Display screen and display device with under-screen recognition function

Abstract

The present invention provides a display screen and a display device with an under-screen recognition function, comprising: a display layer, the display layer having a fingerprint receiving area; a first quantum dot light conversion film, the first quantum dot light conversion film being located below the display layer; a light source layer, the light source layer being located below the first quantum dot light conversion film, the light source layer comprising a backlight light source, the backlight light source being used to excite the first quantum dot light conversion film; an identification layer, the identification layer being located below the light source layer, a fingerprint recognition device being located in the identification layer, the fingerprint receiving area and the fingerprint recognition device having at least a partial overlap in their orthographic projection in the identification layer; an auxiliary light source, the auxiliary light source being arranged in parallel with the backlight light source, or the auxiliary light source being located in the fingerprint recognition device, or the auxiliary light source being arranged at the backlight light source and in the fingerprint recognition device at the same time, the light energy emitted by the auxiliary light source being recognized by the fingerprint recognition device. The present invention solves the problems of low imaging quality and unstable recognition in under-screen recognition of display screens in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a display screen and a display device with an under-screen recognition function. Background Art

[0002] With the rapid development of electronic consumer products, the emergence of fingerprint unlocking not only meets the needs of personal information security, but also meets the needs of simplicity and convenience in modern life. The fingerprint under the screen can well meet people's needs for personal information confidentiality, and can maximize the beauty and experience of the entire display device.

[0003] At present, there are three main ways to realize under-screen fingerprint: First, optical under-screen fingerprint mainly relies on light reflection to detect fingerprint circuit. Since LCD (liquid crystal display) screen cannot emit light by itself, the products that support optical under-screen fingerprint recognition currently use OLED (organic light-emitting semiconductor), but the high cost of OLED makes the display device more expensive. Second, ultrasonic under-screen fingerprint recognition technology is based on ultrasound. The sensor first emits ultrasound to the surface of the finger and receives the echo. A 3D image is constructed by using the different density between the skin and air on the fingerprint surface, and then compared with the information already on the terminal to achieve the purpose of fingerprint recognition. The advantage of ultrasonic under-screen fingerprint recognition is that it has strong penetration and high anti-stain ability. Even wet and dirty fingers can still be perfectly recognized. Ultrasonic waves have excellent penetration and support liveness detection. Because 3D fingerprint recognition images can be obtained, security is higher than other under-screen fingerprint recognition solutions. However, ultrasonic under-screen fingerprint recognition also has many urgent problems to be solved. For example, low imaging quality, immature technology, low output, etc. Therefore, ultrasonic under-screen fingerprint recognition has not been widely promoted for commercial use. Third, capacitive fingerprint recognition is relatively more mature, but it is quite difficult to transfer capacitive fingerprint recognition to under the screen, and its weak penetration ability limits its development.

[0004] That is to say, the under-screen recognition of the display screen in the prior art has the problems of low imaging quality and unstable recognition. Summary of the invention

[0005] The main purpose of the present invention is to provide a display screen and a display device with an under-screen recognition function to solve the problems of low imaging quality and unstable recognition in the under-screen recognition of the display screen in the prior art.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present invention, a display screen with an under-screen recognition function is provided, comprising: a display layer, the display layer having a fingerprint receiving area, the display layer comprising a cover plate, a liquid crystal panel and an optical film, the liquid crystal panel is located below the cover plate, and the optical film is located below the liquid crystal panel; a first quantum dot light conversion film, the first quantum dot light conversion film is located below the display layer; a light source layer, the light source layer is located below the first quantum dot light conversion film, the light source layer comprises a backlight light source, a light guide plate or a diffuser plate, and a reflector, the backlight light source is used to excite the first quantum dot light conversion film, and the reflector is located below the light guide plate or the backlight light source; an identification layer, the identification layer is located below the light source layer, a fingerprint recognition device is located in the identification layer, and the fingerprint receiving area and the fingerprint recognition device have at least a partially overlapping orthographic projections in the identification layer; an auxiliary light source, the auxiliary light source is arranged in parallel with the backlight light source, or the auxiliary light source is located in the fingerprint recognition device, or the auxiliary light source is arranged at the backlight light source and in the fingerprint recognition device at the same time; wherein the wavelength λ of the light emitted by the auxiliary light source 412 The wavelength is greater than the wavelength λ of light emitted by at least part of the quantum dots in the first quantum dot light conversion film. 30 , the light energy emitted by the auxiliary light source can be recognized by the fingerprint recognition device.

[0007] Furthermore, the quantum dots in the first quantum dot light conversion film include at least one of blue quantum dots, green quantum dots, red quantum dots, and infrared quantum dots.

[0008] Furthermore, the quantum dots in the first quantum dot light conversion film include at least two of blue quantum dots, green quantum dots, red quantum dots, and infrared quantum dots, one of which is an infrared quantum dot, and the wavelength of light emitted by the infrared quantum dot is λ 301 >780nm.

[0009] Furthermore, the wavelength λ of the light emitted by the auxiliary light source is 412 ≥680nm.

[0010] Furthermore, the energy of the light emitted by the infrared quantum dots accounts for 25%-50% of the energy of the light emitted by all the quantum dots in the first quantum dot light conversion film.

[0011] Furthermore, the area of ​​the orthographic projection of the fingerprint receiving area in the identification layer is less than or equal to the area of ​​the orthographic projection of the fingerprint identification device in the identification layer.

[0012] Furthermore, the fingerprint recognition device can recognize the wavelength λ of light 51 >680nm.

[0013] Furthermore, the cover plate has an optical layer, which can achieve visible light transmission in the 380nm to 780nm band. The optical layer has an opening, which is located above the fingerprint recognition device, and the opening at least partially overlaps with the positive projection of the fingerprint recognition device on the display layer.

[0014] Furthermore, a second quantum dot light conversion film is provided on a side of the fingerprint recognition device facing the light source layer.

[0015] According to another aspect of the present invention, a display device is provided, comprising the above-mentioned display screen with under-screen recognition function.

[0016] According to the technical solution of the present invention, a display screen with an under-screen recognition function includes a display layer, a light source layer, a recognition layer and an auxiliary light source, wherein the display layer has a fingerprint receiving area, the display layer includes a cover plate, a liquid crystal panel and an optical film, the liquid crystal panel is located below the cover plate, and the optical film is located below the liquid crystal panel; a first quantum dot light conversion film, the first quantum dot light conversion film is located below the display layer; the light source layer is located below the first quantum dot light conversion film, the light source layer includes a backlight light source, a light guide plate or a diffuser plate, and a reflector, the backlight light source is used to excite the first quantum dot light conversion film, and the reflector is located below the light guide plate or the backlight light source; the recognition layer is located below the light source layer, the fingerprint recognition device is located in the recognition layer, and the fingerprint receiving area and the fingerprint recognition device have at least a partially overlapping orthographic projection in the recognition layer; the auxiliary light source is arranged in parallel with the backlight light source, or the auxiliary light source is located in the fingerprint recognition device, or the auxiliary light source is arranged at the backlight light source and in the fingerprint recognition device at the same time; wherein the wavelength λ of the light emitted by the auxiliary light source 412 Greater than the wavelength λ of light emitted by at least part of the quantum dots in the first quantum dot light conversion film 30 , the light energy emitted by the auxiliary light source can be recognized by the fingerprint recognition device.

[0017] By setting the first quantum dot light conversion film on the display screen, the light emitted by the light source layer is converted to form white light containing red, green and blue components. The white light is directed to the display layer to realize display, making the pattern displayed on the display layer brighter. When the finger contacts the display layer, part of the light will be blocked and reflected by the finger. Because of the difference in fingerprints, the reflected light will also be different. When the reflected light passes through the first quantum dot light conversion film with fingerprint information, the visible light component contained in the reflected light can be absorbed and converted by the first quantum dot light conversion film, effectively reducing the proportion of noise light such as visible light in the reflected light. This arrangement improves the imaging quality of the display screen in the fingerprint recognition device, increases the accuracy of fingerprint recognition, and realizes rapid recognition. The liquid crystal panel is located below the cover plate so that the cover plate protects the liquid crystal panel. The first quantum dot light conversion film converts the light emitted by the light source layer and directs it to the liquid crystal panel to form a display on the liquid crystal panel. The optical film is located between the liquid crystal panel and the first quantum dot light conversion film. The first quantum dot light conversion film converts the light emitted by the light source layer and then passes through the optical film to achieve brightening and polarization matching, so as to realize display on the liquid crystal panel. The light guide plate converts the light emitted by the backlight source into a surface light source. The reflective sheet reflects the light in the direction of the light guide plate so that the light emitted by the backlight source is directed to the display layer for display, thereby increasing the utilization rate of the light emitted by the backlight source and effectively reducing the light loss of the light source in other directions. The setting of the auxiliary light source facilitates the provision of light source for fingerprint recognition, which can improve the efficiency and quality of fingerprint recognition in dark conditions. At the same time, the wavelength λ of the light emitted by the auxiliary light source 412 Greater than the wavelength λ of light emitted by at least some of the quantum dots 30 The light converted by the first quantum dot light conversion film can be reduced from being recognized by the fingerprint recognition device, thereby reducing the influence of the light converted by the first quantum dot light conversion film on the reflected light and increasing the accuracy of fingerprint recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic cross-sectional view of the overall structure of a display screen according to the first embodiment of the present invention is shown, wherein the backlight source is an edge-lit type; and

[0020] Figure 2 A schematic cross-sectional view of the overall structure of a display screen according to a second embodiment of the present invention is shown;

[0021] Figure 3 Shows Figure 2 An angled view of a display screen in FIG.

[0022] Figure 4A schematic cross-sectional view of the overall structure of a display screen according to a third embodiment of the present invention is shown;

[0023] Figure 5 The figure shows a schematic cross-sectional view of the overall structure of a display screen according to a fourth embodiment of the present invention, wherein the backlight source is a direct-down type.

[0024] The above drawings include the following reference numerals:

[0025] 10. Display layer; 11. Cover plate; 12. Liquid crystal panel; 13. Optical film; 14. Optical layer; 141. Opening; 20. Finger; 30. First quantum dot light conversion film; 40. Light source layer; 411. Backlight light source; 412. Auxiliary light source; 42. Light guide plate; 43. Reflective sheet; 44. Diffuser; 50. Recognition layer; 51. Fingerprint recognition device; 52. Second quantum dot light conversion film; 60. Reflected light. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0029] In order to solve the problems of low imaging quality and unstable recognition in under-screen recognition of display screens in the prior art, the present invention provides a display screen and a display device with an under-screen recognition function.

[0030] like Figures 1 to 5As shown, the display screen with under-screen recognition function includes a display layer 10, a light source layer 40, an identification layer 50 and an auxiliary light source 412, the display layer 10 has a fingerprint receiving area, the display layer 10 includes a cover plate 11, a liquid crystal panel 12 and an optical film 13, the liquid crystal panel 12 is located below the cover plate 11, and the optical film 13 is located below the liquid crystal panel 12; a first quantum dot light conversion film 30, the first quantum dot light conversion film 30 is located below the display layer 10; the light source layer 40 is located below the first quantum dot light conversion film 30, the light source layer 40 includes a backlight source 411, a light guide plate 42 or a diffuser plate 44, and a reflective sheet 4 3. The backlight source 411 is used to excite the first quantum dot light conversion film 30. The reflective sheet 43 is located below the light guide plate 42 or the backlight source 411. The identification layer 50 is located below the light source layer 40. The fingerprint identification device 51 is located in the identification layer 50. The fingerprint receiving area and the positive projection of the fingerprint identification device 51 in the identification layer 50 at least partially overlap. The auxiliary light source 412 is arranged in parallel with the backlight source 411, or the auxiliary light source 412 is located in the fingerprint identification device 51, or the auxiliary light source 412 is arranged at the backlight source 411 and in the fingerprint identification device 51 at the same time. The wavelength λ of the light emitted by the auxiliary light source 412 is 412 is greater than the wavelength λ of light emitted by at least part of the quantum dots in the first quantum dot light conversion film 30 30 , the light energy emitted by the auxiliary light source 412 can be recognized by the fingerprint recognition device 51.

[0031] By setting the first quantum dot light conversion film 30 on the display screen, the light emitted by the light source layer 40 is converted to form white light containing red, green and blue components. The white light is directed to the display layer 10 to realize display, making the pattern displayed by the display layer 10 brighter. When the finger 20 contacts the display layer 10, a part of the light will be blocked and reflected by the finger 20. Due to the difference in fingerprints, the reflected light will also be different. When the reflected light 60 passes through the first quantum dot light conversion film 30 with fingerprint information, the visible light component contained in the reflected light 60 can be absorbed and converted by the first quantum dot light conversion film 30, effectively reducing the proportion of noise light such as visible light in the reflected light 60. This arrangement improves the imaging quality of the display screen in the fingerprint recognition device 51, increases the accuracy of fingerprint recognition, and realizes rapid recognition. The liquid crystal panel 12 is located below the cover plate 11 so that the cover plate 11 forms protection for the liquid crystal panel 12; the first quantum dot light conversion film 30 converts the light emitted by the light source layer 40 and emits it toward the liquid crystal panel 12, forming a display on the liquid crystal panel 12; the optical film 13 is located between the liquid crystal panel 12 and the first quantum dot light conversion film 30; the first quantum dot light conversion film 30 converts the light emitted by the light source layer 40 and realizes brightening and polarization matching through the optical film 13, thereby realizing quantum dot display on the liquid crystal panel 12; the light guide plate 42 converts the light emitted by the backlight light source 411 into a surface light source; the reflective sheet 43 reflects the light in the direction of the light guide plate 42, so that the light emitted by the backlight light source 411 is emitted toward the display layer 10 to realize display, thereby increasing the utilization rate of the light emitted by the backlight light source 411 and effectively reducing the light loss in other directions. The reflective sheet 43 reflects the light emitted by the backlight source 411 toward the light guide plate 42, so that the light emitted by the backlight source 411 is emitted toward the first quantum dot light conversion film 30. The auxiliary light source 412 is provided to provide a signal light source for the fingerprint recognition device 51, which can improve the efficiency and quality of fingerprint recognition in a dark state. At the same time, the wavelength λ of the light emitted by the auxiliary light source 412 is 412 Greater than the wavelength λ of light emitted by at least some of the quantum dots 30 , which can reduce the light converted by the first quantum dot light conversion film 30 to be recognized by the fingerprint recognition device 51, thereby reducing the influence of the light converted by the first quantum dot light conversion film 30 on the reflected light 60, and increasing the accuracy of fingerprint recognition.

[0032] In this embodiment, the wavelength λ of the light n It means the peak wavelength in a spectrum.

[0033] The optical film 13 can realize the brightening and polarization matching of the converted light of the first quantum dot light conversion film 30 through the combined action of the brightening film, the polarizing film and the corresponding composite structure film, thereby realizing the display on the liquid crystal panel 12. The brightening film and the polarizing film can be conventional brightening films and polarizing films in the art.

[0034] The light guide plate 42 is arranged so that the light emitted by the backlight source 411 can cover the entire display screen, so as to reduce the uneven display phenomenon of the display screen. The reflective sheet 43 reflects the light in the direction of the light guide plate 42, so that the light emitted by the backlight source 411 is directed to the display layer 10 for display, so as to increase the utilization rate of the light emitted by the backlight source 411. The arrangement of the light guide plate 42 and the reflective sheet 43 realizes the conversion of the line light source into the surface light source.

[0035] At least a portion of the light emitted by the light source layer 40 is converted by the first quantum dot light conversion film 30 and is directed toward the display layer 10 to realize display. The finger 20 is in contact with the display layer 10, so that the part of the light directed toward the display layer 10 that is blocked by the finger 20 is reflected to form reflected light 60. The reflected light 60 is directed toward the first quantum dot light conversion film 30, and the first quantum dot light conversion film 30 absorbs and converts the visible light component in the reflected light 60. The identification layer 50 is located below the light source layer 40, and the fingerprint identification device 51 is located in the identification layer 50. The reflected light 60 passes through the first quantum dot light conversion film 30 and is directed toward the fingerprint identification device 51 to identify the fingerprint information in the reflected light 60.

[0036] It should be noted that the optical film 13 and the first quantum dot light conversion film 30 can be two separate film structures, and of course the two can also be a composite film structure that is composited together.

[0037] In the present application, the optical film 13 may include a brightness enhancement film, a polarizing film, and a composite structure of the brightness enhancement film and the polarizing film.

[0038] Optionally, the quantum dots in the first quantum dot light conversion film 30 include at least one of blue quantum dots, green quantum dots, red quantum dots, and infrared quantum dots. The arrangement of blue quantum dots, green quantum dots, and red quantum dots can convert the light emitted by the light source layer 40 into white light containing red, green, and blue components, making the colors displayed by the display layer 10 brighter.

[0039] Optionally, the quantum dots in the first quantum dot light conversion film 30 include at least two of blue quantum dots, green quantum dots, red quantum dots, and infrared quantum dots, one of which is an infrared quantum dot, and the wavelength of light emitted by the infrared quantum dot is λ 301 >780nm. Infrared quantum dots can absorb and convert light in the visible light band, improving the accuracy of fingerprint recognition. Blue quantum dots, green quantum dots and red quantum dots realize wide color gamut display, while improving spectral components, reducing stray light, and improving color purity, thereby enhancing the display effect of the display layer, and the light emitted by infrared quantum dots can be used for fingerprint recognition after fingerprint contact and reflection. In this application, the wavelength λ of the light emitted by the auxiliary light source 412 is 412The light emitted by the infrared quantum dots can be recognized by the fingerprint recognition device 51. When the auxiliary light source 412 is turned off or damaged, the fingerprint recognition function can be achieved only by relying on the cooperation between the backlight source 411 and the infrared quantum dots.

[0040] It should be noted that in the quantum dot display structure of the first quantum dot light conversion film 30, the backlight source 411 can use a visible light source with a wavelength less than 500nm or a white light source with a color temperature greater than 10000K as the backlight source. In some preferred embodiments, a blue light source is used to excite the quantum dots to emit light. Of course, the backlight source 411 can also use blue-violet light, purple light or ultraviolet light as the light source.

[0041] The auxiliary light source 412 and the backlight light source 411 can be turned on and off at the same time, or can be turned on and off at different times, and can be set according to specific usage requirements.

[0042] It should be noted that the setting of the auxiliary light source 412 enables the display screen to realize fingerprint recognition in a dark state. When the backlight source 411 is not working, fingerprint recognition can be performed only by relying on the light emitted by the auxiliary light source 412. That is to say, when the backlight source 411 is not working, the light emitted by the auxiliary light source 412 is directed to the finger 20, and the finger 20 reflects the light emitted by the auxiliary light source 412 to form a reflected light 60, and the reflected light 60 is directed to the fingerprint recognition device 51, so that the fingerprint recognition device 51 recognizes the fingerprint information in the reflected light 60. Since there is no other light to interfere with the fingerprint recognition device 51 in a dark state, the fingerprint recognition device 51 can recognize more accurately in a dark state.

[0043] Of course, the auxiliary light source 412 and the infrared quantum dots can also be used to cooperate with each other to perform fingerprint recognition in a dark state. That is to say, in a dark state, the light emitted by the auxiliary light source 412 is converted by the infrared quantum dots and then emitted to the finger 20, and the finger 20 reflects the light to form a reflected light 60, and the reflected light 60 is emitted to the fingerprint recognition device 51, so that the fingerprint recognition device 51 can recognize the fingerprint information in the reflected light 60, so as to improve the recognition accuracy of the display screen in a dark state. When the auxiliary light source 412 cooperates with the infrared quantum dots to realize fingerprint recognition, it is only necessary that the wavelength of the light emitted by the infrared quantum dots matches that of the fingerprint recognition device 51.

[0044] Optionally, the auxiliary light source 412 may be an infrared LED, or a QD-LED that emits infrared light based on short-wave excitation of infrared quantum dots, or an OLED or QLED realized by electroluminescence.

[0045] It should be noted that the wavelength range of different quantum dots is defined by the peak emission wavelength of each quantum dot. The range of blue quantum dots is a wavelength greater than 400nm and less than or equal to 490nm; the range of green quantum dots is a wavelength greater than 490nm and less than or equal to 590nm; the range of red quantum dots is a wavelength greater than 590nm and less than or equal to 680nm; the range of infrared quantum dots is a wavelength greater than 780nm and less than or equal to 2000nm.

[0046] It should be noted that, in the present application, the wavelength λ of the light emitted by the auxiliary light source 412 is 412 It will not be greater than the wavelength of light emitted by infrared quantum dots, but it will be greater than the wavelength of light emitted by blue quantum dots, red quantum dots, and green quantum dots. This arrangement can greatly reduce the impact of light in the visible light band on the fingerprint recognition device 51, and increase the stability and accuracy of the fingerprint recognition device 51.

[0047] Specifically, the wavelength λ of the light emitted by the auxiliary light source 412 is 412 ≥680nm. In the present application, the light emitted by the auxiliary light source 412 can be red light between 680nm and 780nm, or near infrared light greater than 780nm. This setting can reduce the influence of visible light on the recognition of the fingerprint recognition device 51, and greatly increase the recognition accuracy of the fingerprint recognition device 51.

[0048] The energy of the light emitted by the infrared quantum dots accounts for 25%-50% of the energy of the light emitted by all the quantum dots in the first quantum dot light conversion film 30. This arrangement allows the infrared quantum dots in the first quantum dot light conversion film 30 to emit light while the blue quantum dots, green quantum dots, and red quantum dots all emit light without affecting the display of the display layer 10.

[0049] In some embodiments, the area of ​​the orthographic projection of the fingerprint receiving area in the identification layer 50 is less than or equal to the area of ​​the orthographic projection of the fingerprint identification device 51 in the identification layer 50 .

[0050] In some preferred embodiments, the fingerprint receiving area and the positive projection of the fingerprint recognition device 51 in the recognition layer 50 at least partially overlap. This arrangement allows the reflected light 60 reflected by the finger pressed on the fingerprint receiving area to be received by the fingerprint recognition device 51, so that the collected fingerprint information can be transmitted to the fingerprint recognition device 51, thereby increasing the accuracy of recognition.

[0051] In some preferred embodiments, the geometric center of the fingerprint receiving area coincides with the geometric center of the fingerprint recognition device 51, and the positive projection of the fingerprint receiving area falls on the fingerprint recognition device 51, so that the light reflected by the fingerprint receiving area can be effectively received by the fingerprint recognition device 51, which greatly increases the accuracy of recognition.

[0052] Optionally, the fingerprint recognition device can recognize the wavelength λ of light 51 >680nm. This configuration enables the fingerprint recognition device to recognize the light emitted by the auxiliary light source 412 and also recognize the light emitted by the infrared quantum dots.

[0053] Preferably, the fingerprint recognition device can recognize the wavelength λ of light 51 ≥900nm. This can reduce the impact of red light in the visible light on identification, greatly increasing the accuracy of fingerprint identification.

[0054] In some embodiments, the backlight source 411 may be, but is not limited to, a common LED light source, a mini-LED, a micro-LED, etc.

[0055] In some embodiments, the peak wavelength of the light emitted by the backlight source 411 is greater than or equal to 380 nm and less than or equal to 480 nm. In some preferred embodiments, the peak wavelength of the light emitted by the backlight source 411 is greater than or equal to 450 nm and less than or equal to 480 nm.

[0056] Embodiment 1

[0057] like Figure 1 As shown, the backlight source 411 is located at one side of the display screen, forming an edge-entry light source layer. In this embodiment, the display screen only has a light guide plate 42 without a diffusion plate 44, and the reflective sheet 43 is only located below the light guide plate 42.

[0058] Embodiment 2

[0059] The difference from the first embodiment is that the specific structure of the cover plate 11 is different.

[0060] In such Figure 2 and Figure 3 In the specific embodiment shown, the cover plate 11 has an optical layer 14, which can achieve visible light transmission in the 380nm to 780nm band, and the optical layer 14 has an opening 141, which is located above the fingerprint recognition device 51, and the opening 141 at least partially overlaps with the positive projection of the fingerprint recognition device 51 on the display layer 10. The setting of the optical layer 14 can not only avoid the influence of external light on fingerprint recognition, but also prevent infrared light from overflowing, further ensuring the accuracy of recognition. In some preferred embodiments, the opening 141 is located directly above the fingerprint recognition device 51, and the area of ​​the positive projection of the opening 141 on the display layer 10 is greater than or equal to the area of ​​the positive projection of the fingerprint recognition device 51 on the display layer 10. This setting can collect a larger area of ​​the fingerprint of the finger 20, so as to smoothly realize the fingerprint recognition function and increase the accuracy of fingerprint recognition.

[0061] Of course, the optical layer 14 can transmit light of the used wavelength band, and no opening is set on the optical layer 14, so that the optical layer can realize fingerprint recognition within the range of the entire screen.

[0062] Embodiment 3

[0063] The difference from the first embodiment is that a second quantum dot light conversion film 52 is further provided at the fingerprint recognition device 51 .

[0064] like Figure 4 As shown, a second quantum dot light conversion film 52 is disposed on the side of the fingerprint recognition device 51 facing the light source layer 40, and the emission wavelength λ of the quantum dot material in the second quantum dot light conversion film 52 is 52 The second quantum dot light conversion film 52 can absorb and convert the visible light component of the light emitted to the fingerprint recognition device 51 into a wavelength of λ 52 The wavelength of light emitted by the second quantum dot light conversion film 52 is λ 52 It cannot be recognized by the fingerprint recognition device 51. 52 Meanwhile, the second quantum dot light conversion film 52 is arranged on the fingerprint recognition system, which can reduce the influence of other light in the light source layer 40 during the fingerprint recognition process of the fingerprint recognition device 51, thereby further ensuring the recognition accuracy.

[0065] Embodiment 4

[0066] The difference from the first embodiment is that the position of the backlight source 411 is different.

[0067] like Figure 5 As shown, of course the backlight source 411 can also be located below the display layer 10 to form a direct-type light source layer. Figure 5 The dotted triangle provided in the structure mainly plays a supporting role. It should be clear that in the embodiment of the direct-type light source layer, the display screen only has a diffusion plate 44 but no light guide plate 42, and the reflective sheet 43 is only located below the backlight source 411.

[0068] The above embodiments list different features separately. Of course, the above different features may also be partially overlapped in one embodiment.

[0069] A display device includes the above-mentioned display screen with under-screen recognition function. The display device can be but is not limited to a mobile phone, a computer, a television, an electronic teaching blackboard, etc.

[0070] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0071] 1. The presence of the first quantum dot light conversion film 30 reduces the interference of visible light on the reflected light 60, and can absorb and convert light in the visible light band to achieve wide color gamut display, while improving the spectral composition, reducing stray light, and improving color purity, thereby enhancing the display effect of the display layer, and at the same time can also improve the recognition accuracy of the fingerprint recognition device 51.

[0072] 2. The setting of the auxiliary light source 412 enables the display screen to be recognized in a dark state. Since the display screen is not affected by visible light in a dark state, the recognition accuracy of the display screen in a dark state is increased, thereby achieving rapid recognition.

[0073] 3. The display screen in this application is not easily affected by visible light and has accurate and stable recognition effects, providing a feasible and economical solution for realizing under-screen fingerprint recognition based on LCD screens.

[0074] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0075] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0076] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A display screen with an under-screen recognition function, It is characterized in that include: A display layer (10), the display layer (10) having a fingerprint receiving area, the display layer comprising a cover plate (11), a liquid crystal panel (12) and an optical film (13), the liquid crystal panel (12) being located below the cover plate (11), and the optical film (13) being located below the liquid crystal panel (12); A first quantum dot light conversion film (30), wherein the first quantum dot light conversion film (30) is located below the display layer (10); A light source layer (40), the light source layer (40) being located below the first quantum dot light conversion film (30), the light source layer (40) comprising a backlight light source (411), a light guide plate (42) or a diffuser plate (44), and a reflective sheet (43), the backlight light source (411) being used to excite the first quantum dot light conversion film (30), and the reflective sheet (43) being located below the light guide plate (42) or the backlight light source (411); an identification layer (50), the identification layer (50) being located below the light source layer (40), the fingerprint identification device (51) being located within the identification layer (50), the fingerprint receiving area and the orthographic projection of the fingerprint identification device (51) in the identification layer (50) at least partially overlapping; an auxiliary light source (412), the auxiliary light source (412) being arranged in parallel with the backlight light source (411), or the auxiliary light source being located in the fingerprint recognition device (51), or the auxiliary light source (412) being arranged at the backlight light source (411) and in the fingerprint recognition device (51) at the same time; The quantum dots in the first quantum dot light conversion film (30) include at least two of blue quantum dots, green quantum dots, red quantum dots, and infrared quantum dots, one of which is the infrared quantum dot, and the wavelength λ of the light emitted by the infrared quantum dot is 301 >780nm; The wavelength λ of the light emitted by the auxiliary light source (412) 412 ≥680nm; Wherein, the light emitted by the auxiliary light source (412) and the light emitted by the infrared quantum dots can both be recognized by the fingerprint recognition device (51); The wavelength λ of the light emitted by the auxiliary light source (412) 412 The wavelength λ of the light emitted by the auxiliary light source (412) is smaller than the wavelength of the light emitted by the infrared quantum dot. 412 The wavelength of light emitted by the auxiliary light source (412) is greater than the wavelength of light emitted by the blue quantum dots, the red quantum dots and the green quantum dots, and the light energy emitted by the auxiliary light source (412) can be converted by the infrared quantum dots; The wavelength λ of light that can be identified by the fingerprint identification device (51) 51 >680nm.

2. The display screen with under-screen recognition function according to claim 1, It is characterized in that The energy of the light emitted by the infrared quantum dots accounts for 25%-50% of the energy of the light emitted by all the quantum dots in the first quantum dot light conversion film (30).

3. The display screen with under-screen recognition function according to claim 1, It is characterized in that The area of ​​the orthographic projection of the fingerprint receiving area in the identification layer (50) is smaller than or equal to the area of ​​the orthographic projection of the fingerprint identification device (51) in the identification layer (50).

4. The display screen with under-screen recognition function according to any one of claims 1 to 3, It is characterized in that The cover plate (11) has an optical layer (14), the optical layer (14) can achieve visible light transmission in the 380nm to 780nm band, the optical layer (14) has an opening (141), the opening (141) is located above the fingerprint recognition device (51), and the opening (141) at least partially overlaps with the orthographic projection of the fingerprint recognition device (51) on the display layer (10).

5. The display screen with under-screen recognition function according to any one of claims 1 to 3, It is characterized in that A second quantum dot light conversion film (52) is provided on the side of the fingerprint recognition device (51) facing the light source layer (40).

6. A display device, It is characterized in that A display screen with an under-screen recognition function comprising any one of claims 1 to 5.

Images