Display panel and driving method therefor, and display apparatus

Abstract

The present invention provides a display panel and a driving method therefor, and a display apparatus. The display panel comprises: a touch and display integrated circuit, a first power supply, and a second power supply. The touch and display integrated circuit comprises an analog driving circuit, and the analog driving circuit comprises a touch driving circuit configured to control the display panel to perform touch sensing and a display driving circuit configured to control the display panel to perform display; the first power supply is electrically connected to the touch driving circuit and the display driving circuit, and is configured to supply power to the touch driving circuit and the display driving circuit; the second power supply is electrically connected to the display driving circuit, and is configured to supply power to the display driving circuit; and the second power supply is further electrically connected to the touch driving circuit, and is further configured to supply power to the touch driving circuit. In the display pane, the size of the touch and display integrated circuit is reduced, and the cost of the touch and display integrated circuit is reduced.

Description

Display panel, driving method thereof, and display device Technical Field

[0001] This invention belongs to the field of display technology, and specifically relates to a display panel, its driving method, and a display device. Background Technology

[0002] With the continuous development of display technology, touch display devices have been widely used. Currently, the touch panel and display panel in touch display devices are controlled independently by two chips. In order to improve the integration of touch display devices, TDDI (Touch and Display Driver Integration) chips have emerged. Summary of the Invention

[0003] This invention provides a display panel, a driving method thereof, and a display device. This display panel not only reduces the size of the touch display integrated circuit but also lowers its cost.

[0004] This invention provides a display panel, comprising: a touch display integrated circuit, a first power supply, and a second power supply.

[0005] The touch display integrated circuit includes an analog driving circuit.

[0006] The analog driving circuit includes a touch driving circuit configured to control the display panel to perform touch sensing and a display driving circuit configured to control the display panel to perform display.

[0007] The first power supply is electrically connected to the touch driving circuit and the display driving circuit, and is configured to provide power to the touch driving circuit and the display driving circuit;

[0008] The second power supply is electrically connected to the display driving circuit and is configured to provide power to the display driving circuit;

[0009] The second power source is also electrically connected to the touch driving circuit and is configured to provide power to the touch driving circuit.

[0010] In some embodiments, a first switch is also included.

[0011] The first switch is electrically connected between the second power supply and the touch driving circuit and / or between the second power supply and the display driving circuit.

[0012] In some embodiments, a second switch is also included.

[0013] The second switch is electrically connected between the first power supply and the touch driving circuit and / or between the first power supply and the display driving circuit.

[0014] In some embodiments, the analog driving circuit further includes a shared circuit shared by the display driving circuit and the touch driving circuit.

[0015] The first power source is also electrically connected to the common circuit and configured to provide power to the common circuit.

[0016] In some embodiments, the touch driving circuit includes a back-end driving circuit configured to provide touch driving signals and a front-end processing circuit configured to process front-end signals from the back-end driving circuit.

[0017] The first power supply is connected to the front-end processing circuit and the back-end driving circuit in the touch driving circuit, respectively, and is configured to provide power to the front-end processing circuit and the back-end driving circuit;

[0018] The second power source is electrically connected to the back-end driving circuit in the touch driving circuit and is configured to provide power to the back-end driving circuit.

[0019] In some embodiments, both the first power supply and the second power supply include a regulated DC power supply;

[0020] The output voltage range of the first power supply is 2.8 to 4V;

[0021] The output voltage range of the second power supply is 7 to 8V.

[0022] The first power supply 2 has an output voltage of 3.0V; the second power supply 3 has an output voltage of 7.6V.

[0023] In some embodiments, the voltage levels provided by the first power supply and the second power supply to the back-end drive circuit include:

[0024] 0~3V, 0~7.6V, -7.6V~3V, -7.6V~7.6V.

[0025] In some embodiments, a third power supply and a fourth power supply are also included.

[0026] The touch display integrated circuit also includes input / output interface circuits and logic control circuits.

[0027] The third power source is electrically connected to the input / output interface circuit, the logic control circuit, and the common circuit, and is configured to provide power to the input / output interface circuit, the logic control circuit, and the common circuit;

[0028] The fourth power source is electrically connected to the input / output interface circuit and is configured to provide power to the input / output interface circuit.

[0029] In some embodiments, a third switch is also included.

[0030] The third switch is electrically connected between the third power supply and the touch driving circuit and / or between the third power supply and the display driving circuit.

[0031] In some embodiments, both the third power supply and the fourth power supply include a regulated DC power supply;

[0032] The output voltage range of the third power supply is 1.8 to 2.5V;

[0033] The output voltage range of the fourth power supply is 1.2 to 2V.

[0034] The present invention also provides a display device, including the above-described display panel.

[0035] The present invention also provides a driving method for the above-mentioned display panel, comprising: during the display phase when the display panel is in a display state,

[0036] When the display panel is in a touch state where a touch operation is performed, the second power supply provides power to the touch driving circuit of the display panel;

[0037] When the display panel is in a non-touch state where no touch operation is performed, the second power supply provides power to the touch driving circuit of the display panel, or the first power supply provides power to the touch driving circuit of the display panel.

[0038] In some embodiments, the method further includes: when the display panel is in a non-display phase where no display operation is performed and the display panel is in a non-touch state where no touch operation is performed, the second power supply provides power to the touch driving circuit of the display panel, or the first power supply provides power to the touch driving circuit of the display panel.

[0039] In some embodiments, during the display phase when the display panel is in a display state, the second power source provides power to the display driving circuit of the display panel.

[0040] In some embodiments, when the display panel is in a non-display phase where no display operation is performed, the second power supply stops providing power to the display driving circuit of the display panel.

[0041] The beneficial effects of the present invention are as follows: The display panel provided by the present invention, based on the fact that the first power supply can provide power to the touch driving circuit in the touch display integrated circuit, also allows the second power supply to provide power to the touch driving circuit. Compared with the capacitor component configuration in the mutual capacitance TDDI chip VR40 used in OLED touch display products in related technologies, the touch display integrated circuit in this embodiment can reduce the configuration of a charge pump, thereby reducing the configuration of a flying capacitor and a filter capacitor. This not only reduces the size of the touch display integrated circuit, but also lowers its cost. For example, for a display panel of about 7 inches, the power supply scheme of the first power supply and the second power supply in this embodiment can reduce the size of the touch display integrated circuit by about 6% and reduce its cost by about 6%.

[0042] The display device provided by the present invention, by employing the above-described display panel, can reduce the size of the display device and lower its cost. Attached Figure Description

[0043] Figure 1a is a schematic diagram of the circuit distribution plan in the mutual capacitance TDDI chip VR40 in the related technology;

[0044] Figure 1b is a schematic diagram of the power supply principle of the mutual capacitance TDDI chip VR40 in the related technology;

[0045] Figure 1c is a schematic diagram of the power supply potential of the mutual capacitance TDDI chip VR40 in the related technology;

[0046] Figure 2a is a schematic diagram of the power supply principle of a touch display integrated circuit in a display panel according to an embodiment of the present invention;

[0047] Figure 2b is a schematic diagram of the power supply potential of the touch display integrated circuit in the display panel of an embodiment of the present invention;

[0048] Figure 2c is a schematic block diagram of the touch display integrated circuit in the display panel of an embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of the power-on timing of the touch display integrated circuit in the display panel of an embodiment of the present invention. Detailed Implementation

[0050] To enable those skilled in the art to better understand the technical solution of the present invention, a display panel, its driving method, and a display device of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] In related technologies, in LCD (Liquid Crystal Display) products, the TDDI (Touch and Display Driver Integration) technology solution can reduce the number of mask layers in the manufacturing process of LCD touch display panels and save one FPC (Flexible Printed Circuit), thereby reducing the overall cost of LCD touch display panels. Therefore, the TDDI technology solution has been widely adopted in LCD products.

[0052] Currently, OLED (Organic Light-Emitting Diode) touch displays are gradually taking over the mobile phone market. Because OLED touch displays offer high-quality images that better meet consumer needs, they are increasingly being used in touch display products.

[0053] Referring to the TDDI technology solution for LCD products, a pure self-capacitive OLED TDDI chip (28nm process technology, i.e., 28nm chip manufacturing capability) is provided in related technologies. However, because the pure self-capacitive OLED TDDI chip technology solution cannot bring the benefits of mask reduction and FPC reduction to OLED touch display panels like the LCD TDDI technology solution, on the contrary, the wafer size of the pure self-capacitive OLED TDDI chip is too large, resulting in its cost being far greater than the technology solution of display driver chip (DIC) + touch driver chip (TIC) in OLED touch display panels (i.e., DIC and TIC are set independently); the overall cost performance of the pure self-capacitive OLED TDDI chip is very low, therefore the pure self-capacitive OLED TDDI chip technology solution has not been widely adopted.

[0054] Currently, the TDDI technology suitable for OLED touch display panels is the mutual capacitance TDDI technology solution.

[0055] The related technology provides a mutual capacitance TDDI chip VR40 (28nm process technology) suitable for mobile OLED touch display products, as shown in Figure 1a. GPO, MIPI, and I / O are input / output interface circuits; SRAM and Memory are storage circuits; OTP is software or program; Logic is logic circuit; Source and Gamma are display driver circuits; Touch RX and TX are touch driver circuits; and POWER is power supply circuit. The wafer size of this mutual capacitance TDDI chip is 32920*1617μm. 2 In the VR40 mutual-capacitance TDDI chip, the area of ​​the touch driver portion accounts for 17.75% (i.e., 32920*287μm).2 Since this mutual capacitance TDDI chip uses a 28nm node process, calculations show that the cost of the touch driver portion of this mutual capacitance TDDI chip is approximately equal to the cost of an external touch driver chip. External touch driver chips include FMLOC touch driver chips (TIC), where FMLOC refers to a touch structure layer configuration where the touch structure layer is directly fabricated on top of a stacked light-emitting structure layer and encapsulation layer.

[0056] To achieve the best cost performance, the TDDI chip VR40 has minimized the design of the touch driver (Touch) part on the wafer. The basic design specifications of its touch driver (Touch) part are shown in Table 1 below.

[0057] Table 1

[0058] In Table 1, PNL Size: Panel size; Load: Capacitive load; Channel: Channel; Reporting Rate: Reporting rate; APL: Accuracy, Precision, Linearity; Features: Features; Proximity: Proximity sensing; Active Pen: Active pen; Touch I / F: Touch input / output interface.

[0059] Figure 1b shows a schematic diagram of the power supply principle for the TDDI chip VR40. The TDDI chip VR40 has four power supplies: VDDIO, VDDI, VCI, and AVDD, provided by the host (e.g., a mobile phone).

[0060] The voltage range of VDDIO is 1.2–1.8V, with a typical voltage of 1.85V. The function of VDDIO is to be converted by voltage conversion devices to provide power to GPIO (General Purpose Digital Input / Output Interface). GPIO includes SPI communication interfaces (such as Sync synchronization signal interfaces, I2C signal interfaces, etc.), INT interrupt interfaces, and Reset reset interfaces.

[0061] The voltage of VDDI is 1.8V. The function of VDDI is to be converted by voltage conversion devices to other stable DC voltages as needed, and to power GPIO (General Purpose Digital Input / Output Interface) and logic circuits. Logic circuits, also known as digital circuits, have functions such as data storage and computation.

[0062] The VCI voltage is 3.0V. The function of the VCI is to supply power to the analog display driver circuit and touch driver circuit.

[0063] The voltage of AVDD is 7.6V. The function of AVDD is to supply power to the analog display driver circuit.

[0064] In related technologies, the power supply potential of the TDDI chip VR40 is shown in Figure 1c. A low-dropout linear regulator converts the high voltage to the low voltage required by the TDDI chip VR40, such as VGH 1 / 2, VINT_P, ELVDD, VGMP, VGSP, VDD, VDDM, ELVSS, VINT_N, and VGL 1 / 2. A charge pump (i.e., a voltage converter) converts the power supply voltage to other voltages required by the TDDI chip VR40, such as VGL, AVEE, VCL, and VGH. Direct Supply refers to the direct voltage supply, such as AVDD, VCI, VDDI, VDDIO, AVEE, and GND. Following the direct supply voltage arrangement from top to bottom in Figure 1c, the potential of the direct supply voltage decreases sequentially, i.e., AVDD > VCI > VDDI > VDDIO > GND > AVEE. Additionally, in Figure 1c, Gamma, Source, and GOA are circuits in the simulated display driver circuit of the TDDI chip VR40. Touch Drive refers to the analog touch driver circuitry within the TDDI chip VR40; AFE / ADC is the analog front-end circuitry within the TDDI chip VR40, responsible for processing the front-end signals from the analog display driver and touch driver circuits. IO stands for Input / Output circuitry. Digital Logic (Memory) refers to the logic and storage circuitry within the TDDI chip VR40.

[0065] The aforementioned mutual capacitance TDDI chip (TDDI chip VR40) suitable for OLED touch display panels is not cost-effective. Currently, there is no cost-effective mutual capacitance TDDI chip suitable for OLED touch display panels.

[0066] To address the aforementioned problems, embodiments of the present invention provide a display panel, as shown in Figures 2a, 2b, and 2c, comprising: a touch display integrated circuit 1, a first power supply (VCI) 2, and a second power supply (AVDD) 3. The touch display integrated circuit 1 includes an analog driving circuit 11, which includes a touch driving circuit 111 and a display driving circuit (DDI) 112. The first power supply 2 is electrically connected to the touch driving circuit 111 and the display driving circuit 112 and is configured to provide power to the touch driving circuit 111 and the display driving circuit 112. The second power supply 3 is electrically connected to the display driving circuit 112 and is configured to provide power to the display driving circuit 112. The second power supply 3 is also electrically connected to the touch driving circuit 111 and is further configured to provide power to the touch driving circuit 111.

[0067] The touch display integrated circuit 1 refers to the circuit integrating touch driving and display driving in the display panel (Touch and Display Driver Integration, or TDDI). The touch display integrated circuit 1 improves the integration of the display panel while reducing material and manufacturing costs. The touch driving circuit 111 is configured to control the display panel for touch sensing; specifically, it converts the touch captured by the touchscreen into electrical signals and decodes these electrical signals into screen coordinates, thereby achieving touch recognition and processing. The display driving circuit 112 is configured to control the display panel for display; specifically, it controls the opening and closing of the gates of the driving transistors in the pixel circuit, thereby achieving pixel switching control; and it transmits data to the pixels to achieve image display.

[0068] In this embodiment, based on the fact that the first power supply 2 can provide power to the touch driving circuit 111 in the touch display integrated circuit 1, by enabling the second power supply 3 to also provide power to the touch driving circuit 111, compared with the capacitor component configuration in the mutual capacitance TDDI chip VR40 used in OLED touch display products in related technologies, the touch display integrated circuit 1 in this embodiment can reduce the configuration of a charge pump (i.e., a capacitive voltage converter), thereby reducing the configuration of a flying capacitor and a filter capacitor. This not only reduces the size of the touch display integrated circuit 1, but also lowers its cost. For example, for a display panel of about 7 inches, the power supply scheme of the first power supply 2 and the second power supply 3 in this embodiment can reduce the size of the touch display integrated circuit 1 by about 6% and reduce its cost by about 6%.

[0069] In some embodiments, as shown in FIG2c, the display panel further includes a first power switch 4, which is electrically connected between the second power supply 3 and the touch driving circuit 111 and / or between the second power supply 3 and the display driving circuit 112.

[0070] The first switch 4 can be used to turn on or off the electrical connection between the second power supply 3 and the touch driving circuit 111, and the first switch 4 can also be used to turn on or off the electrical connection between the second power supply 3 and the display driving circuit 112.

[0071] In some embodiments, as shown in FIG2c, the display panel further includes a second switch 5, which is electrically connected between the first power supply 2 and the touch driving circuit 111 and / or between the first power supply 2 and the display driving circuit 112.

[0072] In some embodiments, as shown in FIG2c, in the touch driving circuit 111 of the touch display integrated circuit 1, Tx(0)-Tx(39) represent touch driving signals; Rx(0)-Rx(39) represent touch sensing signals; AFE represents signal amplifier (Anolog Front End); Tx Wave represents waveform generator, used to generate touch driving signals; Global Tx control represents Tx overall control, used to control the frequency of touch driving signals; ADC represents analog-to-digital conversion circuit; TPOSC represents touch crystal oscillator circuit (i.e., first crystal oscillator circuit); PWREST represents power reset circuit; Power Management Unit represents power management circuit; MCU represents main control circuit; IRQCTL represents interrupt registration circuit; IRQ represents interrupt request; MST represents signal transmission; Timer represents clock circuit; Host_INT represents interrupt signal generator between the host and the host, used to generate interrupt signals. In the display driver circuit 112 of the touch display integrated circuit 1, MIPIPHY represents a mode of MIPI interface; MIPIPower supply represents MIPI power supply; MIPI I / F represents MIPI input / output interface (data transmission signal; currently, display panels all use MIPI transmission, using four pairs of differential signals to transmit image data and one pair of differential clock signals); SPI I / F represents SPI communication bus input / output interface; Index Register (IR) represents register circuit; OTP represents program or software; GAMMA represents GAMMA circuit used to drive the display; Source Driver represents source driver, i.e., display data driver circuit; Data Processor represents data processing circuit; GRAM / Demmura represents storage circuit; OSC represents crystal oscillator circuit (i.e., second crystal oscillator circuit); Timing / state controller represents timing controller; VCL Charge Pump represents VCL voltage converter circuit; AVEE Charge Pump represents AVEE voltage converter circuit; VGH and VGL Charge Pump represents VGH and VGL voltage converter circuit; GOA represents gate drive circuit; DVDD regulator represents DVDD voltage regulator; regulator represents voltage regulator.

[0073] In some embodiments, as shown in FIG2a, the analog drive circuit 11 further includes a common circuit (Com.) 113, and the first power supply 2 is also electrically connected to the common circuit 113.

[0074] Among them, the common circuit 113 consists of some analog circuits shared by the display driving circuit 112 and the touch driving circuit 111, such as: ESD (electrostatic discharge) circuit, OSC (crystal oscillator) circuit (i.e., the third crystal oscillator circuit), common voltage circuit, etc.

[0075] In some embodiments, as shown in FIG2b, the touch driving circuit 111 includes a front-end processing circuit Touch AFE / ADC and a back-end driving circuit Touch Drive. A first power supply (VCI) 2 is electrically connected to the front-end processing circuit Touch AFE / ADC and the back-end driving circuit Touch Drive; a second power supply (AVDD) 3 is electrically connected to the back-end driving circuit Touch Drive.

[0076] In some embodiments, the front-end processing circuit Touch AFE / ADC processes the front-end signals of the back-end driving circuit Touch Drive, such as performing analog-to-digital conversion, amplification, providing a reference source, and excitation on the front-end signals of Touch Drive. The back-end driving circuit Touch Drive performs touch driving, such as providing the touch driving signal Tx.

[0077] The front-end processing circuit Touch AFE / ADC includes: signal amplifier AFE (Anolog Front End), analog-to-digital converter ADC, waveform generator Tx Wave (analog circuit), global Tx Control (digital circuit), touch crystal oscillator circuit TPOSC, power reset circuit PWREST, and power management unit.

[0078] The back-end drive circuit, Touch Drive, includes: the main control circuit MCU, the interrupt registration circuit IRQCTL, the clock circuit Timer, and the interrupt signal generator Host-INT.

[0079] In some embodiments, both the first power supply 2 and the second power supply 3 include a regulated DC power supply; the output voltage range of the first power supply 2 is 2.8 to 4V; and the output voltage range of the second power supply 3 is 7 to 8V.

[0080] In some embodiments, the output voltage of the first power supply 2 is 3.0V, and the output voltage of the second power supply 3 is 7.6V.

[0081] In some embodiments, the voltage levels supplied by the first power supply 2 and the second power supply 3 to the rear-end drive circuit Touch Drive include: 0~3V, 0~7.6V, -7.6V~3V, and -7.6V~7.6V. That is, the voltage levels of the rear-end drive circuit Touch Drive are available in multiple ranges as described above.

[0082] In some embodiments, the voltage level provided by the first power supply 2 and the second power supply 3 to the back-end driving circuit Touch Drive can be selected based on the power consumption requirements of the display panel and the mutual interference between the touch layer and the display layer in the display panel. While ensuring a sufficient touch signal-to-noise ratio, the voltage provided to the back-end driving circuit Touch Drive should be a moderately low voltage. For example, if the touch electrode design of the display panel is 1T1R(1T... X 1R X In a scheme where one touch driving electrode corresponds to one touch sensing electrode, the display panel experiences a relatively large load. To ensure a high touch signal-to-noise ratio (SNR), the preferred voltage supplied to the back-end touch drive circuit is -7.6V to 3V or -7.6V to 7.6V. If the touch electrode design of the display panel is 2T1R (2T... X 1R X In the case of a scheme where two touch driving electrodes correspond to one touch sensing electrode, the load on the display panel is relatively small. Even if a low voltage difference (such as 0-3V, 0-7.6V, -7.6V-3V) power supply scheme to the back-end drive circuit Touch Drive is selected, a relatively good high touch signal-to-noise ratio can still be obtained.

[0083] In some embodiments, as shown in FIG2a, the display panel further includes a third power supply (VDDI) 6 and a fourth power supply (VDDIO) 7, and the touch display integrated circuit 1 further includes an input / output interface circuit (I / O) 12 and a logic control circuit (Logic) 13. The third power supply 6 is electrically connected to the input / output interface circuit 12, the logic control circuit 13 and the common circuit 113; the fourth power supply 7 is electrically connected to the input / output interface circuit 12.

[0084] The third power supply 6 provides power to the input / output interface circuit 12, the logic control circuit 13, and the common circuit 113. The fourth power supply 7 provides power to the input / output interface circuit 12. As shown in Figure 2a, the input / output interface circuit 12 is a GPIO (General Purpose Digital Input / Output) circuit. The logic control circuit 13 performs digital operations such as amplification, reduction, and averaging. The third power supply 6 drives the logic control circuit 13 through an LDO (Low Dropout Linear Regulator).

[0085] In some embodiments, as shown in FIG2a, the display panel further includes a flash memory circuit (Flash) 8 and a host. The flash memory circuit 8 is used to provide stored signals or data (such as display data) to the touch display integrated circuit 1. The flash memory circuit 8 is powered by a third power supply 6. The first power supply 2, the second power supply 3, the third power supply 6, and the fourth power supply 7 are all provided by the host.

[0086] In some embodiments, as shown in FIG2c, the display panel further includes a third switch 9, which is electrically connected between the third power supply 6 and the touch driving circuit 111 and / or between the third power supply 6 and the display driving circuit 112.

[0087] The third switch 9 can be used to turn on or off the electrical connection between the third power supply 6 and the touch driving circuit 111, and the third switch 9 can also be used to turn on or off the electrical connection between the third power supply 6 and the display driving circuit 112.

[0088] In some embodiments, both the third power supply 6 and the fourth power supply 7 include a regulated DC power supply; the output voltage range of the third power supply 6 is 1.8 to 2.5V; and the output voltage range of the fourth power supply 7 is 1.2 to 2V.

[0089] In some embodiments, such as the third power supply 6, the output voltage is 1.8V.

[0090] In some embodiments, as shown in FIG2b, the potentials of the power supply for powering the touch display integrated circuit 1 are illustrated. High voltages are converted to low voltages required by the touch display integrated circuit 1 via a low-dropout linear regulator, such as VGH 1 / 2, VINT_P, ELVDD, VGMP, VGSP, VDD, VDDM, ELVSS, VINT_N, and VGL 1 / 2. The power supply voltage is converted to other voltages required by the touch display integrated circuit 1 via a charge pump (i.e., a voltage converter), such as VGL, AVEE, and VGH. "Direct Supply" refers to voltages supplied directly, such as AVDD, VCI, VDDI, VDDIO, AVEE, and GND. Following the direct supply voltage arrangement from top to bottom in FIG2b, the potentials of the direct supply voltages decrease sequentially, i.e., AVDD > VCI > VDDI > VDDIO > GND > AVEE. Additionally, in FIG2b, Gamma, Source, and GOA are circuits within the display driver circuit 112 of the touch display integrated circuit 1. Touch Drive is the back-end drive circuit in touch driver circuit 111; Touch AFE / ADC is the front-end processing circuit in touch driver circuit 111. IO is input / output circuit. Digital Logic (Memory) refers to the logic circuits and storage circuits in touch display integrated circuit 1.

[0091] Based on the above-described structure of the display panel, this embodiment of the invention also provides a driving method for the display panel, as shown in FIG3, including: during the display on-state of the display panel (i.e., the display state in which the display panel is in display mode), when the display panel is in a touch state where a touch operation is performed, a second power supply provides power to the touch driving circuit of the display panel; when the display panel is in a touch idle state where a touch operation is not performed, the second power supply provides power to the touch driving circuit of the display panel, or a first power supply provides power to the touch driving circuit of the display panel.

[0092] The touch idle state (i.e., non-touch state) refers to the state in which the display panel does not perform any touch operation or touch processing. For example, it may be a state in which the display panel is only viewed and no touch operation is performed; or a state in which the display panel is only read and no touch operation is performed.

[0093] In this embodiment, when the display panel is in touch mode, the touch driving circuit of the display panel is powered by the second power supply, which ensures normal touch operation of the display panel during display. When the display panel is in touch idle mode, the touch driving circuit of the display panel is powered by either the first power supply or the second power supply, which ensures that the touch function of the display panel can be woken up at any time. When the second power supply powers the touch driving circuit, the touch wake-up of the display panel is more sensitive. When the first power supply powers the touch driving circuit, the touch power consumption of the display panel can be reduced.

[0094] As shown in Figure 3, the sixth stage of the display panel driver, namely the display state (Driver State), is the display on stage, and the touch state corresponds to two touch modes; the third and fourth power supplies (VDDI and VDDIO), the first power supply (VCI), and the reset signal (RESX) are all at a high level; the processor input / output interface (MIPI I / F) receives image information written from the host (Image Write), and the display panel performs normal display (Normal Display).

[0095] During the Display On phase, the second power supply powers the display driver circuit (AVDD power on). The display panel supports two touch modes: 1. Touch Active Mode (Normal); 2. Touch Idle Mode. In Touch Active Mode, the second power supply powers the touch driver circuit. In Touch Idle Mode, the touch driver circuit has two power supply options: Option 1: The second power supply powers the touch driver circuit (AVDD Touch power on), resulting in more sensitive touch wake-up; Option 2: The second power supply no longer powers the touch driver circuit (AVDD Touch Power off), and the first power supply powers the touch driver circuit (VCIDrive Touch) to save power.

[0096] In this embodiment, the two power supply methods in the touch idle mode are selected according to the actual situation of the host debugging. Referring to FIG2c, when the second power supply (AVDD) supplies power to the touch driving circuit in the touch idle mode, the second switch 5 disconnects the electrical connection between the first power supply (VCI) and the touch driving circuit (Touch part); when the first power supply (VCI) supplies power to the touch driving circuit in the touch idle mode, the first switch 4 disconnects the electrical connection between the second power supply (AVDD) and the touch driving circuit (Touch part).

[0097] In some embodiments, the driving method for the display panel further includes: during the display off phase of the display panel, when the display panel is in a touch idle state, a second power supply provides power to the touch driving circuit of the display panel, or a first power supply provides power to the touch driving circuit of the display panel.

[0098] In the display-off phase (i.e., non-display phase or non-display state) when the display panel does not perform display operations, the display panel is in a touch idle state. Power is supplied to the touch driving circuit of the display panel through the first power supply or the second power supply, which can ensure that the touch function of the display panel can be woken up at any time. When the second power supply supplies power to the touch driving circuit, the touch wake-up of the display panel is more sensitive. When the first power supply supplies power to the touch driving circuit, the touch power consumption of the display panel can be reduced.

[0099] As shown in Figure 3, the seventh stage of the display panel driver, namely the display off stage (Driver State), is when the display is in sleep mode (Sleep In) and the touch state is in touch sleep mode (Touch Sleep Mode). The third and fourth power supplies (VDDI and VDDIO), the first power supply (VCI), and the reset signal (RESX) are all at high level. The processor input / output interface (MIPI I / F) signal is at high level, and no image information is written from the host side.

[0100] During the Display Off phase, the second power supply no longer supplies power to the display driver circuit (AVDD DDI power off); the display panel can correspond to Touch Idle Mode, also known as Touch Sleep Mode or a non-touch state. In Touch Sleep Mode, the touch on the display panel can be woken up by gestures (Gesture Wakeup); in Touch Idle Mode, the touch driver circuit has two power supply methods: Option 1: The second power supply supplies power to the touch driver circuit (AVDD Touch power on), making touch wake-up more sensitive; Option 2: The second power supply no longer supplies power to the touch driver circuit (AVDD_Touch Power off), and the first power supply supplies power to the touch driver circuit (VCIDrive Touch) to save power consumption.

[0101] In some embodiments, as shown in FIG3, during the display on stage when the display panel performs image writing, the second power supply provides power to the display driving circuit of the display panel (AVDD power on, i.e., AVDD DDI power on).

[0102] In some embodiments, as shown in FIG3, during the display off phase when the display panel does not perform image writing, the second power supply stops providing power to the display driver circuit of the display panel (AVDD DDI power off).

[0103] In this embodiment, as shown in FIG3, the driving of the display panel includes the following stages before the display on stage:

[0104] The first stage, the Unknown stage, refers to a stage where both the display state (Driver State) and the touch state are unknown. In this stage, the display panel powers on, and the third and fourth power supplies (VDDI and VDDIO, with the same power-on sequence), and the first power supply (VCI) are powered on sequentially. The reset signal (RESX), processor input / output interface (MIPI I / F) signal, SWIRE2 control signal, and the second power supply (AVDD) all remain at a low level.

[0105] The second stage, the Reset stage: Both the Driver State and Touch State are in the Reset stage. In this stage, the reset signal (RESX) is high, low, high, resetting all circuits (including register circuits) within the touch display integrated circuit, and then remains high. The third and fourth power supplies (VDDI and VDDIO), and the first power supply (VCI) are high. The processor input / output interface (MIPI I / F) signal level is pulled high, starting the download of initial code from the host.

[0106] The third stage, OTP Reload, involves downloading the display and touch program or firmware (fw) from the flash memory circuit to the touch display integrated circuit. Display OTP Reload includes downloading information such as Gamma Band (one gamma band corresponds to one display brightness level, and one gamma band is one gamma band), timing control, and Panel ID (display panel identification code); the third and fourth power supplies (VDDI and VDDIO), the first power supply (VCI), and the reset signal (RESX) are all at high levels; the processor input / output interface (MIPI I / F) signal level is pulled high, and the initial code state is downloaded from the host. The initial code state includes parameters such as resolution and PPS (decompression parameters).

[0107] In the fourth stage, the display state (Driver State) is in the Multi IP Reload & CMD Exec stage, and the touch state (Touch State) is in the TP FW Upload stage (i.e., the touch firmware or program is downloaded from the flash memory circuit to the touch display integrated circuit). The Multi IP Reload & CMD Exec stage and the TP FW Upload stage are synchronized. In this stage, the third and fourth power supplies (VDDI and VDDIO), the first power supply (VCI), and the reset signal (RESX) are all at a high level. The processor input / output interface (MIPI I / F) signal level is pulled high, and the initial code state (such as SLPOUT: power-on command) is downloaded from the host. That is, after the processor input / output interface (MIPI I / F) signal issues the power-on command and the SWIRE2 control signal is pulled high, the host PMIC (power management integrated circuit) turns on the second power supply AVDD to supply power to the touch display integrated circuit.

[0108] In the fifth stage, the display state (Driver State) is in the Power Up Sequence stage, and the touch state (Touch State) is in the Touch Scan Initial stage, with the Power Up Sequence stage and the Touch Scan Initial stage synchronized. The third and fourth power supplies (VDDI and VDDIO), the first power supply (VCI), and the reset signal (RESX) are all at high levels; the processor input / output interface (MIPI I / F) signal level is pulled high; the SWIRE2 control signal controls the external PMIC (Power Management Integrated Circuit) to supply power to the display driver circuit in the touch display integrated circuit, and the touch driver circuit in the touch display integrated circuit prepares for touch scanning.

[0109] Unlike related technologies that require control signals to switch between touch and display modes on the display panel, in this embodiment, the touch driving circuit and the display driving circuit inside the touch display integrated circuit have a Sync signal for mutual communication (a signal that provides the same time reference for the touch driving circuit and the display driving circuit that need to process information synchronously). The Sync signal enables the display panel to switch between touch and display modes without delay.

[0110] The display panel provided in this embodiment, based on the first power supply providing power to the touch driving circuit in the touch display integrated circuit, also allows the second power supply to provide power to the touch driving circuit. Compared to the capacitor component configuration in the mutual capacitance TDDI chip VR40 used in OLED touch display products in related technologies, the touch display integrated circuit in this embodiment can reduce the configuration of a charge pump, thereby reducing the configuration of a flying capacitor and a filter capacitor. This not only reduces the size of the touch display integrated circuit but also lowers its cost. For example, for a display panel of about 7 inches, the power supply scheme of the first and second power supplies in this embodiment can reduce the size of the touch display integrated circuit by about 6% and lower its cost by about 6%.

[0111] This invention also provides a display device, including the display panel described in the above embodiments.

[0112] By using the display panel in the above embodiments, the size of the display device can be reduced, and the cost of the display device can be lowered.

[0113] The display device can be any product or component with display function, such as an OLED panel, OLED TV, foldable product, touch screen, e-paper, mobile phone, tablet computer, laptop computer, monitor, laptop computer, digital photo frame, navigator, etc.

[0114] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display panel, comprising: The touch display integrated circuit, a first power supply and a second power supply, The touch display integrated circuit comprises an analog driving circuit, The analog driving circuit comprises a touch driving circuit configured to control the display panel to perform touch sensing and a display driving circuit configured to control the display panel to perform display; The first power supply is electrically connected to the touch driving circuit and the display driving circuit, and is configured to provide power supply to the touch driving circuit and the display driving circuit; The second power supply is electrically connected to the display driving circuit, and is configured to provide power supply to the display driving circuit; The second power supply is further electrically connected to the touch driving circuit, and is further configured to provide power supply to the touch driving circuit.

2. The display panel of claim 1, wherein, Further comprising a first switch, The first switch is electrically connected between the second power supply and the touch driving circuit and / or between the second power supply and the display driving circuit.

3. The display panel of claim 1 or 2, wherein, Further comprising a second switch, The second switch is electrically connected between the first power supply and the touch driving circuit and / or between the first power supply and the display driving circuit.

4. The display panel of claim 1, wherein, The analog driving circuit further comprises a common circuit shared by the display driving circuit and the touch driving circuit, The first power supply is further electrically connected to the common circuit, and is configured to provide power supply to the common circuit.

5. The display panel of claim 4, wherein, The touch driving circuit comprises a back-end driving circuit configured to provide a touch driving signal and a front-end processing circuit configured to process a front-end signal of the back-end driving circuit, The first power supply is electrically connected to the front-end processing circuit and the back-end driving circuit in the touch driving circuit respectively, and is configured to provide power supply to the front-end processing circuit and the back-end driving circuit; The second power supply is electrically connected to the back-end driving circuit in the touch driving circuit, and is configured to provide power supply to the back-end driving circuit.

6. The display panel of claim 5, wherein The first power supply and the second power supply each comprise a stabilized direct current power supply; The output voltage range of the first power supply is 2.8-4V; The output voltage range of the second power supply is 7-8V.

7. The display panel of claim 6, wherein The output voltage of the first power supply 2 is 3.0V; The output voltage of the second power supply 3 is 7.6V.

8. The display panel of claim 6, wherein, The voltage range provided by the first power supply and the second power supply to the back-end driving circuit comprises 0-3V, 0-7.6V, -7.6V-3V and -7.6V-7.6V.

9. The display panel of claim 4, wherein, Further comprising a third power supply and a fourth power supply, The touch display integrated circuit further comprises an input-output interface circuit and a logic control circuit, The third power supply is electrically connected to the input-output interface circuit, the logic control circuit and the common circuit, and is configured to provide power supply to the input-output interface circuit, the logic control circuit and the common circuit; The fourth power supply is electrically connected to the input-output interface circuit, and is configured to provide power supply to the input-output interface circuit.

10. The display panel of claim 9, wherein, Further comprising a third switch, The third switch is electrically connected between the third power supply and the touch driving circuit and / or between the third power supply and the display driving circuit.

11. The display panel of claim 9, wherein, the third power supply and the fourth power supply each comprise a stabilized direct current power supply; an output voltage range of the third power supply is 1.8-2.5V; an output voltage range of the fourth power supply is 1.2-2V.

12. A display device comprising: a display panel as claimed in any one of claims 1-11.

13. A driving method of a display panel according to any one of claims 1 to 11, characterized by, comprising: in a display phase in which the display panel is in a display state, when the display panel is in a touch state in which a touch operation is performed, the second power supply provides power supply for the touch driving circuit of the display panel; when the display panel is in a non-touch state in which a touch operation is not performed, the second power supply provides power supply for the touch driving circuit of the display panel, or the first power supply provides power supply for the touch driving circuit of the display panel.

14. The driving method of the display panel according to claim 13, wherein further comprising: in a non-display phase in which the display panel does not perform a display operation and the display panel is in the non-touch state in which a touch operation is not performed, the second power supply provides power supply for the touch driving circuit of the display panel, or the first power supply provides power supply for the touch driving circuit of the display panel.

15. The driving method of the display panel according to claim 13, wherein in the display phase in which the display panel is in a display state, the second power supply provides power supply for the display driving circuit of the display panel.

16. The driving method of the display panel according to claim 14, wherein in the non-display phase in which the display panel does not perform a display operation, the second power supply stops providing power supply for the display driving circuit of the display panel.

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