Display panel, display device and driving method of display panel

Abstract

The application discloses a display panel, a display device and a driving method of the display panel. The display panel comprises a plurality of pixel driving circuits and a plurality of light emitting units; each light emitting unit is electrically connected with a pixel driving circuit; at least part of the light emitting units comprises at least two sub-light emitting units; the at least two sub-light emitting units of the same light emitting unit are electrically connected with the same pixel driving circuit through a gating module; the gating module is used for receiving a control signal; according to the control signal, at least one of the at least two sub-light emitting units of the same light emitting unit is electrically connected with the pixel driving circuit; the pixel driving circuit drives at least one of the at least two sub-light emitting units of the same light emitting unit to emit light; wherein the total light emitting area of the sub-light emitting units connected with the pixel driving circuit in the same light emitting unit is different when the control signals are different. The application can improve the picture display quality of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel, a display device, and a driving method for the display panel. Background Technology

[0002] With the development of display technology, people have higher and higher requirements for the display quality of display panels. However, existing display panels are prone to color deviation when displaying images, which affects the display quality of the display panels. Summary of the Invention

[0003] The present invention provides a display panel, a display device, and a driving method for the display panel, so as to improve the color deviation of the display panel and enhance the display quality of the display panel.

[0004] According to one aspect of the present invention, a display panel is provided, comprising:

[0005] Multiple pixel driving circuits and multiple light-emitting units; each light-emitting unit is electrically connected to one of the pixel driving circuits.

[0006] At least some of the light-emitting units include at least two sub-light-emitting units, and the at least two sub-light-emitting units of the same light-emitting unit are electrically connected to the same pixel driving circuit through a gating module;

[0007] The gating module is used to receive a control signal and, according to the control signal, electrically connect at least one of the at least two sub-light-emitting units of the same light-emitting unit to the pixel driving circuit, so that the pixel driving circuit drives at least one of the at least two sub-light-emitting units of the same light-emitting unit to emit light. When the control signal is different, the total light-emitting area of ​​the sub-light-emitting units connected to the pixel driving circuit in the same light-emitting unit is different.

[0008] Optionally, the display panel may also include:

[0009] The driver chip is electrically connected to the gating module;

[0010] The driver chip is used to send the control signal to the gating module.

[0011] Optionally, the driver chip is used to obtain the screen refresh rate of the display panel, and send the control signal to the gating module of the light-emitting unit of at least one light-emitting color according to the screen refresh rate, wherein at least some of the control signals corresponding to the screen refresh rates are different from the control signals corresponding to other screen refresh rates;

[0012] Optionally, the display panel includes at least two different frequency groups, each frequency group includes at least one screen refresh rate, different frequency groups correspond to different screen refresh rate ranges, each frequency group has the same control signal, and different frequency groups have different control signals.

[0013] Optionally, the same control signal can be used for the same screen refresh rate.

[0014] Optionally, the driver chip is used to obtain the screen refresh rate and display brightness level of the display panel, and send the control signal to the gating module of the light-emitting unit of at least one light-emitting color according to the screen refresh rate and the display brightness level, wherein at least some of the screen refresh rates have control signals corresponding to the first preset display brightness level that are different from the control signals corresponding to other screen refresh rates at the first preset display brightness level; the minimum display brightness of different display brightness levels is the same, but the maximum display brightness is different; the maximum display brightness of the first preset display brightness level is less than or equal to the first brightness.

[0015] Optionally, at display brightness levels other than the first preset display brightness level, the control signal corresponding to each of the screen refresh rates is the same.

[0016] Optionally, the display area of ​​the display panel includes a central area and an edge area located on at least one side of the central area along a first direction;

[0017] The display area further includes an initialization signal line, which extends along the first direction and is electrically connected to the light-emitting unit; wherein the initialization signal line is used to transmit an initialization signal, and the initialization signal is transmitted from the edge area to the center area;

[0018] The driving chip is used to send the control signal to the gating module corresponding to the light-emitting unit of at least one light-emitting color in the edge region or the central region, so that the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the central region is greater than the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the edge region;

[0019] Optionally, the display area includes two edge areas, which are located on both sides of the central area along a first direction.

[0020] Optionally, the display area of ​​the display panel includes a central area and an edge area located on at least one side of the central area along a first direction;

[0021] The display area further includes an initialization signal line, which extends along the first direction and is electrically connected to the light-emitting unit; wherein the initialization signal line is used to transmit an initialization signal, and the initialization signal is transmitted from the edge area to the center area;

[0022] The driving chip is used to obtain the display brightness level of the display panel, and send the control signal to the gating module corresponding to at least one light-emitting unit of the light-emitting color in the edge area or the central area according to the display brightness level, so that the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the central area is greater than the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the edge area under the second preset display brightness level; wherein, the maximum display brightness of the second preset display brightness level is less than or equal to the second brightness.

[0023] Optionally, at display brightness levels other than the second preset display brightness level, the light-emitting area of ​​the light-emitting unit in the central area is equal to the light-emitting area of ​​the light-emitting unit in the edge area.

[0024] Optionally, the gating module includes at least two switching units, and each of the sub-light-emitting units is electrically connected to the pixel driving circuit through one of the switching units;

[0025] The control terminal of the switching unit is electrically connected to the driver chip;

[0026] Optionally, the switching unit includes a transistor.

[0027] Optionally, each of the sub-light-emitting units includes a first electrode, a light-emitting functional layer, and a second electrode;

[0028] Multiple sub-light-emitting units are arranged on the same layer, and a pixel-limiting layer is provided between adjacent sub-light-emitting units.

[0029] According to another aspect of the present invention, a display device is provided, including the display panel described in any embodiment of the present invention.

[0030] According to another aspect of the present invention, a driving method for a display panel is provided. The display panel includes a plurality of pixel driving circuits and a plurality of light-emitting units; each light-emitting unit is electrically connected to one of the pixel driving circuits; at least some of the light-emitting units include at least two sub-light-emitting units, and the at least two sub-light-emitting units of the same light-emitting unit are electrically connected to the same pixel driving circuit through a gating module; the gating module is used to receive a control signal, and according to the control signal, to electrically connect at least one of the at least two sub-light-emitting units of the same light-emitting unit to the pixel driving circuit, so that the pixel driving circuit drives at least one of the at least two sub-light-emitting units of the same light-emitting unit to emit light;

[0031] The driving method for the display panel includes:

[0032] A control signal is sent to the gating module, wherein when the control signal is different, the total light-emitting area of ​​the sub-light-emitting units connected to the pixel driving circuit in the same light-emitting unit is different.

[0033] This invention provides an embodiment where at least some light-emitting units include at least two sub-light-emitting units. Each sub-light-emitting unit is electrically connected to the same pixel driving circuit via a gating module. The gating module connects different sub-light-emitting units of the same light-emitting unit to the pixel driving circuit based on different control signals. This causes the pixel driving circuit to drive the different sub-light-emitting units of the same light-emitting unit to emit light, thereby adjusting the light-emitting area of ​​the light-emitting unit. Since different light-emitting areas result in different equivalent capacitances for the light-emitting units, different equivalent capacitances lead to different charging rates and different light-emitting durations. Therefore, this invention can adjust the equivalent capacitance of the light-emitting unit, thereby adjusting the charging rate, the light-emitting duration, and ultimately the brightness of the light-emitting unit, improving color shift in the display panel and enhancing the image display quality.

[0034] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1This is a schematic diagram of a display panel provided in an embodiment of the present invention;

[0037] Figure 2 yes Figure 1 A cross-sectional view of the central display panel along section line AA;

[0038] Figure 3 A schematic diagram of the connection between the driving circuit and the light-emitting unit provided in the embodiments of the present invention;

[0039] Figure 4 This is a schematic diagram of the connection between a driving circuit and a light-emitting unit provided in another embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the light emission duration of the light-emitting unit provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the arrangement of initialization signal lines provided in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the connection between a driving circuit and a light-emitting unit provided in another embodiment of the present invention;

[0044] Figure 9 This is a cross-sectional view of another display panel provided in an embodiment of the present invention;

[0045] Figure 10 This is a top view of a light-emitting unit provided in an embodiment of the present invention;

[0046] Figure 11 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] This embodiment provides a display panel. Figure 1 This is a schematic diagram of a display panel provided in an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the central display panel along section line AA. Figure 3 The connection diagram of the driving circuit and the light-emitting unit provided in the embodiments of the present invention is shown in the figure below. Figures 1-3 The display panel includes:

[0050] Multiple pixel driving circuits 10 and multiple light-emitting units 20; each light-emitting unit 20 is electrically connected to a pixel driving circuit 10.

[0051] At least some of the light-emitting units 20 include at least two sub-light-emitting units 21, and at least two sub-light-emitting units 21 of the same light-emitting unit 20 are electrically connected to the same pixel driving circuit 10 through the gating module 30;

[0052] The gating module 30 is used to receive control signals and, according to the control signals, electrically connect at least one of the at least two sub-light-emitting units 21 of the same light-emitting unit 20 to the pixel driving circuit 10, so that the pixel driving circuit 10 drives at least one of the at least two sub-light-emitting units 21 of the same light-emitting unit 20 to emit light. When the control signals are different, the total light-emitting area of ​​the sub-light-emitting units 21 connected to the pixel driving circuit 10 in the same light-emitting unit 20 is different.

[0053] The pixel driving circuit 10 may include at least two transistors and at least one capacitor. For example, the pixel driving circuit 10 may be a 2T1C circuit (including two transistors and one capacitor) or a 7T1C circuit (including seven transistors and one capacitor). The pixel driving circuit 10 drives the light-emitting unit 20 to emit light by outputting a driving current to the light-emitting unit 20. A light-emitting unit 20 may include two or more sub-light-emitting units 21. The light-emitting areas of different sub-light-emitting units 21 within the same light-emitting unit 20 may be the same or different, and the shapes of different sub-light-emitting units 21 may be the same or different; this embodiment does not impose specific limitations. Furthermore, it is possible to configure only some of the light-emitting units 20 in the display panel to include at least two sub-light-emitting units 21, or it is possible to configure all the light-emitting units 20 in the display panel to include at least two sub-light-emitting units 21. For example, it is possible to configure a portion of the light-emitting units 20 in the display panel to include at least two sub-light-emitting units 21, or it is possible to configure a portion of the light-emitting units 20 of a specific color in the display panel to include at least two sub-light-emitting units 21.

[0054] Specifically, each light-emitting unit 20 can be equivalent to a capacitor. During the light-emitting stage, after the driving current flows to the light-emitting unit 20, it first charges the light-emitting unit 20. After charging is completed, the light-emitting unit 20 emits light. Different light-emitting areas of the light-emitting units 20 result in different equivalent capacitances, different charging rates, and different charging times. The different charging times affect the light-emitting duration of the light-emitting units 20 in a frame, thus affecting the brightness of the light-emitting units 20. The selection module 30 selects different paths between the sub-light-emitting units 21 and the pixel driving circuit 10 according to the received control signal, causing different sub-light-emitting units 21 to emit light, thereby adjusting the light-emitting area of ​​the light-emitting units 20, thereby adjusting the charging rate, the light-emitting duration, and the brightness of the light-emitting units 20. By adjusting the brightness of the light-emitting units 20, the color shift of the display panel is adjusted.

[0055] For example, the same light-emitting unit 20 includes a first sub-light-emitting unit and a second sub-light-emitting unit. When the gating module 30 receives a first control signal, it selects the path between the first sub-light-emitting unit and the pixel driving circuit 10, so that the pixel driving circuit 10 drives the first sub-light-emitting unit to emit light. When the gating module 30 receives a second control signal, it selects the path between the second sub-light-emitting unit and the pixel driving circuit 10, so that the pixel driving circuit 10 drives the second sub-light-emitting unit to emit light. When the gating module 30 receives a third control signal, it selects the path between the first sub-light-emitting unit and the second sub-light-emitting unit and the pixel driving circuit 10, so that the pixel driving circuit 10 drives the first sub-light-emitting unit and the second sub-light-emitting unit to emit light simultaneously.

[0056] In this embodiment of the invention, at least some light-emitting units 20 include at least two sub-light-emitting units 21. At least two sub-light-emitting units 21 of the same light-emitting unit 20 are electrically connected to the same pixel driving circuit 10 through a gating module 30. The gating module 30 connects different sub-light-emitting units 21 of the same light-emitting unit 20 to the pixel driving circuit 10 according to different control signals, so that the pixel driving circuit 10 drives the different sub-light-emitting units 21 of the same light-emitting unit 20 to emit light. This adjusts the light-emitting area of ​​the light-emitting unit 20, adjusts the equivalent capacitance of the light-emitting unit 20, adjusts the charging rate of the light-emitting unit 20, adjusts the light-emitting duration of the light-emitting unit 20, and further adjusts the light-emitting brightness of the light-emitting unit 20, thereby improving the color shift of the display panel and enhancing the display quality of the display panel.

[0057] It should be noted that the control signal can be sent to the gating module 30 by the display panel's driver chip, or it can be sent to the gating module 30 by other modules; this embodiment does not impose any specific limitations. For example, a control module can be set in the display panel. After the display panel is manufactured, the areas of the display panel with color shift and the type of color shift are tested. Based on the color shift areas and types, the control module is configured so that it sends a control signal to the gating module 30 when displaying an image, thereby improving the color shift of the display panel.

[0058] The following explanation uses the example of a control signal being sent from the driver chip to the gating module 30 as an example:

[0059] Figure 4 This is a schematic diagram showing the connection between a driving circuit and a light-emitting unit according to another embodiment of the present invention. Optional, refer to... Figure 4 The display panel also includes a driver chip 40, which is electrically connected to the gating module 30; the driver chip 40 is used to send control signals to the gating module 30.

[0060] The driver chip 40 sends data driving voltage to the pixel driving circuit 10, causing the pixel driving circuit 10 to drive the light-emitting unit 20 to emit light according to the data driving voltage. The driver chip 40 can send control signals to the gating module 30 of the light-emitting unit 20 according to the color shift of the display panel, making the control signals of some light-emitting units 20 different from those of other light-emitting units 20, thereby adjusting the brightness of some light-emitting units 20 and improving color shift. The driver chip 40 can also send control signals to the gating module 30 of the light-emitting unit 20 according to the color shift of the display panel, making the control signals of at least some light-emitting units 20 different at different screen refresh rates, thereby improving color shift at certain screen refresh rates.

[0061] In this embodiment, the driving chip 40 sends a control signal to the gating module 30, thereby adjusting the emission brightness of the light-emitting unit 20 to achieve the adjustment of the color deviation of the display surface color. Without adding other modules, the cost of the display panel is ensured to be low.

[0062] Based on the above embodiment, the inventors have found through research that existing organic light-emitting diode (OLED) display panels usually include multiple pixel units, and each pixel unit includes at least three light-emitting units with different emission colors. For example, each pixel unit includes a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit. Since the brightness life attenuation of light-emitting units with different colors is inconsistent, different light-emitting area designs are usually carried out for light-emitting units with different emission colors to reduce the color deviation caused by the increase in use time, that is, to reduce the lifetime color deviation. However, the light-emitting areas of light-emitting units with different colors are different, resulting in different capacitances of light-emitting units with different colors, different charging rates of light-emitting units with different colors, and different proportions of the emission durations of light-emitting units with different colors in a single frame when the same driving data is used for different frame refresh frequencies, resulting in color deviation at certain frame refresh frequencies.

[0063] Exemplarily, Figure 5 is a schematic diagram of the emission duration of the light-emitting unit provided by an embodiment of the present invention. Refer to Figure 5 , Figure 5 Taking the light-emitting area of the red light-emitting unit R < the light-emitting area of the blue light-emitting unit B < the light-emitting area of the green light-emitting unit G as an example, the emission durations of each light-emitting unit are described. T1 is the duration of a single frame when the frame refresh frequency is 60 Hz, and T2 is the duration of a single frame when the frame refresh frequency is 15 Hz. The non-emission durations of the red light-emitting unit R, the blue light-emitting unit B, and the green light-emitting unit G in a single frame are T11, T21, and T31 respectively. At 60 Hz, the emission durations of the red light-emitting unit R, the blue light-emitting unit B, and the green light-emitting unit G in a single frame are T12, T22, and T32 respectively. At 15 Hz, the emission durations of the red light-emitting unit R, the blue light-emitting unit B, and the green light-emitting unit G in a single frame are (T12 + t), (T22 + t), and (T32 + t) respectively. Taking the red light-emitting unit R and the green light-emitting unit G as an example, when the frame refresh frequency changes from 60 Hz to 15 Hz, the ratio of the emission duration of the green light-emitting unit G to the red light-emitting unit R changes from T12 / T32 to (T12 + t) / (T32 + t). Since T12 < T32, then T12 / T32 < (T12 + t) / (T32 + t), that is, after the frame refresh frequency changes from 60 Hz to 15 Hz, the emission duration of the green light-emitting unit G relative to the red light-emitting unit R becomes longer, and the proportion of green light increases, and it is easy to appear green-biased.

[0064] Based on this, this embodiment provides another type of display panel. In this embodiment, the driver chip is used to obtain the screen refresh rate of the display panel and send control signals to the gating module of the light-emitting unit of at least one light-emitting color according to the screen refresh rate. In this case, the control signals corresponding to at least some screen refresh rates are different from the control signals corresponding to other screen refresh rates.

[0065] Specifically, the screen refresh rate, or screen update speed, represents the number of frames displayed per second. Common screen refresh rates include 1Hz, 60Hz, 90Hz, and 120Hz. The duration of one frame varies at different screen refresh rates. At least some screen refresh rates require different control signals than other screen refresh rates. This can mean that the control signals for each screen refresh rate are different from those for all other screen refresh rates; alternatively, some screen refresh rates may have the same control signals, while others may have different signals. This embodiment does not impose specific limitations on this.

[0066] refer to Figure 4 The driver chip 40 sends control signals to the gating module 30 of at least one light-emitting unit 20 with a specific light-emitting color according to the screen refresh rate. This control signal can be sent to the gating module 30 of one, two, or more light-emitting units 20 with different light-emitting colors according to the screen refresh rate. For example, the display panel can be configured to have only one type of light-emitting unit 20 with at least two sub-light-emitting units, and the driver chip 40 can send control signals to the light-emitting unit 20 of that color according to the refresh rate. The specific color of the light-emitting unit 20 that the driver chip 40 sends the control signal to can be determined according to the color shift type of the display panel. For example, if the display panel displays a greenish tint after switching to a certain screen refresh rate, the driver chip 40 can send different control signals to the green light-emitting unit according to the screen refresh rate, so that the green light-emitting unit adopts different light-emitting areas at different screen refresh rates, thereby adjusting the charging rate and light-emitting duration of the green light-emitting unit and improving the green tint. The driver chip 40 can also send different control signals to the red and blue light-emitting units according to the screen refresh rate, so that the red and blue light-emitting units adopt different light-emitting areas at different screen refresh rates, thereby adjusting the charging rate and light-emitting duration of the red and blue light-emitting units and improving the green tint.

[0067] Because the total luminous area of ​​the sub-luminous units 21 connected to the pixel driving circuit 10 in the same luminous unit 20 corresponding to different control signals is different, by setting luminous units 20 of at least one luminous color, the control signals corresponding to at least some screen refresh frequencies are different from the control signals corresponding to other screen refresh frequencies. This allows the luminous area of ​​luminous units 20 of at least one luminous color to be adjusted according to the screen refresh frequency when using the same driving data at different screen refresh frequencies. The charging rate of luminous units 20 of at least one luminous color can also be adjusted, thereby modulating the luminous duration of luminous units 20 of at least one luminous color and improving the color shift caused by different luminous durations at different screen refresh frequencies. Therefore, this embodiment of the invention can use the same driving data at different screen refresh frequencies and ensure that no color shift occurs when the display panel displays the image, shortening the debugging time of the display panel gamma debugging stage.

[0068] Optionally, the display panel includes at least two different frequency groups, each frequency group includes at least one screen refresh rate, different frequency groups correspond to different screen refresh rate ranges, each frequency group corresponds to the same control signal, and different frequency groups correspond to different control signals.

[0069] Specifically, two or more screen refresh rates with similar refresh rates can be grouped into the same frequency group, with the same control signal used within the same frequency group. By setting at least two different frequency groups, each corresponding to the same control signal, and different control signals for different frequency groups, the driving complexity of the driver chip can be reduced.

[0070] Optionally, the same control signal can be used for the same screen refresh rate.

[0071] That is, the light-emitting area of ​​each light-emitting unit 20 remains unchanged at the same screen refresh rate. With this setting, the driver chip 40 only needs to switch the control signal according to the screen refresh rate. Under the same screen refresh rate, there is no need to change the control signal, which reduces the driving difficulty of the driver chip 40.

[0072] Based on the above embodiments, the inventors discovered through research that when different screen refresh rates use the same driving data, color shift is prone to occur at low display brightness, while the color shift is not obvious at higher display brightness. Based on this, this embodiment provides another display panel. In this embodiment, the driving chip 40 is used to obtain the screen refresh rate and display brightness level of the display panel, and sends control signals to the gating module 30 of at least one light-emitting unit of a light-emitting color according to the screen refresh rate and display brightness level. Specifically, the control signals corresponding to at least some screen refresh rates at the first preset display brightness level are different from the control signals corresponding to other screen refresh rates at the first preset display brightness level; the minimum display brightness is the same for different display brightness levels, but the maximum display brightness is different; the maximum display brightness of the first preset display brightness level is less than or equal to the first brightness.

[0073] Specifically, the minimum display brightness corresponding to different display brightness levels (DBV) is 0, while the maximum display brightness corresponding to different display brightness levels varies from a few nits to several hundred nits. For example, the maximum display brightness may include 2 nits, 5 nits, 10 nits, 90 nits, 100 nits, 300 nits, 500 nits, or 800 nits. The brightness range that can be displayed by each display brightness level can be divided into 2... n The display panel can be divided into several gray levels, such as 0-255 or 0-1023. The brightness of the same gray level varies depending on the display brightness level. The initial brightness can be determined based on the brightness at which color shift occurs during the actual display. For example, the initial brightness can be less than or equal to 0.5 nits. The display brightness level is the level used when the display panel displays the current image, which is the image the display panel is about to display, i.e., the image displayed when the selection module selects the screen according to the control signal. The display refresh rate is the frequency at which the display panel refreshes the current image.

[0074] Because some screen refresh rates are prone to color shift at low display brightness, by setting the control signals for at least some screen refresh rates at a first preset display brightness level to be different from the control signals for other screen refresh rates at the same first preset display brightness level, the color shift of the display panel at low display brightness can be improved. Therefore, embodiments of the present invention can use the same driving data at different screen refresh rates and ensure that the display panel does not experience color shift when displaying images, thus shortening the debugging time of the display panel gamma debugging stage. Furthermore, for higher display brightness levels, different screen refresh rates can use the same control signal, reducing the driving difficulty of the display panel.

[0075] Optionally, at display brightness levels other than the first preset display brightness level, the control signal corresponding to each of the screen refresh rates is the same.

[0076] Specifically, when the display panel changes its screen refresh rate, if the maximum brightness of the display brightness level used at the current screen refresh rate is greater than the first brightness, and the maximum brightness of the display brightness level used at the new screen refresh rate is also greater than the first brightness, then no change in the control signal is required. If the display brightness level used at the new screen refresh rate is the first preset display brightness level, then the corresponding control signal is output based on the new screen refresh rate and the new display brightness level. In this embodiment, different screen refresh rates can use the same driving data when switching frequencies, and if neither the display brightness level used before nor after the frequency switch is the first preset display brightness level, then no change in the control signal is required, reducing the driving difficulty of the display panel.

[0077] Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Optional, see reference. Figure 6 The display area of ​​the display panel includes a central area 102 and an edge area 101 located on at least one side of the central area 102 along the first direction X;

[0078] The display area also includes an initialization signal line 50, which extends along the first direction X and is electrically connected to the light-emitting unit 20.

[0079] The driver chip is used to send a control signal to the gating module corresponding to at least one light-emitting unit 10 of light-emitting color in edge region 101 or central region 102, so that the light-emitting area of ​​at least one light-emitting unit of light-emitting color in central region 102 is greater than the light-emitting area of ​​at least one light-emitting unit of light-emitting color in edge region 101.

[0080] Specifically, Figure 7 This is a schematic diagram of the arrangement of initialization signal lines provided in an embodiment of the present invention, for reference. Figure 6 and Figure 7The initialization signal line 50 extends along the first direction X, and multiple initialization signal lines 50 are arranged sequentially along the second direction Y. The initialization signal is generally input to the initialization signal line 50 through one or both ends. Therefore, the transmission distance of the initialization signal to the light-emitting unit 20 in the central area 102 is greater than the transmission distance to the light-emitting unit 20 in the edge area 101. Since the initialization signal line 50 has a certain impedance, there will be a certain loss when the initialization signal is transmitted on the initialization signal line 50. The greater the transmission distance, the greater the loss, resulting in insufficient initialization of the light-emitting unit 20 in the central area 102. As a result, the charging rate of the light-emitting unit 20 in the central area 102 is greater than the charging rate of the light-emitting unit 20 in the edge area 101, and the charging time of the light-emitting unit 20 in the central area 102 is less than the charging time of the light-emitting unit in the edge area 101. This leads to a difference in the light-emitting time of the light-emitting units 20 in the central area 102 and the edge area 101, resulting in a color difference between the light-emitting units 20 in the central area 102 and the edge area 101 when displaying the image, which affects the image display quality.

[0081] This embodiment sends a control signal to the gating module corresponding to at least one light-emitting unit 20 of a light-emitting color in the edge region 101 or the central region 102, so that the light-emitting area of ​​the light-emitting unit 20 of the at least one light-emitting color in the central region 102 is greater than that of the light-emitting unit 20 of the at least one light-emitting color in the edge region 101, thereby reducing the charging rate of the light-emitting unit 20 of the at least one light-emitting color in the central region 102, thereby reducing the light-emitting brightness of the light-emitting unit 20 of the at least one light-emitting color in the central region 102, improving the color difference between the light-emitting units 20 of the central region 102 and the edge region 101 when displaying the screen, and improving the screen display quality.

[0082] It should be noted that the light-emitting unit 20 of at least one color may include a light-emitting unit 20 of one color, or a light-emitting unit 20 of two colors, or a light-emitting unit 20 of three colors. This embodiment does not make a specific limitation, and the specific color can be determined according to the color deviation type.

[0083] Optional, see reference Figure 6 The display area includes two edge areas 101, which are located on both sides of the central area 102 along the first direction X.

[0084] Specifically, when the initialization signal is input to the initialization signal line 50 through both ends, the loss of the initialization signal at both ends of the initialization signal line 50 is less than the loss of the initialization signal at the center of the initialization signal line 50. Therefore, the charging rate of the light-emitting unit 20 connected at both ends is different from the charging rate of the light-emitting unit 20 connected at the center. The two edge regions 101 correspond to the two ends of the initialization signal line, and the display area includes two edge regions 101. The two edge regions 101 are located on both sides of the central region 102 along the first direction X. This can improve the color difference between the light-emitting units 20 in the central region 102 and the two edge regions 101 when displaying the image, thereby improving the image display quality.

[0085] Based on the above embodiments, the inventors discovered through research that the central area 102 and the edge area 101 are prone to color shift at low display brightness, while the color shift is not obvious at higher display brightness. Based on this, this embodiment provides another display panel. In this embodiment, the driving chip is used to obtain the display brightness level of the display panel and, according to the display brightness level, sends a control signal to the gating module corresponding to at least one light-emitting unit 20 of a light-emitting color in the edge area 101 or the central area 102, so that the light-emitting area of ​​at least one light-emitting unit 20 of a light-emitting color in the central area 102 is greater than the light-emitting area of ​​at least one light-emitting unit 20 of a light-emitting color in the edge area 101 at the second preset display brightness level; wherein, the maximum display brightness of the second preset display brightness level is less than or equal to the second brightness.

[0086] The second brightness can be determined based on the brightness of the color shift that occurs in the central area 102 or the edge area 101. For example, the second brightness can be equal to the first brightness, and the second brightness can be less than or equal to 0.5 nit.

[0087] Since the central area 102 and the edge area 101 are prone to color shift at low display brightness, by making the light-emitting area of ​​at least one light-emitting color unit 20 in the central area 102 larger than that in the edge area 101 at the second preset display brightness level, the charging rate of the light-emitting unit 20 of at least one light-emitting color in the central area is increased and the brightness is improved at low display brightness. This can improve the color shift of the display panel at low display brightness. Furthermore, for higher display brightness levels, the central area 101 and the edge area 101 can use the same control signal, reducing the driving difficulty of the display panel.

[0088] Optionally, at display brightness levels other than the second preset display brightness level, the light-emitting area of ​​the light-emitting unit 20 in the central area 102 is equal to the light-emitting area of ​​the light-emitting unit 20 in the edge area 101. This setting reduces the driving difficulty of the display panel.

[0089] Optional, Figure 8 This is a schematic diagram showing the connection between a driving circuit and a light-emitting unit according to another embodiment of the present invention. (Refer to...) Figure 8 The gating module includes at least two switching units 31, and each sub-light-emitting unit 21 is electrically connected to the pixel driving circuit 10 through a switching unit 31.

[0090] The control terminal of the switching unit 31 is electrically connected to the driver chip 40.

[0091] Specifically, the driver chip 40 controls the switching unit 31 to be turned on or off by sending a control signal to the switching unit 31. For example, when the switching unit 31 needs to be turned on, the driver chip 40 sends an on control signal to the switching unit 31 to turn it on; when the switching unit 31 needs to be turned off, the driver chip 40 does not send a signal to the switching unit 31 to turn it off. Alternatively, the control terminal of the switching unit 31 is connected to a fixed potential, which controls the switching unit 31 to be turned on. When the switching unit 31 needs to be turned off, the driver chip 40 sends an off control signal to the switching unit 31 to turn it off.

[0092] Optionally, the switching unit 31 includes a transistor.

[0093] Specifically, the transistor has low on-resistance and is easy to control. By including a transistor in the switching unit 31, the switching unit 31 can be turned on to avoid affecting the driving circuit of the pixel driving circuit 10 to the light-emitting unit, and the control difficulty is low.

[0094] Figure 9 This is a cross-sectional view of another display panel provided in an embodiment of the present invention. Optionally, refer to... Figure 9 Each sub-light-emitting unit 21 includes a first electrode 201, a light-emitting functional layer 202, and a second electrode 203;

[0095] Multiple sub-light-emitting units 21 are arranged on the same layer, and a pixel limiting layer 60 is provided between adjacent sub-light-emitting units 21.

[0096] The first electrode 201 and the second electrode 203 can be the anode and cathode, or the cathode and anode, respectively. The light-emitting functional layer 202 can include a first functional layer, an organic light-emitting layer, and a second functional layer. The first functional layer is located between the organic light-emitting layer and the anode, and the second functional layer is located between the organic light-emitting layer and the cathode. The first functional layer can include at least one of a hole injection layer, a hole transport layer, and an electron blocking layer. The second functional layer can include at least one of an electron injection layer, an electron transport layer, and a hole blocking layer. Furthermore, the second electrodes 203 of the plurality of sub-light-emitting units 21 can be interconnected to form a complete layer of second electrodes 203.

[0097] Multiple sub-light-emitting units 21 are electrically connected to the pixel driving circuit 10 through a gating module, that is, the first electrodes 201 of the multiple sub-light-emitting units 21 are electrically connected to the pixel driving circuit 10 through the gating module respectively.

[0098] Figure 10 This is a top view of a light-emitting unit provided in an embodiment of the present invention. Optionally, refer to... Figure 10 The same light-emitting unit 20 includes a first sub-light-emitting unit 211 and a second sub-light-emitting unit 212. The light-emitting area of ​​the first sub-light-emitting unit 211 is different from that of the second sub-light-emitting unit 212.

[0099] Specifically, the light-emitting area of ​​the second sub-light-emitting unit 212 can be set to be larger than that of the first sub-light-emitting unit 211. In actual display, the first sub-light-emitting unit 211 and / or the second sub-light-emitting unit 212 can be controlled to emit light as needed.

[0100] This invention also provides a display device. Figure 11 This is a schematic diagram of a display device provided in an embodiment of the present invention, with reference to... Figure 11 The display device 100 includes the display panel 200 described in any embodiment of the present invention. The display device 100 can be an electronic product such as a mobile phone or tablet.

[0101] This invention also provides a driving method for a display panel, the display panel including a plurality of pixel driving circuits and a plurality of light-emitting units; each light-emitting unit is electrically connected to one of the pixel driving circuits; at least some of the light-emitting units include at least two sub-light-emitting units, and the at least two sub-light-emitting units of the same light-emitting unit are electrically connected to the same pixel driving circuit through a gating module; the gating module is used to receive a control signal, and according to the control signal, to electrically connect at least one of the at least two sub-light-emitting units of the same light-emitting unit to the pixel driving circuit, so that the pixel driving circuit drives at least one of the at least two sub-light-emitting units of the same light-emitting unit to emit light;

[0102] The driving method for the display panel includes:

[0103] A control signal is sent to the gating module, wherein when the control signal is different, the total light-emitting area of ​​the sub-light-emitting units connected to the pixel driving circuit in the same light-emitting unit is different.

[0104] The driving method of the display panel in this embodiment of the invention belongs to the same inventive concept as the display panel provided in any embodiment of the invention and has the same beneficial effects. For technical details not covered in this embodiment, please refer to the display panel described in any embodiment of the invention.

[0105] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0106] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A display panel, characterized in that, include: Multiple pixel driving circuits and multiple light-emitting units; Each of the light-emitting units is electrically connected to one of the pixel driving circuits; At least some of the light-emitting units include at least two sub-light-emitting units, and the at least two sub-light-emitting units of the same light-emitting unit are electrically connected to the same pixel driving circuit through a gating module; The gating module is used to receive a control signal and, according to the control signal, electrically connect at least one of the at least two sub-light-emitting units of the same light-emitting unit to the pixel driving circuit, so that the pixel driving circuit drives at least one of the at least two sub-light-emitting units of the same light-emitting unit to emit light. When the control signal is different, the total light-emitting area of ​​the sub-light-emitting units connected to the pixel driving circuit in the same light-emitting unit is different. The display panel also includes: The driver chip is electrically connected to the gating module; The driver chip is used to send the control signal to the gating module; The driving chip is used to obtain the screen refresh rate and display brightness level of the display panel, and send the control signal to the gating module of the light-emitting unit of at least one light-emitting color according to the screen refresh rate and the display brightness level. Specifically, the control signal corresponding to at least some of the screen refresh rates at the first preset display brightness level is different from the control signal corresponding to other screen refresh rates at the first preset display brightness level; the minimum display brightness is the same for different display brightness levels, but the maximum display brightness is different; the maximum display brightness of the first preset display brightness level is less than or equal to the first brightness level.

2. The display panel according to claim 1, characterized in that, At display brightness levels other than the first preset display brightness level, the control signal corresponding to each screen refresh rate is the same.

3. The display panel according to claim 1, characterized in that: The display panel includes a central area and an edge area located on at least one side of the central area along a first direction; The display area further includes an initialization signal line, which extends along the first direction and is electrically connected to the light-emitting unit; wherein the initialization signal line is used to transmit an initialization signal, and the initialization signal is transmitted from the edge area to the center area; The driving chip is used to send the control signal to the gating module corresponding to the light-emitting unit of at least one light-emitting color in the edge region or the central region, so that the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the central region is greater than the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the edge region.

4. The display panel according to claim 3, characterized in that, The display area includes two edge areas, which are located on both sides of the central area along a first direction.

5. The display panel according to claim 1, characterized in that: The display panel includes a central area and an edge area located on at least one side of the central area along a first direction; The display area further includes an initialization signal line, which extends along the first direction and is electrically connected to the light-emitting unit; wherein the initialization signal line is used to transmit an initialization signal, and the initialization signal is transmitted from the edge area to the center area; The driving chip is used to obtain the display brightness level of the display panel, and send the control signal to the gating module corresponding to at least one light-emitting unit of the light-emitting color in the edge area or the central area according to the display brightness level, so that the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the central area is greater than the light-emitting area of ​​the light-emitting unit of at least one light-emitting color in the edge area under the second preset display brightness level; wherein, the maximum display brightness of the second preset display brightness level is less than or equal to the second brightness.

6. The display panel according to claim 5, characterized in that, At any display brightness level other than the second preset display brightness level, the light-emitting area of ​​the light-emitting unit in the central area is equal to the light-emitting area of ​​the light-emitting unit in the edge area.

7. The display panel according to claim 1, characterized in that: The gating module includes at least two switching units, and each of the sub-light-emitting units is electrically connected to the pixel driving circuit through one of the switching units. The control terminal of the switching unit is electrically connected to the driver chip.

8. The display panel according to claim 7, characterized in that, The switching unit includes a transistor.

9. The display panel according to claim 1, characterized in that: Each of the sub-light-emitting units includes a first electrode, a light-emitting functional layer, and a second electrode; Multiple sub-light-emitting units are arranged on the same layer, and a pixel-limiting layer is provided between adjacent sub-light-emitting units.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

11. A driving method for a display panel, characterized in that: The display panel includes multiple pixel driving circuits and multiple light-emitting units; each light-emitting unit is electrically connected to one of the pixel driving circuits; at least some of the light-emitting units include at least two sub-light-emitting units, and the at least two sub-light-emitting units of the same light-emitting unit are electrically connected to the same pixel driving circuit through a gating module; the gating module is used to receive a control signal, and according to the control signal, to electrically connect at least one of the at least two sub-light-emitting units of the same light-emitting unit to the pixel driving circuit, so that the pixel driving circuit drives at least one of the at least two sub-light-emitting units of the same light-emitting unit to emit light; The driving method for the display panel includes: A control signal is sent to the gating module, wherein when the control signal is different, the total light-emitting area of ​​the sub-light-emitting units connected to the pixel driving circuit in the same light-emitting unit is different; The display panel also includes: The driver chip is electrically connected to the gating module; The driver chip is used to send the control signal to the gating module; The driving chip is used to obtain the screen refresh rate and display brightness level of the display panel, and send the control signal to the gating module of the light-emitting unit of at least one light-emitting color according to the screen refresh rate and the display brightness level. Specifically, the control signal corresponding to at least some of the screen refresh rates at the first preset display brightness level is different from the control signal corresponding to other screen refresh rates at the first preset display brightness level; the minimum display brightness is the same for different display brightness levels, but the maximum display brightness is different; the maximum display brightness of the first preset display brightness level is less than or equal to the first brightness level.

Images