing by a finger, and the light guiding panel is provided with a first light guiding portion and a second light guiding portion respectively at an light incident end and a light exit end. . The light source is adjacent to the first light guiding portion and provides at least one collimated optical signal. The optical signal is introduced into the light guiding panel via the first light guiding portion and transmitted by the total total reflection effect in the light guiding panel, and then The second light guiding unit is derived. The signal amplifier is adjacent to the second light guiding portion, and receives the optical signal derived by the second light guiding portion, and the optical signal is amplified and then derived. The photosensitive element is adjacent to the signal amplifier, and receives the optical signal derived by the signal amplifier, and processes the optical signal into a fingerprint image, thereby achieving fingerprint identification.
根據本發明之實施例，其中所述指紋感測區域可為所述導光面板表面的全部或局部區域。 According to an embodiment of the invention, wherein the fingerprint sensing area may be all or a partial area of the surface of the light guiding panel.
根據本發明之實施例，其中所述導光面板設置於一顯示面板上 方。 According to an embodiment of the invention, the light guide panel is disposed on a display panel square.
根據本發明之實施例，其中所述導光面板是採用塗佈光學膠或點膠方式貼合於所述顯示面板上。 According to an embodiment of the invention, the light guide panel is attached to the display panel by coating optical glue or dispensing.
根據本發明之實施例，其中所述光源可為準直光源或非準直光源與二次光學元件的組合。 According to an embodiment of the invention, the light source may be a combination of a collimated source or a non-collimated source and a secondary optical element.
根據本發明之實施例，其中所述準直光源可為雷射(Laser)或垂直共振腔面射雷射(VCSEL)。 According to an embodiment of the invention, wherein the collimated light source may be a laser or a vertical cavity laser (VCSEL).
根據本發明之實施例，其中所述二次光學元件可選自拋物面(Parabolic surface)聚光鏡、複合抛物面聚光鏡(CPC)、透鏡、稜鏡、菲涅爾透鏡(Fresnel lens)及其組合。 According to an embodiment of the invention, wherein the secondary optical element may be selected from the group consisting of a parabolic surface concentrating mirror, a compound parabolic concentrating mirror (CPC), a lens, a krypton, a Fresnel lens, and combinations thereof.
根據本發明之實施例，其中所述光學訊號之波長是介於380~1400奈米(nm)。 According to an embodiment of the invention, the wavelength of the optical signal is between 380 and 1400 nanometers (nm).
根據本發明之實施例，其中當所述光學訊號於所述導光面板內行進時，所述光學訊號與所述導光面板之表面或底面的法線之間的夾角需滿足大於arcsin(n0/n2)與arcsin(n1/n2)；其中，n0為導光面板之表面的折射率；n1為導光面板之底面的折射率；及n2為導光面板的折射率。 According to an embodiment of the present invention, when the optical signal travels in the light guide panel, an angle between the optical signal and a normal of a surface or a bottom surface of the light guide panel needs to be greater than arcsin (n 0 / n 2 ) and arcsin (n 1 / n 2 ); wherein n 0 is the refractive index of the surface of the light guide panel; n 1 is the refractive index of the bottom surface of the light guide panel; and n 2 is the refractive index of the light guide panel rate.
根據本發明之實施例，其中所述第一導光部、所述第二導光部與所述導光面板可為一體化結構。 According to an embodiment of the invention, the first light guiding portion, the second light guiding portion and the light guiding panel may be an integrated structure.
根據本發明之實施例，其中所述第一導光部與所述第二導光部相對於所述導光面板可為分開設置。 According to an embodiment of the invention, the first light guiding portion and the second light guiding portion may be separately disposed with respect to the light guiding panel.
根據本發明之實施例，其中所述導光面板的表面形成一鍍膜，所述鍍膜可供一可見光穿透，其餘波段的光為反射。 According to an embodiment of the invention, the surface of the light guiding panel is formed with a coating film, the coating film can be penetrated by a visible light, and the light of the remaining wavelength band is reflected.
根據本發明之實施例，其中所述第一導光部和所述第二導光部可為鏡面或光纖之形式。 According to an embodiment of the invention, the first light guiding portion and the second light guiding portion may be in the form of a mirror or an optical fiber.
根據本發明之實施例，其中所述訊號放大器可為鏡面之形式。 According to an embodiment of the invention, the signal amplifier may be in the form of a mirror.
根據本發明之實施例，其中所述感光元件與所述訊號放大器之間更包含一透鏡、一稜鏡薄膜(Prism film)、一角度濾波器(Angularfilter)、一偏振分光棱鏡(PBS)、分光鏡(BS)或其組合。 According to an embodiment of the invention, the lens and the signal amplifier further comprise a lens, a prism film, an angular filter (Angular filter), a polarization beam splitting prism (PBS), and a beam splitting. Mirror (BS) or a combination thereof.
根據本發明之實施例，其中所述角度濾波器可為垂直型或傾斜型的光柵濾波器。 According to an embodiment of the invention, the angle filter may be a vertical or tilt type grating filter.
根據本發明之實施例，其中所述光柵濾波器是由複數第一材料薄膜間隔設置所構成之單層結構。 According to an embodiment of the invention, the grating filter is a single layer structure formed by a plurality of first material film spacers.
根據本發明之實施例，其中所述光柵濾波器是由複數第一材料薄膜與複數第二材料薄膜間隔設置所構成之單層結構。 According to an embodiment of the invention, the grating filter is a single layer structure composed of a plurality of first material films and a plurality of second material films spaced apart from each other.
根據本發明之實施例，其中所述光柵濾波器是由複數第一材料薄膜與複數第二材料薄膜間隔設置所構成之多層結構，且所述多層結構中的不同層的所述第一材料薄膜為對齊排列或交錯排列。 According to an embodiment of the present invention, the grating filter is a multilayer structure composed of a plurality of first material films and a plurality of second material films, and the first material film of different layers in the multilayer structure Arranged or staggered.
根據本發明之實施例，其中所述感光元件相對於所述導光面板為平行或傾斜擺放。 According to an embodiment of the invention, the photosensitive elements are placed parallel or obliquely with respect to the light guiding panel.
根據本發明之實施例，其中所述第一導光部與所述光源之間、所述第二導光部與所述訊號放大器之間或前述兩處更包含至少一稜鏡(Prism)，且此稜鏡為固定式或可旋轉稜鏡。 According to an embodiment of the present invention, at least one Prism is further included between the first light guiding portion and the light source, between the second light guiding portion and the signal amplifier, or between the two places. And this is a fixed or rotatable 稜鏡.
根據本發明所提供的光學指紋辨識系統，可利用光學訊號於導光面板中的內全反射效應，並藉由偵測其光學訊號的波形變化，來獲取指紋影像，而當光學指紋辨識系統與顯示面板整合時，可將感光元件隱蔽於顯示面板的背面，也不會造成穿透度不足而影響辨識率的問題，從而可利於產品外觀的設計，同時，可設計區域性或全面性的指紋感測區域，可供使用者更為彈性且便利地使用指紋辨識功能。According to the optical fingerprint identification system provided by the present invention, the internal total reflection effect of the optical signal in the light guide panel can be utilized, and the fingerprint image is obtained by detecting the waveform change of the optical signal, and when the optical fingerprint identification system and the optical fingerprint identification system When the display panel is integrated, the photosensitive element can be concealed on the back side of the display panel, and the problem of insufficient visibility can be affected, which can affect the design of the product appearance, and at the same time, a regional or comprehensive fingerprint can be designed. The sensing area allows the user to use the fingerprint recognition function more flexibly and conveniently.
底下藉由具體實施例詳加說明，當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。底下藉由具體實施例配合所附的圖式詳加說明，當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。The purpose, technical content, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments. The purpose, technical contents, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments and the accompanying drawings.
請參照第2圖，繪示本發明之實施例所提供之光學指紋辨識系統20的剖面圖。此光學指紋辨識系統20主要是由導光面板21、準直光源22、訊號放大器23及感光元件24所構成。Referring to FIG. 2, a cross-sectional view of an optical fingerprint recognition system 20 provided by an embodiment of the present invention is shown. The optical fingerprint recognition system 20 is mainly composed of a light guide panel 21, a collimated light source 22, a signal amplifier 23, and a light receiving element 24.
本實施例中，導光面板21的表面具有可供手指A按壓的指紋感測區域211；實際應用上，指紋感測區域211可設計於導光面板21表面的全部區域或局部區域。本實施例中，導光面板21於兩側分別具有入光端212與出光端213，並於入光端212與出光端213分別設有第一導光部214與第二導光部215，具體而言，第一導光部214與第二導光部215可為反射板，用以調整光學訊號的傳遞角度；實際應用上，入光端212與出光端213的位置亦可設計在導光面板21的中間切口端。而導光面板21的材料可為玻璃，第一導光部214和第二導光部215可為鏡面或光纖之形式，且第一導光部214與第二導光部215相對於導光面板21可為分開設置，當然，第一導光部214與第二導光部215也可以和導光面板21設計成一體化結構。In this embodiment, the surface of the light guide panel 21 has a fingerprint sensing area 211 that can be pressed by the finger A. In practical applications, the fingerprint sensing area 211 can be designed on all or a partial area of the surface of the light guide panel 21. In this embodiment, the light guide panel 21 has an optical entrance end 212 and a light exit end 213 on both sides, and a first light guide portion 214 and a second light guide portion 215 are respectively disposed at the light entrance end 212 and the light exit end 213. Specifically, the first light guiding portion 214 and the second light guiding portion 215 can be reflectors for adjusting the transmission angle of the optical signal. In practical applications, the positions of the light incident end 212 and the light exit end 213 can also be designed. The intermediate slit end of the light panel 21. The material of the light guide panel 21 may be glass. The first light guiding portion 214 and the second light guiding portion 215 may be in the form of a mirror or an optical fiber, and the first light guiding portion 214 and the second light guiding portion 215 are opposite to the light guiding portion. The panel 21 may be separately provided. Of course, the first light guiding portion 214 and the second light guiding portion 215 may also be designed in an integrated structure with the light guiding panel 21 .
本實施例中，準直光源22鄰近於第一導光部214，用以提供準直的至少一光學訊號。進一步來說，準直光源22產生準直的光學訊號，並將光學訊號投向第一導光部214，第一導光部214會將光學訊號予以反射或傳遞，經由入光端212傳入導光面板21中，使光學訊號得以在導光面板21中通過內全反射（Total Internal Reflection, TIR）效應傳輸，然後傳往出光端213，再經由第二導光部215予以反射或傳遞出去。In this embodiment, the collimated light source 22 is adjacent to the first light guiding portion 214 for providing at least one optical signal for collimation. Further, the collimated light source 22 generates a collimated optical signal, and directs the optical signal to the first light guiding portion 214. The first light guiding portion 214 reflects or transmits the optical signal, and is guided through the light incident end 212. In the light panel 21, the optical signal is transmitted in the light guide panel 21 by the Total Internal Reflection (TIR) effect, and then transmitted to the light exit end 213, and then reflected or transmitted through the second light guide portion 215.
更進一步來說，為允許光學訊號在導光面板21中被內全反射，光學訊號與導光面板21之表面或底面的法線之間的夾角（此處為了下述描述方便，簡稱為入射角度θ），其最小角度分別為 arcsin（n 0/n 2）與 arcsin（n 1/n 2）方可達成內全反射。故，當光學訊號在導光面板21內行進時，其入射角度θ需同時大於上述兩項內全反射所需之最小角度，也就是入射角度θ需滿足大於arcsin（n 0/n 2）與arcsin(n1/n2)；其中，n0為導光面板21之表面的折射率；n1為導光面板21之底面的折射率；及n2為導光面板21的折射率。 Furthermore, in order to allow the optical signal to be totally internally reflected in the light guiding panel 21, the angle between the optical signal and the normal of the surface or the bottom surface of the light guiding panel 21 (herein referred to as the following description, referred to as incident) Angle θ), whose minimum angle is arcsin(n 0 /n 2 ) and arcsin(n 1 /n 2 ) respectively, can achieve total internal reflection. Therefore, when the optical signal travels in the light guide panel 21, the incident angle θ needs to be greater than the minimum angle required for the total internal reflection of the two, that is, the incident angle θ needs to satisfy greater than arcsin(n 0 /n 2 ) and Arcsin(n 1 /n 2 ); wherein n 0 is a refractive index of a surface of the light guiding panel 21; n 1 is a refractive index of a bottom surface of the light guiding panel 21; and n 2 is a refractive index of the light guiding panel 21.
本實施例中，導光面板21的折射率為1.5，當導光面板21的表面與底面皆與空氣相鄰時，光學訊號於導光面板21中的行進方向與其表面或底面的夾角，即入射角度θ為大於43度；當導光面板21的表面與底面僅有其中之一相鄰於空氣，另一面相鄰折射率為1.4的材料時，光學訊號於導光面板21中的行進方向與其表面或底面的夾角，即入射角度θ為大於70度。 In this embodiment, the refractive index of the light guide panel 21 is 1.5. When the surface and the bottom surface of the light guide panel 21 are both adjacent to the air, the angle between the traveling direction of the optical signal in the light guide panel 21 and the surface or the bottom surface thereof is The incident angle θ is greater than 43 degrees; when only one of the surface and the bottom surface of the light guide panel 21 is adjacent to the air and the other surface is adjacent to the material having a refractive index of 1.4, the traveling direction of the optical signal in the light guide panel 21 The angle with the surface or the bottom surface, that is, the incident angle θ is greater than 70 degrees.
本實施例中，準直光源22可為雷射(Laser)、垂直共振腔面射雷射(VCSEL)，或使用非準直光源與二次光學元件的組合來取代；具體而言，其中的二次光學元件可選自拋物面(Parabolic surface)聚光鏡、複合抛物面聚光鏡(CPC)、透鏡、稜鏡、菲涅爾透鏡(Fresnel lens)及其組合。如第3A圖所示，其繪示本發明實施例使用拋物面聚光鏡或CPC 221與非準直光源222搭配來提供準直的光學訊號；如第3B圖所示，其繪示本發明實施例使用菲涅爾透鏡223與非準直光源222搭配來提供準直的光學訊號；如第3C圖所示，其繪示本發明實施例使用一個(或多個)的透鏡224與非準直光源222搭配來提供準直的光學訊號。另如第3D圖所示，其繪示本發明實施例使用一個(或多個)稜鏡(Prism)225與非準直光源222搭配來提供準直的光學訊號通過稜鏡225；本發明中，稜鏡225可僅設置於第一導光部214與準直光源22或非準直光源222之間，或是設置於第二導光部215與訊號放大器23之間，甚至也可以在此兩處皆予以設置，且稜鏡225可為固定式或可旋轉稜鏡。 In this embodiment, the collimated light source 22 may be a laser, a vertical cavity laser (VCSEL), or a combination of a non-collimated light source and a secondary optical element; specifically, The secondary optical element can be selected from the group consisting of a parabolic surface concentrating mirror, a compound parabolic concentrating mirror (CPC), a lens, a krypton, a Fresnel lens, and combinations thereof. As shown in FIG. 3A, the embodiment of the present invention uses a parabolic concentrator or CPC 221 to cooperate with the non-collimated light source 222 to provide a collimated optical signal; as shown in FIG. 3B, the embodiment of the present invention is used. The Fresnel lens 223 is coupled with the non-collimated light source 222 to provide a collimated optical signal; as shown in FIG. 3C, which illustrates the use of one (or more) lens 224 and non-collimated light source 222 in accordance with an embodiment of the present invention. Paired to provide a collimated optical signal. As shown in FIG. 3D, the embodiment of the present invention uses one (or more) Prism 225 to cooperate with the non-collimated light source 222 to provide collimated optical signals through the 稜鏡225; The 稜鏡225 can be disposed only between the first light guiding portion 214 and the collimated light source 22 or the non-collimated light source 222, or between the second light guiding portion 215 and the signal amplifier 23, or even Both are provided, and the 稜鏡225 can be fixed or rotatable.
再者，光學訊號之波長可介於380~1400奈米(nm)；實際應用上，可區分為可見光段(380~780nm)與近紅外段(780~1400nm)。進一步 地說明，當使用可見光段的波長，其為肉眼可見，可使用不同波長來標示為有效或無效區域，協助使用者了解可用區域；當使用近紅外段的波長，其為肉眼不可見，適合使用在顯示面板下方(under display)或是需求不被使用者所察覺的環境下。另外，可藉由形成一鍍膜(圖中未示)於導光面板21的表面，以供可見光穿透，其餘波段的光則於導光面板21中反射。 Furthermore, the wavelength of the optical signal can be between 380 and 1400 nanometers (nm); in practical applications, it can be divided into a visible light segment (380-780 nm) and a near-infrared segment (780-1400 nm). further It is stated that when the wavelength of the visible light segment is used, it is visible to the naked eye, and different wavelengths can be used to indicate the effective or ineffective region to assist the user to understand the available region; when the wavelength of the near-infrared segment is used, it is invisible to the naked eye, and is suitable for use. Underneath the display panel or in an environment where the demand is not perceived by the user. In addition, a coating film (not shown) is formed on the surface of the light guiding panel 21 for visible light to pass through, and the remaining wavelengths of light are reflected in the light guiding panel 21.
本實施例中，訊號放大器23鄰近於第二導光部215，用以接收第二導光部215所導出的光學訊號，並將光學訊號放大後導出；訊號放大器23可為鏡面之形式。 In this embodiment, the signal amplifier 23 is adjacent to the second light guiding portion 215 for receiving the optical signal derived by the second light guiding portion 215 and amplifying the optical signal, and the signal amplifier 23 can be in the form of a mirror.
本實施例中，感光元件24鄰近於訊號放大器23，用以接收訊號放大器23所導出的光學訊號，並將光學訊號處理為一指紋影像，從而達成指紋辨識之目的。當使用者以手指A按壓導光面板21表面的指紋感測區域211，會造成光學訊號於導光面板21中內全反射的破壞，感光元件24可偵測出光學訊號的波形變化，並予以處理為一指紋影像，達到指紋辨識的目的。 In this embodiment, the photosensitive element 24 is adjacent to the signal amplifier 23 for receiving the optical signal derived by the signal amplifier 23 and processing the optical signal into a fingerprint image, thereby achieving fingerprint identification. When the user presses the fingerprint sensing area 211 on the surface of the light guiding panel 21 with the finger A, the optical signal is destroyed by the total reflection in the light guiding panel 21, and the photosensitive element 24 can detect the waveform change of the optical signal, and Processed as a fingerprint image to achieve the purpose of fingerprint recognition.
本實施例中，感光元件24與訊號放大器23之間更可包含一透鏡、一稜鏡薄膜(Prism film)、一角度濾波器(Angular filter)或其組合。請參照第4A圖~第4D圖，其分別繪示本發明實施例中使用透鏡251、稜鏡薄膜252、角度濾波器253及稜鏡薄膜252與角度濾波器253之組合於感光元件24上。 In this embodiment, the photosensitive element 24 and the signal amplifier 23 may further comprise a lens, a prism film, an angular filter or a combination thereof. Referring to FIG. 4A to FIG. 4D, the lens 251, the ruthenium film 252, the angle filter 253, and the iridium film 252 and the angle filter 253 are respectively combined on the photosensitive element 24 in the embodiment of the present invention.
其中，如第4C圖所示的角度濾波器253為垂直型的光柵濾波器，如第5A圖所示，角度濾波器253也可為傾斜型的光柵濾波器，且如第4C圖和第5A所示，角度濾波器253是由複數第一材料薄膜254間隔設置所構成之單層結構，或者，角度濾波器253也可由複數第一材料薄膜254與複數第二材料薄膜255間隔設置所構成之單層結構。另外，如第5B圖所示，角度濾波器253可為由複數第一材料薄膜254與複數第二材料薄膜255間隔設置所構成之多層結構，且多層結構中的不同層的第一材料薄膜254是對齊排列，或者，如第5C圖所示，多層結構中的不同層的第一材料薄膜254是交錯排列。此外，如第5D圖～第5F圖所示，則分別繪示對應第5A圖～第5C圖中的角度濾波器253與稜鏡薄膜252之組合於感光元件24上的實施態樣。The angle filter 253 shown in FIG. 4C is a vertical type grating filter. As shown in FIG. 5A, the angle filter 253 may also be a tilt type grating filter, and as shown in FIG. 4C and FIG. 5A. As shown, the angle filter 253 is a single layer structure formed by a plurality of first material films 254 spaced apart, or the angle filter 253 may be formed by a plurality of first material films 254 and a plurality of second material films 255. Single layer structure. In addition, as shown in FIG. 5B, the angle filter 253 may be a multilayer structure in which a plurality of first material films 254 and a plurality of second material films 255 are spaced apart, and a first material film 254 of a different layer in the multilayer structure. It is aligned, or, as shown in Fig. 5C, the first material films 254 of the different layers in the multilayer structure are staggered. Further, as shown in FIGS. 5D to 5F, the embodiment in which the combination of the angle filter 253 and the ruthenium film 252 in the fifth to fifth embodiments is combined with the photosensitive element 24 is shown.
上述實施例是透過提供準直的光學訊號於導光面板21中進行內全反射，在實務應用上，亦可直接使用非準直光源222提供未經準直的光學訊號於導光面板21中，再於感光元件24一方搭配設置高階的角度濾波器253，同樣可達到指紋成像的目的。The above embodiment provides internal total reflection in the light guide panel 21 by providing a collimated optical signal. In practical applications, the uncollimated light source 222 can be directly used to provide an uncollimated optical signal in the light guide panel 21. The high-order angle filter 253 is further disposed on the photosensitive element 24 side, and the purpose of fingerprint imaging can also be achieved.
另外，如第6A圖所示，本發明實施例所提供的光學指紋辨識系統20中感光元件24相對於導光面板21可為平行擺放；如第6B圖所示，本發明實施例所提供的光學指紋辨識系統20中感光元件24相對於導光面板21亦可為傾斜擺放，其傾斜角度α可例如為10度、45度或90度。In addition, as shown in FIG. 6A, the photosensitive element 24 of the optical fingerprint recognition system 20 of the embodiment of the present invention can be placed in parallel with respect to the light guide panel 21; as shown in FIG. 6B, the embodiment of the present invention provides The photosensitive element 24 of the optical fingerprint recognition system 20 may also be inclined with respect to the light guide panel 21, and the inclination angle α may be, for example, 10 degrees, 45 degrees, or 90 degrees.
本發明應用於光學指紋辨識系統20與顯示面板整合的產品中，如第7圖所示，本實施例是將導光面板21設置於一顯示面板30上方，並將感光元件24隱蔽於顯示面板30的背面；在實務應用上，導光面板21可視設計需求採用塗佈光學膠216或點膠方式貼合於顯示面板30上，為了較容易達到全表面的指紋辨識，導光面板21較佳是採用整個底面塗佈光學膠的方式。由於本發明之感光元件24並非利用接收指紋的反射光線來偵測，並不會造成穿透度不夠的問題，使得應用更為廣泛。The present invention is applied to a product integrated with the optical fingerprint identification system 20 and the display panel. As shown in FIG. 7, in the embodiment, the light guide panel 21 is disposed above a display panel 30, and the photosensitive element 24 is concealed in the display panel. In the practical application, the light guide panel 21 is attached to the display panel 30 by the application of the optical adhesive 216 or the dispensing method according to the design requirements. In order to easily achieve full surface fingerprint recognition, the light guide panel 21 is preferably used. It is a method of coating the optical glue on the entire bottom surface. Since the photosensitive element 24 of the present invention is not detected by the reflected light of the received fingerprint, it does not cause a problem of insufficient penetration, which makes the application more extensive.
此外，本發明亦可將光學指紋辨識系統20與手機的相機鏡頭作結合，如第8圖所示，本實施例是於感光元件24與訊號放大器23之間設置有一偏振分光棱鏡（PBS）或分光鏡(BS)41，一方面可以將訊號放大器23所導出的光學訊號提供給感光元件24感測成像，另一方面也可以將鏡頭模組40所傳遞的光學訊號提供給感光元件24感測成像，也就是說，本發明可以和手機的相機鏡頭達到感光元件24共用，讓光學指紋辨識系統20不用佔據太大的結構空間，使最終產品的體積可以精簡化。In addition, the present invention can also combine the optical fingerprint recognition system 20 with the camera lens of the mobile phone. As shown in FIG. 8, in this embodiment, a polarization beam splitting prism (PBS) is disposed between the photosensitive element 24 and the signal amplifier 23. The spectroscope (BS) 41 can provide the optical signal derived from the signal amplifier 23 to the photosensitive element 24 for sensing imaging, and can also provide the optical signal transmitted by the lens module 40 to the photosensitive element 24 for sensing. Imaging, that is, the present invention can be shared with the camera lens of the mobile phone to reach the photosensitive element 24, so that the optical fingerprint recognition system 20 does not occupy too much structural space, so that the volume of the final product can be simplified.
上述實施例中，導光面板21與其第一導光部214及第二導光部215、準直光源22或非準直光源222、訊號放大器23和感光元件24的類型、形狀、數量、相對位置等關係僅為一示例，並不以此為限，任何與本案精神均等者皆不脫離本發明的範疇。In the above embodiment, the type, shape, number, and relative of the light guide panel 21 and its first light guiding portion 214 and second light guiding portion 215, the collimated light source 22 or the non-collimated light source 222, the signal amplifier 23, and the photosensitive element 24 are opposite. The positional relationship is only an example, and is not limited thereto, and any one of the spirits of the present invention does not depart from the scope of the present invention.
綜上所述，根據本發明所揭露的光學指紋辨識系統，乃藉由導光面板作為供手指按壓的指紋感測區域，同時提供準直的光學訊號，並設計有第一導光部和第二導光部，使光學訊號能夠於導光面板中進行內全反射效應之傳輸，再經由訊號放大，最後以感光元件偵測其波形變化，從而獲取指紋影像。相較於習知的光學指紋辨識系統，其感光元件是通過接收由手指反射的光線來進行偵測，感光元件上方存在有穿透度的問題，使得指紋辨識相關元件之配置有其侷限；而本發明所揭露的光學指紋辨識系統則相對容易配置，特別是用於光學指紋辨識系統與顯示面板整合時，可將感光元件隱蔽於顯示面板的背面，無須擔心穿透度不足而影響辨識率，將有利於產品的外觀設計，來滿足消費者對於產品外觀的美感需求。而本發明亦可將光學指紋辨識系統與鏡頭模組作整合，只要增設一偏振分光棱鏡（PBS）或分光鏡(BS)，即可共用感光元件，將產品結構予以精簡化。進一步地，還可設計區域性或全面性的指紋感測區域，可供使用者更為彈性且便利地使用指紋辨識功能。In summary, the optical fingerprint identification system disclosed in the present invention uses a light guide panel as a fingerprint sensing area for finger pressing, and provides a collimated optical signal, and is designed with a first light guiding portion and a first The two light guiding portions enable the optical signal to transmit the total total reflection effect in the light guiding panel, and then the signal is amplified, and finally the photosensitive element detects the waveform change thereof to obtain the fingerprint image. Compared with the conventional optical fingerprint identification system, the photosensitive element is detected by receiving the light reflected by the finger, and there is a problem of the transparency above the photosensitive element, so that the configuration of the fingerprint identification related component has its limitation; The optical fingerprint identification system disclosed by the invention is relatively easy to configure, in particular, when the optical fingerprint identification system is integrated with the display panel, the photosensitive element can be concealed on the back side of the display panel without affecting the lack of penetration and affecting the recognition rate. It will be beneficial to the design of the product to meet the consumer's aesthetic needs for the appearance of the product. The invention can also integrate the optical fingerprint identification system with the lens module. By adding a polarization splitting prism (PBS) or a beam splitter (BS), the photosensitive element can be shared, and the product structure can be simplified. Further, a regional or comprehensive fingerprint sensing area can be designed to allow the user to use the fingerprint recognition function more flexibly and conveniently.
唯以上所述者，僅為本發明之較佳實施例而已，並非用來限定本發明實施之範圍。故即凡依本發明申請範圍所述之特徵及精神所為之均等變化或修飾，均應包括於本發明之申請專利範圍內。The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, any changes or modifications of the features and spirits of the present invention should be included in the scope of the present invention.
10‧‧‧光學指紋辨識系統10‧‧‧Optical fingerprint identification system
11‧‧‧感光元件11‧‧‧Photosensitive element
12‧‧‧壓板12‧‧‧ pressure plate
121‧‧‧板面121‧‧‧ board
13‧‧‧光擴散板13‧‧‧Light diffuser
131‧‧‧透孔131‧‧‧through hole
14‧‧‧光源14‧‧‧Light source
20‧‧‧光學指紋辨識系統20‧‧‧Optical fingerprint identification system
21‧‧‧導光面板21‧‧‧Light guide panel
211‧‧‧指紋感測區域211‧‧‧Finger sensing area
212‧‧‧入光端212‧‧‧Into the light end
213‧‧‧出光端213‧‧‧Lighting end
214‧‧‧第一導光部214‧‧‧First Light Guide
215‧‧‧第二導光部215‧‧‧Second Light Guide
216‧‧‧光學膠216‧‧‧Optical adhesive
22‧‧‧準直光源22‧‧‧ Collimated light source
221‧‧‧拋物面聚光鏡或CPC221‧‧‧Parabolic Condenser or CPC
222‧‧‧非準直光源222‧‧‧ Non-collimated light source
223‧‧‧菲涅爾透鏡223‧‧ ‧Fresnel lens
224‧‧‧透鏡224‧‧‧ lens
225‧‧‧稜鏡225‧‧‧稜鏡
23‧‧‧訊號放大器23‧‧‧Signal Amplifier
24‧‧‧感光元件24‧‧‧Photosensitive elements
251‧‧‧透鏡251‧‧‧ lens
252‧‧‧稜鏡薄膜252‧‧‧稜鏡film
253‧‧‧角度濾波器253‧‧‧Angle filter
254‧‧‧第一材料薄膜254‧‧‧First material film
255‧‧‧第二材料薄膜255‧‧‧Second material film
30‧‧‧顯示面板30‧‧‧ display panel
40‧‧‧鏡頭模組40‧‧‧Lens module
41‧‧‧偏振分光棱鏡或分光鏡41‧‧‧Polarizing beam splitting prism or beam splitter
A‧‧‧手指A‧‧‧ finger
θ‧‧‧入射角度Θ‧‧‧incidence angle
α‧‧‧傾斜角度‧‧‧‧ tilt angle
第1圖為先前技術所提供的光學指紋辨識系統的剖面圖。 第2圖為本發明實施例所提供的光學指紋辨識系統的剖面圖。 第3A～3C圖為本發明實施例所提供的光學指紋辨識系統中使用不同二次光學元件與非準直光源組合的示意圖。 第3D圖為本發明實施例所提供的光學指紋辨識系統中使用稜鏡與非準直光源組合的示意圖。 第4A～4D圖分別為本發明實施例所提供的光學指紋辨識系統中使用透鏡、稜鏡薄膜、角度濾波器及稜鏡薄膜與角度濾波器之組合於感光元件的示意圖。 第5A～5C圖為本發明實施例所提供的光學指紋辨識系統中使用不同角度濾波器於感光元件的示意圖。 第5D圖～第5F圖為本發明實施例所提供的光學指紋辨識系統中使用不同角波器與稜鏡薄膜之組合於感光元件的示意圖。 第6A及6B圖分別為本發明實施例所提供的光學指紋辨識系統中使用不同擺放方式之感光元件的示意圖。 第7圖為本發明實施例所提供的光學指紋辨識系統與顯示面板作結合的示意圖。 第8圖為本發明實施例所提供的光學指紋辨識系統與手機的相機鏡頭作結合的示意圖。Figure 1 is a cross-sectional view of an optical fingerprinting system provided by the prior art. 2 is a cross-sectional view of an optical fingerprint recognition system according to an embodiment of the present invention. 3A-3C are schematic diagrams showing the use of different secondary optical elements and non-collimated light sources in an optical fingerprint identification system according to an embodiment of the present invention. FIG. 3D is a schematic diagram of a combination of a 稜鏡 and a non-collimated light source in an optical fingerprint recognition system according to an embodiment of the present invention. 4A to 4D are schematic diagrams showing the use of a lens, a ruthenium film, an angle filter, and a combination of a ruthenium film and an angle filter in a photosensitive fingerprint element in an optical fingerprint recognition system according to an embodiment of the present invention. 5A-5C are schematic diagrams showing the use of different angle filters in the photosensitive element in the optical fingerprint identification system provided by the embodiment of the present invention. FIG. 5D to FIG. 5F are schematic diagrams showing the use of different angular wave devices and tantalum films in a photosensitive element in an optical fingerprint identification system according to an embodiment of the present invention. 6A and 6B are schematic views respectively showing photosensitive elements using different placement methods in the optical fingerprint identification system provided by the embodiments of the present invention. FIG. 7 is a schematic diagram of an optical fingerprint identification system and a display panel according to an embodiment of the present invention. FIG. 8 is a schematic diagram of a combination of an optical fingerprint recognition system and a camera lens of a mobile phone according to an embodiment of the present invention.
Claims (20)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW106145847A TWI644263B (en) | 2017-12-27 | 2017-12-27 | Optical fingerprint identification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW106145847A TWI644263B (en) | 2017-12-27 | 2017-12-27 | Optical fingerprint identification system |
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| Publication Number | Publication Date |
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| TWI644263B true TWI644263B (en) | 2018-12-11 |
| TW201928765A TW201928765A (en) | 2019-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| TW106145847A TWI644263B (en) | 2017-12-27 | 2017-12-27 | Optical fingerprint identification system |
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| CN111382700A (en) * | 2020-03-09 | 2020-07-07 | 厦门天马微电子有限公司 | Display device |
| US10811545B2 (en) | 2019-02-14 | 2020-10-20 | Gingy Technology Inc. | Sensing module and image capturing apparatus |
| CN114527622A (en) * | 2020-11-23 | 2022-05-24 | 中强光电股份有限公司 | Light splitting element and projection device |
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| TW200612353A (en) * | 2004-10-15 | 2006-04-16 | Lite On Semiconductor Corp | Optical sensing module, optical sensing, image-capturing structure and optical print sensing method of handheld communication system |
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| TW201601037A (en) * | 2014-06-20 | 2016-01-01 | Vkansee Technology Company Ltd | Optical sensing key, touch screen, fingerprint collecting device and electronic device |
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| US10811545B2 (en) | 2019-02-14 | 2020-10-20 | Gingy Technology Inc. | Sensing module and image capturing apparatus |
| CN111382700A (en) * | 2020-03-09 | 2020-07-07 | 厦门天马微电子有限公司 | Display device |
| CN111382700B (en) * | 2020-03-09 | 2022-10-14 | 厦门天马微电子有限公司 | Display device |
| CN114527622A (en) * | 2020-11-23 | 2022-05-24 | 中强光电股份有限公司 | Light splitting element and projection device |
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| Publication number | Publication date |
|---|---|
| TW201928765A (en) | 2019-07-16 |
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