Display panel and display device

Abstract

The application provides a display panel and a display device, a display area of the display panel comprises an optical component area and a conventional display area, and the optical component area and the conventional display area both comprise light emitting devices, so that the area of the display area is larger, and the trend of full-screen display is met. In the application, a first pixel circuit comprises a first storage capacitor electrically connected with a gate of a first driving transistor, and a second pixel circuit comprises a second storage capacitor electrically connected with a gate of a second driving transistor, wherein the capacitance of the first storage capacitor is larger than that of the second storage capacitor, the first storage capacitor can keep the potential of the gate of the first driving transistor high, and the display effect of the display panel is improved.

Description

[0001] This application is a divisional application of a patent application with the application date of July 28, 2020, the application number of 202010738054.3, and the invention title of "a display panel and a display device". TECHNICAL FIELD

[0002] The present application relates to the technical field of display, more specifically, to a display panel and a display device. BACKGROUND

[0003] With the continuous development of display technology, consumers' requirements for display panels are constantly improving, and various display panels are emerging and developing rapidly, such as liquid crystal display panels, organic light-emitting display panels, etc. On this basis, 3D display, touch display, curved display, ultra-high resolution display, and anti-peep display technologies are constantly emerging to meet the needs of consumers.

[0004] In recent years, in addition to the traditional role of information display, the appearance requirements of display panels are also gradually improving, and a larger screen ratio is the trend of the future market, so display panels with under-screen camera structures are favored by consumers. In the display panel with the under-screen camera structure, the camera is arranged below the display area of the display panel, and light can pass through the display area of the display panel to the camera to make the camera take pictures. However, the display effect of the display panel is deteriorated by arranging the under-screen camera structure in the display panel. SUMMARY

[0005] Therefore, the present application provides a display panel and a display device, which effectively solve the technical problems existing in the related art, improve the chroma uniformity of the display panel in the optical component area, and further improve the display effect of the display panel.

[0006] To achieve the above-mentioned purpose, the technical solutions provided by the present application are as follows:

[0007] A display panel comprises:

[0008] A plurality of pixels, the plurality of pixels comprising a first pixel and a second pixel, the first pixel comprising a first light-emitting device and a first pixel circuit connected to each other, and the first pixel circuit comprising a first drive transistor, the second pixel comprising a second light-emitting device and a second pixel circuit connected to each other, and the second pixel circuit comprising a second drive transistor;

[0009] A display area, the display area comprising an optical component area and a regular display area, the first light-emitting device being located in the optical component area, and the second light-emitting device being located in the regular display area;

[0010] The first pixel circuit comprises a first storage capacitor electrically connected with the gate of the first driving transistor, and the second pixel circuit comprises a second storage capacitor electrically connected with the gate of the second driving transistor, wherein the capacitance of the first storage capacitor is greater than the capacitance of the second storage capacitor.

[0011] Correspondingly, based on the same inventive concept, the present application also provides a display device comprising the display panel.

[0012] Compared with the related art, the technical solution provided by the present application has at least the following advantages:

[0013] The present application provides a display panel and a display device, the display area of the display panel comprises an optical component area and a conventional display area, and both the optical component area and the conventional display area comprise light emitting devices, so that the area of the display area is larger, meeting the trend of full-screen display. In the present application, the first pixel circuit comprises a first storage capacitor electrically connected with the gate of the first driving transistor, and the second pixel circuit comprises a second storage capacitor electrically connected with the gate of the second driving transistor, wherein the capacitance of the first storage capacitor is greater than the capacitance of the second storage capacitor, which can ensure that the first storage capacitor has high ability to maintain the potential of the gate of the first driving transistor, thereby improving the display effect of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0015] Figure 1 A structural schematic diagram of a display panel provided by the embodiment of the present application is provided.

[0016] Figure 2 A structural schematic diagram of a display device provided by the embodiment of the present application is provided.

[0017] Figure 3 A structural schematic diagram of another display panel provided by the embodiment of the present application is provided.

[0018] Figure 4 A structural schematic diagram of a pixel circuit provided by the embodiment of the present application is provided.

[0019] Figure 5 A timing diagram provided by the embodiment of the present application is provided.

[0020] Figure 6Another structure schematic diagram of a pixel circuit provided by an embodiment of the present application is shown in the figure;

[0021] Figure 7 Another timing diagram provided by an embodiment of the present application is shown in the figure;

[0022] Figure 8 Another structure schematic diagram of a display panel provided by an embodiment of the present application is shown in the figure;

[0023] Figure 9 A structure schematic diagram of a channel of a transistor provided by an embodiment of the present application is shown in the figure;

[0024] Figure 10 Another structure schematic diagram of a channel of a transistor provided by an embodiment of the present application is shown in the figure;

[0025] Figure 11 A structure schematic diagram of a display device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0027] As described in the background, in recent years, in addition to the traditional information display and other functions, the appearance requirements of display panels are also gradually increasing, and a larger screen ratio is the trend of the future market, so display panels with an under-screen camera structure are favored by consumers. In the display panel with the under-screen camera structure, the camera is arranged below the display area of the display panel, and light can pass through the display area of the display panel to the camera, so that the camera can take pictures. However, the arrangement of the under-screen camera structure in the display panel makes the display effect of the display panel worse.

[0028] Based on this, the embodiments of the present application provide a display panel and a display device, which effectively solve the technical problems existing in the related art, improve the chroma uniformity of the display panel at the optical component area, and further improve the display effect of the display panel.

[0029] To achieve the above object, the technical solutions provided by the embodiments of the present application are as follows, which are specifically combined with Figures 1 to 11 The technical solutions provided by the embodiments of the present application are described in detail.

[0030] Reference Figure 1 A structure schematic diagram of a display panel provided by an embodiment of the present application is shown in the figure, wherein the display panel provided by the embodiment of the present application comprises:

[0031] A plurality of pixels, the plurality of pixels comprising a first pixel and a second pixel, the first pixel comprising a first light emitting device 110 and a first pixel circuit 120 connected to each other, and the first pixel circuit 120 comprising a first drive transistor, the second pixel comprising a second light emitting device 210 and a second pixel circuit 220 connected to each other, and the second pixel circuit 220 comprising a second drive transistor.

[0032] A display area, the display area comprising an optical component area 101 and a regular display area 102, the first light emitting device 110 being located in the optical component area 101, the second light emitting device 210 being located in the regular display area 102, a light emitting device density of the optical component area 101 being less than a light emitting device density of the regular display area 102.

[0033] The first pixel comprises a first blue pixel b1, a first red pixel r1 and a first green pixel g1, a width-length ratio of the first drive transistor corresponding to the first blue pixel b1 being R1, a width-length ratio of the first drive transistor corresponding to the first red pixel r1 being R2, and a width-length ratio of the first drive transistor corresponding to the first green pixel g1 being R3, wherein R1>R2>0 and / or R1>R3>0.

[0034] It should be noted that the optical component area provided by the embodiment of the present application can be provided with an optical component such as a camera, and the present application does not make specific limitations thereon, and specific design should be made according to actual application. Figure 2 As shown in the display device structure diagram, the display device comprises a display panel 1 and an optical device 2, wherein the display panel 1 comprises an optical component area 101, the optical device 2 is arranged on a non-light-emitting side of the display panel 1, and the optical device 2 is arranged at the optical component area 101. Optionally, the optical device 2 can be a camera.

[0035] It can be understood that the display area of the display panel provided by the embodiment of the present application includes the optical component area and the conventional display area, and the optical component area and the conventional display area both include light emitting devices, so that the area of the display area is larger, and the trend of full screen display is met. Moreover, at the optical component area provided by the embodiment of the present application, the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first red pixel, and / or the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first green pixel; that is, at the optical component area provided by the embodiment of the present application, the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first red pixel; or, at the optical component area provided by the embodiment of the present application, the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first green pixel; or, at the optical component area provided by the embodiment of the present application, the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first red pixel, and the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first green pixel. Further, by increasing the width-length ratio of the first driving transistor corresponding to the first blue pixel, the light emitting efficiency of the first blue pixel is improved, and the purpose of improving the chroma uniformity of the display panel at the optical component area is achieved, and the display effect of the display panel is improved.

[0036] The calculation formula of the saturation current I of the specific transistor is as follows:

[0037] I = (1 / 2)Un*Cox*(W / L)*(|Vgs|-|Vth|) 2

[0038] Wherein, Un is the mobility of the transistor channel electron, Cox is the capacitance of the unit area gate oxide layer of the transistor, W / L is the width-length ratio of the transistor channel, Vgs is the gate-source voltage of the transistor, and Vth is the threshold voltage of the transistor. According to the calculation formula of the saturation current I of the transistor, increasing the width-length ratio W / L of the transistor can improve the saturation current I of the transistor, and further improve the light emitting efficiency of the light emitting device electrically connected with the transistor. The test data of a transistor is shown in Table 1 as follows:

[0039] W / L width-length ratio (unit of channel width and length: um) Current I Operation region 3 / 30 74 nA Saturation region 12 / 22 298 nA Saturation region 17 / 13 299 nA Saturation region

[0040] Table 1

[0041] It can be seen from Table 1 that the greater the width-length ratio of the transistor is, the greater the current is when the transistor works in the saturation region. And the test data of color deviation values of different display pictures of the display panel are shown in Table 2, wherein the width-length ratio of the driving transistor corresponding to the blue pixel, the red pixel and the green pixel in Comparative Example 1 is 3um / 19.435um, and the width-length ratio of the driving transistor corresponding to the red pixel and the green pixel in Comparative Example 2 is 3um / 19.435um, and the width-length ratio of the driving transistor corresponding to the blue pixel is 3um / 12um:

[0042] Display screen Color shift value of Comparative Example 1 Color shift value of Comparative Example 2 32 gray scale white screen 0.0110 0.00091 64 gray scale white screen 0.0089 0.00067 127 gray scale white screen 0.0075 0.00053 255 gray scale white screen 0.0067 0.00051 255 gray scale red screen 0.0049 0.00015 255 gray scale green screen 0.0034 0.00014 255 gray scale blue screen 0.0056 0.00022

[0043] Table 2

[0044] It can be seen from Table 2 that the greater the width-length ratio of the driving transistor corresponding to the blue pixel is, the smaller the color deviation value of the display picture displayed by the display panel is. Therefore, it can be seen from the test data of Table 1 and Table 2 that, on the basis of increasing the width-length ratio of the first driving transistor corresponding to the first blue pixel in the embodiment of the present application, the luminous efficiency of the first light emitting device corresponding to the first blue pixel can be improved; and on the basis of improving the luminous efficiency of the first light emitting device corresponding to the first blue pixel, the purpose of improving the chroma uniformity of the display panel at the optical component area can be achieved, thereby improving the display effect of the display panel.

[0045] In an embodiment of the present application, 2≤R1 / R2≤4 and 2≤R1 / R3≤4, that is, the ratio of any one of the width-length ratio R1 of the first driving transistor corresponding to the first blue pixel, the width-length ratio R2 of the first driving transistor corresponding to the first red pixel and the width-length ratio R3 of the first driving transistor corresponding to the first green pixel is not less than 2 and not greater than 4. In addition, the channel width of the first driving transistor corresponding to the first red pixel is W2, the channel width of the first driving transistor corresponding to the first green pixel is W3, the channel length of the first driving transistor corresponding to the first red pixel is L2, and the channel length of the first driving transistor corresponding to the first green pixel is L3, wherein |W2-W3|≤0.5um and |L2-L3|≤0.5um. By optimizing the proportion limit and size limit of the width-length ratio of the first driving transistor corresponding to the first blue pixel, the first red pixel and the first green pixel, the effect of ensuring the chroma uniformity of the display panel at the optical component area is high.

[0046] As shown in Figure 1 The first light emitting device 110 and the first pixel circuit 120 provided in the embodiment of the present application can be arranged at the optical component area 101. Alternatively, the first light emitting device provided in the embodiment of the present application can be arranged at the optical component area, and the first pixel circuit connected with the first light emitting device can be arranged at the conventional display area; for details, refer to Figure 3As shown, the display panel provided by the embodiment of the present application comprises a display area, and the display area comprises an optical component area 101 and a normal display area 102, wherein the first light emitting device 110 is located in the optical component area 101, and the first pixel circuit 120 connected with the first light emitting device 110 is located outside the optical component area 101, thereby further increasing the light transmission area of the optical component area and ensuring the effect of the device when the display panel is arranged at the optical component area. Optionally, the first pixel circuit 120 connected with the first light emitting device 110 is located between the normal display area 102 and the optical component area 101.

[0047] The pixel driving circuit provided by the embodiment of the present application is electrically connected with the light emitting device (i.e., the first pixel driving circuit is electrically connected with the first light emitting device, and the second pixel driving circuit is electrically connected with the second light emitting device), wherein the pixel driving circuit comprises a plurality of other transistors and capacitors in addition to the driving transistor, and all the transistors and capacitors work cooperatively to provide a driving current for the light emitting device, so that the light emitting device emits light in response to the driving current. The circuit composition of the first pixel driving circuit and the second pixel driving circuit provided by the embodiment of the present application can be the same, and reference is made to the circuit composition of the pixel driving circuit provided by the embodiment of the present application. Figure 4 As shown, the structure schematic diagram of the pixel driving circuit provided by the embodiment of the present application comprises: a driving transistor T0, a reset module 10, a data writing module 20, a control light emitting module 30 and a storage module 40 electrically connected with the driving transistor T0. The reset module 10 is used for transmitting a first reference voltage Vref1 to the gate of the driving transistor T0, so as to reset the gate potential of the driving transistor T0; the data writing module 20 is used for writing a data voltage Vdata to the first end of the driving transistor T0; the control light emitting module 30 is used for transmitting the driving current generated by the driving transistor T0 to the light emitting device 50, so as to make the light emitting device 50 emit light in response to the driving current; and the storage module 40 is used for keeping the voltage at the gate of the driving transistor T0. Optionally, the display panel provided by the embodiment of the present application is an organic light emitting display panel. Optionally, the transistors provided by the embodiment of the present application are all thin film transistors.

[0048] As shown, Figure 4As shown, the reset module 10 provided by the embodiment of the present application comprises a reset transistor T1, the first end of the reset transistor T1 is connected to a first reference voltage Vref1, the gate of the reset transistor T1 is electrically connected to a first control signal S1, and the second end of the reset transistor T1 is electrically connected to the gate of the driving transistor T0. The data writing module 20 comprises a first data writing transistor T2 and a second data writing transistor T3, the gates of the first data writing transistor T2 and the second data writing transistor T3 are electrically connected to a second control signal S2, the first end of the first data writing transistor T2 is connected to a data voltage Vdata, and the second end of the first data writing transistor T2 is electrically connected to the first end of the driving transistor T0; the first end of the second data writing transistor T3 is electrically connected to the gate of the driving transistor T0, and the second end of the second data writing transistor T3 is electrically connected to the second end of the driving transistor T0; the control light emitting module 30 comprises a first control light emitting transistor T4 and a second control light emitting transistor T5, the gates of the first control light emitting transistor T4 and the second control light emitting transistor T5 are electrically connected to a third control signal S3, the first end of the first control light emitting transistor T4 is connected to a first voltage, the second end of the first control light emitting transistor T4 is electrically connected to the first end of the driving transistor T0, the first end of the second control light emitting transistor T5 is electrically connected to the second end of the driving transistor T0, the second end of the second control light emitting transistor T5 is electrically connected to the first end of the light emitting device 50, and the second end of the light emitting device 50 is connected to a second voltage V2; and the storage module 40 comprises a storage capacitor C, the first plate of the storage capacitor C is connected to the first voltage V1, and the second plate of the storage capacitor C is electrically connected to the gate of the driving transistor T0.

[0049] In combination Figure 4 And Figure 5 As shown, Figure 5 A timing diagram is provided for the embodiment of the present application, wherein the embodiment of the present application takes the pixel circuit with all transistors being P-type transistors as an example (i.e. the transistor is turned on when the control signal connected to the gate of the transistor is at a low level, and the transistor is turned off when the control signal is at a high level), and the working process of the pixel driving circuit provided by the embodiment of the present application comprises a reset stage M1, a data writing stage M2 and a light emitting stage M3 performed in sequence:

[0050] In the reset stage M1, the reset transistor T1 is turned on to transmit the first reference voltage Vref1 to the gate of the driving transistor T0, at this time, the transistors of the data writing module 20 and the control light emitting module 30 are all turned off; wherein the first reference voltage Vref1 is a voltage capable of controlling the driving transistor T0 to be turned on.

[0051] In the data writing stage M2, the transistors of the data writing module 20 and the reset transistor T1 are all turned off. The first data writing transistor T2 and the second data writing transistor T3 are turned on, and the first data writing transistor T2 outputs the data voltage Vdata to the first end of the driving transistor T0, and the second data writing transistor T3 connects the gate and the second end of the driving transistor T0.

[0052] In the light emitting stage M3, the transistors of the data writing module 20 and the reset transistor T1 are all turned off. The first control light emitting transistor T4 and the second control light emitting transistor T5 are turned on to form a path of the first voltage V1, the first control light emitting transistor T4, the driving transistor T0, the second control light emitting transistor T5, the light emitting device 50 and the second voltage V2, and the driving current generated by the driving transistor T0 is transmitted to the light emitting device 50, and the light emitting device 50 emits light in response to the driving current.

[0053] Further, the pixel circuit provided by the embodiment of the present application can further include a black state maintaining module, as shown in Figure 6 Fig. 4 is a structural schematic diagram of another pixel circuit provided by the embodiment of the present application, wherein the pixel circuit further includes a black state maintaining module 60 electrically connected with the light emitting device, and the black state maintaining module 60 is used to transmit the second reference voltage Vref2 to the light emitting device 50 to control the light emitting device 50 to maintain the black state off state in the light emitting stage. As shown in Figure 6 Fig. 5, the black state maintaining module 60 provided by the embodiment of the present application includes a black state maintaining transistor T6, the gate of the black state maintaining transistor T6 is electrically connected with the fourth control signal S4, the first end of the black state maintaining transistor T6 is connected with the second reference signal Vref2, and the second end of the black state maintaining transistor T6 is electrically connected with the first end of the light emitting device 50. Wherein the embodiment of the present application Figure 6 Fig. 1, Fig. 2 and Fig. 3, the pixel circuit includes the same reset stage M1, data writing stage M2 and light emitting stage M3 as the pixel circuit shown in Figure 4 Fig. 1, Fig. 2 and Fig. 3, as shown in Figure 7 Fig. 6 is another timing diagram provided by the embodiment of the present application, wherein in the reset stage M1 and the data writing stage M2, the black state maintaining transistor T6 is controlled to be turned on by the fourth control signal S4, and then the black state maintaining transistor T6 transmits the second reference voltage Vref2 to the first end of the light emitting device 50 to control the light emitting device 50 to maintain the black state off state, so as to avoid the black state not dark in the reset stage and the data writing stage. And in the light emitting stage M3, the black state maintaining transistor T6 is controlled to be turned off by the fourth control signal S4 to ensure the normal light emitting of the light emitting device 50.

[0054] It should be noted that the embodiment of the present application does not make specific limitation to the specific circuit of the pixel circuit, and other circuit connection structures can also be used in other embodiments of the present application. In addition, the driving transistor, the reset transistor, the data writing transistor, the control light emitting transistor and the black state maintaining transistor provided by the embodiment of the present application can all be P-type thin film transistors, or the driving transistor, the reset transistor, the data writing transistor, the control light emitting transistor and the black state maintaining transistor can all be N-type thin film transistors. In addition, the first voltage provided by the embodiment of the present application is the voltage provided by the anode voltage terminal, and the second voltage is the voltage provided by the cathode voltage terminal. In addition, the light emitting device can be a light emitting diode, and the present application does not make specific limitation thereto.

[0055] Further, the present application can further optimize the design of the transistors, storage capacitors and other components in the first pixel circuit and / or the second pixel circuit to improve the performance of the pixel circuit and the display effect of the display panel. Specifically, the first pixel circuit provided by the embodiment of the present application includes a reset module, a data writing module and a control light emitting module electrically connected with the first driving transistor. The reset module includes at least one reset transistor electrically connected with the first driving transistor. The data writing module includes at least one data writing transistor electrically connected with the first driving transistor. The control light emitting module includes at least one control light emitting transistor electrically connected with the first driving transistor. The width-length ratio of the corresponding control light emitting transistor of the first pixel circuit provided by the embodiment of the present application is greater than the width-length ratio of the reset transistor and the data writing transistor in the same first pixel circuit.

[0056] In addition, the first pixel circuit provided by the embodiment of the present application further includes a black state maintaining module electrically connected with the first light emitting device. The black state maintaining module includes at least one black state maintaining transistor electrically connected with the first light emitting device. The width-length ratio of the corresponding control light emitting transistor of the first pixel circuit is greater than the width-length ratio of the black state maintaining transistor in the same first pixel circuit.

[0057] It can be understood that the control light emitting module provided by the embodiment of the present application is used to control the driving current generated by the first driving transistor to be transmitted to the first light emitting device, so that the light emitting device can emit light in response to the driving current. The control light emitting transistor of the control light emitting module is connected in series with the first driving transistor, so that the current transmitted by the control light emitting transistor is large. The width-length ratio of the control light emitting transistor in the first pixel circuit is made to be greater than the width-length ratio of the reset transistor, the data writing transistor and the black state maintaining transistor in the first pixel circuit, so as to improve the stability of the control light emitting transistor and improve the stability of the first pixel circuit. Optionally, the width-length ratio of the corresponding control light emitting transistor of the first pixel circuit provided by the embodiment of the present application is R kwherein, 4≤R k ≤6.

[0058] In an embodiment of the present application, the width-length ratio of the light-emitting transistor controlled by the first blue pixel is R k 1, the width-length ratio of the light-emitting transistor controlled by the first red pixel is R k 2, and the width-length ratio of the light-emitting transistor controlled by the first green pixel is R k 3; wherein, when R1>R2>0, R k 1>R k 2>0; and when R1>R3>0, R k 1>R k 3>0.

[0059] It can be understood that the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first red pixel, and / or the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first green pixel; and when the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first red pixel, the width-length ratio of the light-emitting transistor controlled by the first blue pixel is made greater than the width-length ratio of the light-emitting transistor controlled by the first red pixel, and when the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first green pixel, the width-length ratio of the light-emitting transistor controlled by the first blue pixel is made greater than the width-length ratio of the light-emitting transistor controlled by the first green pixel, so that the first pixel circuit corresponding to the first blue pixel further improves the stability of the first pixel circuit on the basis of transmitting greater current by the light-emitting transistor controlled by the first blue pixel.

[0060] In an embodiment of the present application, the first pixel circuit comprises a first storage capacitor electrically connected to the gate of the first driving transistor; the second pixel circuit comprises a second storage capacitor electrically connected to the gate of the second driving transistor; and the capacitance of the first storage capacitor is greater than the capacitance of the second storage capacitor.

[0061] It can be understood that the light emitting device density of the regular display area is greater than the light emitting device density of the optical component area, in order to improve the display brightness at the optical component area, it is often necessary to increase the driving current generated by the first driving transistor, and then increase the driving current to achieve the purpose of improving the light emitting efficiency of the first light emitting device; that is, under the same gray scale and the same color pixel conditions, the ratio of the driving current of the first light emitting device to the driving current of the second light emitting device is the ratio of the light emitting device density of the regular display area to the light emitting device density of the optical component area. Further, the first storage capacitor provided by the embodiment of the application is provided with a capacitance greater than the capacitance of the second storage capacitor, which can ensure that the first storage capacitor has high potential holding capacity for the gate of the first driving transistor, and further ensure that the stability of the first pixel circuit is high on the basis of ensuring that the overall brightness uniformity of the display panel is high. Optionally, the capacitance of the first storage capacitor is C1, and the capacitance of the second storage capacitor is C2, wherein 2≤C1 / C2≤4.

[0062] In an embodiment of the application, as shown in Figure 1 The second pixel provided by the application includes a second blue pixel b2, a second red pixel r2 and a second green pixel g2, the width-length ratio of the corresponding second driving transistor of the second blue pixel b2 is R1', the width-length ratio of the corresponding second driving transistor of the second red pixel r2 is R2', and the width-length ratio of the corresponding second driving transistor of the second green pixel g2 is R3', wherein R1'>R2'>0 and / or R1'>R3'>0.

[0063] It can be understood that, at the regular display area provided by the embodiment of the present application, the width-length ratio of the second driving transistor corresponding to the second blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second red pixel, and / or the width-length ratio of the second driving transistor corresponding to the second blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second green pixel; that is, at the regular display area provided by the embodiment of the present application, the width-length ratio of the second driving transistor corresponding to the second blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second red pixel; or, at the regular display area provided by the embodiment of the present application, the width-length ratio of the second driving transistor corresponding to the second blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second green pixel; or, at the regular display area provided by the embodiment of the present application, the width-length ratio of the second driving transistor corresponding to the second blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second red pixel, and the width-length ratio of the second driving transistor corresponding to the second blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second green pixel. Further, by increasing the width-length ratio of the second driving transistor corresponding to the second blue pixel, the light-emitting efficiency of the second blue pixel is improved, and the color uniformity of the display panel at the regular display area is improved, so that the color uniformity of the display panel at the regular display area and the optical component area is ensured, and the display effect of the display panel is further improved. Optionally, the channel width of the second driving transistor corresponding to the second red pixel is W2', the channel width of the second driving transistor corresponding to the second green pixel is W3', the channel length of the second driving transistor corresponding to the second red pixel is L2', and the channel length of the second driving transistor corresponding to the second green pixel is L3', wherein |W2'-W3'|≤0.5 μm and |L2'-L3'|≤0.5 μm.

[0064] Further, when R1'>R2'>0, the width-length ratio of the control light-emitting transistor of the second blue pixel is greater than the width-length ratio of the control light-emitting transistor of the second red pixel; and when R1'>R3'>0, the width-length ratio of the control light-emitting transistor of the second blue pixel is greater than the width-length ratio of the control light-emitting transistor of the second green pixel.

[0065] In an embodiment of the present application, the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the second driving transistor corresponding to the second blue pixel; the width-length ratio of the first driving transistor corresponding to the first red pixel is greater than the width-length ratio of the second driving transistor corresponding to the second red pixel; and the width-length ratio of the first driving transistor corresponding to the first green pixel in the optical component area is greater than the width-length ratio of the second driving transistor corresponding to the second green pixel. That is, R1>R1', R2>R2', and R3>R3'.

[0066] Further, a width-length ratio of the light-emitting transistor corresponding to the first blue pixel is greater than a width-length ratio of the light-emitting transistor corresponding to the second blue pixel, a width-length ratio of the light-emitting transistor corresponding to the first red pixel is greater than a width-length ratio of the light-emitting transistor corresponding to the second red pixel, and a width-length ratio of the light-emitting transistor corresponding to the first green pixel is greater than a width-length ratio of the light-emitting transistor corresponding to the second green pixel, thereby improving the stability of the first pixel circuit.

[0067] It can be understood that, by making the width-length ratio of the first driving transistor corresponding to any color pixel greater than the width-length ratio of the second driving transistor corresponding to the same color pixel, the driving current generated by the first driving transistor is increased, the light-emitting efficiency of the first light-emitting device corresponding to the first pixel is improved, the overall display brightness of the optical component area of the display panel is improved, and the purpose of improving the overall display brightness uniformity of the display panel is achieved. Optionally, the ratio of the width-length ratio of the first driving transistor corresponding to any color pixel to the width-length ratio of the second driving transistor corresponding to the same color pixel is S, where 3.5≤S≤5.

[0068] Further, the width-length ratio of the first driving transistor corresponding to any color pixel is greater than the width-length ratio of the second driving transistor corresponding to the same color pixel, so that the expected driving current can be generated by applying a smaller cross voltage to the first driving transistor. Therefore, the first pixel circuit and the second pixel circuit provided by the embodiment of the present application can be connected to the same voltage terminal, which reduces the wiring difficulty of the display panel and reduces the power consumption of the first pixel circuit. Figure 8 As shown in FIG. 12, the first pixel circuit 120 and the second pixel circuit 220 provided by the embodiment of the present application each include an anode voltage terminal and a cathode voltage terminal, the anode voltage terminal of the first pixel circuit 120 and the anode voltage terminal of the second pixel circuit 220 are electrically connected to the same voltage terminal PVDD, and the cathode voltage terminal of the first pixel circuit 120 and the cathode voltage terminal of the second pixel circuit 220 are electrically connected to the same voltage terminal PVEE.

[0069] As shown in FIG. 12, the first pixel circuit 120 and the second pixel circuit 220 provided by the embodiment of the present application each include an anode voltage terminal and a cathode voltage terminal, the anode voltage terminal of the first pixel circuit 120 and the anode voltage terminal of the second pixel circuit 220 are electrically connected to the same voltage terminal PVDD, and the cathode voltage terminal of the first pixel circuit 120 and the cathode voltage terminal of the second pixel circuit 220 are electrically connected to the same voltage terminal PVEE. Figure 9 As shown in FIG. 7, the channel 70 of the first driving transistor corresponding to the first blue pixel, the first driving transistor corresponding to the first red pixel, and the first driving transistor corresponding to the first green pixel is rectangular, and the width W and the length L of the channel 70 are optimized to achieve the expected ratio.

[0070] It can be understood that the width-length ratio of the transistor provided by the above-mentioned embodiment of the present application is greater than that of another transistor, for example, the width-length ratio of the first driving transistor of the first blue pixel can be greater than that of the first driving transistor of the first red pixel and that of the first driving transistor of the first green pixel; the width-length ratio of the second driving transistor of the second blue pixel can be greater than that of the second driving transistor of the second red pixel and that of the first driving transistor of the second green pixel; the width-length ratio of the first driving transistor of the first blue pixel can be greater than that of the second driving transistor of the second blue pixel, the width-length ratio of the first driving transistor of the first red pixel can be greater than that of the second driving transistor of the second red pixel, the width-length ratio of the first driving transistor of the first green pixel can be greater than that of the second driving transistor of the second green pixel, and the like. The width-length ratio of the transistor can be changed by changing the channel shape. Specifically, the transistor with a larger width-length ratio can be manufactured by using a rectangular channel as shown in FIG. 1, and the transistor with a smaller width-length ratio can be manufactured by using a channel with a bending shape (for example, a U shape) as shown in FIG. 2. The length L of the channel with the bending shape is greater than that of the rectangular channel when the width W of the channel is the same. Figure 9 Figure 10 The length L of the channel with the bending shape is greater than that of the rectangular channel when the width W of the channel is the same.

[0071] Alternatively, when the channel shape of the transistor is the same, the width of the channel can be increased and the length of the channel can be reduced, or the width of the channel can be kept unchanged and the length of the channel can be reduced, or the width of the channel can be increased and the length of the channel can be kept unchanged, so as to increase the width-length ratio of the transistor. The present application does not make a specific limitation in this regard.

[0072] Correspondingly, the present application further provides a display device. The display device provided by the embodiment of the present application comprises the display panel provided by any one of the above-mentioned embodiments.

[0073] Referring to FIG. 10, Figure 11 The display device provided by the embodiment of the present application can be a mobile terminal 1000. The mobile terminal comprises the display panel provided by any one of the above-mentioned embodiments.

[0074] It should be noted that the display device provided by the embodiment of the present application can also be a notebook computer, a tablet computer, a computer, a wearable device, and the like. The present application does not make a specific limitation in this regard.

[0075] ​The display panel and the display device provided by the embodiments of the present application have a display area including an optical component area and a normal display area, and the optical component area and the normal display area both include light emitting devices, so that the area of the display area is larger, and the trend of full screen display is met. In addition, in the optical component area provided by the embodiments of the present application, the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first red pixel, and / or the width-length ratio of the first driving transistor corresponding to the first blue pixel is greater than the width-length ratio of the first driving transistor corresponding to the first green pixel, so that the light emitting efficiency of the first blue pixel is improved, the chroma uniformity of the display panel in the optical component area is improved, and the display effect of the display panel is improved.

[0076] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized by, The display panel comprises: a plurality of pixels, the plurality of pixels comprising a first pixel and a second pixel, the first pixel comprising a first light emitting device and a first pixel circuit connected to each other, and the first pixel circuit comprising a first drive transistor, the second pixel comprising a second light emitting device and a second pixel circuit connected to each other, and the second pixel circuit comprising a second drive transistor; a display area, the display area comprising an optical component area and a regular display area, the first light emitting device being located in the optical component area, and the second light emitting device being located in the regular display area; the first pixel circuit comprises a first storage capacitor electrically connected to a gate of the first drive transistor, and the second pixel circuit comprises a second storage capacitor electrically connected to a gate of the second drive transistor, wherein a capacitance of the first storage capacitor is greater than a capacitance of the second storage capacitor; the first pixel circuit comprises a reset module and a control light emitting module electrically connected to the first drive transistor, the reset module comprising at least one reset transistor electrically connected to the first drive transistor, and the control light emitting module comprising at least one control light emitting transistor electrically connected to the first drive transistor; a width-length ratio of the corresponding control light emitting transistor of the first pixel circuit is greater than a width-length ratio of the reset transistor in the same first pixel circuit.

2. The display panel of claim 1, wherein, the first pixel comprises a first blue pixel, a first red pixel and a first green pixel, a width-length ratio of the corresponding first drive transistor of the first blue pixel is R1, a width-length ratio of the corresponding first drive transistor of the first red pixel is R2, and a width-length ratio of the corresponding first drive transistor of the first green pixel is R3, wherein R1>R2>0 and / or R1>R3>0.

3. The display panel of claim 1, wherein, the first pixel circuit further comprises a black state maintaining module and a control light emitting module electrically connected to the first light emitting device, the control light emitting module comprising at least one control light emitting transistor electrically connected to the first drive transistor, and the black state maintaining module comprising at least one black state maintaining transistor electrically connected to the first light emitting device; a width-length ratio of the corresponding control light emitting transistor of the first pixel circuit is greater than a width-length ratio of the black state maintaining transistor in the same first pixel circuit.

4. The display panel of claim 1, wherein, a capacitance of the first storage capacitor is C1, and a capacitance of the second storage capacitor is C2, wherein 2≤C1 / C2≤4.

5. The display panel of claim 2, wherein, the second pixel comprises a second blue pixel, a second red pixel and a second green pixel, a width-length ratio of the corresponding second drive transistor of the second blue pixel is R1', a width-length ratio of the corresponding second drive transistor of the second red pixel is R2', and a width-length ratio of the corresponding second drive transistor of the second green pixel is R3', wherein R1'>R2'>0 and / or R1'>R3'>0.

6. The display panel of claim 5, wherein, R1>R1', R2>R2', and R3>R3'.

7. The display panel of claim 1, wherein, any one of the first pixel circuit and the second pixel circuit comprises an anode voltage terminal and a cathode voltage terminal, wherein the anode voltage terminal of the first pixel circuit and the anode voltage terminal of the second pixel circuit are both electrically connected to the same voltage terminal. The anode voltage terminal of the first pixel circuit and the anode voltage terminal of the second pixel circuit are electrically connected to the same voltage terminal.

8. The display panel of claim 1, wherein, The first pixel includes a first blue pixel, a first red pixel and a first green pixel, and the channel of at least the first driving transistor corresponding to the first blue pixel is rectangular.

9. The display panel of claim 1, wherein, The first pixel circuit connected with the first light-emitting device is located in the regular display area.

10. The display panel of claim 1, wherein, The first pixel circuit connected with the first light-emitting device is located between the regular display area and the optical component area.

11. A display device comprising: The display device includes the display panel of any one of claims 1-10.

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