Display device and driving method thereof

Abstract

The invention provides a display device and a driving method thereof, the display device comprises a display panel, a light-emitting power source and a time schedule controller, the light-emitting power source is electrically connected with the display panel, and the time schedule controller is electrically connected with the light-emitting power source; wherein the time schedule controller comprises a driving module, and the driving module is configured to adjust the switching frequency of the light-emitting power supply according to the load of the display device. According to the scheme, the display device can adjust the switching frequency of the light-emitting power source of the light-emitting unit under different load conditions, and the power consumption of the display device is reduced under the condition that the image quality is not affected.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a driving method thereof. Background Art

[0002] Organic Light-Emitting Diode (OLED) is a self-luminous display, so most of the power consumption of OLED comes from the light-emitting current of the device. As the average brightness of the display frame changes, the power consumption of the display device will also fluctuate. However, not all application scenarios have high requirements for brightness. Therefore, how to reduce the power consumption of OLED display devices in these application scenarios is an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a display device and a driving method thereof to solve the problem of high power consumption of an OLED display device in the related art.

[0004] To solve the above problems, the technical solutions provided by this application are as follows:

[0005] In a first aspect, the present application provides a display device, comprising:

[0006] Display panel;

[0007] a light emitting power source, electrically connected to the display panel; and

[0008] A timing controller, electrically connected to the light-emitting power source;

[0009] Wherein, the timing controller comprises a driving module, and the driving module is configured to adjust the switching frequency of the light-emitting power supply according to the load of the display device.

[0010] In one embodiment, the driving module includes:

[0011] The calculation submodule is configured to calculate the average picture brightness value of the current frame according to the light-emitting area and current load of the display device in the current frame.

[0012] In one embodiment, the driving module further includes:

[0013] The control submodule is configured to calculate the corresponding switching frequency gear according to the average picture brightness value of the current frame.

[0014] In one embodiment, the switching frequency gears include a first gear, a second gear, a third gear and a fourth gear.

[0015] In one embodiment, in the first gear, the switching frequency is 1500 Hz, corresponding to the average screen brightness value range of 75% to 100%;

[0016] In the second gear, the switching frequency is 1200 Hz, corresponding to the average screen brightness value range of 50% to 75%;

[0017] In the third gear, the switching frequency is 800 Hz, corresponding to the average screen brightness value range of 25% to 50%;

[0018] In the fourth gear, the switching frequency is 500 Hz, corresponding to the average screen brightness value range of 0% to 25%.

[0019] In one embodiment, the light emitting power source comprises:

[0020] A register is electrically connected to the control submodule, and the register is configured to control the switch state and setting adjustment of the light-emitting power supply.

[0021] In one embodiment, the driving module further includes:

[0022] The communication submodule is electrically connected to the control submodule, and the communication submodule is configured to communicate between the control submodule and the register via an I2C protocol.

[0023] In a second aspect, the present application provides a method for driving a display device, comprising:

[0024] Obtaining the light emitting area and current load of the display device in the current frame;

[0025] Calculate the average picture brightness of the current frame according to the light-emitting area and the current load;

[0026] Calculating the target switching frequency level according to the average picture brightness of the current frame;

[0027] The light emitting power source of the display device is controlled to be at the target switching frequency level.

[0028] In one embodiment, obtaining the current light emitting area of ​​the display device includes:

[0029] Get the total number of pixels of the display device;

[0030] Count the number of pixels in the current frame image that are lit;

[0031] Dividing the number of pixels in the lit state by the total number of pixels to obtain a lit pixel ratio;

[0032] The light-emitting area is obtained according to the product of the ratio of the lighted pixels and the total light-emitting area of ​​the display device.

[0033] In one embodiment, calculating the average picture brightness of the current frame according to the light emitting area and the current load includes:

[0034] Calculate the sum of all pixel brightness values ​​in the current frame image;

[0035] Determine the total number of pixels of the current frame image;

[0036] Calculating an average picture brightness value according to the sum of the pixel brightness values ​​and the total number of pixels;

[0037] The average screen brightness value is converted into an average screen brightness in percentage form.

[0038] The display device provided in the embodiment of the present application includes a display panel, a light-emitting power supply and a timing controller, wherein the light-emitting power supply is electrically connected to the display panel, and the timing controller is electrically connected to the light-emitting power supply; wherein the timing controller includes a driving module, and the driving module is configured to adjust the switching frequency of the light-emitting power supply according to the load of the display device. Through the above scheme, the display device of the present application can adjust the switching frequency of the light-emitting power supply of the light-emitting unit under different load conditions, thereby reducing the power consumption of the display device without affecting the image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Attached Figure 1 is a schematic diagram of the module structure of the display device in the embodiment of the present application;

[0041] Attached Figure 2 This is an optional light-emitting driving circuit diagram in the embodiment of the present application;

[0042] Attached Figure 3 Schematic diagram of the PFC operation principle in the embodiment of the present application.

[0043] Description of reference numerals in the figures:

[0044] 1. Display device; 100. Display panel; 200. Light-emitting power source; 210. Register; 300. Timing controller; 310. Driving module; 311. Calculation submodule; 312. Control submodule; 313. Communication submodule. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0046] Reference Figure 1 As shown, according to the first aspect of the present application, a display device 1 is provided, the display device 1 includes: a display panel 100, a light-emitting power supply 200 and a timing controller 300, the light-emitting power supply 200 is electrically connected to the display panel 100, and the timing controller 300 is electrically connected to the light-emitting power supply 200. Among them, the timing controller 300 includes a driving module 310, and the driving module 310 is configured to adjust the switching frequency of the light-emitting power supply 200 according to the load of the display device 1.

[0047] Through this solution, the display device 1 of the present application can adjust the switching frequency of the light-emitting power source 200 under different load conditions, thereby achieving the purpose of reducing the power consumption of the display panel 100.

[0048] Specifically, in some embodiments of the present application, the driving module 310 includes a computing submodule 311 , a control submodule 312 , and a communication submodule 313 .

[0049] The calculation submodule 311 is configured to calculate the average screen brightness value of the current frame according to the light-emitting area and current load of the current frame of the display device 1. In some more specific examples, the calculation submodule 311 can use an on pixel ratio calculator (OPR), which can evaluate the energy consumption and display effect of the display device 1 according to the ratio of the pixels lit on the display device 1 to the total pixels, so as to send a signal to the control submodule 312 to determine the required switching frequency of the light-emitting power supply 200.

[0050] The control submodule 312 is configured to calculate the corresponding switching frequency gear according to the average screen brightness value of the current frame. In some more specific examples, the control submodule 312 can use a power frequency controller to adjust and control the switching frequency of the light-emitting power supply 200 through the power frequency controller, so as to ensure the stability and efficiency of the power supply of the display device 1.

[0051] It should be noted that, in some embodiments of the present application, the switching frequency may include a first gear, a second gear, a third gear, and a fourth gear. Figure 2As shown, in the first gear, the switching frequency is 1500Hz, corresponding to an average screen brightness value range of 75% to 100%; in the second gear, the switching frequency is 1200Hz, corresponding to an average screen brightness value range of 50% to 75%; in the third gear, the switching frequency is 800Hz, corresponding to an average screen brightness value range of 25% to 50%; in the fourth gear, the switching frequency is 500Hz, corresponding to an average screen brightness value range of 0% to 25%.

[0052] The communication submodule 313 is electrically connected to the control submodule 312, and the communication submodule 313 is configured to communicate between the control submodule 312 and the light-emitting power supply 200 through the I2C protocol. The I2C protocol uses a clock signal for synchronous communication, which can ensure the accuracy and reliability of data transmission.

[0053] In some embodiments of the present application, the light-emitting power supply 200 includes: a register 210, which is electrically connected to the control submodule 312, and the register 210 is configured to control the switching state and setting adjustment of the light-emitting power supply 200. The register 210 communicates with the communication submodule 313 through the I2C protocol.

[0054] In addition, in some embodiments of the present application, the display device 1 may further include a power management chip (PMIC) for supplying various forms of voltage or current to the display panel 100, the gate driver and the source driver, etc., or for controlling various types of voltage or current to be supplied to the power management chip. The display panel 100 is provided with voltage lines for providing various signals or voltages, and a light-emitting device and a transistor for driving the light-emitting device may also be provided in each sub-pixel. The light-emitting device provided in the sub-pixel may be an organic light-emitting diode (OLED), and in some embodiments, may also be a light-emitting diode (LED) or a micro light-emitting diode (μLED), etc.

[0055] Reference Figure 3 As shown, a light-emitting driving circuit in some embodiments of the present application is connected to a light-emitting power supply 200. The light-emitting driving circuit includes 7 transistors and a storage capacitor, i.e., a 7T1C structure. The storage capacitor is used to maintain the voltage of the gate node of the driving transistor.

[0056] It should be noted that the transistors used in the embodiments of the present application can be thin film transistors or field effect transistors or other devices with the same characteristics. Since the source and drain of the transistors used are symmetrical, there is no difference between the source and drain. In the embodiments of the present application, in order to distinguish the source and drain of the transistor, one of the poles is called the first pole, and the other pole is called the second pole. In addition, the gate of the transistor is called the control pole. In addition, according to the characteristics of the transistor, the transistor can be divided into N-type and P-type. The following embodiments are explained with N-type transistors. When an N-type transistor is used, the first pole is the source of the N-type transistor, and the second pole is the drain of the N-type transistor. When the gate inputs a high level, the source and drain are turned on, and the P-type is the opposite. It can be imagined that the use of P-type transistors is something that a technician in the field can easily think of without paying creative labor, so it is also within the scope of protection of the embodiments of the present application.

[0057] Among them, since the transistors used in the embodiments of the present application are all N-type transistors, the working level signal in the embodiments of the present application refers to a high level signal, and the non-working level signal is a low level signal.

[0058] In addition, the material of the active layer of the transistor used in the present application can be not only amorphous silicon material but also oxide material, and the present application does not limit this.

[0059] Specifically, in some embodiments of the present application, the light-emitting driving circuit includes:

[0060] The first transistor T1 is a driving transistor. The driving transistor may be electrically connected to a driving voltage line to receive a driving voltage VDD, or may be electrically connected to a data line to apply a data voltage through the data line.

[0061] The light emitting device is electrically connected to the first transistor, and includes an anode electrically connected to the first transistor and a cathode connected to a base voltage VSS.

[0062] The second transistor T2 is controlled by the scan signal SCAN(N) and is electrically connected to the first electrode (node ​​B) of the driving transistor.

[0063] The third transistor T3 is controlled by the scan signal SCAN(N) and is electrically connected to the control electrode (node ​​A) and the second electrode (node ​​C) of the driving transistor. Specifically, the first electrode of the third transistor is connected to the node A, and the second electrode of the third transistor is connected to the node C. The third transistor T3 can control the threshold voltage Vth of the driving transistor to process the data voltage Vdata and apply the voltage obtained to the gate node of the driving transistor.

[0064] The fourth transistor T4 is controlled by the scan signal SCAN(N-1) and is electrically connected to the control electrode of the driving transistor and the initialization voltage line. The fourth transistor T4 can be used to initialize the voltage of the gate node of the driving transistor.

[0065] The fifth transistor T5 is controlled by the scan signal EM and is electrically connected to the first electrode (node ​​B) of the driving transistor and the driving voltage line.

[0066] The sixth transistor T6 is controlled by the scan signal EM and electrically connects the second electrode of the driving transistor and the light emitting device. The sixth transistor T6 can control the light emitting time of the light emitting device ED.

[0067] The seventh transistor T7 is controlled by the scan signal SCAN(N) and electrically connects the anode of the light emitting device ED and the initialization voltage line IVL. The seventh transistor T7 can be used to initialize the voltage of the anode of the light emitting device.

[0068] In the above-mentioned light emitting driving circuit, its driving period is divided into an initialization period, a data writing period and a light emitting period during a single image frame cycle.

[0069] During initialization, a scan signal SCAN(N-1) having a low level may be provided to the subpixel SP, thereby turning on the fourth transistor T4. As the second transistor T4 is turned on, the initialization voltage Vi may be applied to the gate node of the driving transistor.

[0070] After the initialization is completed, during the data writing period, a scan signal SCAN(N-1) having a high level and a scan signal SCAN(N) having a low level may be provided to the sub-pixel SP. This allows the fourth transistor T4 to be turned off, while the third transistor T3, the second transistor T2, and the seventh transistor T7 may be turned on. As the third transistor T3 is turned on, the control electrode and the second electrode of the driving transistor are electrically connected, and at the same time, the data voltage Vdata may be applied to the control electrode, i.e., the gate node, of the driving transistor through the driving transistor and the third transistor T3. At this time, a voltage obtained by reflecting the threshold voltage Vth of the driving transistor to the data voltage Vdata may be applied to the gate node of the driving transistor, so that compensation for the threshold voltage of the driving transistor may be performed.

[0071] In addition, as the seventh transistor T7 is turned on during the data writing period, the anode of the light emitting device can be initialized by the initialization voltage Vi. That is, during the data writing period, the operation of applying a voltage to the gate node of the driving transistor and the operation of initializing the anode of the light emitting device can be performed simultaneously.

[0072] During the light emission period, the scan signal SCAN(N-1) having a high level and the scan signal SCAN(N) having a high level may be provided to the sub-pixel, and the scan signal EM having a low level may be provided to the sub-pixel. Therefore, the third transistor T3, the second transistor T2, and the seventh transistor T7 may be turned off, and the fifth transistor T5 and the sixth transistor T6 may be turned on.

[0073] As the fifth transistor T5 is turned on, the driving voltage Vdd can be provided to the first electrode of the driving transistor, and a voltage difference between the control electrode and the first electrode of the driving transistor can be generated by the data voltage Vdata and the driving voltage Vdd, so that a current responsive to the data voltage Vdata can flow through the driving transistor.

[0074] As the sixth transistor T6 is turned on, a current in response to the data voltage Vdata may be supplied to the light emitting device, and the light emitting device may exhibit a light emission intensity corresponding to the data voltage Vdata.

[0075] In the above-mentioned light-emitting driving circuit, the display device 1 of the present application can adjust VDD and VSS under different load conditions, thereby reducing the power consumption of the display device 1. It should be noted that the display device 1 of the present application can also adjust AVDD, TCON_VCC, Source_VCC, etc., thereby reducing the power consumption of the display device 1.

[0076] According to a second aspect of the present application, the present application further provides a method for driving a display device 1, comprising:

[0077] S1: Obtaining the light emitting area and current load of the display device 1 in the current frame;

[0078] Specifically, in this step, obtaining the current light emitting area of ​​the display device 1 includes:

[0079] Obtaining the total number of pixels of the display device 1;

[0080] Count the number of pixels in the current frame image that are lit;

[0081] The number of pixels in the lit state is divided by the total number of pixels to obtain the lit pixel ratio;

[0082] The luminous area is obtained by multiplying the ratio of lit pixels by the total luminous area of ​​the display device 1 .

[0083] S2: Calculate the average brightness of the current frame based on the luminous area and current load;

[0084] Specifically, in this step, calculating the average picture brightness of the current frame according to the light-emitting area and the current load includes:

[0085] Calculate the sum of all pixel brightness values ​​in the current frame image;

[0086] Determine the total number of pixels of the current frame image;

[0087] Calculate the average screen brightness value according to the sum of pixel brightness values ​​and the total number of pixels;

[0088] Convert the average screen brightness value to the average screen brightness in percentage form.

[0089] S3: Calculate the target switching frequency level according to the average picture brightness of the current frame;

[0090] Reference Figure 2 As shown, in some embodiments, the target switch position may include:

[0091] First gear: the switching frequency is 1500Hz, corresponding to the average screen brightness value range of 75% to 100%;

[0092] The second gear: the switching frequency is 1200Hz, corresponding to the average screen brightness value range of 50% to 75%;

[0093] The third gear: the switching frequency is 800Hz, corresponding to the average screen brightness range of 25% to 50%;

[0094] The fourth gear: the switching frequency is 500Hz, corresponding to the average screen brightness value range of 0% to 25%.

[0095] S4: Control the light emitting power source 200 of the display device 1 to a target switching frequency level.

[0096] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A display device, characterized in that: include: Display panel; A light-emitting power source, electrically connected to the display panel; as well as A timing controller, electrically connected to the light-emitting power source; Wherein, the timing controller comprises a driving module, and the driving module is configured to adjust the switching frequency of the light-emitting power supply according to the load of the display device.

2. The display device according to claim 1, characterized in that The driving module comprises: The calculation submodule is configured to calculate the average picture brightness value of the current frame according to the light-emitting area and current load of the display device in the current frame.

3. The display device according to claim 2, characterized in that: The driving module further includes: The control submodule is configured to calculate the corresponding switching frequency gear according to the average picture brightness value of the current frame.

4. The display device according to claim 3, characterized in that: The switching frequency gears include a first gear, a second gear, a third gear and a fourth gear.

5. The display device according to claim 4, characterized in that: In the first gear, the switching frequency is 1500 Hz, corresponding to the average screen brightness value range of 75% to 100%; In the second gear, the switching frequency is 1200 Hz, corresponding to the average screen brightness value range of 50% to 75%; In the third gear, the switching frequency is 800 Hz, corresponding to the average screen brightness value range of 25% to 50%; In the fourth gear, the switching frequency is 500 Hz, corresponding to the average screen brightness value range of 0% to 25%.

6. The display device according to claim 5, characterized in that: The light emitting power source comprises: A register is electrically connected to the control submodule, and the register is configured to control the switch state and setting adjustment of the light-emitting power supply.

7. The display device according to claim 6, characterized in that: The driving module also includes: The communication submodule is electrically connected to the control submodule, and the communication submodule is configured to communicate between the control submodule and the register via an I2C protocol.

8. A method for driving a display device, characterized in that: include: Obtaining the light emitting area and current load of the display device in the current frame; Calculate the average picture brightness of the current frame according to the light-emitting area and the current load; Calculating the target switching frequency level according to the average picture brightness of the current frame; The light emitting power source of the display device is controlled to be at the target switching frequency level.

9. The driving method according to claim 8, characterized in that: Acquiring the current light emitting area of ​​the display device includes: Get the total number of pixels of the display device; Count the number of pixels in the current frame image that are lit; Dividing the number of pixels in the lit state by the total number of pixels to obtain a lit pixel ratio; The light-emitting area is obtained according to the product of the ratio of the lighted pixels and the total light-emitting area of ​​the display device.

10. The driving method according to claim 9, characterized in that: Calculating the average picture brightness of the current frame according to the light emitting area and the current load comprises: Calculate the sum of all pixel brightness values ​​in the current frame image; Determine the total number of pixels of the current frame image; Calculating an average picture brightness value according to the sum of the pixel brightness values ​​and the total number of pixels; The average screen brightness value is converted into an average screen brightness in percentage form.

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