TWI448973B - A light guide module that improves image contrast - Google Patents
A light guide module that improves image contrast Download PDFInfo
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- TWI448973B TWI448973B TW098135937A TW98135937A TWI448973B TW I448973 B TWI448973 B TW I448973B TW 098135937 A TW098135937 A TW 098135937A TW 98135937 A TW98135937 A TW 98135937A TW I448973 B TWI448973 B TW I448973B
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Description
本發明是有關於一種影像辨識系統，特別是指一種光學影像辨識系統的導光模組。The invention relates to an image recognition system, in particular to a light guiding module of an optical image recognition system.
參閱圖1與圖2，美國專利案US6011860號專利權揭露一種用於指紋辨識的光學影像辨識系統1，包含一不透光殼體11、一光擴散板12及二安裝於該光擴散板12側面的光源13，使用者將手指按壓於該光擴散板12上，該光源13出射的光經由該光擴散板12照射於手指上，指紋紋路的波峰反射光線，波谷散射光線，故指紋紋路的波峰波谷將造成亮暗條紋影像，此影像再利用一取像裝置14進行取像與分析辨識。Referring to FIG. 1 and FIG. 2, an optical image recognition system 1 for fingerprint identification includes an opaque housing 11, a light diffusing plate 12, and two mounted on the light diffusing plate 12, as disclosed in US Pat. The light source 13 on the side, the user presses a finger on the light diffusing plate 12, and the light emitted from the light source 13 is irradiated onto the finger through the light diffusing plate 12, the peak of the fingerprint pattern reflects the light, and the trough scatters the light, so the fingerprint line is The peak wave trough will result in a bright and dark stripe image, which is then imaged and analyzed using an image capture device 14.
但此種光學影像辨識系統1的取像裝置14將會擷取到自該光源13直接出射未經物體反射的光線，以及經過指紋反射後的光線，因此，物體影像受自該光源13直接出射光線干擾，使得解析度下降而降低物體對比度。However, the image capturing device 14 of the optical image recognition system 1 captures the light reflected from the object directly from the light source 13 and the light reflected by the fingerprint. Therefore, the object image is directly emitted from the light source 13. Light interference causes the resolution to drop and the contrast of the object to be reduced.
因此，本發明之目的，即在提供一種提高影像解析對比增加認證成功率的導光模組。Therefore, an object of the present invention is to provide a light guiding module that improves image resolution and increases authentication success rate.
於是，本發明提高影像對比的導光模組包含一光擴散圍壁、一透光壓板、一光源及一光擴散板，該透光壓板供待辨識物件放置或掃描且設於該導光圍壁上方，該光源設置於該透光壓板下方，該光擴散板設置於該透光壓板與光源間，包括一相對一取像裝置開設的通光孔。Therefore, the light guiding module for improving image contrast comprises a light diffusing wall, a light transmitting plate, a light source and a light diffusing plate, wherein the light transmitting plate is placed or scanned for the object to be identified and is disposed on the light guiding wall Above the wall, the light source is disposed under the transparent platen. The light diffusing plate is disposed between the transparent platen and the light source, and comprises a light-passing hole formed by an image capturing device.
本發明的該光擴散圍壁、光擴散板與透光壓板共同圍繞界定一腔體，該光源藉光擴散圍壁與光擴散板提供該腔體均勻光場，使待辨識物體影像對比提高與更加清晰，以提高影像辨識率。The light diffusing wall, the light diffusing plate and the light transmitting platen of the invention jointly define a cavity, and the light source provides a uniform light field of the cavity by the light diffusion surrounding wall and the light diffusing plate, so that the image contrast of the object to be recognized is improved. Clearer to improve image recognition rate.
有關本發明之前述及其他技術內容、特點與功效，在以下配合參考圖式之兩個較佳實施例的詳細說明中，將可清楚的呈現。The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.
在本發明被詳細描述之前，要注意的是，在以下的說明內容中，類似的元件是以相同的編號來表示。Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.
參閱圖3，本發明提高影像對比的導光模組之第一較佳實施例包含一光擴散圍壁2、一透光壓板3、二光源4及一光擴散板5。Referring to FIG. 3, a first preferred embodiment of the light guiding module for improving image contrast of the present invention comprises a light diffusing wall 2, a light transmitting platen 3, two light sources 4, and a light diffusing plate 5.
該等光源4與一取像裝置6安裝於一電路板7上，且該電路板7設置於該光擴散圍壁2底端，而該等光源4及取像裝置6位於該光擴散圍壁2內。The light source 4 and the image capturing device 6 are mounted on a circuit board 7, and the circuit board 7 is disposed at the bottom end of the light diffusing wall 2, and the light source 4 and the image capturing device 6 are located at the light diffusing wall. 2 inside.
該透光壓板3設於該導光圍壁2上方，用於供待辨識物體放置與掃描，使該取像裝置6擷取經過該透光壓板3反射而回的影像，且該透光壓板3是採用玻璃或塑膠等透明或半透明材質製成。The transparent platen 3 is disposed above the light guiding wall 2 for placing and scanning an object to be recognized, so that the image capturing device 6 captures an image reflected by the transparent platen 3, and the transparent platen 3 is made of transparent or translucent material such as glass or plastic.
此外，該透光壓板3也可採用具有導電、抗反射或觸控功效的透明材質製成，材質選用端視使用需求而變更，為熟習本技術領域人士所熟知故不贅述。In addition, the transparent platen 3 can also be made of a transparent material having electrical conductivity, anti-reflection or touch function, and the material is changed according to the needs of the user, and is not known to those skilled in the art.
該等光源4設置於該透光壓板3下方。The light sources 4 are disposed below the light transmissive platen 3.
該光擴散板5設置於該透光壓板3與光源4間，包括一相對該取像裝置6開設的通光孔51，供待辨識反射的光線通過，使該取像裝置6擷取物體影像。The light diffusing plate 5 is disposed between the light transmitting platen 3 and the light source 4, and includes a light passing hole 51 formed in the image capturing device 6 for the light to be recognized and reflected, so that the image capturing device 6 captures the object image. .
在本較佳實施例中，該光擴散板5與該光擴散圍壁2為個別元件而非一體成型，值得一提的是，該光擴散圍壁2與光擴散板5也可為一體成型(圖未示)。In the preferred embodiment, the light diffusing plate 5 and the light diffusing wall 2 are formed as individual components instead of being integrally formed. It is worth mentioning that the light diffusing wall 2 and the light diffusing plate 5 may also be integrally formed. (not shown).
該光擴散圍壁2與光擴散板5是透明或半透明塑膠材質所製成，更進一步說明的是，該光擴散圍壁2與光擴散板5為聚碳酸酯(polycarbonate)、聚甲基丙烯酸甲酯(poly-methyl-meth-acrylate，PMMA，又名壓克力，Acrylic)，或其他可透光的光擴散材質所製成，且折射率範圍為1.2至2.0。The light diffusing wall 2 and the light diffusing plate 5 are made of a transparent or translucent plastic material. Further, the light diffusing wall 2 and the light diffusing plate 5 are made of polycarbonate or polymethyl. Poly-methyl-meth-acrylate (PMMA, also known as Acrylic), or other light-transmissive light diffusing materials with a refractive index ranging from 1.2 to 2.0.
該光擴散圍壁2、光擴散板5與透光壓板3共同圍繞界定一腔體8，該等光源4出射的光線藉由該光擴散圍壁2與光擴散板5，提供形成於該腔體8內的均勻光場，均勻光場照射於待辨識物體上將可使物體影像對比提高與更加清晰，以提高辨識率。The light diffusing wall 2, the light diffusing plate 5 and the light transmitting plate 3 together define a cavity 8. The light emitted by the light source 4 is formed in the cavity by the light diffusing wall 2 and the light diffusing plate 5. The uniform light field in the body 8 and the uniform light field illuminating the object to be recognized will improve the contrast and clearness of the object image to improve the recognition rate.
值得一提的是，該導光模組也可包含數量為一或二以上的光源4，該光擴散圍壁2與光擴散板5表面也可形成微結構(圖未示)，有助於改變光線折射路徑，而更能引導光線均勻散佈。It is worth mentioning that the light guiding module may also include one or more light sources 4, and the light diffusing wall 2 and the surface of the light diffusing plate 5 may also form a microstructure (not shown), which helps Change the light refraction path and guide the light evenly.
此外，該導光模組也可更包含一設置於該光擴散板5上的光學膜片(圖未示)，使該光擴散板5的出光型態為極化光，例如線性極化光、圓極化光或單一極化光等，其中以單一極化光尤佳，藉由單一極化光的入射，而使得影像反射光具有較佳的單一方向性，讓影像的光訊號不受其他雜散光線的干擾，進而提高影像的解析度與對比。In addition, the light guiding module may further include an optical film (not shown) disposed on the light diffusing plate 5, such that the light emitting pattern of the light diffusing plate 5 is polarized light, such as linearly polarized light. Circularly polarized light or single polarized light, etc., wherein single polarized light is preferred, and the incident light of the image has a better single directivity, so that the optical signal of the image is not affected by the incident of a single polarized light. Interference from other stray light, which in turn improves the resolution and contrast of the image.
參閱圖4，本發明提高影像對比的導光模組的第二較佳實施例與該第一較佳實施例構件與組裝方式大致相同，不同之處在於該第二較佳實施例中，該光擴散圍壁2包括一鄰接該等光源4的光耦合面21，該光耦合面21罩設於該等光源4上，增加耦合面積，讓更多由該等光源4出射的光經由該光耦合面21耦合進入該光擴散圍壁2與光擴散板5，使該腔體8內的光場更加均勻。Referring to FIG. 4, a second preferred embodiment of the light guide module for improving image contrast of the present invention is substantially the same as the assembly and assembly method of the first preferred embodiment, except that in the second preferred embodiment, the second preferred embodiment The light-diffusing wall 2 includes a light-coupling surface 21 adjacent to the light sources 4, and the light-coupling surface 21 is disposed on the light sources 4 to increase the coupling area, so that more light emitted by the light sources 4 passes through the light. The coupling surface 21 is coupled into the light diffusion enclosure 2 and the light diffusing plate 5 to make the light field in the cavity 8 more uniform.
參閱圖5與圖2，圖2為習用結構的指紋影像圖，圖5為本較佳實施例的指紋影像圖，可知本發明確實大幅提高影像解析度與對比。Referring to FIG. 5 and FIG. 2, FIG. 2 is a fingerprint image of a conventional structure, and FIG. 5 is a fingerprint image of the preferred embodiment. It can be seen that the present invention significantly improves image resolution and comparison.
在本較佳實施例中，該光擴散圍壁2由該等光源4朝該光擴散板5呈逐漸向內縮的導角設置，導引光線朝該光擴散板5的方向均勻分布，此外，該光擴散圍壁2與光擴散板5一體成型。In the preferred embodiment, the light diffusing wall 2 is disposed by the light source 4 toward the light diffusing plate 5 at a gradually decreasing angle, and the guiding light is uniformly distributed in the direction of the light diffusing plate 5, The light diffusion enclosure 2 is integrally formed with the light diffusion plate 5.
值得一提的是，該光擴散圍壁2與光擴散板5也可為個別元件再彼此安裝成型。(圖皆未示)It is worth mentioning that the light diffusion enclosure 2 and the light diffusing plate 5 can also be formed separately for individual components. (all are not shown)
綜上所述，該等光源4設置於該光擴散圍壁2底端，且該等光源4所出射的光線經由該光擴散圍壁2與光擴散板5導引，在該腔體8內形成均勻光場，使得影像更加清晰，提高影像的解析度與對比，以提高辨識率，故確實能達成本發明之目的。In summary, the light sources 4 are disposed at the bottom end of the light diffusion enclosure 2, and the light emitted by the light sources 4 is guided through the light diffusion enclosure 2 and the light diffusion plate 5, and the cavity 8 is The uniform light field is formed to make the image clearer, and the resolution and contrast of the image are improved to improve the recognition rate, so that the object of the present invention can be achieved.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.
2．．．光擴散圍壁2. . . Light diffusion wall
21．．．光耦合面twenty one. . . Optical coupling surface
3．．．透光壓板3. . . Light platen
4．．．光源4. . . light source
5．．．光擴散板5. . . Light diffuser
51．．．通光孔51. . . Light hole
6．．．取像裝置6. . . Image capture device
7．．．電路板7. . . Circuit board
8．．．腔體8. . . Cavity
圖1是一剖視圖，說明以往現有的US6011860號專利權的一種光學指紋辨識系統；Figure 1 is a cross-sectional view showing an optical fingerprint recognition system of the prior patent US Pat. No. 6,011,860;
圖2是一影像圖，說明以往的指紋影像；2 is an image diagram illustrating a conventional fingerprint image;
圖3是一剖視圖，說明本發明一種提高影像對比的導光模組的第一較佳實施例；3 is a cross-sectional view showing a first preferred embodiment of a light guiding module for improving image contrast according to the present invention;
圖4是一剖視圖，說明本發明一種提高影像對比的導光模組的第二較佳實施例；及4 is a cross-sectional view showing a second preferred embodiment of a light guiding module for improving image contrast according to the present invention; and
圖5是一影像圖，說明本較佳實施例的指紋影像。Figure 5 is an image diagram illustrating the fingerprint image of the preferred embodiment.
2．．．光擴散圍壁2. . . Light diffusion wall
21．．．光耦合面twenty one. . . Optical coupling surface
3．．．透光壓板3. . . Light platen
4．．．光源4. . . light source
5．．．光擴散板5. . . Light diffuser
51．．．通光孔51. . . Light hole
6．．．取像裝置6. . . Image capture device
7．．．電路板7. . . Circuit board
8．．．腔體8. . . Cavity
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| TW098135937A TWI448973B (en) | 2009-10-23 | 2009-10-23 | A light guide module that improves image contrast |
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| TWI448973B true TWI448973B (en) | 2014-08-11 |
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| US9934418B2 (en) | 2015-12-03 | 2018-04-03 | Synaptics Incorporated | Display integrated optical fingerprint sensor with angle limiting reflector |
| US10055637B2 (en) | 2016-12-07 | 2018-08-21 | Synaptics Incorporated | Optical sensor with substrate light filter |
| US10108841B2 (en) | 2016-03-31 | 2018-10-23 | Synaptics Incorporated | Biometric sensor with diverging optical element |
| US10147757B2 (en) | 2015-02-02 | 2018-12-04 | Synaptics Incorporated | Image sensor structures for fingerprint sensing |
| US10169630B2 (en) | 2015-12-03 | 2019-01-01 | Synaptics Incorporated | Optical sensor for integration over a display backplane |
| US10176355B2 (en) | 2015-12-03 | 2019-01-08 | Synaptics Incorporated | Optical sensor for integration in a display |
| US10181070B2 (en) | 2015-02-02 | 2019-01-15 | Synaptics Incorporated | Low profile illumination in an optical fingerprint sensor |
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| US10705272B2 (en) | 2015-02-02 | 2020-07-07 | Will Semiconductor (Shanghai) Co., Ltd. | Optical fingerprint sensor |
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| US10311276B2 (en) | 2017-02-22 | 2019-06-04 | Synaptics Incorporated | Under display optical fingerprint sensor arrangement for mitigating moiré effects |
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| TW201115479A (en) | 2011-05-01 |
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