Search

EP-4027190-B1 - LINE RECOGNITION DEVICE AND DISPLAY DEVICE

EP4027190B1EP 4027190 B1EP4027190 B1EP 4027190B1EP-4027190-B1

Inventors

  • TAO, Jingfu
  • CHENG, Pengfei
  • YU, LU
  • CHANG, KANGLE
  • ZHU, Heling
  • SANG, Jian
  • LIAO, Chuandong
  • CHEN, YINWEI
  • LIU, JINGANG

Dates

Publication Date
20260506
Application Date
20190904

Claims (9)

  1. A texture recognition device (100), comprising: a backlight element (110), configured to provide first backlight; a light constraint element (120), configured to perform a light divergence angle constraint process on the first backlight to obtain second backlight with a divergence angle within a preset angle range, wherein the second backlight is transmitted to a detection object; and a photosensitive element (130), configured to detect the second backlight reflected by a texture of the detection object to recognize a texture image of the texture of the detection object; wherein the light constraint element (120) comprises a collimating film (121), the collimating film (121) has a mesh structure and comprises a plurality of hollowed-out regions (1210), and each of the plurality of hollowed-out regions (1210) is configured to transmit part first backlight, whose divergence angle is within the preset angle range, of the first backlight to obtain the second backlight; wherein the backlight element (110) comprises an edge-lit backlight light source (112) and a light guide plate (113), and the light guide plate (113) is arranged on a light exit side of the edge-lit backlight light source (112), the edge-lit backlight light source (112) is configured to provide light source backlight, and the light source backlight is transmitted through the light guide plate (113) to obtain initial backlight, and the first backlight comprises the initial backlight, characterized in that : the light guide plate (113) and the edge-lit backlight light source (112) are arranged along a direction, and in the direction, a density of hollowed-out regions (1210), among the plurality of hollowed-out regions (1210), on a side of the collimating film (121) close to the edge-lit backlight light source (112) is less than a density of hollowed-out regions (1210), among the plurality of hollowed-out regions (1210), on a side of the collimating film (121) away from the edge-lit backlight light source (112).
  2. The texture recognition device (100) according to claim 1, wherein the plurality of hollowed-out regions (1210) are arranged in an array, and a shape of each of the plurality of hollowed-out regions (1210) comprises a square, a rectangle, a regular triangle, a regular hexagon, or a circle; for example, a thickness of the collimating film (121) ranges from 400µm to 800µm.
  3. The texture recognition device (100) according to claim 2, wherein a size of each of the plurality of hollowed-out regions (1210) ranges from 25µm to 65µm, which comprises: in a case where the shape of each of the plurality of hollowed-out regions (1210) is a square, a side length of the square ranges from 25µm to 65µm; in a case where the shape of each of the plurality of hollowed-out regions (1210) is a rectangle, a long side of the rectangle ranges from 25µm to 65µm, a short side of the rectangle ranges from 25µm to 65µm, and a length of the long side is greater than a length of the short side; in a case where the shape of each of the plurality of hollowed-out regions (1210) is a regular triangle, a side length of the regular triangle ranges from 25µm to 65µm; in a case where the shape of each of the plurality of hollowed-out regions (1210) is a regular hexagon, a distance between two parallel sides of the regular hexagon ranges from 25µm to 65µm; and in a case where the shape of each of the plurality of hollowed-out regions (1210) is a circle, a diameter of the circle ranges from 25µm to 65µm.
  4. The texture recognition device (100) according to any one of claims 1-3, wherein the backlight element (110) further comprises diffusion sheet (115), a first prism sheet (116), and a second prism sheet (117), the diffusion sheet (115) is on a side of the light guide plate (113) close to the light constraint element (120), the first prism sheet (116) is on a side of the diffusion sheet (115) close to the light constraint element (120), and the second prism sheet (117) is on a side of the first prism sheet (116) close to the light constraint element (120), the light source backlight sequentially passes through the light guide plate (113), the diffusion sheet (115), the first prism sheet (116), and the second prism sheet (117) to obtain intermediate backlight, and the first backlight comprises the intermediate backlight.
  5. The texture recognition device (100) according to any one of claims 1-4, wherein the backlight element (110) further comprises a reflecting sheet (114), the reflecting sheet (114) is on a side of the backlight element (110) away from the light constraint element (120), and is configured to reflect light incident on the reflecting sheet (114) to obtain reflected light, and the first backlight further comprises the reflected light.
  6. The texture recognition device (100) according to any one of claims 1-4, wherein the photosensitive element (130) comprises a plurality of photosensitive sensors arranged in an array, and the plurality of photosensitive sensors are in one-to-one correspondence to the plurality of hollowed-out regions (1210).
  7. The texture recognition device (100) according to claim 6, wherein each of the plurality of photosensitive sensors comprises a light transmitting region (1311) and a photoelectric conversion region (1312); for example, the light transmitting region (1311) at least partially surrounds the photoelectric conversion region (1312).
  8. The texture recognition device (100) according to any one of claims 1-7, wherein the texture of the detection object comprises a skin (200) corresponding to a fingerprint of a user, and the texture image comprises a fingerprint image; for example, the preset angle range is 0 degree to 20 degrees.
  9. A display device, comprising the texture recognition device (100) according to any one of claims 1-8.

Description

TECHNICAL FIELD Embodiments of the present disclosure relate to a texture recognition device and a display device. BACKGROUND Fingerprint is a texture formed by concave and convex skin at an end of human finger, in which a convex position is called ridge and a concave position is called valley. Because everyone's fingerprints are different, fingerprint identification technologies have been widely used for identifying personal identification. Similarly, people have developed palm print recognition technology. Among many fingerprint acquisition technologies, the emergence and popularization of an optical fingerprint acquisition technology promotes the rapid collection and verification of fingerprints on site. However, in the process of optical fingerprint acquisition, if the incident angle of the light incident on the finger is too large, the large-angle incident light is reflected by the finger and will cause crosstalk to the fingerprint recognition, resulting in the inability to accurately identify the valleys and ridges of the fingerprint. US 2019/034686 describes an optical fingerprint module. CN 107 798 278 describes a fingerprint imaging module. SUMMARY It is an object of the present invention to provide a texture recognition device and a display device. The object is achieved by the features of the respective independent claims. Further embodiments are defined in the respective dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS In order to clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described in the following; and it is obvious that the described drawings are only related to some embodiments of the present disclosure and thus are not limitative to the present disclosure. FIG. 1A is a schematic block diagram of a texture recognition device provided by embodiments of the present disclosure;FIG. 1B is a schematic diagram showing light, whose divergence angle is outside a preset angle range, incident on a user's skin;FIG. 1C is a schematic diagram showing second backlight incident on a user's skin provided by embodiments of the present disclosure;FIG. 2A is a structural schematic diagram of a texture recognition device provided by embodiments of the present disclosure not falling within the scope of the claims;FIG. 2B is another structural schematic diagram of a texture recognition device provided by embodiments of the present disclosure;FIG. 3A is a structural schematic diagram of a collimating film in the texture recognition device in FIG. 2A or FIG. 2B;FIG. 3B is a schematic cross-sectional view along a line P-P' in FIG. 3A;FIG. 4 is yet another structural schematic diagram of a texture recognition device provided by embodiments of the present disclosure;FIG. 5 is a structural schematic diagram of a light guide plate in the texture recognition device shown in FIG. 4;FIG. 6 is a structural schematic diagram of an inverse prism sheet in the texture recognition device shown in FIG. 4 not falling within the scope of the claims;FIG. 7 is a structural schematic diagram of a photosensitive element in the texture recognition device shown in FIGS. 2A, 2B and 4;FIG. 8A is another structural schematic diagram of a texture recognition device provided by embodiments of the present disclosure not falling within the scope of the claims;FIG. 8B is another structural schematic diagram of a texture recognition device provided by embodiments of the present disclosure;FIG. 8C is a schematic diagram showing a three-dimensional structure of a first prism sheet and a second prism sheet in the texture recognition device in FIGS. 8A and 8B;FIG. 9A is a schematic diagram of a fingerprint detected by the texture recognition device shown in FIG. 4; andFIG. 9B is a schematic diagram of a fingerprint detected by a texture recognition device having a conventional backlight module. DETAILED DESCRIPTION In order to make objects, technical details and advantages of the embodiments of the present disclosure apparent, the technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the present disclosure. Apparently, the described embodiments are just a part but not all of the embodiments of the present disclosure. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the present disclosure. Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "first," "second," etc., which are used in the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. Also, the terms such as "a," "an," etc., are not intended to limit the amount,