Display panel and display device

Abstract

The invention relates to the field of display, and particularly discloses a display panel and a display device.The display panel comprises a substrate, a packaging layer and a color resistance layer, and the packaging layer and the color resistance layer are arranged on the substrate in a stacked mode; the color resistance layer is divided into a fingerprint area, a plurality of color resistors are arranged in the fingerprint area at intervals, an ambient light sensor is arranged between every two adjacent color resistors, a fingerprint sensor is arranged at the position, corresponding to the ambient light sensor, in the packaging layer, and a conversion layer is arranged between the fingerprint sensor and the ambient light sensor. The conversion layer is used for converting visible light transmitted by the ambient light sensor into infrared light and irradiating the infrared light to the fingerprint sensor; an infrared light emitter is arranged below the fingerprint sensor, and infrared light emitted by the infrared light emitter passes through the fingerprint sensor and irradiates the fingerprint area through the conversion layer. In this way, under the condition that the size of a pixel display opening is not affected, the screen front face fingerprint recognition and light sensation detection functions are achieved at the same time.

Description

Technical Field

[0001] This application relates to the field of displays, and more particularly to a display panel and a display device. Background Technology

[0002] As users demand more diverse functions from display products, features such as fingerprint recognition and ambient light recognition have become essential functions for display products.

[0003] An ambient light sensor detects the intensity of light in the surrounding environment. It typically consists of a transistor and a photodiode; the transistor amplifies the current signal, while the photodiode converts light energy into a current signal. In-screen fingerprint sensors utilize the principles of light refraction and reflection. Light emitted from the screen illuminates the finger, and the reflected light passes through the sensor to identify the fingerprint image. However, integrating these sensing units within the display product while ensuring user access from the front of the screen undoubtedly impacts the pixel density of the display.

[0004] How to simultaneously achieve on-screen fingerprint recognition and light sensing without affecting the pixel aperture size has become a pressing issue in this field. Summary of the Invention

[0005] This application discloses a display panel and a display device, the purpose of which is to realize both front-facing fingerprint recognition and light sensing functions on the screen without affecting the pixel aperture size.

[0006] This application discloses a display panel, which includes a substrate and an encapsulation layer and a color resist layer stacked on the substrate. A fingerprint area is defined on the color resist layer, and multiple color resists are disposed within the fingerprint area, spaced apart. An ambient light sensor is disposed between two adjacent color resists. A fingerprint sensor is disposed within the encapsulation layer corresponding to the position of the ambient light sensor. A conversion layer is disposed between the fingerprint sensor and the ambient light sensor, converting visible light transmitted through the ambient light sensor into infrared light that illuminates the fingerprint sensor. An infrared light emitter is disposed below the fingerprint sensor, and the infrared light emitted by the emitter passes through the fingerprint sensor and the conversion layer to illuminate the fingerprint area.

[0007] Optionally, the ambient light sensor includes a photodiode, the conversion layer includes an infrared filter, and the photodiode corresponds to the position of the infrared filter; the infrared light emitter corresponds to the position of the photodiode.

[0008] Optionally, the fingerprint sensor includes an infrared detection unit and an infrared receiving unit; the infrared receiving unit is used to receive infrared light reflected by the finger above the fingerprint area, and the infrared detection unit is used to detect infrared light irradiated by the infrared emitter and infrared light filtered by the infrared filter. The infrared detection unit is positioned corresponding to the photodiode, and the orthogonal projection of the infrared filter on the substrate covers the orthogonal projection of the infrared receiving unit on the substrate.

[0009] Optionally, the number of infrared receiving units is greater than or equal to the number of infrared detection units, and the position of the infrared detection unit corresponds to the middle region of the photodiode, while the position of the infrared receiving unit corresponds to the edge region of the photodiode.

[0010] Optionally, the substrate includes a driving backplate, and the infrared light emitter is disposed within the driving backplate.

[0011] Optionally, a cathode layer, multiple light-emitting layers, and an anode layer are sequentially disposed below the encapsulation layer. The multiple light-emitting layers are spaced apart and located between the cathode layer and the anode layer. The infrared emitter is disposed between two adjacent light-emitting layers.

[0012] Optionally, the infrared emitter includes an infrared organic light-emitting layer, one side of which is connected to the cathode layer; a second electrode is disposed below the organic light-emitting layer, the second electrode being disposed in the same layer as the anode layer and disconnected from the anode layer; the other side of the infrared organic light-emitting layer is connected to the second electrode; when the cathode layer and the second electrode apply a first preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer emits infrared light; when the cathode layer and the second electrode apply a second preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer does not emit light.

[0013] Optionally, the anode layer includes a plurality of spaced anodes, each anode including a main body and an extension, the extension being connected to the main body; the main body corresponds to the position of the light-emitting layer, and the orthographic projection of the main body on the substrate covers the orthographic projection of the light-emitting layer on the substrate; the extension corresponds to the position of the photodiode, and the orthographic projection of the photodiode on the substrate covers the orthographic projection of the extension on the substrate; there is a preset distance between the extensions of two adjacent anodes; the infrared organic light-emitting layer is disposed on the extension and is connected to the cathode layer and the extension respectively; when the cathode layer and the extension apply a first preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer emits infrared light; when the cathode layer and the extension apply a second preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer does not emit light.

[0014] Optionally, the infrared organic light-emitting layer is made of one or more materials selected from gallium arsenide, aluminum gallium arsenide, benzodiazepine, and cyanine dye.

[0015] This application also discloses a display device, including a rear shell, and the display device further includes the aforementioned display panel, which is disposed within the rear shell.

[0016] This application improves upon traditional display panels by placing the ambient light sensor between two adjacent color resists in the position originally used for light blocking within the black matrix. This way, the ambient light sensor does not obstruct the normal light emission path of the display panel, thus not affecting the pixel display aperture size. Furthermore, the ambient light sensor can still receive visible light from the external environment for ambient light detection. In addition, a fingerprint area is located on the front of the screen, with a conversion layer and fingerprint sensor positioned below the ambient light sensor. When visible light from the outside shines on the ambient light sensor, some of the visible light passes through the sensor and reaches the conversion layer. The conversion layer converts the transmitted visible light into infrared light, which can then be used for fingerprint detection. The infrared light emitted by the infrared emitter is transmitted through the conversion layer to the fingerprint sensor below, ensuring that the light between the conversion layer and the fingerprint sensor is primarily infrared, thus reducing interference from ambient light on fingerprint recognition. When fingerprint recognition is required, the finger is placed in the fingerprint area. The infrared light is transmitted through the conversion layer to the fingerprint area, and then reflected back into the conversion layer by the finger. This light is then received by the fingerprint sensor below, thus achieving fingerprint recognition. In other words, this application spatially superimposes the fingerprint sensor and ambient light sensor on the film layer, integrating fingerprint recognition and light sensing functions without occupying additional display opening area on the display panel. This allows for simultaneous front-facing fingerprint recognition and light sensing without affecting the pixel opening size, improving the functionality and display effect of the display panel. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They serve to demonstrate implementation methods of this application and, together with the textual description, explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of the first embodiment of the display panel of this application; Figure 2 This is a schematic diagram of a second embodiment of the display panel of this application; Figure 3 This is a schematic diagram of a third embodiment of the display panel of this application; Figure 4 This is a schematic diagram of an embodiment of the display device of this application.

[0018] Among them, 10 is a display device; 100 is a display panel; 200 is a back cover; 110 is a substrate; 120 is an encapsulation layer; 130 is a color resist layer; 131 is a color resist; 140 is a fingerprint area; 150 is an ambient light sensor; 151 is a photodiode; 160 is a conversion layer; 161 is an infrared filter; 170 is a fingerprint sensor; 171 is an infrared detection unit; 172 is an infrared receiving unit; 180 is a driving backplate; 190 is a cathode layer; 300 is an anode layer; 310 is an anode; 311 is a main body; 312 is an extension; 320 is a light-emitting layer; 330 is an infrared light emitter; 331 is an infrared organic light-emitting layer; and 340 is a second electrode. Detailed Implementation

[0019] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0020] Figure 1 This is a schematic diagram of the first embodiment of the display panel of this application, as shown below. Figure 1 As shown in the figure, this application discloses a display panel 100, which includes a substrate 110, and an encapsulation layer 120 and a color resist layer 130 stacked on the substrate 110. A fingerprint area 140 is divided on the color resist layer 130, and a plurality of color resists 131 are disposed in the fingerprint area 140. The plurality of color resists 131 are spaced apart, and an ambient light sensor 150 is disposed between two adjacent color resists 131. A fingerprint sensor 170 is disposed in the encapsulation layer 120 at the position corresponding to the ambient light sensor 150. A conversion layer 160 is disposed between the fingerprint sensor 170 and the ambient light sensor 150. The conversion layer 160 is used to convert the visible light transmitted by the ambient light sensor 150 into infrared light to illuminate the fingerprint sensor 170. An infrared light emitter 330 is disposed below the fingerprint sensor 170. The infrared light emitted by the infrared light emitter 330 passes through the fingerprint sensor 170 and the conversion layer 160 to illuminate the fingerprint area 140.

[0021] This application improves upon traditional display panels by placing the ambient light sensor 150 between two adjacent color resists 131 in the black matrix position originally used for light blocking. This way, the ambient light sensor 150 does not obstruct the normal light emission path of the display panel 100, thus not affecting the pixel display aperture size of the display panel 100. Furthermore, the ambient light sensor 150 can normally receive visible light from the external environment to achieve ambient light detection. In addition, a fingerprint area 140 is provided on the front of the screen, and a conversion layer 160 and a fingerprint sensor 170 are located below the ambient light sensor 150. When visible light from the outside shines on the ambient light sensor 150, some of the visible light passes through the ambient light sensor 150 and reaches the conversion layer 160. The conversion layer 160 converts the transmitted visible light into infrared light, which can then be used for... The light emitted by the infrared emitter 330 is transmitted through the conversion layer 160 to the fingerprint sensor 170, ensuring that the light between the conversion layer 160 and the fingerprint sensor 170 is primarily infrared, thereby reducing the interference of ambient light on fingerprint recognition. When fingerprint recognition is required, the finger is placed in the fingerprint area 140. The infrared light emitted by the infrared emitter 330 passes through the conversion layer 160 and illuminates the fingerprint area 140. The infrared light illuminating the fingerprint area 140 is reflected by the finger and re-enters the conversion layer 160, and is then received by the fingerprint sensor 170 below, thus realizing the fingerprint recognition function. In other words, through the above design, the fingerprint sensor 170 and the ambient light sensor 150 are spatially superimposed on the film layer, achieving the integration of fingerprint recognition and light sensing functions without additionally occupying the display opening area of ​​the display panel 100. This allows for the simultaneous realization of front-facing fingerprint recognition and light sensing functions without affecting the pixel opening size, which is beneficial to improving the functionality and display effect of the display panel 100.

[0022] It should be noted that the display panel 100 in this application is mainly an OLED (Organic Light-Emitting Diode) display panel 100. In the traditional manufacturing of OLED display panels, maskless deposition and photolithography are often used to pattern pixels, which can effectively replace the evaporation process. To achieve high resolution and colorization in passive matrix OLEDs and better address issues such as low cathode template resolution and low device yield, an isolation pillar structure is introduced in actual fabrication. This involves creating insulating partitions (isolation pillars) on the substrate before depositing the organic thin film and metal cathode, instead of using a metal template, to separate different pixels and create a pixel array. COE (Color film on Encapsulation) is a new technology that replaces circular polarizers. After AMOLED thin-film encapsulation—that is, after forming an encapsulation layer above the light-emitting layer—a color filter process is performed on the encapsulation layer. R / G / B color filters (forming color resist layers) are deposited on the R / G / B pixels, filtering the light. The black matrix, located between adjacent color resist layers, absorbs edge light and prevents color mixing.

[0023] This application improves upon the COE architecture display panel 100 by placing the ambient light sensor 150 in the original position of the black matrix in the color resist layer 130, and placing the fingerprint area 140 on the front of the display panel. A conversion layer 160 and a fingerprint sensor 170 are respectively placed below the ambient light sensor 150, thus integrating both the ambient light sensor 150 and the fingerprint sensor 170 into the non-transparent area of ​​the display panel 100. This reduces the impact on the aperture ratio of the display panel 100, ensuring the display effect of the display panel 100 while maintaining high integration. Furthermore, through this design, the light illuminating the ambient light sensor 150 from the external environment can be utilized by the fingerprint sensor 170, helping to improve light utilization. In addition, by using an infrared light emitter 330 to illuminate the fingerprint sensor 170 from below, infrared light is emitted from the front of the display panel 100 and illuminates the finger, ensuring that the user can use the fingerprint recognition function on the front of the screen.

[0024] Specifically, the ambient light sensor 150 includes a photodiode 151, the conversion layer 160 includes an infrared filter 161, and the photodiode 151 and the infrared filter 161 are positioned correspondingly; the infrared light emitter 330 is positioned correspondingly to the photodiode 151.

[0025] Since the photodiode 151 is the core component of the ambient light sensor 150, its main function is to convert the light signal illuminating the photodiode 151 into an electrical signal. Placing the photodiode 151 between adjacent color resistors 131 can ensure that the photodiode 151 receives sufficient ambient light, thereby providing more accurate ambient light detection. On the other hand, it can also ensure that the photodiode 151 does not easily block the opening area of ​​the display panel 100, thus affecting the display effect of the display panel 100.

[0026] The main functions of the conversion layer 160 are: on the one hand, to convert the visible light transmitted through the photodiode 151 into infrared light so that the infrared light can illuminate the fingerprint sensor 170 for fingerprint recognition, ensuring that the area between the conversion layer 160 and the fingerprint sensor 170 is mainly infrared light, thereby reducing the interference of ambient light on fingerprint recognition; on the other hand, to filter out the visible light emanating from the light-emitting layer 320 towards the photodiode 151, thereby reducing the interference of visible light emitted from inside the display panel 100 on the ambient light sensor 150, and to a certain extent playing a role similar to a "black matrix" for light blocking, ensuring the display effect.

[0027] The conversion layer 160 can be an infrared filter 161 or an infrared filter film. The infrared filter 161 is a special filter whose structure separates visible light and infrared light, allowing only infrared light to pass through. Its principle is based on the fact that infrared light does not have the characteristics of visible light. Visible light is reflected in the infrared filter 161, while infrared light can pass through it. The infrared filter 161 is usually made of optical glass or colored adhesive. For example, when the infrared filter 161 is made of colored adhesive, the structure of the colored adhesive is usually composed of gelatin and dye, which can filter out all visible light and ultraviolet light, and has a good filtering effect.

[0028] Infrared filter 161 can be made using vacuum coating technology, such as coating on optical white glass. This type of filter is called an optical cold mirror, which reflects visible light and allows infrared light to pass through.

[0029] Since the position of the infrared filter 161 corresponds to the position of the photodiode 151, when visible light passes through the photodiode 151, some of the light can directly reach the infrared filter 161. The infrared filter 161 converts this visible light into infrared light, which is then received by the fingerprint sensor 170 below for fingerprint recognition, thus improving the sensitivity of fingerprint recognition.

[0030] It is worth noting that, due to the setting of the infrared filter 161, the visible light emitted by the light-emitting layer 320 below the encapsulation layer 120 in the display panel 100 and directed toward the photodiode 151 is also filtered after passing through the infrared filter 161. Only infrared light passes through the infrared filter 161, so that the photodiode 151 is not interfered with by the visible light irradiated by the light-emitting layer 320. This is beneficial to improving the accuracy of the photodiode 151 in detecting ambient light. At the same time, it can also ensure that the light reaching the fingerprint area 140 of the finger is mainly infrared light, reducing the interference of other light, which is beneficial to improving the detection accuracy of the fingerprint sensor 170.

[0031] The infrared light emitter 330 is also positioned in relation to the photodiode 151, so that the infrared light emitted by the infrared light emitter 330 can directly illuminate the photodiode 151, reducing infrared light loss, and reaching the fingerprint area 140 above through the photodiode 151, ensuring that sufficient infrared light illuminates the finger in the fingerprint area 140, thus providing a guarantee for improving the accuracy of fingerprint sensor 170 in the future.

[0032] Furthermore, since the photodiode 151 and the infrared filter 161 are positioned correspondingly between the two adjacent color resistors 131 where the black matrix was originally set, and the infrared light emitter 330 is positioned correspondingly to the photodiode 151, the three form a vertical arrangement relative to the substrate 110. This allows the photodiode 151 and the infrared filter 161 to overlap in space without affecting the normal light output of the display panel 100, effectively reducing the area occupied by the photodiode 151 and the infrared filter 161 in the display panel 100, which is beneficial to improving the space utilization of the display panel 100.

[0033] Specifically, the substrate 110 includes a driving backplate 180, and an infrared light emitter 330 is disposed within the driving backplate 180.

[0034] In this embodiment, by integrating the infrared light emitter 330 into the drive backplane 180 and electrically connecting it to the drive circuit within the drive backplane 180, the internal circuit of the drive backplane 180 provides an electrical signal to the infrared light emitter 330 to control the infrared light emitter 330 to emit or turn off infrared light; thus, the infrared light emission function can be realized without adding too much process complexity.

[0035] Furthermore, the fingerprint sensor 170 includes an infrared detection unit 171 and an infrared receiving unit 172; the infrared receiving unit 172 is used to receive infrared light reflected from the finger above the fingerprint area 140, and the infrared detection unit 171 is used to detect infrared light irradiated by the infrared light emitter 330 and infrared light filtered by the infrared filter 161. The infrared detection unit 171 is positioned corresponding to the photodiode 151, and the orthogonal projection of the infrared filter 161 on the substrate 110 covers the orthogonal projection of the infrared receiving unit 172 on the substrate 110.

[0036] In the actual fingerprint recognition process, the infrared light emitted by the infrared light emitter 330 from below the fingerprint sensor 170 passes through the gap between the infrared detection unit 171 and the infrared receiving unit 172 and shines upward onto the infrared filter 161. The infrared filter 161 then shines onto the fingerprint area 140. When a finger is placed on the fingerprint area 140, the surface of the finger reflects the infrared light. The reflected infrared light re-enters the conversion layer 160 and then shines onto the infrared receiving unit 172 through the infrared filter 161. This portion of the infrared light fed back by the finger is captured by the infrared receiving unit 172. The infrared receiving unit 172 converts the received infrared light signal into an electrical signal, etc., for subsequent processing and analysis to obtain fingerprint information, etc. This realizes the fingerprint recognition function on the front of the display panel 100.

[0037] The selective transmittance of the infrared filter 161 ensures the consistency between the infrared light illuminating the fingerprint area 140 and the infrared light captured by the infrared receiving unit 172, without interference from other light sources, which helps improve the reception accuracy of the infrared receiving unit 172.

[0038] The light-emitting layer 320 inside the display panel 100 emits light containing various wavelengths of light, including infrared light. The light shines on the infrared filter 161, which allows a certain wavelength of infrared light to pass through while filtering out other wavelengths of visible light. Therefore, it will not interfere with the ambient light sensor 150 above, ensuring the accuracy of the detection results of the ambient light sensor 150. At the same time, it can also be used to replace the light-shielding function of the traditional black matrix.

[0039] It should be noted that the ridges and grooves of the fingerprint area 140 have different infrared light reflection characteristics. The ridges are relatively more prominent, and the intensity and direction of the reflected light will differ from those of the grooves. This difference will cause the reflected infrared light to carry the fingerprint pattern information, which can then be captured by the infrared receiving unit 172, providing a basis for fingerprint recognition.

[0040] Because fingerprints have an uneven texture, infrared light reflected from them at different angles and intensities will be generated depending on the shape of the fingerprint ridges. When multiple infrared receiving units 172 are provided, they can receive reflected infrared light from different positions. By comparing the intensity, timing, and other characteristics of the infrared light signals received by different infrared receiving units 172, information about different positions of the fingerprint can be obtained.

[0041] The infrared detection unit 171 is positioned corresponding to the photodiode 151 to ensure that the visible light transmitted from the photodiode 151, after passing through the infrared filter 161, can be directly irradiated onto the infrared detection unit 171 and captured directly by the infrared detection unit 171. This helps to improve the detection sensitivity of the infrared detection unit 171.

[0042] Furthermore, the orthographic projection of the infrared filter 161 on the substrate 110 covers the orthographic projection of the infrared receiving unit 172 on the substrate 110, so that the infrared filter 161 covers the infrared receiving unit 172. In this way, the infrared light transmitted through the infrared filter 161 can better cover the area where the infrared receiving unit 172 is located. When the infrared light is reflected by the finger, it can also be better received by the infrared receiving unit 172, which helps to improve the accuracy of fingerprint information.

[0043] Since the infrared receiving unit 172 in the fingerprint sensor 170 mainly receives the infrared light reflected from the finger to obtain fingerprint information from different positions of the finger, the more infrared light reflected from the finger the infrared receiving unit 172 can receive, the more accurate the fingerprint information will be, and the higher the sensitivity of fingerprint recognition will be. Based on this, this application has designed the number and arrangement of the infrared receiving unit 172 and the infrared detection unit 171, as follows: The number of infrared receiving units 172 is greater than or equal to the number of infrared detection units 171, and the position of the infrared detection unit 171 corresponds to the middle region of the photodiode 151, while the position of the infrared receiving unit 172 corresponds to the edge region of the photodiode 151.

[0044] In this embodiment, when the number of infrared receiving units 172 is equal to the number of infrared detection units 171, the infrared light transmitted from the infrared filter 161 can be detected better, and the infrared light reflected from the finger can be captured, thereby forming a better fingerprint recognition.

[0045] When the number of infrared receiving units 172 is greater than the number of infrared detection units 171, since each infrared receiving unit 172 can independently receive the infrared light signal reflected by the finger, more infrared receiving units 172 can capture the infrared light reflected by the finger at the same time, thus forming more fingerprint details.

[0046] Furthermore, the infrared detection unit 171 can be arranged in the middle region of the corresponding photodiode 151 to ensure that the infrared light transmitted through the infrared filter 161 after the ambient light shines on it, as well as the infrared light emitted by the infrared light emitter 330, can be effectively detected by the infrared detection unit 171, thus ensuring the timeliness of detection.

[0047] Multiple infrared receiving units 172 can be arranged at the edge region of the photodiode 151, thus effectively receiving the infrared light transmitted through the edge region of the photodiode 151, reducing the infrared light lost at the edge, and minimizing recognition errors caused by different finger placement angles, thereby improving the accuracy of fingerprint recognition. Furthermore, if one infrared receiving unit 172 is affected by external interference or temporarily malfunctions, the other infrared receiving units 172 can still function normally, thereby improving the reliability of fingerprint recognition.

[0048] Furthermore, in this embodiment, a photodiode 151 is disposed between two adjacent color resistors 131, and an infrared filter 161 is disposed within the encapsulation layer 120, and the infrared filter 161 is made of black material; the orthogonal projection area of ​​the infrared filter 161 on the substrate 110 is greater than or equal to the orthogonal projection area of ​​the photodiode 151 on the substrate 110.

[0049] By placing the photodiode 151 in the black matrix position that was originally used for light blocking between two adjacent color resistors 131, the photodiode 151 will not block the normal light emission path of the display panel 100, thus not affecting the size of the pixel display opening of the display panel 100, and the photodiode 151 can normally receive visible light from the external environment to realize ambient light detection.

[0050] In this embodiment, the position originally intended for the black matrix is ​​occupied by the photodiode 151. Therefore, to prevent light emitted from the light-emitting layer 320 below the encapsulation layer 120 of the display panel 100 from directly illuminating the photodiode 151 between two adjacent color resistors 131, thus affecting the detection accuracy of the ambient light sensor 150 and the display effect of the display panel 100, this application also improves the infrared filter 161 by using a black material. The black infrared filter 161 can replace the original black matrix between the two color resistors 131, effectively absorbing unnecessary visible light and other wavelengths of light, reducing light interference.

[0051] Furthermore, the projected area of ​​the infrared filter 161 on the substrate 110 is greater than or equal to the projected area of ​​the photodiode 151 on the substrate 110, so that the infrared filter 161 can cover the photodiode 151 in a direction perpendicular to the substrate 110. In this way, when visible light passes through the photodiode 151, the transmitted visible light can be received by the infrared filter 161, and the infrared filter 161 converts the visible light into infrared light, so that the fingerprint sensor 170 can receive enough infrared light, thereby ensuring the sensitivity of the fingerprint sensor 170.

[0052] Figure 2 This is a schematic diagram of a second embodiment of the display panel of this application, as shown below. Figure 2 As shown, a cathode layer 190, multiple light-emitting layers 320 and an anode layer 300 are sequentially arranged below the encapsulation layer 120. The multiple light-emitting layers 320 are spaced apart and located between the cathode layer 190 and the anode layer 300. An infrared light emitter 330 is arranged between two adjacent light-emitting layers 320.

[0053] The difference between this embodiment and the previous embodiment is that this embodiment has made an improvement to the infrared light emitter 330, and the infrared light emitter 330 is placed between two adjacent light-emitting layers 320 inside the drive back plate 180.

[0054] Because the light-emitting layer 320 is positioned closer to the photodiode 151, the distance between the infrared light emitter 330 and the light strip diode is shortened. This allows the infrared light emitter 330 to emit infrared light relatively close to the photodiode 151, further shortening the infrared light propagation path and effectively reducing potential light loss within the internal structure of the display panel 100. This ensures that sufficient infrared light can pass through the photodiode 151 and reach the fingerprint area 140. Simultaneously, integrating the infrared light emitter 330 between adjacent light-emitting layers 320 fully utilizes the original gap space within the display panel 100, further optimizing the internal spatial layout of the display panel 100 without increasing its thickness.

[0055] Specifically, the infrared light emitter 330 includes an infrared organic light-emitting layer 331, one side of which is connected to the cathode layer 190; a second electrode 340 is disposed below the organic light-emitting layer 320, the second electrode 340 is disposed in the same layer as the anode layer 300, and is disconnected from the anode layer 300; the other side of the infrared organic light-emitting layer 331 is connected to the second electrode 340. When the cathode layer 190 and the second electrode 340 apply a first preset voltage to both ends of the infrared organic light-emitting layer 331, the infrared organic light-emitting layer 331 emits infrared light; when the cathode layer 190 and the second electrode 340 apply a second preset voltage to both ends of the infrared organic light-emitting layer 331, the infrared organic light-emitting layer 331 does not emit light.

[0056] The specific values ​​of the first preset voltage and the second preset voltage can be flexibly adjusted according to the material properties of the infrared organic light-emitting layer 331 and the driving requirements.

[0057] Since the infrared organic light-emitting layer 331 in this embodiment is made of infrared light-emitting material, and the excitation voltage of infrared light-emitting material needs to be 8V, while the excitation voltage of visible light material is above 2V, the excitation voltage of visible light can be controlled to be below 7V. Based on this, the first preset voltage in this embodiment can be 8V, and the second preset voltage can be 6V.

[0058] When fingerprint recognition is required, the driving circuit applies a first preset voltage to the cathode layer 190 and the second electrode 340. The infrared organic light-emitting layer 331 is excited to emit infrared light. The infrared light passes upward through the upper encapsulation layer 120, the infrared filter 161 and the photodiode 151, and finally illuminates the finger located in the fingerprint area 140. After the feedback from the finger, it re-enters the infrared filter 161 and illuminates the fingerprint sensor 170, thereby realizing the fingerprint recognition function.

[0059] In non-fingerprint recognition mode, such as during ambient light recognition or normal display, a second preset voltage is applied, and the infrared organic light-emitting layer 331 stops emitting light, avoiding unnecessary power consumption and effectively improving the energy utilization efficiency of the display panel 100.

[0060] In this embodiment, the infrared organic light-emitting layer 331 is made of one or more materials selected from gallium arsenide, aluminum gallium arsenide, benzodiazepine, and cyanine dye. By selecting the above materials, it can be ensured that the infrared organic light-emitting layer 331 stably and efficiently emits infrared light of a specific wavelength when a first preset voltage is applied, thus meeting the light source requirements of fingerprint recognition.

[0061] Figure 3 This is a schematic diagram of a third embodiment of the display panel of this application, as shown. Figure 3As shown, the anode layer 300 includes a plurality of anodes 310 spaced apart. Each anode 310 includes a main body portion 311 and an extension portion 312, the extension portion 312 being connected to the main body portion 311. The main body portion 311 corresponds to the position of the light-emitting layer 320, and the orthogonal projection of the main body portion 311 on the substrate 110 covers the orthogonal projection of the light-emitting layer 320 on the substrate 110. The extension portion 312 corresponds to the position of the photodiode 151, and the orthogonal projection of the photodiode 151 on the substrate 110 covers the orthogonal projection of the extension portion 312 on the substrate 110. The orthographic projection on plate 110; there is a preset distance between the extensions 312 of two adjacent anodes 310; an infrared organic light-emitting layer 331 is disposed on the extension 312 and is connected to the cathode layer 190 and the extension 312 respectively; when the cathode layer 190 and the extension 312 apply a first preset voltage to both ends of the infrared organic light-emitting layer 331, the infrared organic light-emitting layer 331 emits infrared light; when the cathode layer 190 and the extension 312 apply a second preset voltage to both ends of the infrared organic light-emitting layer 331, the infrared organic light-emitting layer 331 does not emit light.

[0062] The difference between this embodiment and the previous embodiment is that in this embodiment, the infrared organic light-emitting layer 331 is not disposed between two adjacent light-emitting layers 320, but is directly disposed on the extension portion 312 of the anode 310. The main body portion 311 of the anode 310 drives the light-emitting layer 320 to achieve normal display function, while the extension portion 312 extends from the main body portion 311 to the position corresponding to the photodiode 151, and works with the cathode layer 190 to provide voltage to the infrared organic light-emitting layer 331.

[0063] The extension 312 corresponds to the position of the photodiode 151, and the orthogonal projection of the photodiode 151 on the substrate 110 covers the orthogonal projection of the extension 312, so that the infrared light emitted by the infrared organic light-emitting layer 331 on the extension 312 can be guided to the photodiode 151 more directly and in a more concentrated manner, thereby reducing unnecessary loss of infrared light during transmission.

[0064] When fingerprint recognition is required, the driving circuit controls the extension 312 of the cathode layer 190 and the anode 310 to apply a first preset voltage (e.g., 8V) to the infrared organic light-emitting layer 331. At this time, the infrared organic light-emitting layer 331 is stimulated to emit infrared light, which illuminates the fingerprint area 140. After being fed back by the finger in the fingerprint area 140, the subsequent fingerprint recognition function is triggered.

[0065] In non-fingerprint recognition mode, a second preset voltage (e.g., 6V) is applied to stop the light from illuminating, thereby reducing the power consumption of the display panel 100.

[0066] In this embodiment, the infrared organic light-emitting layer 331 occupies a small area, resulting in a slight difference in infrared light intensity between the edge and the center. Therefore, an infrared detection unit 171 can be set up using two pixel gaps (between R and G) to detect infrared light intensity at different edge locations. Infrared receiving units 172 are set up at other pixel gaps (between G and B, or between R and G, or between R and B) to receive infrared light reflected back from the finger. That is, the infrared detection unit 171 and the infrared receiving unit 172 are not concentrated in the same area. Furthermore, the number of infrared receiving units 172 in the entire fingerprint area 140 should be much greater than the number of infrared detection units 171. This allows for the capture of reflected infrared light signals from multiple locations and angles within the fingerprint area 140, thereby further improving the accuracy of fingerprint information extraction.

[0067] Figure 4 This is a schematic diagram of an embodiment of the display device of this application, as shown below. Figure 4 As shown in the illustration, this application also discloses a display device 10, including a rear shell 200. The display device 10 further includes the aforementioned display panel 100, which is disposed within the rear shell 200. The rear shell 200 can effectively protect the display panel 100 from damage by external forces and can, to a certain extent, prevent moisture, dust, and other substances from the external environment from entering the interior of the display panel 100 and causing corrosion, thereby helping to extend the service life of the display device 10.

[0068] In a traditional display device 10, if the fingerprint recognition function and the ambient light detection function are integrated into the display panel 100 of the display device 10, it is easy to obstruct the pixel display area of ​​the display panel 100, thereby affecting the display effect.

[0069] This application improves upon the display panel 100 of a conventional display device 10 by placing the ambient light sensor 150 between two adjacent color resists 131 in the original black matrix position used for light blocking. This way, the ambient light sensor 150 does not obstruct the normal light emission path of the display panel 100, thus not affecting the pixel display aperture size of the display panel 100. Furthermore, the ambient light sensor 150 can normally receive visible light from the external environment to achieve ambient light detection. In addition, a fingerprint area 140 is provided on the front of the screen, and a conversion layer 160 and a fingerprint sensor 170 are provided below the ambient light sensor 150. When visible light from the outside shines on the ambient light sensor 150, some of the visible light passes through the ambient light sensor 150 and reaches the conversion layer 160. The conversion layer 160 converts the transmitted visible light into infrared light. The infrared light can be utilized by the fingerprint sensor 170 below, ensuring that the area between the conversion layer 160 and the fingerprint sensor 170 is primarily infrared light, thereby reducing interference from ambient light on fingerprint recognition. When fingerprint recognition is required, the finger is placed in the fingerprint area 140. The infrared light emitted by the infrared light emitter 330 passes through the conversion layer 160 and illuminates the fingerprint area 140. The infrared light illuminating the fingerprint area 140 is reflected by the finger and re-enters the conversion layer 160, then passes through the conversion layer 160 and is received by the fingerprint sensor 170 below, thus realizing the fingerprint recognition function. In other words, through the above design, the fingerprint sensor 170 and the ambient light sensor 150 are spatially superimposed on the film layer, achieving the integration of fingerprint recognition and light sensing functions without additionally occupying the display opening area of ​​the display panel 100. This allows for the simultaneous realization of front-facing fingerprint recognition and light sensing functions without affecting the pixel opening size, which is beneficial to improving the functionality and display effect of the display panel 100, thereby enhancing the functionality of the display device 10.

[0070] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0071] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A display panel, the display panel comprising a substrate, and an encapsulation layer and a color resist layer stacked on the substrate; Its features are, The color resist layer is divided into a fingerprint area, and multiple color resists are disposed in the fingerprint area. The multiple color resists are spaced apart, and an ambient light sensor is disposed between two adjacent color resists. A fingerprint sensor is disposed in the encapsulation layer corresponding to the position of the ambient light sensor. A conversion layer is disposed between the fingerprint sensor and the ambient light sensor. The conversion layer is used to convert the visible light transmitted by the ambient light sensor into infrared light to illuminate the fingerprint sensor. An infrared light emitter is disposed below the fingerprint sensor. The infrared light emitted by the infrared light emitter passes through the fingerprint sensor and the conversion layer to illuminate the fingerprint area.

2. The display panel as described in claim 1, characterized in that, The ambient light sensor includes a photodiode, the conversion layer includes an infrared filter, and the photodiode and the infrared filter are positioned correspondingly; the infrared light emitter is positioned correspondingly to the photodiode.

3. The display panel as described in claim 2, characterized in that, The fingerprint sensor includes an infrared detection unit and an infrared receiving unit; The infrared receiving unit is used to receive infrared light reflected by the finger above the fingerprint area, and the infrared detection unit is used to detect infrared light irradiated by the infrared emitter and infrared light filtered by the infrared filter. The infrared detection unit is positioned corresponding to the photodiode, and the orthogonal projection of the infrared filter on the substrate covers the orthogonal projection of the infrared receiving unit on the substrate.

4. The display panel as described in claim 3, characterized in that, The number of infrared receiving units is greater than or equal to the number of infrared detection units, and the position of the infrared detection unit corresponds to the middle region of the photodiode, while the position of the infrared receiving unit corresponds to the edge region of the photodiode.

5. The display panel as described in claim 4, characterized in that, The substrate includes a driving backplate, and the infrared light emitter is disposed within the driving backplate.

6. The display panel as described in claim 4, characterized in that, Below the encapsulation layer, a cathode layer, multiple light-emitting layers, and an anode layer are sequentially arranged. The multiple light-emitting layers are spaced apart and located between the cathode layer and the anode layer. The infrared emitter is disposed between two adjacent light-emitting layers.

7. The display panel as described in claim 6, characterized in that, The infrared emitter includes an infrared organic light-emitting layer, one side of which is connected to the cathode layer; A second electrode is disposed below the infrared organic light-emitting layer, the second electrode being disposed in the same layer as the anode layer but disconnected from it; the other side of the infrared organic light-emitting layer is connected to the second electrode. When the cathode layer and the second electrode apply a first preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer emits infrared light. When the cathode layer and the second electrode apply a second preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer does not emit light.

8. The display panel as described in claim 6, characterized in that, The anode layer includes a plurality of anodes spaced apart, each anode including a main body and an extension, the extension being connected to the main body; the main body corresponds to the position of the light-emitting layer, and the orthographic projection of the main body on the substrate covers the orthographic projection of the light-emitting layer on the substrate; The extension corresponds to the position of the photodiode, and the orthographic projection of the photodiode on the substrate covers the orthographic projection of the extension on the substrate; there is a preset distance between the extensions of two adjacent anodes; The infrared organic light-emitting layer is disposed on the extension and is connected to the cathode layer and the extension, respectively; When the cathode layer and the extension apply a first preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer emits infrared light. When the cathode layer and the extension apply a second preset voltage to both ends of the infrared organic light-emitting layer, the infrared organic light-emitting layer does not emit light.

9. The display panel as described in claim 7 or 8, characterized in that, The infrared organic light-emitting layer is made of one or more materials selected from gallium arsenide, aluminum gallium arsenide, benzodiazepine, and cyanine dye.

10. A display device, comprising a rear cover, characterized in that, The display device further includes a display panel as described in any one of claims 1 to 9, the display panel being disposed within the rear housing.

Images