WO2020140279A1 - 显示面板及其操作方法 - Google Patents
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- WO2020140279A1 WO2020140279A1 PCT/CN2019/070457 CN2019070457W WO2020140279A1 WO 2020140279 A1 WO2020140279 A1 WO 2020140279A1 CN 2019070457 W CN2019070457 W CN 2019070457W WO 2020140279 A1 WO2020140279 A1 WO 2020140279A1
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- light
- emitting device
- photosensitive element
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- display
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Definitions
- At least one embodiment of the present disclosure relates to a display panel and an operation method thereof.
- At least one embodiment of the present disclosure provides a display panel having a display side and a non-display side opposite to the display side, and at least one first pixel area and at least one second pixel area.
- the first pixel area includes a first light emitting device and a first photosensitive element sequentially arranged along the direction from the display side to the non-display side
- the second pixel area includes a direction from the display side to the non-display side
- the second light emitting device and the second photosensitive element are arranged in this order.
- the second light emitting device is configured to emit second light toward the non-display side
- the second light receiving element is configured to allow the second light to enter and detect
- the first light emitting device and the second light emitting The device is configured to emit a first light to the display side
- the first photosensitive element is configured to allow the first light reflected by an external object to enter and detect, the second light is different from the first light .
- the first pixel area includes a plurality of the first light emitting devices and one first photosensitive element; and/or the second pixel area includes a plurality of Each of the second light emitting devices and one of the second photosensitive elements.
- the display panel includes a plurality of the first pixel regions and a plurality of the second pixel regions, the plurality of first pixel regions and the multiple The second pixel areas are alternately arranged in the first direction of the display panel.
- the first light-emitting device includes a first light-emitting driving upper electrode, a first light-emitting layer, and a second light-emitting device that are sequentially stacked from the display side to the non-display side A light-emitting driving lower electrode; and the second light-emitting device includes a second light-emitting driving upper electrode, a second light-emitting layer, and a second light-emitting driving lower electrode sequentially stacked from the display side to the non-display side.
- the second light-emitting driving lower electrode is configured as a metal grating having a second polarization direction to reflect light in a first polarization direction perpendicular to the second polarization direction ,
- the second light has the second polarization direction.
- the second photosensitive element includes a metal grating having the second polarization direction disposed toward a side of the second light emitting device.
- the first photosensitive element includes a metal grating having the first polarization direction disposed toward a side of the first light emitting device.
- the second light-emitting driving upper electrode is configured as a metal grating having the first polarization direction, and the first light emitted from the second light-emitting device has The first polarization direction.
- the first light-emitting driving upper electrode is configured as a metal grating with the first polarization direction, and the first light emitted from the second light-emitting device has The first polarization direction.
- the first light-emitting driving lower electrode is configured as a metal grating having the first polarization direction.
- the light emitted by the first light emitting device is away from the first photosensitive element.
- the first pixel area includes a display portion and a non-display portion
- the first light emitting device is located in the display portion
- the first light emitting drive lower electrode configuration It is a reflective electrode
- the first photosensitive element is at least partially located in the non-display portion or overlaps the edge of the display portion in a direction from the display side to the non-display side.
- the display panel provided by at least one embodiment of the present disclosure further includes a first base substrate, the first light emitting device and the second light emitting device are located on the first base substrate, the first light emitting device and The side of the second light emitting device facing away from the first base substrate is the display side.
- the first photosensitive element and the second photosensitive element are located on the first base substrate; or the display panel further includes A second base substrate on a side of the base substrate facing away from the first light emitting device, the first photosensitive element and the second photosensitive element are located on the second base substrate.
- the display panel provided by at least one embodiment of the present disclosure further includes a first base substrate, the first light emitting device and the second light emitting device are located on the first base substrate, and the first base substrate The side facing away from the first light emitting device and the second light emitting device is the display side.
- the first photosensitive element and the second photosensitive element are located on the first base substrate; or the display panel further includes A second base substrate of a side of the light emitting device facing away from the first base substrate, the first photosensitive element and the second photosensitive element are located on the second base substrate.
- the first photosensitive element and the second photosensitive element include at least one of a photodiode and a phototransistor.
- At least one embodiment of the present disclosure provides an operation method of a display panel provided according to any of the above embodiments, including: in a first state, causing the first light emitting device and the second light emitting device to emit light, and causing the second The photosensitive element detects the incidence of the incident second light, and the first light forms a display image; in the second state, at least the second light emitting device emits light, and the second photosensitive element is incident to The second light is detected, and the first light emitted by the second light emitting device is reflected by an external object and at least partially enters the first photosensitive element.
- the first light emitting device in the second state, is controlled not to emit light.
- 1A is a plan view of a display panel provided by some embodiments of the present disclosure.
- FIG. 1B is a cross-sectional view of the display panel shown in FIG. 1A along line I-I in one state;
- FIG. 1C is a cross-sectional view along line I-I of the display panel shown in FIG. 1A in another state;
- FIG. 2A is a partial cross-sectional view of a display panel in a state provided by some embodiments of the present disclosure
- 2B is a partial cross-sectional view of a display panel in a state provided by some embodiments of the present disclosure
- FIG. 3 is a partial cross-sectional view of another display panel provided by some embodiments of the present disclosure.
- FIG. 4 is a partial cross-sectional view of another display panel provided by some embodiments of the present disclosure.
- FIG. 5 is a partial cross-sectional view of another display panel provided by some embodiments of the present disclosure.
- FIG. 6 is a partial cross-sectional view of another display panel provided by some embodiments of the present disclosure.
- the pixel circuit includes a light emitting device (such as OLED (Organic Light-Emitting Diode, organic light emitting diode)), thin film transistor (Thin Film Transistor, TFT), storage capacitor, and the like.
- a light emitting device such as OLED (Organic Light-Emitting Diode, organic light emitting diode)
- TFT Thin Film Transistor
- the pixel circuit can control whether the TFT is turned on by a fixed gate scanning signal to charge the voltage corresponding to the display data to the storage capacitor, and control the display of the display unit by the magnitude of the voltage, Furthermore, the light emitting brightness of the display unit is adjusted.
- the process stability of TFT is the main factor affecting the display of the display screen. Due to the deviation of the manufacturing process of the TFT, there is a characteristic difference between the threshold voltage Vth and the mobility of each driving TFT in multiple pixel circuits, so that the brightness deviation between each pixel occurs, resulting in a decrease in the brightness uniformity of the display screen, and even Area spots or patterns. On the other hand, light-emitting devices made of organic materials will gradually age with use time and are not recoverable, and light-emitting devices in areas that have been lit for a long time will age faster, resulting in afterimages on the display screen. Therefore, in order to solve the technical problems regarding brightness uniformity and afterimage in the display device, in addition to the improvement of the process of the thin film transistor, compensation techniques have also been proposed, for example, including pixel compensation (ie, internal compensation) and external compensation.
- pixel compensation ie, internal compensation
- external compensation external compensation
- pixel compensation cannot satisfy all backplane technologies, it needs to be improved through external compensation.
- large-size display panels usually compensate pixel circuits by combining electrical compensation and optical compensation.
- This method can integrate the advantages of electrical compensation and optical compensation to improve the uniformity of the display panel.
- electrical compensation can determine the compensation data by sensing the voltage or current of the pixel circuit obtained by the signal line to compensate for the characteristics of the driving TFT (for example, threshold voltage and mobility, etc.); optical compensation can compensate the display as a whole
- the uniformity of the panel is compensated by optical compensation. Therefore, it can effectively compensate for display problems caused by various reasons, such as solving the Mura phenomenon generated in the device manufacturing process, and optical compensation. It can also be performed in real time, so that the actual light emission brightness can be accurately adjusted to the preset brightness.
- the detection device detects the actual light-emitting brightness of the display panel. At this time, the detected brightness is not the actual light-emitting brightness of the light-emitting device of the pixel. Therefore, if brightness compensation is performed, the actual light-emitting brightness after the display panel is adjusted deviates from the preset brightness, and thus cannot Realize real-time brightness compensation. That is, in this case, the interference between the light used for fingerprint recognition and brightness compensation is severe, resulting in poor accuracy of fingerprint recognition, and the compensation effect may also be deteriorated.
- At least one embodiment of the present disclosure provides a display panel.
- the display panel has a display side and a non-display side opposite to the display side, and includes at least one first pixel area and at least one second pixel area.
- the first pixel area includes a first light emitting device and a first photosensitive element sequentially arranged in a direction from a display side to a non-display side
- a second pixel area includes a second light emitting device and a second photosensitive element sequentially arranged in a direction from a display side to a non-display side element.
- the second light emitting device is configured to emit the second light toward the non-display side
- the second photosensitive element is configured to allow the second light to enter and perform detection
- the first light emitting device and the second light emitting device are configured to emit the first light toward the display side.
- a photosensitive element is configured to allow the first light reflected by the external object to enter and be detected, and the second light is different from the first light.
- different types of light rays may be that different light rays have different polarization states or have different polarization directions under the same polarization state.
- the types of light rays may include linearly polarized light, partially polarized light, circularly polarized light, and elliptically polarized light.
- both the second ray and the first ray are linearly polarized, but the polarization directions of the second ray and the first ray are different (for example, perpendicular to each other).
- the first light emitted by the first light emitting device and the second light emitting device may be used to form a display image; without interference from external objects, the second light emitted by the second light emitting device enters the first Two photosensitive elements, so that the second photosensitive element can at least detect the actual light-emitting brightness of the second light-emitting device, and accordingly, real-time brightness compensation can be performed on the second area.
- the recognition mode when an external object (such as a finger, palm, etc.) approaches, the first light emitted by the second light-emitting device is reflected by the finger and carries fingerprint information (brightness information) and enters the first photosensitive element, so that the first photosensitive element Fingerprint images can be acquired for fingerprint recognition.
- the first photosensitive element and the second photosensitive element respectively receive first light and second light of different types, thereby reducing the interference of light used for fingerprint recognition and brightness compensation, and eliminating or reducing The interference of the light reflected by the external object on the second photosensitive element improves the accuracy of brightness compensation, and thus the accuracy of fingerprint recognition.
- the external object to be identified may be an object with skin texture or other types of objects such as fingers and palms identified by optical detection.
- the fingerprint of the external object to be recognized is taken as an example for description.
- FIG. 1A is a plan view of a display panel provided by an embodiment of the present disclosure
- FIG. 1B is a cross-sectional view of the display panel shown in FIG. 1A along line II in a state
- FIG. 1C is a display panel shown in FIG. A cross-sectional view along line II in one state.
- the display panel shown in FIG. 1B is in the display mode
- the display panel shown in FIG. 1C is in the recognition mode.
- the finger is not close to (eg, not touching) the display surface of the display panel, and all the light emitted by the sub-pixels is used to form a display image
- the recognition mode the finger is close to (eg, touching) the display surface of the display panel to Perform fingerprint recognition.
- the light-emitting device eg, the first light-emitting device 110
- the light-emitting device is also provided with an encapsulation layer, an optical film, a cover plate, or other elements. Therefore, even if a finger has been pressed on the display surface of the display panel, As shown in FIG. 1, the fingerprint of the finger 1 and the light emitting device are still spaced from each other.
- the display panel includes multiple rows and multiple columns of pixel units.
- each pixel unit includes four color sub-pixels, in order of a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W, the four sub-pixels being arranged in a row.
- each sub-pixel occupies one pixel area.
- each pixel unit may include a red pixel R, a green pixel G, a blue pixel B but not a white pixel W, and for example, each pixel unit may include a red pixel R, green pixel G, blue pixel B, yellow pixel Y, etc.
- the display panel has at least one first pixel area 101 and at least one second pixel area 102, the first pixel area includes the first light emitting device 110 and the first photosensitive element 210, and the second pixel area 102
- the second light emitting device 120 and the second photosensitive element 220 are included, and the side of the first light emitting device 110 facing away from the first photosensitive element 210 is the display side (the upper side in the figure), and the side of the first photosensitive element 210 facing away from the first light emitting
- the side of the device 110 is the non-display side
- the side of the second light emitting device 120 facing away from the second photosensitive element 220 is the display side
- the side of the second light emitting element 220 facing away from the second light emitting device 120 is the non-display side (FIG. Lower side).
- the embodiments of the present disclosure have no limitation on the color of light emitted by the first pixel area 101 and the second pixel area 102. Meanwhile, the embodiments of the present disclosure do not limit the types and specific structures of the light-emitting element and the photosensitive element, for example, the light-emitting element may be an organic light-emitting element, a quantum dot light-emitting element, etc.
- the photosensitive element may be a photodiode, a photosensitive transistor, or the like.
- the first light-emitting device 110 and the second light-emitting device 120 emit first light (dashed arrow " ⁇ ") to form a display image so that a user on the display side can view the display image
- the second light emitted by the second light emitting device 120 enters the second photosensitive element 220 for brightness compensation.
- the user's finger 1 approaches the display panel, for example, touches the display side surface of the display panel, and the second light emitted by the second light emitting device 120 enters the second photosensitive element 220 for brightness compensation.
- the first light emitted by the first light emitting device 110 and the second light emitter 120 is reflected by the fingerprint of the finger 1 and enters the first photosensitive element 210.
- the first photosensitive element 210 detects the brightness of the first light to perform fingerprint identification.
- the display surface of the display panel has a display area for displaying an image, and at least part of the display area may serve as a fingerprint recognition area.
- all of the display area of the display panel serves as a fingerprint recognition area, and all of the display area is composed of the first pixel area 101 and the second pixel area 102 as shown in FIGS. 1B and 1C.
- the first pixel area 101 and the second pixel area 102 are evenly distributed in the display area of the display panel, so that the display panel has the functions of full-screen fingerprint recognition and brightness compensation.
- a portion of the display area of the display panel serves as a fingerprint recognition area, which is composed of the first pixel area 101 and the second pixel area 102 as shown in FIGS. 1B and 1C.
- the first pixel area 101 and the second pixel area 102 are evenly distributed in the fingerprint identification area, so that the fingerprint identification area of the display panel has the functions of fingerprint identification and brightness compensation.
- the first pixel area and the second pixel area may display an image as shown in FIG. 1B.
- the display panel provided by at least one embodiment of the present disclosure includes a plurality of first pixel regions and a plurality of second pixel regions, the plurality of first pixel regions and the plurality of second pixel regions are alternately arranged in the first direction of the display panel cloth.
- the first pixel regions 101 and the second pixel regions 102 are alternately arranged along the first direction (for example, the X-axis direction). For example, every two adjacent first pixel regions 101 and second pixel regions 102 form a group.
- the first light emitted from the second pixel region 102 is reflected by the finger 1 and enters the same group of first The photosensitive element 210 (refer to the relevant description of the embodiment shown in FIG. 3), and basically does not enter the first group of the first photosensitive element 210, so as to prevent the first light reflected at different positions of the finger 1 from entering the same first
- the photosensitive element 210 causes crosstalk in fingerprint recognition.
- the number correspondence relationship between the photosensitive elements (first photosensitive element, second photosensitive element) and the light emitting devices (first light emitting device, second light emitting device) is not limited.
- Each photosensitive element may correspond to one light emitting device, or may correspond to multiple light emitting devices.
- the first pixel area 101 includes one first light emitting device 110 and one first photosensitive element 210
- the second pixel area 102 includes one second light emitting device 210 and one second photosensitive element 220, that is, the first pixel area 101 and the second pixel area 102 respectively correspond to one sub-pixel.
- the fingerprint recognition accuracy of the display panels of these embodiments is high, and each photosensitive element (such as the second photosensitive element or the first photosensitive element and the second photosensitive element of the embodiment shown in 2A) can be used to detect a sub
- the luminous brightness of pixels improves the effect of brightness compensation.
- the first pixel area includes a plurality of first light emitting devices and a first photosensitive element
- the second pixel area includes a plurality of second light emitting devices and a first
- the two photosensitive elements that is, the first pixel area and/or the second pixel area correspond to a plurality of sub-pixels.
- a defective region usually includes multiple sub-pixels; and because the area of the fingerprint relative to the sub-pixels is large, In the fingerprint recognition area, even if the number of photosensitive elements used for fingerprint recognition is smaller than the number of sub-pixels, fingerprint images can be acquired for fingerprint recognition. In this way, for a region where multiple sub-pixels are located, setting one photosensitive element can perform brightness detection or detect sufficient fingerprint information, so the number of photosensitive elements (first photosensitive element and second photosensitive element) is small, simplifying the structure of the display panel, cut costs.
- the first light emitting device 110 in the fingerprint coverage area may be turned off, thereby preventing the light emitted by the first light emitting device 110 from interfering with fingerprint recognition. If the first light emitting device 110 is turned on, the light emitted by the fingerprint will be reflected by the fingerprint and enter the first photosensitive element 210, causing the first photosensitive element 210 to receive the reflected light at different positions of the fingerprint and interfere with fingerprint recognition; in addition, the light is fingerprinted The reflection may enter the second light-sensing element 220 in the adjacent sub-pixel.
- the second light-emitting device 120 interferes with the brightness detection of the second light-emitting device 120 by the second light-sensing element 220 (for example, the detection value is too high).
- the actual light emitting brightness of the two light emitting devices 120 is adjusted to deviate from the preset brightness (for example, the actual light emitting brightness is too small), that is, the brightness of the first light emitted by the second light emitting device 220 for fingerprint recognition deviates from the preset value, resulting in fingerprint recognition 'S accuracy is poor.
- FIG. 2A is a partial cross-sectional view of a display panel in a state provided by an embodiment of the present disclosure
- FIG. 2B is a partial cross-sectional view of a display panel in a state provided by an embodiment of the present disclosure, for example, respectively This corresponds to the display panel shown in FIGS. 1B and 1C.
- the display panel shown in FIG. 2A is in the display mode
- the display panel shown in FIG. 2B is in the recognition mode.
- the first light-emitting device includes a first light-emitting driving upper electrode, a first light-emitting layer, and a first light-emitting driving lower electrode that are sequentially stacked from the display side to the non-display side;
- the second light emitting device includes a second light-emitting driving upper electrode, a second light-emitting layer, and a second light-emitting driving lower electrode that are sequentially stacked from the display side to the non-display side.
- the first light emitting device 110 includes a stacked first light emitting driving upper electrode 111, a first light emitting layer 112, and a first light emitting driving lower electrode 113;
- the second light emitting device 120 includes a stacked second light emitting driving upper electrode 121, a second light emitting layer 122, and a second light emitting driving lower electrode 123.
- the light emitting device (first light emitting device 110, second light emitting device 120) may be an organic light emitting device or quantum dot light emitting device, and the light emitting layer (first light emitting layer 112, second light emitting layer 122) may be an organic light emitting layer or quantum Dot light emitting layer, one of the light emitting driving upper electrode (first light emitting driving upper electrode 111, the second light emitting driving upper electrode 121) and the light emitting driving lower electrode (first light emitting driving lower electrode 113, second light emitting driving lower electrode 123) is The anode is the cathode.
- the light emitting device may be an organic light emitting diode (OLED) or a quantum dot light emitting diode (PLED) light emitting device, or the like.
- the light-emitting layer (first light-emitting layer, second light-emitting layer) of the light-emitting device is configured to emit light of different colors, such as red light, green light, blue light, yellow light, white light, etc.; for example, a light-emitting device of multiple pixel areas
- the light-emitting layer is configured to be integrated to emit light of the same color, such as white light, blue light, yellow light, or light of other colors.
- the light emitted by the light-emitting layer of the light-emitting device is natural light, and the natural light can be converted into polarized light after passing through the structure of the light-emitting device except the light-emitting layer; the first light or the second light is only a component in one direction of the natural light,
- the light emitted from the light emitting layer is divided into the first light and the second light, and the light actually used for display is the light composed of the two components including the first light and the second light.
- the photosensitive element may be a photodiode such as a PIN type photodiode, a PN type photodiode, or other types of photodiodes, or the photosensitive element may be a phototransistor. As shown in FIGS.
- the first photosensitive element 210 and the second photosensitive element 220 are, for example, PN type or PIN type photodiodes, and from the display side to the non-display side (that is, from the upper side to the lower side in the figure), the first A photosensitive element 210 includes a first photosensitive driving upper electrode 211, a first photosensitive layer 212, and a first photosensitive driving lower electrode 213 that are sequentially stacked, and a second photosensitive element 220 includes a second photosensitive driving upper electrode 221, a second The second photosensitive layer 222 and the second photosensitive driving lower electrode 223.
- the photosensitive layer (the first photosensitive layer 212 and the second photosensitive layer 222) may include a semiconductor material, and the semiconductor material may be a silicon material. Under the action of light, the photosensitive layer generates photocharges, which can be converted into electrical signals (voltage signals Or current signal), the brightness of the first light incident on the photosensitive element can be detected by the electrical signal.
- the second light-emitting driving lower electrode is configured as a metal grating with a second polarization direction to transmit light with the second polarization direction and reflect the light perpendicular to the second polarization direction The light of the first polarization direction, whereby the first light rays exiting the display side have the first polarization direction, and the second light rays exiting the non-display side have the second polarization direction.
- the second light-emitting driving lower electrode 123 is configured as a metal grating having a second polarization direction.
- the second light has a second polarization direction
- the first light reflected by the second light-emitting driving lower electrode 123 has a first polarization direction perpendicular to the second polarization direction
- the first light is After reflection, the fingerprint cannot pass through the second light-emitting driving lower electrode 123 and enter the second photosensitive element 220. Therefore, in the recognition mode, the first light does not interfere with the detection of the second photosensitive element, so the second photosensitive element can detect the actual light emission brightness of the second light emitting device 120 without being affected by the reflected light, thereby ensuring real-time brightness compensation.
- the second photosensitive driving upper electrode of the second photosensitive element can transmit light
- the second photosensitive element can detect the light emitting brightness of the second light emitting device, thereby realizing Brightness compensation.
- the second photosensitive driving upper electrode may be a transparent or semi-transparent electrode, an electrode provided with a via, a metal grating, or the like.
- the second photosensitive element includes a metal grating having a second polarization direction disposed toward a side of the second light emitting device.
- the metal grating can be used as the second photosensitive driving upper electrode of the second photosensitive element.
- the second photosensitive driving upper electrode 221 is provided as a metal grating having a second polarization direction. In this way, the second light having the second polarization direction transmitted through the second light-emitting driving lower electrode 123 will not be absorbed when passing through the second photosensitive driving upper electrode 221, and the brightness will not decrease, so that the second photosensitive element 220 Detection accuracy is high.
- the second photosensitive driving lower electrode 223 may be configured as a reflective electrode to reflect the second light transmitted through the second photosensitive layer 222 back to the second photosensitive layer 222, thereby improving the second light incident on the second photosensitive element 220
- the utilization rate of the light source improves the detection accuracy of the second photosensitive element 220.
- the first light emitted by the second light-emitting device carries fingerprint information (brightness) after being reflected by the fingerprint, as long as the first photosensitive driving upper electrode of the first photosensitive element can transmit light, the carrying fingerprint
- the first light of the information can be incident on the first photosensitive element, so that the first photosensitive element can acquire a fingerprint image for fingerprint identification.
- the second photosensitive driving upper electrode may be a transparent or semi-transparent electrode, an electrode provided with a via, a metal grating, or the like.
- the first photosensitive element includes a metal grating having a first polarization direction disposed toward a side of the first light emitting device.
- the metal grating can serve as the first photosensitive driving upper electrode of the first photosensitive element.
- the first photosensitive driving upper electrode 211 is provided as a metal grating having a first polarization direction.
- the first light emitted from the first light emitting device 110 and the second light emitting device 120 to be reflected by the fingerprint and directed toward the first photosensitive element 210, the first light does not pass through the first photosensitive driving upper electrode 211 It will be absorbed and the brightness will not decrease, so that the transmittance of the first light reflected from the fingerprint to the first photosensitive layer 212 is high, thereby improving the detection accuracy of the first photosensitive element 210.
- the first photosensitive driving lower electrode 213 may be configured as a reflective electrode to reflect the first light transmitted through the first photosensitive layer 212 back to the first photosensitive layer 212, thereby improving the first light incident on the first photosensitive element 210
- the utilization rate of the sensor improves the detection accuracy of the first photosensitive element 210.
- the second light-emitting driving upper electrode is configured as a metal grating with a first polarization direction
- the first light emitted from the second light-emitting device has a first polarization direction.
- the second light-emitting driving lower electrode 123 is configured as a metal grating with a second polarization direction
- the second light-emitting driving upper electrode 121 is a metal grating with a first polarization direction.
- the interference of the light emitted by the second light emitting device 120 to the display side on the second photosensitive element 220 can be eliminated, and the detection accuracy of the second light emitting element 220 to the brightness of the second light emitting device 120 can be improved, thereby improving the The accuracy of brightness compensation, and further improve the accuracy of fingerprint recognition.
- the first light-emitting driving upper electrode is configured as a metal grating with a first polarization direction, and the first light emitted from the second light-emitting device has a first polarization direction.
- the first light-emitting driving upper electrode 111 is provided as a metal grating having a first polarization direction.
- the first light passes through the first light-emitting drive upper electrode 111, the first light The light can all pass through the first light-emitting drive upper electrode 111 to be incident on the first photosensitive element 210, increasing the transmittance of the first light, thereby improving the detection accuracy of the first photosensitive element 210.
- the first light-emitting driving upper electrode and the second light-emitting driving upper electrode may be provided as an integrated electrode to serve as a common electrode (eg, a common cathode) of the first light emitting device and the second light emitting device
- the common electrode is formed as a wire grid in a portion overlapping with the light emitting layer (for example, in the display portion 11), but in other portions (for example, in the non-display portion 12), for example, as a hollow area (opening) to The reflected first light is allowed to enter, so that the manufacturing process of the display panel can be simplified and the cost can be reduced.
- the first light-emitting driving lower electrode is configured as a metal grating having a first polarization direction.
- the first light-emitting driving lower electrode 113 of the first light-emitting device 110 is arranged as a metal grating having a first polarization direction.
- the first light-emitting device 110 may emit the first light having the first polarization direction to the non-display side, so that the first photosensitive element 210 can monitor the light-emitting brightness of the first light-emitting device 110 in real time.
- a light emitting device 110 performs brightness compensation. In this way, in the display mode, all sub-pixels of the display panel can achieve brightness compensation, thereby improving the display effect of the display panel.
- the first photosensitive element 210 may be provided to overlap the first light-emitting device 110.
- the luminous flux of the first light emitted by the first light emitting device 110 into the first photosensitive element 210 can be increased, and the detection accuracy of the first photosensitive element 210 can be improved.
- the position of the first photosensitive element 210 is biased toward the same group of second pixel regions 102, that is, the first photosensitive element 210 to the same group of second pixel regions
- the edge distance of 102 is smaller than the distance to the second pixel regions 102 of other groups.
- FIG. 3 is a partial cross-sectional view of another display panel provided by an embodiment of the present disclosure, the display panel being in a recognition mode.
- the light emitted by the first light emitting device is away from the first photosensitive element.
- the first light-emitting driving lower electrode 113a of the first light-emitting device 110a is set as a reflective electrode, and the first light-emitting device 110a emits light only to the display side, so that in the case of displaying an image, the first light The light utilization rate of the device 110a is high.
- the first pixel area includes a display portion and a non-display portion
- the first light emitting device is located in the display portion
- the light emitted from the first light emitting device is away from the first photosensitive element
- the first light-emitting driving lower electrode may be configured as a reflective electrode
- the first photosensitive element is at least partially located in the non-display portion or overlaps the edge of the display portion in a direction from the display side to the non-display side. Exemplarily, as shown in FIG.
- the pixel area (first pixel area 101, second pixel area 102) includes a display portion 11 and a non-display portion 12, and the first light emitting device 110a is located in the display portion 11 of the first pixel area 101
- the second light emitting device 120 is located in the display portion 11 of the second pixel area 102.
- the first light-emitting driving lower electrode 113a is configured as a reflective electrode, and the first photosensitive element 210 is partially located in the non-display portion 12 of the first pixel area 101. In this way, after the first light emitted by the second light emitting device 120 is reflected by the fingerprint, it can enter the first photosensitive element 210 obliquely without being blocked by the first light-emitting lower electrode 113a.
- the non-display portion 12 of the pixel area is usually provided with signal lines, such as gate lines, data lines, etc. There is a gap between the signal lines so that light can pass through the non-display portion 12.
- the driving electrodes of the photosensitive element and the light-emitting device are provided as metal gratings
- the driving electrodes may be entirely composed of metal gratings, or the driving electrodes may include metal gratings and transparent A stack of electrodes.
- the metal grating can be a plurality of thin metal wires arranged at equal intervals.
- the multiple thin metal wires are parallel to each other.
- the light emitted by the light source (such as a backlight) includes light that vibrates in various directions, where the vibration directions are parallel.
- the light in the direction of the metal grating can pass through the gap between the metal thin wires and form polarized light, while the light with the vibration direction perpendicular to the metal wire grid cannot pass through the gap between the metal thin wires and occur on the surface of the metal wire grid polarizer reflection.
- the width of the metal thin wire may be 50-60 nm
- the thickness (height) may be 100-170 nm
- the arrangement period (the sum of the spacing distance between adjacent metal thin wires and the width of one metal thin wire) may be 90-150 nm .
- one of the first light and the second light is TE light, and the other is TM light.
- one of the first light and the second light is S light, and the other is P light.
- the first light is S light and the second light is P light.
- the TE light has a first polarization direction
- the TM light has a second polarization direction
- the first polarization direction and The second polarization direction is perpendicular.
- the display panel may include a control circuit, such as a control chip.
- a control circuit such as a control chip.
- a first light-emitting drive circuit that drives the light-emitting luminance of the first light-emitting device
- a first light-sensitive drive circuit that drives the first light-sensitive element.
- a second light-emitting drive circuit that drives the light-emitting luminance of the second light-emitting device
- a second compensation drive circuit that drives the second photosensitive element
- the control chip is electrically connected with the first light-emitting drive circuit and the second light-emitting drive circuit, and may further be signal-connected with the first light-sensitive drive circuit and the second light-sensitive drive circuit to send an electrical signal reflecting the light-emitting brightness of the light-emitting device and receive fingerprint information And control the first light-emitting drive circuit and the second light-emitting drive circuit to perform brightness compensation on the first light-emitting device and the second light-emitting device.
- control chip may be a central processor, a digital signal processor, a single-chip computer, a programmable logic controller, or the like.
- the driving chip may further include a memory, and may also include a power module, etc., and the power supply and signal input and output functions are realized through additionally provided wires and signal lines.
- the driver chip may also include hardware circuits and computer executable code.
- the hardware circuit may include a conventional very large scale integration (VLSI) circuit or gate array and existing semiconductors such as logic chips, transistors or other discrete components; the hardware circuit may also include a field programmable gate array, programmable array logic, Programmable logic devices, etc.
- VLSI very large scale integration
- the display panel when detecting that a user's finger is close, switches the display panel to a recognition mode, and turns off the first light-emitting device in the area where the finger is located according to the position of the finger to avoid the first
- the light emitting device emits light and interferes with fingerprint recognition.
- the first photosensitive element may also be used to detect whether the display panel is touched to determine the touched position and the area where the fingerprint is located.
- the display mode no light (first light) enters the first photosensitive element, while in the recognition mode, part of the light emitted by the second light emitting device will be reflected by the fingerprint to the first photosensitive element of the same group.
- the detection result it can be determined that the second pixel area is covered by the fingerprint, and the position and area of the fingerprint can be located according to all the second pixel areas covered by the fingerprint.
- the display panel further includes a position touch structure 400.
- the position touch structure 400 includes multiple touch units.
- the position touch structure is used to detect whether the display panel is touched and the touched position, and determine the area where the fingerprint is located.
- the type of the position touch structure may include a resistive type, a capacitive type, an infrared type, an acoustic wave type, or other types.
- the capacitive position touch structure may include a self-capacitance type and a mutual capacitance type. When an external object (such as a finger) approaches, the capacitance value of the capacitive touch unit will change, so that the touched position of the display substrate can be detected.
- the embodiments of the present disclosure do not limit the specific type and structure of the position touch structure.
- the position touch structure can be used to detect whether the display panel is touched, and if there is a touch, the display panel can be switched to the recognition mode and try to acquire a fingerprint image for fingerprint recognition.
- the position touch structure may be attached to the display side of the display panel.
- the position touch structure in the manufacturing process of the display panel, may be formed on the display side of the display panel by non-lamination methods such as deposition and patterning, for example, as shown in FIG. 3,
- the light emitting device is covered with the encapsulation layer 300, and the position touch structure 400 (such as a touch electrode) is directly formed on the surface of the encapsulation layer 300.
- the light emitting device and the photosensitive element may be provided on one substrate, or may be provided on different substrates respectively, and the light emitting mode of the display panel (the light emitting device therein) for displaying images may be set
- the top emission can also be set to the bottom emission, and the positional relationship between the display side and the non-display side of the display panel, the photosensitive element and the light emitting device can be determined according to the light emitting mode.
- the light emitting mode of the display panel is top emission.
- the display panel further includes a first base substrate 10 and a second base substrate 20, a first light emitting device 110a and a second
- the light emitting device 120 is located on the first base substrate 10
- the side of the first light emitting device 110a and the second light emitting device 120 facing away from the first base substrate 10 is the display side
- the second base substrate 20 is located on the first base substrate
- the first photosensitive element 210 and the second photosensitive element 220 are located on the second base substrate 20.
- the first photosensitive element 210 and the second photosensitive element 220 may be located on the side of the second base substrate 20 facing the first base substrate 10, or may be located on the second base substrate 20 facing away from the first base substrate 10 Side.
- FIG. 4 is a partial cross-sectional view of another display panel provided by an embodiment of the present disclosure, the display panel being in a display mode.
- the light emitting mode of the display panel is top emission.
- the display panel further includes a first base substrate 10b, a first light emitting device 110b, a second light emitting device 120b, a first Both the photosensitive element 210b and the second photosensitive element 220b are located on the first base substrate 10b, and the sides of the first light emitting device 110b and the second light emitting device 120b facing away from the first base substrate 10b are the display side.
- the process of manufacturing the photosensitive element and the light-emitting device needs to be performed on the first base substrate 10b, which simplifies the structure and manufacturing process of the display panel, and is conducive to the thinning and thinning of the display panel; and
- the method helps to align the photosensitive element and the organic light-emitting device (sub-pixel) and improve the yield of the display panel.
- the display panel provided by at least one embodiment of the present disclosure further includes a first substrate substrate, the first light emitting device and the second light emitting device are located on the first substrate substrate, and the first light emitting device and the second light emitting device face away from the first One side of the base substrate is the display side.
- FIG. 5 is a partial cross-sectional view of another display panel provided by an embodiment of the present disclosure, the display panel being in a recognition mode.
- the light emitting mode of the display panel is bottom emission.
- the display panel further includes a first base substrate 10c and a second base substrate 20c, a first light emitting device 210c and a first The two light emitting devices 220c are located on the first base substrate 10c, the side of the first base substrate 10c facing away from the first light emitting device 110c and the second light emitting device 120c is the display side, and the second base substrate 20c is located on the first substrate On the side of the substrate 10c facing away from the first light emitting device 110c, the first photosensitive element 210c and the second photosensitive element 220c are located on the second base substrate 20c.
- the first photosensitive element 210c and the second photosensitive element 220c may be located on the side of the second base substrate 20c facing the first base substrate 10c, or may be located on the second base substrate 20c facing away from the first base substrate 10c Side.
- FIG. 6 is a partial cross-sectional view of another display panel provided by an embodiment of the present disclosure, the display panel being in a display mode.
- the light emitting mode of the display panel is bottom emission.
- the display panel further includes a first base substrate 10d, a first light emitting device 110d, a second light emitting device 120d, a first Both the photosensitive element 210d and the second photosensitive element 220d are located on the first base substrate 10d, and the sides of the first light emitting device 110d and the second light emitting device 120d facing the first base substrate 10d are the display side.
- the process of manufacturing the photosensitive element and the light emitting device needs to be performed on the first base substrate 10d, which simplifies the structure and manufacturing process of the display panel, and is conducive to the thinning and thinning of the display panel; and
- the method helps to align the photosensitive element and the organic light-emitting device (sub-pixel) and improve the yield of the display panel.
- the first base substrate and the second base substrate may be transparent substrates or non-transparent substrates, for example, glass substrates, plastic substrates, or the like.
- the display panel may further include optical films such as color filters and polarizing layers on the display side.
- the polarizing layer constitutes a circular polarizer.
- the circular polarizer includes a stacked linear polarizing layer and a quarter-wave plate.
- the linear polarizing layer is located on the display side.
- the axis of the quarter-wave plate is polarized with the linear polarizing layer. The axis is at an angle of 45 degrees, so when the external light passes through the circular polarizer, it is converted into circular polarized light. After the circular polarized light is reflected back by the electrodes in the display panel, it passes through the quarter wave plate for the second time.
- the polarizing layer can absorb the external light directed to the display substrate, thereby reducing the interference of external ambient light and improving the contrast of the display image of the display substrate.
- the color filter can absorb part of the ambient light to reduce the interference of the ambient light on the displayed image, and for a display panel having a light emitting device that emits white light, the color filter can cause the sub-pixels of the display panel to emit colored light to display a color image.
- the display panel may be any product or component with a display function, such as a TV, digital camera, mobile phone, watch, tablet computer, notebook computer, or navigator.
- a display function such as a TV, digital camera, mobile phone, watch, tablet computer, notebook computer, or navigator.
- At least one embodiment of the present disclosure provides an operation method of a display panel, including: in a first state, causing a first light emitting device and a second light emitting device to emit light, and causing a second photosensitive element to detect incident second light, and The first light forms a display image; in the second state, at least the second light emitting device emits light, and the second photosensitive element detects the incident second light, and the first light emitted by the second light emitting device is reflected by an external object for at least at least Partially injected into the first photosensitive element.
- the display panel can have both brightness compensation and recognition functions (such as fingerprint recognition), and can improve the accuracy of brightness compensation and the accuracy of fingerprint recognition.
- the first state is a display mode
- the second state is a recognition mode.
- the operation method of the display panel can be adjusted according to the specific structure of the display panel.
- the structure of the display panel reference may be made to the related descriptions in the foregoing embodiments, and details are not described herein.
- the first light emitting device in the second state, is controlled not to emit light. In this way, in the recognition mode, the light emitted by the first light-emitting device is prevented from causing interference with fingerprint recognition.
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Abstract
Description
Claims (19)
- 一种显示面板,具有显示侧和与所述显示侧相对的非显示侧,包括:至少一个第一像素区域,包括沿所述显示侧至所述非显示侧方向依次设置的第一发光器件和第一感光元件;以及至少一个第二像素区域,包括沿所述显示侧至所述非显示侧方向依次设置的第二发光器件和第二感光元件;其中,所述第二发光器件配置为向所述非显示侧发出第二光线,所述第二感光元件配置为允许所述第二光线入射并进行检测,所述第一发光器件和所述第二发光器件配置为向所述显示侧发出第一光线,所述第一感光元件配置为允许被外界物体反射的所述第一光线入射并进行检测,所述第二光线与所述第一光线类型不同。
- 根据权利要求1所述的显示面板,其中,所述第一像素区域包括多个所述第一发光器件和一个所述第一感光元件;和/或所述第二像素区域包括多个所述第二发光器件和一个所述第二感光元件。
- 根据权利要求1或2所述的显示面板,其中,所述显示面板包括多个所述第一像素区域和多个所述第二像素区域,所述多个第一像素区域和所述多个第二像素区域在所述显示面板的第一方向上交替排布。
- 根据权利要求1-3任一所述的显示面板,其中,所述第一发光器件包括由所述显示侧至所述非显示侧依次叠置的第一发光驱动上电极、第一发光层和第一发光驱动下电极;以及所述第二发光器件包括由所述显示侧至所述非显示侧依次叠置的第二发光驱动上电极、第二发光层和第二发光驱动下电极。
- 根据权利要求4所述的显示面板,其中,所述第二发光驱动下电极配置为具有第二偏振方向的金属光栅以反射与所述第二偏振方向垂直的第一偏振方向的光,所述第二光线具有所述第二偏振方向。
- 根据权利要求5所述的显示面板,其中,所述第二感光元件包括设置朝向所述第二发光器件的一侧的具有所述第二偏振方向的金属光栅。
- 根据权利要求5或6所述的显示面板,其中,所述第一感光元件包括设置朝向所述第一发光器件的一侧的具有所述第一偏振方向的金属光栅。
- 根据权利要求5-7任一所述的显示面板,其中,所述第二发光驱动上电极配置为具有所述第一偏振方向的金属光栅,所述第二发光器件出射的所述第一光线具有所述第一偏振方向。
- 根据权利要求5-8任一所述的显示面板,其中,所述第一发光驱动上电极配置为具有所述第一偏振方向的金属光栅,所述第二发光器件出射的所述第一光线具有所述第一偏振方向。
- 根据权利要求5-9任一所述的显示基板,其中,所述第一发光驱动下电极配置为具有所述第一偏振方向的金属光栅。
- 根据权利要求4-9任一所述的显示面板,其中,所述第一发光器件出射的光线背离所述第一感光元件。
- 根据权利要求11所述的显示面板,其中,所述第一像素区域包括显示部分和非显示部分,所述第一发光器件位于所述显示部分,所述第一发光驱动下电极配置为反射电极,并且所述第一感光元件至少部分位于所述非显示部分或者与所述显示部分的边缘在从所述显示侧到所述非显示侧的方向上重叠。
- 根据权利要求1-12任一所述的显示面板,还包括第一衬底基板,其中,所述第一发光器件和所述第二发光器件位于所述第一衬底基板上,所述第一发光器件和所述第二发光器件的背离所述第一衬底基板的一侧为所述显示侧。
- 根据权利要求13所述的显示面板,其中,所述第一感光元件和所述第二感光元件位于所述第一衬底基板上;或者所述显示面板还包括位于所述第一衬底基板的背离所述第一发光器件的一侧的第二衬底基板,所述第一感光元件和所述第二感光元件位于所述第二衬底基板上。
- 根据权利要求1-12任一所述的显示面板,还包括第一衬底基板,其中,所述第一发光器件和所述第二发光器件位于所述第一衬底基板上,所述第一衬底基板的背离所述第一发光器件和所述第二发光器件的一侧为所述显示侧。
- 根据权利要求15所述的显示面板,其中,所述第一感光元件和所述第二感光元件位于所述第一衬底基板上;或者所述显示面板还包括位于所述第一发光器件的背离所述第一衬底基板的一侧的第二衬底基板,所述第一感光元件和所述第二感光元件位于所述第二衬底基板上。
- 根据权利要求1-16任一所述的显示面板,其中,所述第一感光元件和所述第二感光元件包括光电二极管和光电晶体管至少之一。
- 一种根据权利要求1-17任一所述的显示面板的操作方法,包括:在第一状态,使得所述第一发光器件和第二发光器件发光,且使得所述第二感光元件对于入射的所述第二光线进行检测,并且所述第一光线形成显示图像;在第二状态,至少使得所述第二发光器件发光,且使得所述第二感光元件对于入射的所述第二光线进行检测,所述第二发光器件发出的所述第一光线被外界物体反射后至少部分射入所述第一感光元件。
- 根据权利要求18所述的操作方法,其中,在所述第二状态,控制所述第一发光器件不发光。
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WO2023115332A1 (zh) * | 2021-12-21 | 2023-06-29 | 京东方科技集团股份有限公司 | 显示装置及其驱动方法 |
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