CN109541839B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN109541839B CN109541839B CN201811502534.9A CN201811502534A CN109541839B CN 109541839 B CN109541839 B CN 109541839B CN 201811502534 A CN201811502534 A CN 201811502534A CN 109541839 B CN109541839 B CN 109541839B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
Abstract
The invention discloses a display panel and a display device, wherein the light receiving surface of a photosensitive element faces a substrate, so that external environment light can be prevented from being incident on the light receiving surface of the photosensitive element through a protective substrate. The light receiving surface and the upper surface of the substrate have a predetermined angle therebetween, so that the normal line of the light receiving surface and the reflective layer have an intersection at the angle. When a finger touches the display panel, light reflected by the finger and entering the display panel is incident on the reflecting layer, and light is incident on the light receiving surface of the light sensing element in a form of right angle as much as possible by the reflection action of the reflecting layer, so that the energy of the light incident on the light receiving surface of the light sensing element can be increased as much as possible, and the fingerprint identification accuracy is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
With the rapid development of technology, mobile products with biometric identification function gradually come into the lives of people. The fingerprint is a characteristic which is unique and unique to the human body and distinguishable from other people, and is composed of a series of valleys and ridges on the surface of the skin at the finger tip, the composition details of which usually include the branches of the ridges, the ends of the ridges, the arches, the tent-like arches, the left-handed, right-handed, spiral, or double-handed details, which determine the unique characteristics of the fingerprint and therefore have received much attention. At present, people adopt an external hanging type to integrate a fingerprint identification structure into a mobile product, and the core of attention of people in the future is to apply a fingerprint identification technology in a display panel so as to realize a fingerprint identification function.
Therefore, how to integrate the fingerprint identification structure into the display panel to realize the fingerprint identification function is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for integrating a fingerprint identification structure into the display panel so as to realize a fingerprint identification function.
An embodiment of the present invention provides a display panel, including: the substrate comprises a substrate base plate, a plurality of photosensitive elements and a reflecting layer, wherein the plurality of photosensitive elements and the reflecting layer are positioned on the substrate base plate; the reflecting layer is positioned between the layer where the photosensitive element is positioned and the substrate base plate;
the light receiving surface of the photosensitive element faces the substrate base plate, and a set included angle is formed between the light receiving surface and the upper surface of the substrate base plate; the included angle enables a normal line of the light receiving surface to have an intersection point with the reflecting layer.
Correspondingly, the embodiment of the invention also provides a display device which comprises the display panel provided by the embodiment of the invention.
The invention has the following beneficial effects:
according to the display panel and the display device provided by the embodiment of the invention, the light receiving surface of the photosensitive element faces the substrate, so that external environment light can be prevented from being incident on the light receiving surface of the photosensitive element through the protective substrate. The light receiving surface and the upper surface of the substrate have a predetermined angle therebetween, so that the normal line of the light receiving surface and the reflective layer have an intersection at the angle. When a finger touches the display panel, light reflected by the finger and entering the display panel is incident on the reflecting layer, and light is incident on the light receiving surface of the light sensing element in a form of right angle as much as possible by the reflection action of the reflecting layer, so that the energy of the light incident on the light receiving surface of the light sensing element can be increased as much as possible, and the fingerprint identification accuracy is improved.
Drawings
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the display panel shown in FIG. 1 along the direction AA';
FIG. 3 is a second schematic cross-sectional view of the display panel shown in FIG. 1 along the AA';
FIG. 4 is a schematic cross-sectional view of a reflective layer according to an embodiment of the present invention;
FIG. 5 is a third schematic cross-sectional view of the display panel shown in FIG. 1 along the AA';
fig. 6 is a second schematic top view of a display panel according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of the display panel shown in FIG. 6 along the direction AA';
FIG. 8 is a second schematic cross-sectional view of the display panel shown in FIG. 6 along the AA';
fig. 9 is a second schematic top view of a display panel according to an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of the display panel shown in FIG. 9 along the AA';
FIG. 11 is a schematic cross-sectional view of the display panel shown in FIG. 9 along the direction BB';
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a display panel and a display device according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that the thickness and shape of the respective layers in the drawings do not reflect the true scale of the display panel, and are only for the purpose of schematically illustrating the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
In order to realize the fingerprint identification function, a photosensitive element capable of receiving light is required to be arranged. Generally, the light receiving surface of the light sensing element is disposed to face the light emitting side of the display panel, so that when a finger touches the display panel, the light reflected by the finger and entering the display panel can be received by the light receiving surface of the light sensing element. However, since the external ambient light also enters the display panel, the photosensitive element also receives the external ambient light, which results in inaccurate fingerprint recognition. When the light sensing element is disposed inside the display panel, light is reflected and passes through the plurality of film layers to reach the light receiving surface of the light sensing element, so that the energy of the light incident on the light receiving surface of the light sensing element may be weak. This may also cause the electrical signal generated by the light-sensing element in response to received light to be weak, resulting in inaccurate fingerprint recognition.
Accordingly, embodiments of the present invention provide a display panel, which is used to dispose a photosensitive element inside the display panel and improve the energy of light incident on the photosensitive element.
Fig. 1 and fig. 2 show a display panel according to an embodiment of the present invention, in which fig. 1 is a schematic top view structure diagram of the display panel according to the embodiment of the present invention, and fig. 2 is a schematic cross-sectional structure diagram of the display panel shown in fig. 1 along the AA'. The display panel may include: a substrate base plate 100, a plurality of photosensitive elements 110 and a reflective layer 120 on the substrate base plate 100; the reflective layer 120 is located between the layer of the photosensitive element 100 and the substrate 100. The light receiving surface S1 of the light receiving element 110 faces the substrate 100, and the light receiving surface S1 and the upper surface S2 of the substrate 100 form a predetermined angle θ. The included angle θ is such that a normal F1 of the light receiving surface S1 intersects the reflective layer 120. In particular, in order to protect the film layers in the display panel, the display panel may further be provided with a protective substrate 200 located on a side of the photosensitive element 110 away from the substrate 100.
According to the display panel provided by the embodiment of the invention, the light receiving surface of the photosensitive element faces the substrate, so that external environment light can be prevented from being incident on the light receiving surface of the photosensitive element through the protective substrate. The light receiving surface and the upper surface of the substrate have a predetermined angle therebetween, so that the normal line of the light receiving surface and the reflective layer have an intersection at the angle. When a finger touches the display panel, light reflected by the finger and entering the display panel is incident on the reflecting layer, and light is incident on the light receiving surface of the light sensing element in a form of right angle as much as possible by the reflection action of the reflecting layer, so that the energy of the light incident on the light receiving surface of the light sensing element can be increased as much as possible, and the fingerprint identification accuracy is improved.
In a specific implementation, the photosensitive element may include: the fingerprint identification device comprises a photodiode and a switch transistor electrically connected with the photodiode, wherein the switch transistor is used for conducting a fingerprint identification chip and the photodiode under the control of a fingerprint identification control signal, so that the fingerprint identification chip can acquire an electric signal generated by each photodiode. Therefore, the fingerprint identification chip can determine a fingerprint image according to the acquired electric signals and then perform fingerprint identification according to the determined fingerprint image. In the embodiment of the present invention, the light receiving surface of the light sensing element may refer to a surface of the photodiode receiving light.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
In some possible embodiments, to implement a screen display, the display panel may include: and a plurality of pixel units, each of which may include a plurality of sub-pixel units. Specifically, each pixel unit includes sub-pixel units which may be a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit. Alternatively, the sub-pixel units included in each pixel unit may be a red sub-pixel unit, a green sub-pixel unit, a blue sub-pixel unit, and a white sub-pixel unit. These requirements are determined by design according to the actual application environment, and are not limited herein.
In order to avoid the influence of the photosensitive elements on the display effect, in a specific implementation, as shown in fig. 1 to fig. 3, where fig. 3 is a second schematic cross-sectional structure of the display panel shown in fig. 1 along the AA' direction, an orthogonal projection of each photosensitive element 110 on the substrate 100 and an orthogonal projection of each sub-pixel unit 130 on the substrate 100 do not overlap. This enables the orthographic projection of each photosensitive element 110 on the substrate 100 to be arranged in the orthographic projection of the adjacent sub-pixel unit 130 in the gap of the substrate 100, thereby avoiding the photosensitive element 110 and the sub-pixel unit 130 from influencing each other. Further, in practical implementation, an orthogonal projection of the at least one light sensing element 110 on the substrate 100 may be covered by a gap between at least two adjacent sub-pixel units 130 on the substrate 100. Furthermore, the orthographic projection of the substrate 100 of the gap between every two adjacent sub-pixel units 130 can be covered by the orthographic projection of one photosensitive element 110 on the substrate 100, so that more photosensitive elements 110 are arranged in the display area of the display panel, and the fingerprint identification accuracy can be improved. Alternatively, the orthographic projection of the substrate 100 by the gaps between two adjacent columns of the sub-pixel units 130 may cover the orthographic projection of the plurality of the light-receiving elements 110 on the substrate 100, and in this case, the number of the light-receiving elements 110 is not greater than the number of the sub-pixel units 130 in one column. This makes it possible to dispose the photosensitive elements 110 only in the gaps extending in the column direction. Alternatively, the orthographic projection of the substrate 100 by the gap between two adjacent rows of the sub-pixel units 130 may cover the orthographic projection of the plurality of light-sensing elements 110 on the substrate 100, and in this case, the number of the light-sensing elements 110 is not greater than the number of the sub-pixel units 130 in one row. This makes it possible to dispose the photosensitive elements 110 only in the gaps extending in the row direction. Of course, in practical applications, different application environments have different requirements on the number of the photosensitive units, and therefore, the number of the photosensitive elements and the form of the photosensitive elements located in the gap may be designed and determined according to the practical application environments, which is not limited herein.
In specific implementation, in the embodiment of the invention, the included angle θ between the light receiving surface S1 of each photosensitive element and the upper surface S2 of the substrate 100 may be the same, so that the difficulty of the manufacturing process of the photosensitive element 110 may be reduced. Alternatively, the included angle θ between the light receiving surface S1 of the partial photosensitive element and the upper surface S2 of the substrate board 100 may be the same, and the included angle θ between the light receiving surface S1 of the remaining partial photosensitive element and the upper surface S2 of the substrate board 100 may be different, and is not limited herein. Of course, in practical applications, the thickness of the film layer is different in different display panels, and the angle of the light incident on the reflective layer is also different, so that the specific value of the included angle θ can be designed and determined according to the practical application environment, and is not limited herein.
In specific implementation, in the embodiment of the present invention, each photosensitive element 110 may have the same inclination direction, so that the uniformity of the manufacturing process of the photosensitive elements 110 may be further maintained, and the difficulty of the manufacturing process may be reduced. For example, as shown in fig. 1 and 2, each photosensitive element 110 may be inclined toward the left side of the display panel (i.e., the side on which a is located with respect to a'). Alternatively, each of the light receiving elements 110 may be inclined toward the right side of the display panel (i.e., the side on which a' is located with respect to a). Of course, different application environments have different requirements on the inclination direction of the photosensitive element 110, and therefore, the inclination direction of the photosensitive element 110 can be designed and determined according to the actual application environment, and is not limited herein.
In specific implementation, in the embodiment of the present invention, as shown in fig. 3, the display panel may further include: a first light-shielding layer 140; the first light shielding layer 140 is located on a side of the layer where the photosensitive element 110 is located, which is away from the substrate 100. The orthographic projection of the first light shielding layer 140 on the substrate 100 covers the orthographic projection of each photosensitive element 110 on the substrate 100, and the orthographic projection of the first light shielding layer 140 on the substrate 100 does not overlap with the orthographic projection of each sub-pixel unit 130 on the substrate 100. By providing the first light-shielding layer 140 in this way, ambient light from the outside can be further prevented from being incident on the photosensitive element 110.
Liquid Crystal Display (LCD) panels have features of thin and light profile, power saving, and no radiation, and are widely used. The LCD panel operates on the principle of changing the arrangement of liquid crystal molecules in the liquid crystal layer by changing the voltage difference between two ends of the liquid crystal layer, so as to change the transmittance of the liquid crystal layer and display images. In practical implementation, in the embodiment of the present invention, as shown in fig. 3, the display panel may be a liquid crystal display panel. The sub-pixel unit may include a pixel electrode 131 on the substrate 100 and a Thin Film Transistor (TFT) 132 electrically connected to the pixel electrode 131. Of course, the substrate base plate is further provided with signal lines for transmitting signals, such as gate lines and data lines, so that the substrate base plate 100 may serve as an array base plate, and the protective base plate 200 may serve as an opposite base plate disposed opposite to the substrate base plate 100. This encapsulates a liquid crystal layer between the array substrate and the opposite substrate to implement an LCD panel. Since the LCD panel is also provided with a black matrix, the black matrix may be provided on the opposite substrate in order to avoid an influence of the black matrix on an optical path in a fingerprint recognition process.
In practical implementation, in the embodiment of the present invention, as shown in fig. 3, the layer where the photosensitive element is located may be located between the layer where the pixel electrode 131 is located and the layer where the TFT132 is located. Further, in particular implementations, the reflective layer 120 may be located between the layer on which the TFT132 is located and the base substrate 100. Further, the first light shielding layer 140 may be located on a side of the layer where the pixel electrode 131 is located facing the substrate 100. This can further prevent light emitted when the LCD panel displays a picture from being incident on the light sensing element 110.
Generally, the LCD panel is combined with the backlight module to realize the image display function, so that when the LCD panel is applied to the display device, the display device is further provided with the backlight module to provide light source for the LCD panel. In order to avoid the influence of the light emitted from the backlight module on the photosensitive element, in a specific implementation, as shown in fig. 3, in the embodiment of the present invention, the display panel may further include: and a second light-shielding layer 150. The second light-shielding layer 150 is located on the side of the photosensitive element 110 facing the substrate 100. For example, the second light shielding layer 150 may be located between the layer where the photosensitive element 110 is located and the reflective layer. In addition, the orthographic projection of the second light-shielding layer 150 on the base substrate 100 covers the orthographic projection of each light-receiving element 110 on the base substrate 100, so that the light incident through the base substrate can be prevented from being incident on the light-receiving element 110. In order to avoid the influence of the second light shielding layer 150 on the display, the orthographic projection of the second light shielding layer 150 on the substrate 100 is not overlapped with the orthographic projection of each sub-pixel unit 130 on the substrate 100. Further, in order to avoid the second light shielding layer 150 from shielding the light incident on the reflective layer 120 and to avoid the second light shielding layer 150 from shielding the light incident on the photosensitive element 110 by being reflected by the reflective layer 120, in an implementation, the orthographic projection of the second light shielding layer 150 on the substrate 100 does not overlap the orthographic projection of the reflective layer on the substrate, and the second light shielding layer 150 is not disposed on the light path incident on the photosensitive element 110 after being reflected by the reflective layer 120.
In a specific implementation, in the embodiment of the invention, the second light shielding layer may be made of the same material as the gate electrode in the TFT. Therefore, the patterns of the second light shielding layer and the grid electrode can be formed only by one-time composition process without adding an additional process for preparing the second light shielding layer, the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved. Alternatively, in an embodiment of the present invention, the second light-shielding layer may be made of the same material as the source and drain electrodes in the TFT. Therefore, the patterns of the second light shielding layer, the source electrode and the drain electrode can be formed only by one-time composition process without adding an additional process for preparing the second light shielding layer, so that the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved.
It should be noted that, since the thickness of the film layer is different for different display panels, the path of the light reflected by the reflective layer may also be different, and therefore, the specific position of the second light shielding layer may be designed and determined according to the above rules and practical application environment, which is not limited herein. In a specific embodiment, the light-shielding layers may be made of a material that is opaque, for example, a metal material. The specific material setting can be designed and determined according to the actual application environment, and is not limited herein.
In practical implementation and to avoid the influence of the reflective layer on the display, in the embodiment of the present invention, as shown in fig. 1 to 3, the orthogonal projection of the reflective layer 120 on the substrate 100 is located in the orthogonal projection of the substrate 100, and the gap between two adjacent sub-pixel units 130 is located. Wherein, each of the light-sensing elements 110 may correspond to one of the reflective layers 120. This allows the orthographic projection of the gap between two adjacent sub-pixel units 130 on the substrate 100 to cover the orthographic projection of one photosensitive element 110 on the substrate 100 and the orthographic projection of one reflective layer 120 on the substrate 100. Alternatively, the orthographic projection of the substrate 100 by the gap between two adjacent sub-pixel units 130 may cover the orthographic projection of the two photosensitive elements 110 on the substrate 100 and the orthographic projection of the two reflective layers 120 on the substrate 100, which is not limited herein.
Further, in order to avoid the signal lines on the substrate from blocking the light reflected by the fingers and then incident on the reflective layer 120, in specific implementation, the signal lines are avoided, so that the light reflected by the fingers and then incident on the reflective layer 120 can normally reach the reflective layer 120. Further, the light reflected by the reflective layer 120 may reach the light receiving element 110.
In practical implementation, as shown in fig. 4, fig. 4 is a schematic cross-sectional structural diagram of a reflective layer provided in an embodiment of the present invention, and the reflective layer may include a reflective prism 121. Wherein, the lower surface of the reflecting prism 121 is opaque, and the sawtooth surface of the reflecting prism 121 is used for reflecting the light reflected by the finger onto the photosensitive element 110. Alternatively, in an implementation, the reflective layer may also include a reflective sheet or a metal layer, such as a reflective layer made of silver, and is not limited herein.
Fig. 1, fig. 2 and fig. 5 are schematic structural diagrams of a display panel according to another embodiment of the present invention, wherein fig. 5 is a third schematic sectional structural diagram of the display panel shown in fig. 1 along the AA' direction, which is a modification of the embodiment of a partial structure in fig. 3. Only the differences between this embodiment and the embodiment shown in fig. 3 will be described below, and the same parts will not be described herein.
In an embodiment of the present invention, as shown in fig. 5, the sub-pixel unit 130 may include an electroluminescent Diode 133 and a pixel circuit 134 for driving the electroluminescent Diode 133 to emit Light, wherein the electroluminescent Diode includes an Organic Light Emitting Diode (OLED), a Micro Light Emitting Diode (Micro-LED), a Quantum Dot Light Emitting Diode (Quantum Dot Light Emitting Diodes, QLED), and the like, which have advantages of self-luminescence and low power consumption. Among them, the electroluminescent diode may include: OLED, Micro-LED and QLED. A general pixel circuit may include a plurality of transistors such as a driving transistor and a switching transistor, and a storage capacitor, and a specific structure thereof may be the same as that in the related art, and is not limited herein. Note that fig. 5 is described only by taking the driving transistor in the pixel circuit 134 as an example. The driving transistor may include a gate electrode, an active layer insulated from the gate electrode, and a source electrode and a drain electrode electrically connected to the active layer, wherein the drain electrode is electrically connected to the electroluminescent diode 133, and an orthographic projection of the gate electrode on the substrate 100 is located within an orthographic projection of a channel region of the active layer on the substrate 100. And, a conductive layer is further disposed on a side of the gate electrode away from the substrate, and the conductive layer has an overlapping region in an orthogonal projection of the substrate 100 and an orthogonal projection of the gate electrode on the substrate 100, so as to form a storage capacitor through the gate electrode and the conductive layer.
In order to avoid the influence of the light emitted from the electroluminescent diode 133 on the light sensing element 110, in the embodiment of the present invention, as shown in fig. 5, in the embodiment, the light sensing element 110 may be located between the layer where the electroluminescent diode 133 is located and the substrate 100. Further, in practical implementation, the display panel may further include a first light-shielding layer 140 located on a side of the layer where the photosensitive element 140 is located, the side being away from the substrate 100. The orthographic projection of the first light shielding layer 140 on the substrate 100 covers the orthographic projection of each photosensitive element 110 on the substrate 100, and the orthographic projection of the first light shielding layer 140 on the substrate 100 does not overlap with the orthographic projection of each sub-pixel unit 130 on the substrate 100. By providing the first light-shielding layer 140 in this way, ambient light from the outside can be further prevented from being incident on the photosensitive element 110.
Further, the layer of the first light shielding layer 140 may be located between the layer of the photosensitive element 110 and the layer of the electroluminescent diode 133, so as to further prevent the light emitted by the electroluminescent diode 133 from being incident on the photosensitive element 110.
In a specific implementation, in the embodiment of the invention, the second light shielding layer may be made of the same material as the gate electrode in the driving transistor. Therefore, the patterns of the second light shielding layer and the grid electrode can be formed only by one-time composition process without adding an additional process for preparing the second light shielding layer, the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved. Alternatively, in a specific implementation, in the embodiment of the invention, the second light shielding layer may be made of the same material as the source and the drain in the driving transistor. Therefore, the patterns of the second light shielding layer, the source electrode and the drain electrode can be formed only by one-time composition process without adding an additional process for preparing the second light shielding layer, so that the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved. Alternatively, the second light-shielding layer and the conductive layer may be made of the same material. Therefore, the patterns of the second shading layer and the conducting layer can be formed only by one-time composition process without adding an additional process for preparing the second shading layer, so that the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved.
In specific implementation, in order to avoid the influence of ambient light on the active layer of the transistor in the pixel circuit, a third light-shielding layer is further arranged between the active layer and the substrate, and the orthographic projection of the third light-shielding layer on the substrate covers the orthographic projection of the channel region of the active layer on the substrate. Specifically, the orthographic projection of the third light shielding layer on the substrate is overlapped with the orthographic projection of the channel region of the active layer on the substrate. In the embodiment of the invention, the second light shielding layer and the third light shielding layer may be made of the same material. Therefore, the patterns of the second light shielding layer and the third light shielding layer can be formed through one-time composition process, the preparation process can be simplified, the production cost can be saved, and the production efficiency can be improved.
Fig. 6 to 8 are schematic structural diagrams of a display panel according to still another embodiment of the present invention, fig. 6 is a second schematic top-view structural diagram of the display panel according to an embodiment of the present invention, fig. 7 is a first schematic cross-sectional structural diagram of the display panel shown in fig. 6 along the AA 'direction, and fig. 8 is a second schematic cross-sectional structural diagram of the display panel shown in fig. 6 along the AA' direction, which is a modification of the reflective layer shown in fig. 1, fig. 2, and fig. 5. Only the differences between this embodiment and the embodiments shown in fig. 1, 2 and 5 will be described below, and the same parts will not be described herein.
In practical implementation, in the embodiment of the present invention, as shown in fig. 6 to 8, an orthogonal projection of the reflective layer 120 on the substrate 100 may cover an orthogonal projection of the sub-pixel unit 130 on the substrate 100. Further, the orthographic projection of the reflective layer 120 on the substrate 100 may be overlapped with the orthographic projection of the sub-pixel unit 130 on the substrate 100. Alternatively, the area of the orthographic projection of the reflective layer on the substrate may be larger than the area of the orthographic projection of the sub-pixel unit on the substrate, so that the light incident on the light receiving surface of the light sensing element in a right angle manner can be improved by increasing the area of the reflective layer, thereby further improving the fingerprint identification accuracy.
In practical implementation, in the embodiment of the present invention, the electroluminescent diode 133 may be a transparent electroluminescent diode, that is, the anode and the cathode of the electroluminescent diode are both made of transparent conductive materials. This makes it possible for light emitted from the electroluminescent diode 133 to be reflected onto the light sensing element 110 through the reflective layer 120 at the time of fingerprint recognition. In order to avoid the influence of the light on the fingerprint recognition, the electrical signal generated by the light reflected from the electroluminescent diode 133 to the light-sensing element 110 through the reflective layer 120 can be removed as a noise signal by a fingerprint recognition method provided in the fingerprint recognition chip, so as to extract the electrical signal generated by the light reflected from the finger, incident on the reflective layer 120, and reflected from the reflective layer 120 to the light-sensing element 110. And then determining a fingerprint image according to the extracted electric signals, and then performing fingerprint identification according to the determined fingerprint image.
Fig. 9 to 11 are schematic structural diagrams of a display panel according to still another embodiment of the present invention, where fig. 9 is a second schematic top-view structural diagram of the display panel according to the embodiment of the present invention, fig. 10 is a schematic cross-sectional structural diagram of the display panel shown in fig. 9 along the AA 'direction, and fig. 11 is a schematic cross-sectional structural diagram of the display panel shown in fig. 9 along the BB' direction, which is a modification of the embodiments of the photosensitive element shown in fig. 6 and 7. Only the differences between this embodiment and the embodiments shown in fig. 6 and 7 will be described below, and the same parts will not be described herein.
In particular, the inclination directions of the different photosensitive elements may be different. In the embodiment of the present invention, as shown in fig. 9 to 11, at least two photosensitive elements may have different inclination directions. For example, as shown in fig. 10, the light sensing element 110_ a is inclined toward the left side of the display panel (i.e., the side where a is located with respect to a'). The light sensing element 110_ b is inclined toward the right side of the display panel (i.e., the side where a' is located with respect to a). Specifically, a part of the photosensitive elements may be oriented in a first direction, and the remaining part of the photosensitive elements may be oriented in a second direction. Alternatively, a part of the photosensitive elements may face the first direction, a second part of the photosensitive elements face the second direction, and a third part of the photosensitive elements face the third direction, which is not limited herein.
In practical implementation, in the embodiment of the present invention, as shown in fig. 11, an orthogonal projection of a gap between two adjacent sub-pixel units 130 on the substrate 100 may cover an orthogonal projection of two photosensitive elements on the substrate 100. Also, two photosensitive elements located in the same gap orthogonal projection may have different inclination directions. For example, the orthographic projection of the photosensitive element 110_ a and the photosensitive element 110_ B on the substrate 100 is located in the gap between two adjacent sub-pixel units 130, and the gap is within the orthographic projection of the substrate 100, wherein the photosensitive element 110_ a is inclined towards the left side of the display panel (i.e. the side where B is located relative to B'). The light sensing element 110_ B is inclined toward the right side of the display panel (i.e., the side where B' is located with respect to B). Alternatively, in a specific implementation, as shown in fig. 10, an orthogonal projection of a gap between two adjacent sub-pixel units 130 on the substrate 100 may cover an orthogonal projection of one photosensitive element 110 on the substrate 100, which is not limited herein.
In specific implementation, in the embodiment of the invention, the included angle θ between the light receiving surface S1 of each photosensitive element and the upper surface S2 of the substrate 100 may be the same, so that the difficulty of the manufacturing process of the photosensitive element 110 may be reduced. Alternatively, the included angle θ between the light receiving surface S1 of the partial photosensitive element and the upper surface S2 of the substrate board 100 may be the same, and the included angle θ between the light receiving surface S1 of the remaining partial photosensitive element and the upper surface S2 of the substrate board 100 may be different, and is not limited herein. Of course, in practical applications, the thickness of the film layer is different in different display panels, and the angle of the light incident on the reflective layer is also different, so that the specific value of the included angle θ can be designed and determined according to the practical application environment, and is not limited herein.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the display panel provided by the embodiment of the invention. The principle of the display device to solve the problem is similar to the display panel, so the implementation of the display device can be referred to the implementation of the display panel, and repeated details are not repeated herein.
In specific implementation, as shown in fig. 12, which is a schematic structural diagram of the display device provided in the embodiment of the present invention, the display device provided in the embodiment of the present invention may be: provided is a mobile phone. Of course, in specific implementation, the display device provided in the embodiment of the present invention may further include: any product or component with a display function, such as a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
According to the display panel and the display device provided by the embodiment of the invention, the light receiving surface of the photosensitive element faces the substrate, so that external environment light can be prevented from being incident on the light receiving surface of the photosensitive element through the protective substrate. The light receiving surface and the upper surface of the substrate have a predetermined angle therebetween, so that the normal line of the light receiving surface and the reflective layer have an intersection at the angle. When a finger touches the display panel, light reflected by the finger and entering the display panel is incident on the reflecting layer, and light is incident on the light receiving surface of the light sensing element in a form of right angle as much as possible by the reflection action of the reflecting layer, so that the energy of the light incident on the light receiving surface of the light sensing element can be increased as much as possible, and the fingerprint identification accuracy is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A display panel, comprising: the substrate comprises a substrate base plate, a plurality of photosensitive elements and a reflecting layer, wherein the plurality of photosensitive elements and the reflecting layer are positioned on the substrate base plate; the reflecting layer is positioned between the layer where the photosensitive element is positioned and the substrate base plate;
the light receiving surface of the photosensitive element faces the substrate base plate, and a set included angle is formed between the light receiving surface and the upper surface of the substrate base plate; the included angle enables a normal line of the light receiving surface and the reflecting layer to have an intersection point;
each photosensitive element has the same inclination direction; or
At least two of the photosensitive elements have different inclination directions.
2. The display panel of claim 1, wherein the display panel further comprises: a plurality of sub-pixel units; the orthographic projection of each photosensitive element on the substrate does not overlap with the orthographic projection of each sub-pixel unit on the substrate.
3. The display panel of claim 2, wherein an orthographic projection of at least one light sensing element on the substrate base is overlaid by a gap between at least two adjacent sub-pixel units on the substrate base.
4. The display panel of claim 1, wherein an orthographic projection of a gap between two adjacent sub-pixel units on the substrate base covers an orthographic projection of two photosensitive elements on the substrate base, the two photosensitive elements having different tilt directions.
5. The display panel according to any one of claims 2 to 4, wherein the display panel further comprises: the first shading layer is positioned on one side, away from the substrate, of the layer where the photosensitive element is positioned;
the orthographic projection of the first light shielding layer on the substrate covers the orthographic projection of each photosensitive element on the substrate, and the orthographic projection of the first light shielding layer on the substrate does not overlap with the orthographic projection of each sub-pixel unit on the substrate.
6. The display panel according to claim 5, wherein the display panel is an electroluminescent display panel; the sub-pixel unit comprises an electroluminescent diode;
the first shading layer is located between the layer where the electroluminescent diode is located and the photosensitive element.
7. The display panel of claim 6, wherein an orthographic projection of the reflective layer on the substrate base covers an orthographic projection of the sub-pixel unit on the substrate base.
8. The display panel of claim 5, wherein the display panel further comprises: the second shading layer is positioned on one side, facing the substrate, of the photosensitive element;
the orthographic projection of the second light shielding layer on the substrate covers the orthographic projection of each photosensitive element on the substrate, and the orthographic projection of the second light shielding layer on the substrate does not overlap with the orthographic projection of each sub-pixel unit on the substrate.
9. The display panel according to claim 8, wherein the display panel is a liquid crystal display panel; the sub-pixel unit comprises a pixel electrode; the first shading layer is positioned on one side, facing the substrate, of the layer where the pixel electrode is positioned.
10. The display panel according to claim 6 or 9, wherein an orthogonal projection of the reflective layer on the substrate base plate is positioned in a gap between two adjacent sub-pixel units within the orthogonal projection of the substrate base plate.
11. The display panel of any one of claims 1-4, wherein the reflective layer comprises reflective prisms.
12. The display panel according to any one of claims 1 to 4, wherein an angle between a light receiving surface of each of the photosensitive elements and an upper surface of the substrate base plate is the same.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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| CN110245610A (en) * | 2019-06-14 | 2019-09-17 | 京东方科技集团股份有限公司 | Show backboard and preparation method thereof and comprehensively screen fingerprint recognition display device |
| CN110807421B (en) * | 2019-10-31 | 2022-04-05 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110910770B (en) * | 2019-11-29 | 2022-02-08 | 武汉天马微电子有限公司 | Display panel and display device |
| WO2021159379A1 (en) * | 2020-02-13 | 2021-08-19 | 京东方科技集团股份有限公司 | Display panel and display apparatus |
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| CN111650769B (en) * | 2020-06-17 | 2023-05-12 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN112086572B (en) * | 2020-09-09 | 2022-06-10 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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