TWI796870B - Display device and driving method thereof - Google Patents

Abstract

A display device and a driving method thereof. The display device includes a display module, a backlight module, and a circuit board. The display module includes a display pixel array and a display driver circuit. A backlight module includes a backlight pixel array and a backlight driver circuit. The circuit board includes an integrated circuit coupled to the display driver circuit and the backlight driver circuit. The integrated circuit provides a first image frame and a second image frame having a same resolution to the display driver circuit and the backlight driver circuit, respectively. The display driver circuit drives the display pixel array to display an image according to the first image frame. The backlight driver circuit drives the backlight pixel array to generate an imaged backlight for the display pixel array according to the second image frame.

Description

Display device and driving method thereof

The present invention relates to a display device, and in particular to a display device including a backlight module and a driving method thereof.

Early direct-lit backlight panels were bulky and heavy, so light guide strips and side light were often used to provide backlight to the display panel. However, the side light can only simply control the brightness and darkness of the backlight, and cannot provide different backlight effects corresponding to different areas in the displayed image. In addition, the design of passive backlight requires a large number of driving circuits, and the operating frequency of the driving circuit is within the frequency range acceptable to the human ear, and its internal IC (Integrated Circuit, IC) subsidiary Parts are prone to audio interference, so corresponding inductance is needed to assist in boosting (booster), and it will also cause interference with the position of the system magnet to generate audio noise (noise). Therefore, there are problems such as difficult design, high demand for driving circuits, complex wiring, large demand for power supply, and large printed circuit board (PCB) area.

Nowadays, with the technological evolution of light-emitting elements, the size of light-emitting elements is gradually shrinking, and sub-millimeter light-emitting diodes (Mini Light-Emitting Diode, Mini LED) can now be applied to a variety of different display fields, and even micro LEDs can be used in the future. Light-emitting diodes (Micro LEDs) or other light-emitting components are used in backlight circuits. Therefore, how to design an active backlight circuit that can produce different backlight effects corresponding to displayed images is one of the goals that those skilled in the art should devote to.

In view of this, the present invention proposes a display device and a driving method thereof, which can generate an imaging backlight corresponding to a displayed image.

In an embodiment of the present invention, the display device includes a display module, a backlight module and a circuit board. The display module includes a display pixel array and a display driving circuit. The backlight module includes a backlight pixel array and a backlight driving circuit. The circuit board includes an integrated circuit coupled to the display driving circuit and the backlight driving circuit. The integrated circuit provides the first image frame and the second image frame with the same resolution to the display driving circuit and the backlight driving circuit respectively. The display driving circuit drives the display pixel array to display images according to the first image frame. The backlight driving circuit drives the backlight pixel array according to the second image frame to generate image backlight for the display pixel array.

In an embodiment of the present invention, the driving method of the display device includes: configuring a display driving circuit on a display module having a display pixel array; configuring a backlight driving circuit on a backlight module having a backlight pixel array; The circuit provides the first image frame and the second image frame with the same resolution to the display driving circuit and the backlight driving circuit respectively; the display driving circuit drives the display pixel array to display images according to the first image frame; and the backlight driving circuit according to The second image frame drives the backlight pixel array to generate an imaged backlight for the display pixel array.

Based on the above, the display device described in the embodiments of the present invention can provide the first image frame and the second image frame with the same resolution to the display driving circuit in the display module and the backlight module respectively through the integrated circuit. backlight drive circuit. The display driving circuit is used to drive the display pixel array according to the first image frame to display images, and the backlight driving circuit is used to drive the backlight pixel array according to the second image frame to generate image backlight for the display pixel array. In this way, images can be displayed correspondingly to produce different backlight effects.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

The term "coupled (or connected)" used throughout the specification of this case (including the patent claims) may refer to any direct or indirect means of connection. For example, if it is described in the text that a first device is coupled (or connected) to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be connected to the second device through other devices or certain A connection means indirectly connected to the second device. The terms "first" and "second" mentioned in the entire description of this case (including the scope of the patent application) are used to name elements (elements), or to distinguish different embodiments or ranges, and are not used to limit the number of elements The upper or lower limit of , nor is it used to limit the order of the elements. In addition, wherever possible, elements/components/steps using the same reference numerals in the drawings and embodiments represent the same or similar parts. Elements/components/steps using the same symbols or using the same terms in different embodiments can refer to related descriptions.

FIG. 1 is a schematic diagram of a circuit block of a display device 100 according to an embodiment of the invention. In the embodiment shown in FIG. 1 , the display device 100 includes a display module 110 , a backlight module 120 and a circuit board 130 . The display module 110 may include a display pixel array 111 and a display driving circuit 112 . The display driving circuit 112 can be coupled to the display pixel array 111 and used to drive the display pixel array 111 . The display pixel array 111 may include one or more pixel circuits for displaying an image IMG. The backlight module 120 may include a backlight pixel array 121 and a backlight driving circuit 122 . The backlight driving circuit 122 can be coupled to the backlight pixel array 121 and used to drive the backlight pixel array 121 . The backlight pixel array 121 may include one or more pixel circuits for generating an imaged backlight IBL for the display pixel array 111 . Wherein, any pixel circuit in the display pixel array 111 may include a liquid crystal capacitor (liquid crystal capacitor), a thin film transistor (Thin Film Transistor, TFT) and (or) other pixel circuit elements, and any pixel circuit in the backlight pixel array 121 A pixel circuit may include light emitting elements, thin film transistors and/or other pixel circuit components. According to an actual design, the light emitting element may include a light emitting diode (Light Emitting Diode, LED), a submillimeter light emitting diode, a micro light emitting diode and (or) other light emitting elements. The quantity, type and arrangement of each pixel circuit can be determined according to the actual design/application, which is not limited in this embodiment.

In this embodiment, the circuit board 130 may include an integrated circuit (Integrated Circuit, IC) 131 . The integrated circuit 131 can be coupled to the display driving circuit 112 in the display module 110 and the backlight driving circuit 122 in the backlight module 120 . The integrated circuit 131 can generate the first image frame F1 and the second image frame F2 to the display driving circuit 112 and the backlight driving circuit 122 respectively. In some embodiments, the first image frame F1 and the second image frame F2 may have the same resolution or be the same image frame.

FIG. 2 is a schematic flowchart of a driving method of a display device according to an embodiment of the invention. For the display device 100 shown in FIG. 1 , reference may be made to related descriptions in FIG. 2 . Please refer to Figure 1 and Figure 2 at the same time. In step S210 , the display driving circuit 112 may be configured in the display module 110 having the display pixel array 111 . In step S220 , the backlight driving circuit 122 may be configured in the backlight module 120 having the backlight pixel array 121 . In step S230 , the integrated circuit 131 can provide the first image frame F1 and the second image frame F2 with the same resolution to the display driving circuit 112 and the backlight driving circuit 122 respectively. In step S240 , the display driving circuit 112 can drive the display pixel array 111 to display the image IMG according to the first image frame F1 . In step S250 , the backlight driving circuit 122 can drive the backlight pixel array 121 according to the second image frame F2 to generate an imaged backlight IBL for the display pixel array 111 .

Generally speaking, in order to drive the display module 110 and the backlight module 120, the circuit board 130 must include a timing controller (Timing Controller, TCON), an LED driver array (LED driver array), and a power management integrated circuit (Power Management IC). , PMIC) and other components, and use a bridge integrated circuit (bridge IC) for connection, but has problems such as complex design and large area. In this embodiment, according to the actual design requirements, the display device 100 can use a source driver (source driver) or a timing control embedded driver (TCON Embedded Driver, TED ) are disposed in the display driving circuit 112 and the backlight driving circuit 122, so as to reduce the total number of components and the area of the circuit board 130, and also reduce the total power consumption of the system. For example, in some embodiments, the integrated circuit 131 can simultaneously transmit multiple image frames (such as the first image frame F1 and the second image frame F2 ) through a single embedded display port (Embedded Display Port, eDP port), so It can reduce the display lag (lag) that may be caused by using different transmission ports to transmit image frames.

For example, FIG. 3 is a schematic circuit block diagram of a display device 300 according to another embodiment of the present invention. In the embodiment shown in FIG. 3 , the display device 300 includes a display module 110 , a backlight module 120 and a circuit board 130 . The display module 110 , the backlight module 120 and the circuit board 130 shown in FIG. 3 can be analogized with reference to the related descriptions of the display module 110 , the backlight module 120 and the circuit board 130 shown in FIG. 1 . The difference from the embodiment shown in FIG. 1 is that in this embodiment, the display driving circuit 112 may include a first source driver 113, the backlight driving circuit 122 may include a second source driver 123, and the integrated circuit 131 may include timing controller 132 . In some embodiments, the display driving circuit 112, the backlight driving circuit 122 and (or) the integrated circuit 131 shown in FIG. An example implementation of the circuit 131.

According to actual design requirements, the timing controller 132 may be a central processing unit (Central Processing Unit, CPU), a microcontroller unit (Microcontroller Unit, MCU), a digital signal processor (Digital Signal Processor, DSP), a programmable Controller (Programmable Logic Controller, PLC), Digital Signal Processor (Digital Signal Processor, DSP), Application Specific Integrated Circuits (ASIC), Programmable Logic Device (Programmable Logic Device, PLD) or others Similar devices or combinations of these devices. In other embodiments, the timing controller 132 can also realize various operating functions in the form of hardware circuits, and its detailed steps and implementation methods can obtain sufficient teachings, suggestions and implementation instructions from common knowledge in the technical field, and hereby No longer.

In this embodiment, the timing controller 132 can be used to transmit the first image frame F1 and the second image frame F2. The first source driver 113 can be coupled to the timing controller 132 to receive the first image frame F1, and drive the display pixel array 111 to display the image IMG according to the first image frame F1. The second source driver 123 can be coupled to the timing controller 132 to receive the second image frame F2 and drive the backlight pixel array 121 according to the second image frame F2 to generate an imaged backlight IBL for the display pixel array 111 .

In some embodiments, the timing controller 132 can perform image cutting and image frame synchronization. Alternatively, in some other embodiments, the timing controller 132 may also control the first source driver 113 and the second source driver 123 to be synchronized through an additional synchronization port. In some embodiments, the timing controller 132 may have a high bandwidth to support simultaneous transmission of two full high definition (Full High Definition, FHD) resolution image frames (eg, the first image frame F1 and the second image frame F2 ). Or in some other embodiments, the timing controller 132 may have a low bandwidth and support a display stream compression (Display Stream Compression, DSC) function conforming to the Video Electronics Standards Association (VESA) specification, so as to pass through the low bandwidth The compressed image frames (such as the first image frame F1 and the second image frame F2 ) are transmitted, and the compressed and restored display images can have characteristics of no distortion and low delay.

In this way, after the backlight driving circuit 122 receives the second image frame F2 having the same resolution as the first image frame F1, it can drive the backlight pixel array 121 to generate an area backlight corresponding to the image IMG (imaging backlight IBL). for brightness compensation. For example, the contrast ratio can be increased so that the input image frame (eg, the first image frame F1, the second image frame F2) is not a high dynamic range (High Dynamic Range, HDR), for example, a standard dynamic range (Standard Dynamic Range , SDR), it can create a high dynamic range visual effect. In addition, disposing the first source driving circuit 113 and the second source driving circuit 123 on the display module 110 and the backlight module 120 respectively can greatly reduce the cost and area of components on the circuit board 130 .

As another example, FIG. 4 is a schematic circuit block diagram of a display device 400 according to yet another embodiment of the present invention. In the embodiment shown in FIG. 4 , the display device 400 includes a display module 110 , a backlight module 120 and a circuit board 130 . The display module 110 , the backlight module 120 and the circuit board 130 shown in FIG. 4 can be analogized with reference to the related descriptions of the display module 110 , the backlight module 120 and the circuit board 130 shown in FIG. 1 . The difference from the embodiment shown in FIG. 1 and FIG. 3 is that in this embodiment, the display driving circuit 112 may include a first timing control embedded driver 114, and the backlight driving circuit 122 may include a second timing controlling embedded driver 124. The integrated circuit 131 may include a scaling integrated circuit (Scaler IC) or a graphics processor (Graphics Processing Unit, GPU) 133 or other types of image processing circuits. For example, in some embodiments, when the display device 400 is used as a product such as a display, the integrated circuit 131 may include a scaling integrated circuit 133; and when the display device 400 is used as a laptop or an All-In-One (AIO) For products such as computers, the integrated circuit 131 may include a graphics processor 133 , which is not limited in this embodiment. In some embodiments, the display driving circuit 112, the backlight driving circuit 122 and (or) the integrated circuit 131 shown in FIG. An example implementation of the circuit 131.

In this embodiment, the scaling IC or the graphics processor 133 can be used to generate the first image frame F1 and the second image frame F2. The first timing control embedded driver 114 can be coupled to the integrated circuit 131 to receive the first image frame F1, and drive the display pixel array 111 to display the image IMG according to the first image frame F1. The second timing control embedded driver 124 can be coupled to the integrated circuit 131 to receive the second image frame F2 and drive the backlight pixel array 121 according to the second image frame F2 to generate an imaged backlight IBL for the display pixel array 111 . In some embodiments, scaling IC or GPU 133 may perform image scaling and image frame synchronization. In this way, by using the first timing control embedded driver 114 and the second timing control embedded driver 124 respectively, the cost and area of components on the circuit board 130 can be greatly reduced. In addition, in some embodiments, the power supply circuits required by the display module 110 and (or) the backlight module 120 can be configured on the circuit board 130 at the same time, so as to reduce the display module 110 and (or) the backlight module 120 area of the border.

FIG. 5 is a schematic circuit diagram of a display module 510 according to an embodiment of the invention. In the embodiment shown in FIG. 5 , the display module 510 includes a display pixel array 511 and a display driving circuit 112 . For the display driving circuit 112 shown in FIG. 5 , reference may be made to the relevant descriptions of the display driving circuit 112 shown in FIG. 1 , the display driving circuit 112 shown in FIG. 3 , or the display driving circuit 112 shown in FIG. 4 , and details are not repeated here. The display pixel array 511 may include one or more pixel circuits (such as the pixel circuit 111_1 in the figure) coupled to the display driving circuit 112 . The display pixel array 511 shown in FIG. 5 can be used as an implementation example of the display pixel array 111 shown in FIG. 1 , the display pixel array 111 shown in FIG. 3 and (or) the display pixel array 111 shown in FIG. 4 .

In this embodiment, the pixel circuit 111_1 may include a switch T1 and a liquid crystal capacitor LC. The switch T1 may be an N-type transistor, but this embodiment is not limited thereto. In this embodiment, the switch T1 may have a first terminal (for example, a source terminal) coupled to the display driving circuit 112 , for example, may be connected through the data line DL in the figure. In some embodiments, the control terminal (eg gate terminal) of the switch T1 can be coupled to the scan line GL. In this embodiment, the liquid crystal capacitor LC may have a first terminal coupled to a second terminal (eg, a drain terminal) of the switch T1 , and the second terminal of the liquid crystal capacitor LC may receive the common voltage Vcom. The common voltage Vcom can be a DC level, a ground level or other voltage levels. In some embodiments, the pixel circuit 111_1 may further include a capacitor Cst coupled between the second terminal of the switch T1 and the common voltage Vcom. Then in this embodiment, when the scan line GL turns on the switch T1, the capacitor Cst can receive and store the charge (data) on the data line DL through the switch T1, and the liquid crystal capacitor LC can receive the charge and display an image, for example, it can display gray The step value is 0 to 255 steps, which is not limited in this embodiment.

According to actual design requirements, in some embodiments, the display pixel array (such as the display pixel array 111 shown in FIG. 1, the display pixel array 111 shown in FIG. 3, the display pixel array 111 shown in FIG. display pixel array 511) and the backlight pixel array (such as the backlight pixel array 121 shown in FIG. 1, the backlight pixel array 121 shown in FIG. 3, and (or) the backlight pixel array 121 shown in FIG. One-to-one correspondence. For example, FIG. 6 is a schematic circuit diagram of a backlight module 620 according to an embodiment of the present invention. In the embodiment shown in FIG. 6 , the backlight module 620 includes a backlight pixel array 621 and a backlight driving circuit 122 . For the backlight driving circuit 122 shown in FIG. 6 , reference may be made to the relevant descriptions of the backlight driving circuit 122 shown in FIG. 1 , the backlight driving circuit 122 shown in FIG. 3 , or the backlight driving circuit 122 shown in FIG. 4 , and details are not repeated here. The backlight pixel array 621 may include one or more pixel circuits (such as the pixel circuit 121_1 in the figure) coupled to the backlight driving circuit 122 . The backlight pixel array 621 shown in FIG. 6 can be used as an implementation example of the backlight pixel array 121 shown in FIG. 1 , the backlight pixel array 121 shown in FIG. 3 and (or) the backlight pixel array 121 shown in FIG. 4 .

In this embodiment, the pixel circuit 121_1 may include a switch T2, a first transistor T3 and a light emitting element L1. The switch T2 may be an N-type transistor, but this embodiment is not limited thereto. In this embodiment, the switch T2 may have a first terminal (for example, a source terminal) coupled to the backlight driving circuit 122 , for example, may be connected through the data line DL in the figure. In some embodiments, the control terminal (eg gate terminal) of the switch T2 may be coupled to one or more scan lines GL. For example, in this embodiment, the control terminal of the switch T2 can be coupled to the scanning line G1, the scanning line G2 and the scanning line G3 at the same time, so that the pixel circuits (such as 121_1) in the backlight pixel array 621 can use multiple pairs One way corresponds to one or more pixel circuits in the display pixel array (not shown, refer to the display pixel array 111 in the embodiment shown in FIG. 1 , FIG. 3 or FIG. 4 ). For example, in this embodiment, the backlight pixel array 621 corresponds to the display pixel array in a 1:3 manner. According to the actual design/application, other corresponding methods (such as connecting different numbers of data lines and/or scanning lines or spaced connections) can also be used in other embodiments, which is not limited in this embodiment.

In this embodiment, the first transistor T3 may have a control terminal (such as a gate terminal) coupled to the second terminal (such as a drain terminal) of the switch T2, and the first terminal (such as a source terminal) of the first transistor T3 may be Receive the first voltage Vdd. The light emitting element L1 may have a first end coupled to a second end (eg drain end) of the first transistor T3, and the second end of the light emitting element L1 may receive the second voltage Vss. Wherein the first voltage Vdd can be a DC high level with a stable current, and the second voltage Vss can be a DC low level, but this embodiment is not limited thereto. Then in this embodiment, when any one of the scanning lines G1-G3 turns on the switch T2, the first transistor T3 can determine the switching time of the gate according to the data (such as voltage) on the data line DL through the switch T2 , that is, the duty cycle of the first transistor T3 to control the magnitude of the current flowing through the light-emitting element L1 , and then control the light-emitting element L1 to generate an imaging backlight and simultaneously control the brightness of the backlight.

In some embodiments, the pixel circuit 121_1 may further include a capacitor C1. The capacitor C1 may have a first terminal coupled to the control terminal of the first transistor T3, and a second terminal of the capacitor C1 may receive the reference voltage Vref. In some embodiments, the pixel circuit 121_1 may further include a second transistor T4. The second transistor T4 may have a first terminal (eg, a source terminal) for receiving the first voltage Vdd, and a second terminal (eg, a drain terminal) of the second transistor T4 may be coupled to the first terminal of the light emitting element L1 . In this embodiment, the control terminal (eg gate terminal) of the second transistor T4 can receive a pulse-width modulation (Pulse-Width Modulation) signal PWM. The pulse width modulation signal PWM can be generated by the backlight driving circuit 122, or by the circuit board 130 in the embodiment shown in FIG. 1, FIG. 3 or FIG. 4, or other system units not shown in the figure. No limit. Then in this embodiment, when the pulse width modulation signal PWM turns on the second transistor T4, the second transistor T4 can directly control the magnitude of the current flowing through the light emitting element L1 according to the duty cycle of the pulse width modulation signal PWM, Furthermore, the light-emitting element L1 can be directly controlled to generate the imaging backlight without going through the switch T1 and the first transistor T3 , and at the same time, the brightness of the backlight can be controlled.

For example, in some embodiments, when the display device with the backlight pixel array 621 operates in the standard dynamic range mode, the backlight driving circuit 122 or the system (not shown) may turn off the first transistor T3 and pass through the pulse width The modulation signal PWM turns on the second transistor T4, so that the second transistor T4 can provide a global dimming driving current to the light emitting element L1 based on the first voltage Vdd and the second voltage Vss. In some embodiments, when the display device operates in the analog high dynamic range mode, the backlight driving circuit 122 or the system can turn off the second transistor T4 through the pulse width modulation signal PWM, so that the first transistor T3 can be switched on through the switch T2 When turned on, the local dimming driving current is provided to the light emitting element L1 based on the first voltage Vdd and the second voltage Vss. In this way, the backlight pixel array 621 can correspond to different image display modes, by controlling the conduction state of the first transistor T3 and the second transistor T4 to drive the light-emitting element L1 to generate backlight, so as to provide different image-based backlights to display pixel units.

For another example, FIG. 7A is a schematic circuit diagram of a backlight module 720 according to another embodiment of the present invention. FIG. 7B is a schematic diagram illustrating operation waveforms of the backlight module 720 shown in FIG. 7A according to an embodiment of the present invention. Please refer to FIG. 7A and FIG. 7B at the same time. In the embodiment shown in FIG. 7A , the backlight module 720 includes a backlight pixel array 721 and a backlight driving circuit 122 . For the backlight driving circuit 122 shown in FIG. 7A , reference may be made to the relevant descriptions of the backlight driving circuit 122 shown in FIG. 1 , the backlight driving circuit 122 shown in FIG. 3 , or the backlight driving circuit 122 shown in FIG. 4 , and details are not repeated here. The backlight pixel array 721 may include a plurality of pixel circuits (such as pixel circuit 121_1, pixel circuit 121_2, pixel circuit 121_3, pixel circuit 121_4, pixel circuit 121_5 and pixel circuit 121_6 in the figure) through one or more data lines (such as in the figure The data line DL1 , the data line DL2 , the data line DL3 and the data line DL4 ) are coupled to the backlight driving circuit 122 . Any one of the pixel circuits 121_1 - 121_6 shown in FIG. 7A can be deduced by referring to the relevant description of the pixel circuit 121_1 shown in FIG. 6 , and will not be repeated here. The backlight pixel array 721 shown in FIG. 7A can be used as an implementation example of the backlight pixel array 121 shown in FIG. 1 , the backlight pixel array 121 shown in FIG. 3 and (or) the backlight pixel array 121 shown in FIG. 4 .

In this embodiment, the pixel circuits 121_1 and 121_2 can be coupled to the scan line G1, the scan line G2 and the scan line G3 at the same time, and the pixel circuits 121_3 and 121_4 can be coupled to the scan line G4, the scan line G5 and the scan line G6 at the same time, The pixel circuits 121_5 and 121_6 can be coupled to the scan line G3n+1, the scan line G3n+2 and the scan line G3n+3 at the same time. In this embodiment, the pixel circuits 121_1 and 121_5 can be coupled to the data line DL1 at the same time, the pixel circuit 121_3 can be coupled to the data line DL2, the pixel circuits 121_2 and 121_6 can be coupled to the data line DL3 at the same time, and the pixel circuit 121_4 can be coupled to the data line DL3. Connect to data line DL4. The data lines DL1-DL4 can transmit data (such as the data DT shown in FIG. The display pixel array (not shown, refer to the display pixel array 111 in the embodiment shown in FIG. 1 , FIG. 3 or FIG. 4 ) generates a local backlight. In this embodiment, the backlight can be achieved by coupling the six pixel circuits 121_1-121_6 to the nine scan lines G1-G6, G3n+1-G3n+3 and the four data lines DL1-DL4 respectively. The pixel array 721 corresponds to the display pixel array in a ratio of 1:6. According to actual design/application, other corresponding manners may also be adopted in other embodiments, and this embodiment is not limited thereto.

In some embodiments, the operation waveform diagram of the backlight pixel array 721 shown in FIG. 7A can refer to FIG. 7B . In the embodiment shown in FIG. 7B , it is assumed that the display device receives the image frame FM1 , the image frame FM2 , the image frame FM3 and the image frame FM4 in time sequence. It is also assumed that the display device intends to use the high dynamic range mode to display the image frames FM1 , FM3 , and FM4 , and to use the standard dynamic range mode to display the image frame FM2 . Then in the high dynamic range mode (displaying image frames FM1, FM3 or FM4), the pulse width modulation signal PWM can maintain the first logic level (for example, a logic low level), so that the pixel circuits 121_1-121_n can follow the scanning line G1 ~G6, G3n+1~G3n+3 are turned on in sequence. For example, when the scan lines G1-G3 are sequentially switched from the first logic level to the second logic level (such as a high logic level), the pixel circuits 121_1 and 121_2 shown in FIG. The data transmitted on the lines DL1 and DL3 (for example, the data DT shown in FIG. 7B ) is used to generate a video backlight (local dimming) with a lighting level LL, and other pixel circuits 121_3 - 121_6 can be deduced by analogy. In the standard dynamic range mode (display image frame FM2), the pulse width modulation signal PWM can be switched from the first logic level to the second logic level, and its duty cycle can be controlled, so that the pixel circuits 121_1~121_6 can simultaneously follow the Pulse width modulation signal PWM to generate video backlight with luminance LL (global dimming).

For example, FIG. 8 is a schematic flowchart of a driving method of a display device according to another embodiment of the present invention. The display device 100 shown in FIG. 1 , the display device 300 shown in FIG. 3 , and (or) the display device 400 shown in FIG. 4 can be analogized with reference to the relevant description of FIG. 8 . Please refer to Figure 1 and Figure 8 at the same time. In step S810 , the integrated circuit 131 can provide the first image frame F1 and the second image frame F2 with the same resolution to the display driving circuit 112 and the backlight driving circuit 122 respectively. In step S820 , the integrated circuit 310 (for example, a timing controller or a graphics processor therein) can determine whether the format of the first image frame F1 and the second image frame F2 is a high dynamic range format according to the contents of the first image frame F1 and the second image frame F2 . When it is judged to be a high dynamic range format, it will enter step S830, and when it is judged to be a non-high dynamic range (for example, standard dynamic range) format, it will enter step S850. In step S830 , the backlight module 120 can generate an imaging backlight IBL (local dimming) according to the second image frame F2 in the high dynamic range mode. And in step S840, the integrated circuit 131 can perform image processing on the first image frame F1, such as enhancing color saturation, sharpness, panel color correction (Delta-ITP) and other actions, and the display module 110 can be based on the image The processed first image frame F1 is used to display the image IMG.

In step S850 , the display device 100 may preset or set by the user the maximum brightness of the imaging backlight IBL generated by the backlight module 120 in the standard dynamic range mode. For example, assuming that the maximum brightness of the image IMG displayed by the display module 110 is X, Y% can be set as the maximum brightness of the image backlight IBL generated by the backlight module 120 in the standard dynamic range mode. For example, in some embodiments, X can be 1000 nits, and Y can be 60, which means that the backlight module 120 can generate a maximum imaging backlight IBL of 600 nits. In step S860 , the display device 100 can be preset or selected by the user whether to simulate the high dynamic range visual effect according to the first image frame F1 and the second image frame F2 in the standard dynamic range format. When the display device 100 is selected to operate in the simulated high dynamic range mode, it will enter step S870, and when the display device 100 is selected to maintain the operation in the standard dynamic range mode, it will enter step S890.

尼特。在一些實施例中，當任一區域平均灰階值為255階時，可以設定影像化背光IBL的發光亮度等於預設或使用者設定的影像化背光IBL的最大亮度（例如為300尼特）。在一些實施例中，還可以預先設定或由使用者設定一個強度比例值，以增強實際影像呈現的對比度。例如，在一些實施例中，強度比例值可以設定為10%，則此時影像化背光IBL的最大亮度為

尼特。 In step S870 , the backlight module 120 can generate an imaging backlight IBL (local dimming) according to the second image frame F2 in the simulated high dynamic range mode. For example, in some embodiments, the integrated circuit 310 (such as the timing controller or graphics processor therein) can be preset or set by the user to correspond to a plurality of area ranges of the image IMG, and calculate the average gray area of each area. step value to calculate the backlight brightness that needs to be compensated for each area. For example, in some embodiments, it is assumed that the backlight module 120 is set to produce a maximum brightness of the imaging backlight IBL in the standard dynamic range mode to be 600 nits, and the user sets it to 300 nits in the simulated dynamic range mode and The average gray scale value of the area is 128 levels, then the relative brightness that the backlight module 120 needs to compensate at this time is

nit. In some embodiments, when the average grayscale value of any area is 255, the luminance of the imaging backlight IBL can be set equal to the preset or user-set maximum brightness of the imaging backlight IBL (for example, 300 nits). . In some embodiments, an intensity ratio value can also be preset or set by the user to enhance the contrast of the actual image presentation. For example, in some embodiments, the intensity ratio value can be set to 10%, then the maximum brightness of the imaging backlight IBL at this time is

nit.

In step S880, the integrated circuit 131 may perform image processing (such as color accuracy correction (Delta-E)) on the first image frame F1, and the display module 110 may perform image processing according to the image-processed first image frame F1. Display image IMG. In some embodiments, actions such as color accuracy correction can also be performed in combination with the image IMG and the image backlight IBL, which is not limited in this embodiment. In step S890 , the backlight module 120 can generate an imaging backlight IBL (global dimming) according to the pulse width modulation signal in the standard dynamic range mode. In step S800 , the integrated circuit 131 can perform image processing (such as color accuracy correction (Delta-E)) on the first image frame F1 , and the display module 110 can perform image processing according to the first image frame F1 after the image processing. Display image IMG.

FIG. 9 is a schematic circuit diagram of a backlight module 920 according to yet another embodiment of the present invention. In the embodiment shown in FIG. 9 , the backlight module 920 includes a backlight pixel array 721 and a backlight driving circuit 122 . For the backlight driving circuit 122 shown in FIG. 9 , reference may be made to the relevant descriptions of the backlight driving circuit 122 shown in FIG. 1 , the backlight driving circuit 122 shown in FIG. 3 , or the backlight driving circuit 122 shown in FIG. 4 , and details are not repeated here. The backlight pixel array 721 shown in FIG. 9 can be deduced by referring to the related description of the backlight pixel array 721 shown in FIG. 7A , and will not be repeated here. The difference from the embodiment shown in FIG. 7A is that the backlight module 920 shown in FIG. 9 may further include one or more switching circuits (such as the switching circuit M1, the switching circuit M2, the switching circuit M3, and the switching circuit M4 in the figure). . Each of the switching circuits M1 - M4 may have a common terminal to be respectively coupled to a plurality of data lines (eg, data lines DL1 - DL4 in the figure) in the backlight pixel array 720 . Each of the switching circuits M1 - M4 may have a plurality of selection terminals for one-to-one coupling to a plurality of data voltage output terminals of the backlight driving circuit 122 (eg, the data voltage output terminals DT1 - DT24 in the figure). The number of selection terminals and the data transmitted by the data voltage output terminals DT1 - DT24 can be determined according to actual design/application, and there is no limitation in this embodiment. The backlight module 920 shown in FIG. 9 can be used as an implementation example of the backlight module 120 shown in FIG. 1 , the backlight module 120 shown in FIG. 3 and (or) the backlight module 120 shown in FIG. 4 .

For example, in this embodiment, the switching circuits M1 and M2 are taken as an example. The common terminals of the switching circuits M1 and M2 can be respectively coupled to the data lines DL1 and DL2, the selection terminals of the switching circuit M1 can be coupled to the data voltage output terminals DT1-DT6 in a one-to-one manner, and the selection terminals of the switching circuit M2 can be coupled to a pair of One ground is coupled to the data voltage output terminals DT7-DT12. The data voltage output terminals DT1 - DT12 can respectively transmit continuous or discontinuous data corresponding to the same or different light emitting patterns (such as red, green, blue or other light emitting colors). For example, in some embodiments, the data voltage output terminals DT1, DT4, DT7, and DT10 can respectively transmit 4 consecutive data corresponding to the red light-emitting type, and the data voltage output terminals DT2, DT5, DT8, and DT11 can respectively transmit corresponding For the 4 pieces of continuous data whose luminescence type is green, the data voltage output terminals DT3 , DT6 , DT9 and DT12 can respectively transmit 4 pieces of continuous data corresponding to the luminescence type of blue. Or, in some other embodiments, assuming that there are 14 consecutive data corresponding to the red data, the data voltage output terminals DT1 and DT4 can transmit the first data and the second data respectively, and the data voltage output The terminals DT7 and DT10 can respectively transmit the fifth data and the sixth data after an interval of 4 data. The rest of the implementations of the data voltage output terminals and the switching circuits M3 - M4 can be deduced in the same way, and will not be repeated here. In this way, a corresponding ratio of 36:1 or higher between the backlight pixel array 721 and the display pixel array can be achieved.

To sum up, the display devices 100 , 300 , and 400 and their driving methods described in the embodiments of the present invention can provide the first image frame F1 and the second image frame F2 with the same resolution through the integrated circuit 131 respectively to The display driving circuit 112 in the display module and the backlight driving circuit 122 in the backlight module. The display driving circuit 112 drives the display pixel array according to the first image frame F1 to display the image IMG, and the backlight driving circuit 122 drives the backlight pixel array according to the second image frame F2 to generate an imaged backlight IBL for the display pixel array. In this way, not only can the design complexity, the number of components and the size of the circuit board 130 be reduced, but also the display devices 100, 300 and 400 can be operated in the standard dynamic range mode, the high dynamic range mode or the simulated high dynamic range mode by controlling the display device 130 to According to different operation modes, a global backlight or a local backlight is correspondingly generated to compensate the brightness of the displayed image IMG, thereby presenting a variety of different image effects.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention should be defined by the scope of the appended patent application.

100, 300, 400: display device 110, 510: display module 111, 511: display pixel array 112: Display drive circuit 113: The first source driver 114: The first timing control embedded driver 120, 620, 720, 920: backlight module 121, 621, 721: backlight pixel array 121_1～121_6: pixel circuit 122: Backlight drive circuit 123: Second source driver 124: The second timing control embedded driver 130: circuit board 131: Integrated circuit 132: Timing controller 133:Scaling ICs/GPUs C1, Cst: capacitance DL, DL1～DL4: data line DT: data DT1～DT24: data voltage output terminal F1, F2, FM1～FM4: image frame G1～G6, G3n+1, G3n+2, G3n+3, GL: scan line HDR: High Dynamic Range IBL: Imaging Backlight IMG: Image L1: light emitting element LC: liquid crystal capacitor LL: luminous brightness M1～M4: switching circuit PWM: pulse width modulation signal S210～S250, S800～S890: steps SDR: Standard Dynamic Range T1, T2: switch T3, T4: Transistor Vcom: common voltage Vdd, Vss: Voltage Vref: reference voltage

FIG. 1 is a schematic diagram of a circuit block of a display device according to an embodiment of the invention. FIG. 2 is a schematic flowchart of a driving method of a display device according to an embodiment of the invention. FIG. 3 is a schematic circuit block diagram of a display device according to another embodiment of the invention. FIG. 4 is a schematic circuit block diagram of a display device according to yet another embodiment of the present invention. FIG. 5 is a schematic circuit diagram of a display module according to an embodiment of the invention. FIG. 6 is a schematic circuit diagram of a backlight module according to an embodiment of the invention. FIG. 7A is a schematic circuit diagram of a backlight module according to another embodiment of the present invention. FIG. 7B is a schematic diagram illustrating operation waveforms of the backlight module shown in FIG. 7A according to an embodiment of the present invention. FIG. 8 is a schematic flowchart of a driving method of a display device according to another embodiment of the present invention. FIG. 9 is a schematic circuit diagram of a backlight module according to yet another embodiment of the present invention.

100: display device

110: Display module

111: display pixel array

112: Display drive circuit

120:Backlight module

121: backlight pixel array

122: Backlight drive circuit

130: circuit board

131: Integrated circuit

F1: the first image frame

F2: Second image frame

IBL: Imaging Backlight

IMG: Image

Claims (11)

A display device, comprising: a display module including a display pixel array and a display driving circuit, wherein the display driving circuit includes a first source driver; a backlight module including a backlight pixel array and a backlight driving circuit , wherein the backlight driving circuit includes a second source driver; and a circuit board, including an integrated circuit coupled to the display driving circuit and the backlight driving circuit, wherein the integrated circuit provides a A first image frame and a second image frame are provided to the display driving circuit and the backlight driving circuit respectively, the integrated circuit includes a timing controller, and the first source driver is coupled to the timing controller to receive the first an image frame, the first source driver drives the display pixel array to display an image according to the first image frame, the second source driver is coupled to the timing controller to receive the second image frame, and the second The source driver drives the backlight pixel array according to the second image frame to generate an imaged backlight for the display pixel array. A display device, comprising: a display module, including a display pixel array and a display driving circuit, wherein the display driving circuit includes a first timing control embedded driver; a backlight module, including a backlight pixel array and a a backlight driving circuit, wherein the backlight driving circuit includes a second timing control embedded driver; and a circuit board, including an integrated circuit coupled to the display driving circuit and the backlight A light drive circuit, wherein the integrated circuit provides a first image frame and a second image frame with the same resolution to the display drive circuit and the backlight drive circuit respectively, the integrated circuit includes a scaling integrated circuit or is a graphics processor, the first timing control embedded driver is coupled to the integrated circuit to receive the first image frame, the first timing control embedded driver drives the display pixel array according to the first image frame To display an image, the second timing control embedded driver is coupled to the integrated circuit to receive the second image frame, and the second timing control embedded driver drives the backlight pixel array according to the second image frame to generate An imaging backlight illuminates the display pixel array. The display device according to claim 2, wherein the first image frame and the second image frame are the same image frame. The display device as described in claim 2, wherein any pixel circuit of the display pixel array includes: a switch having a first end coupled to the display driving circuit; and a liquid crystal capacitor having a first end coupled to to a second end of the switch, wherein a second end of the liquid crystal capacitor receives a common voltage. A display device, comprising: a display module, including a display pixel array and a display driving circuit; a backlight module, including a backlight pixel array and a backlight driving circuit; and a circuit board, including an integrated circuit coupling to the display driving circuit and the backlight driving circuit, wherein the integrated circuit provides a first image frame and a The second image frame is respectively provided to the display drive circuit and the backlight drive circuit, the display drive circuit drives the display pixel array to display an image according to the first image frame, and the backlight drive circuit drives the backlight pixel according to the second image frame array to generate an imaging backlight to the display pixel array, and any pixel circuit of the backlight pixel array includes: a switch having a first end coupled to the backlight driving circuit, wherein a control end of the switch is coupled to A plurality of scanning lines; a first transistor with a control terminal coupled to a second terminal of the switch, wherein a first terminal of the first transistor receives a first voltage; and a light emitting element with a The first terminal is coupled to a second terminal of the first transistor, wherein a second terminal of the light emitting element receives a second voltage. The display device as described in claim 5, wherein any pixel circuit of the backlight pixel array further includes: a capacitor having a first terminal coupled to the control terminal of the first transistor, wherein a first terminal of the capacitor The two terminals receive a reference voltage. The display device as described in claim 5, wherein any pixel circuit of the backlight pixel array further includes: a second transistor having a first terminal receiving the first voltage, wherein a second transistor of the second transistor The terminal is coupled to the first terminal of the light-emitting element, and a control terminal of the second transistor receives a pulse width modulation signal. The display device as claimed in claim 7, wherein when the display device operates in a standard dynamic range mode, the first transistor is off and the second transistor is The body provides a global dimming driving current; when the display device operates in an analog high dynamic range mode, the second transistor is cut off and the first transistor provides a local dimming driving current to the light emitting element. A display device, comprising: a display module, including a display pixel array and a display driving circuit; a backlight module, including a backlight pixel array and a backlight driving circuit; and a circuit board, including an integrated circuit coupling To the display drive circuit and the backlight drive circuit, wherein the integrated circuit provides a first image frame and a second image frame with the same resolution to the display drive circuit and the backlight drive circuit respectively, the display drive circuit Driving the display pixel array according to the first image frame to display an image, the backlight driving circuit driving the backlight pixel array according to the second image frame to generate an imaging backlight for the display pixel array, and the backlight module further includes : a switching circuit, having a common terminal coupled to a data line of the backlight pixel array, wherein multiple selection terminals of the switching circuit are coupled one-to-one to multiple data voltage output terminals of the backlight driving circuit. A method for driving a display device, comprising: configuring a display driving circuit on a display module having a display pixel array, wherein the display driving circuit includes a first source driver; configuring a backlight driving circuit on a display module having a backlight pixel array A backlight module, wherein the backlight drive circuit includes a second source driver; an integrated circuit provides a first image frame with the same resolution and a The second image frame is respectively provided to the display driving circuit and the backlight driving circuit, wherein the integrated circuit includes a timing controller, the first source driver is coupled to the timing controller to receive the first image frame, and the first source driver is coupled to the timing controller to receive the first image frame. Two source drivers are coupled to the timing controller to receive the second image frame; the first source driver drives the display pixel array to display an image according to the first image frame; and the second source driver drives the display pixel array to display an image; The backlight pixel array is driven according to the second image frame to generate an imaging backlight for the display pixel array. A method for driving a display device, comprising: configuring a display driving circuit on a display module having a display pixel array, wherein the display driving circuit includes a first timing control embedded driver; configuring a backlight driving circuit on a display module having a display pixel array A backlight module of a backlight pixel array, wherein the backlight drive circuit includes a second timing control embedded driver; an integrated circuit provides a first image frame and a second image frame with the same resolution respectively for The display driving circuit and the backlight driving circuit, wherein the integrated circuit includes a scaling integrated circuit or a graphics processor, the first timing control embedded driver is coupled to the integrated circuit to receive the first image frame, and the second timing control embedded driver is coupled to the integrated circuit to receive the second image frame; the first timing control embedded driver drives the display pixel array according to the first image frame to display a image; and driving the backlight pixel array by the second timing control embedded driver according to the second image frame to generate an imaged backlight for the display pixel array.

Images