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] The present application belongs to the field of display, and particularly relates to a display panel, a driving method thereof and a display device. BACKGROUND

[0002] With the continuous development of display technology, touch display devices have been widely applied. At present, the touch panel and the display panel in the touch display device are respectively controlled by two chips independently. In order to improve the integration of the touch display device, the TDDI (Touch and Display Driver Integration) chip emerges as the times require. SUMMARY

[0003] The present application provides a display panel, a driving method thereof and a display device. The display panel not only reduces the size of the touch display integrated circuit, but also reduces the cost of the touch display integrated circuit.

[0004] The present application 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 comprises an analog driving circuit,

[0006] 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;

[0007] 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;

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

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

[0010] In some embodiments, a first switch is further 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 further 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 comprises a common circuit shared by the display driving circuit and the touch driving circuit,

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

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

[0017] 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 configured to provide power supply to the front-end processing circuit and the back-end driving circuit;

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

[0019] In some embodiments, the first power supply and the second power supply both comprise a stabilized direct current power supply;

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

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

[0022] 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.

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

[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 further included,

[0026] The touch display integrated circuit further comprises an input-output interface circuit and a logic control circuit,

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

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

[0029] In some embodiments, a third switch is further 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, the third power supply and the fourth power supply each comprise a stabilized direct current power supply.

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

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

[0034] The present application further provides a display device comprising the display panel.

[0035] The present application further provides a driving method of the display panel, comprising:

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

[0037] 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 to the touch driving circuit of the display panel, or the first power supply provides power supply to the touch driving circuit of the display panel.

[0038] In some embodiments, when the display panel is in a non-display stage in which a display operation is not performed and the display panel is in a non-touch state in which a touch operation is not performed, the second power supply provides power supply to the touch driving circuit of the display panel, or the first power supply provides power supply to the touch driving circuit of the display panel.

[0039] In some embodiments, when the display panel is in the display stage in which a display operation is performed, the second power supply provides power supply to the display driving circuit of the display panel.

[0040] In some embodiments, when the display panel is in a non-display stage in which a display operation is not performed, the second power supply stops providing power supply to the display driving circuit of the display panel.

[0041] The display panel provided by the present application can reduce the size of the display panel and reduce the cost of the display panel.

[0042] The display device provided by the present application can reduce the size of the display device and reduce the cost of the display device by using the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0043] FIG. 1a is a circuit distribution plane schematic diagram of the mutual capacitance TDDI chip VR40 in the related art;

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

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

[0046] FIG. 2a is a principle schematic diagram of the power supply of the touch display integrated circuit in the display panel of the embodiment of the present application;

[0047] FIG. 2b is a power supply potential schematic diagram of the touch display integrated circuit in the display panel of the embodiment of the present application;

[0048] FIG. 2c is a principle block diagram of the touch display integrated circuit in the display panel of the embodiment of the present application;

[0049] FIG. 3 is a power-on timing schematic diagram of the touch display integrated circuit in the display panel of the embodiment of the present application. DETAILED DESCRIPTION

[0050] In order for those skilled in the art to better understand the technical solutions of the present application, the display panel, the driving method thereof and the display device of the present application are further described in detail below in combination with the drawings and specific embodiments.

[0051] In the related art, in an LCD (Liquid Crystal Display) product, a TDDI (Touch and Display Driver Integration) technical solution can reduce the number of mask layers in the preparation process of an LCD touch display panel and save one FPC (Flexible Printed Circuit), thereby reducing the cost of the LCD touch display panel as a whole, and thus the TDDI technical solution has been widely popularized in the LCD product.

[0052] At present, OLED (Organic Light-Emitting Diode) touch display screens are gradually occupying the mobile phone market. Since the OLED touch display screen exhibits high-quality pictures, it can better meet the needs of consumers, and thus the OLED touch display screen is increasingly applied to touch display products.

[0053] Referring to the TDDI technical solution of the LCD product, the related art provides a pure self-capacitance OLED TDDI chip (28nm process, i.e., a chip process capability of 28nm). However, the pure self-capacitance OLED TDDI chip technical solution cannot bring the benefits of mask reduction and FPC reduction to the OLED touch display panel like the LCD TDDI technical solution. On the contrary, the wafer size of the pure self-capacitance OLED TDDI chip is too large, which results in a cost much higher than that of the technical solution of a display driving chip (DIC) + a touch driving chip (TIC) (i.e., the DIC and the TIC are independently arranged) in the OLED touch display panel. The pure self-capacitance OLED TDDI chip has a very low comprehensive cost performance, and thus the pure self-capacitance OLED TDDI chip technical solution has not been popularized.

[0054] At present, the TDDI technology suitable for the OLED touch display panel is a mutual-capacitance TDDI technical solution.

[0055] The related art provides a mutual-capacitance TDDI chip VR40 (28nm process) suitable for a Mobile OLED touch display product, as shown in FIG. 1a. GPO, MIPI, and I / O are input and output interface circuits; SRAM and Memory are storage circuits; OTP is software or a program; Logic is a logic circuit; Source and Gamma are display driving circuit parts; Touch RX and TX are touch driving circuit parts; and POWER is a power supply circuit. The wafer size of the mutual-capacitance TDDI chip is 32920*1617μm 2 , and the area ratio of the touch driving (Touch) part in the mutual-capacitance TDDI chip VR40 is 17.75% (i.e., 32920*287μm2 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 role of AVDD is to power the analog display driving circuit.

[0064] In the related art, the power supply potential of the TDDI chip VR40 is shown in FIG. 1c. Among them, the high voltage is converted into the low voltage required by the TDDI chip VR40, such as VGH 1 / 2, VINT_P, ELVDD, VGMP, VGSP, VDD, VDDM, ELVSS, VINT_N, VGL 1 / 2, by a linear regulator. The other voltages required by the TDDI chip VR40, such as VGL, AVEE, VCL, VGH, are converted by a charge pump (voltage converter) from the power supply voltage. Direct supply represents the voltage directly supplied, such as AVDD, VCI, VDDI, VDDIO, AVEE, GND, etc. The arrangement order of the direct supply voltage from top to bottom in FIG. 1c is that the potential of the direct supply voltage decreases in turn, that is, AVDD>VCI>VDDI>VDDIO>GND>AVEE. In addition, in FIG. 1c, Gamma, Source, GOA are all circuits in the analog display driving circuit in the TDDI chip VR40. Touch Drive is a circuit in the analog touch driving circuit in the TDDI chip VR40; AFE / ADC is an analog front-end circuit in the TDDI chip VR40, which functions to process the front-end signals of the analog display driving circuit and the touch driving circuit. IO is an input and output circuit. Digital Logic (Memory) is a logic circuit and a storage circuit in the TDDI chip VR40.

[0065] The mutual capacitance TDDI chip (TDDI chip VR40) suitable for the OLED touch display panel has insufficient cost performance, and at present, there is no mutual capacitance TDDI chip with higher cost performance suitable for the OLED touch display panel.

[0066] To solve the above problems, the embodiment of the present application provides a display panel, as shown in FIG. 2a, FIG. 2b and FIG. 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 comprising an analog driving circuit 11, the analog driving circuit 11 comprising a touch driving circuit 111 and a display driving circuit 112; the first power supply 2 being electrically connected to the touch driving circuit 111 and the display driving circuit 112 and being configured to provide power supply to the touch driving circuit 111 and the display driving circuit 112; the second power supply 3 being electrically connected to the display driving circuit 112 and being configured to provide power supply to the display driving circuit 112; and the second power supply 3 also being electrically connected to the touch driving circuit 111 and being configured to provide power supply to the touch driving circuit 111.

[0067] The touch display integrated circuit 1 refers to a circuit (Touch and Display Driver Integration, namely TDDI) integrating touch driving and display driving in the display panel. The touch display integrated circuit 1 improves the integration of the display panel, and also reduces the material cost and the manufacturing cost of the display panel. The touch driving circuit 111 is configured to control the display panel to perform touch sensing, specifically, to convert the touch captured by the touch screen into an electrical signal, and to decode the electrical signal into screen coordinates, so as to realize the recognition and processing of the touch. The display driving circuit 112 is configured to control the display panel to perform display, specifically, to control the opening and closing of the gate of the driving transistor in the pixel circuit, so as to realize the switching control of the pixel; and to transmit data to the pixel, so as to realize the display of the image.

[0068] In the embodiment, on the basis that the first power supply 2 can provide power supply to the touch driving circuit 111 in the touch display integrated circuit 1, by making the second power supply 3 also provide power supply to the touch driving circuit 111, compared with the configuration of the capacitive element in the mutual-capacitance TDDI chip VR40 applied to the OLED touch display product in the related art, the touch display integrated circuit 1 in the embodiment can reduce the configuration of one charge pump (Charge Pump, namely capacitive voltage converter), so as to reduce the configuration of one flying capacitor and one filter capacitor, and further not only reduce the size of the touch display integrated circuit 1, but also reduce the cost of the touch display integrated circuit 1; for a display panel of about 7 inches, the scheme of supplying power by the first power supply 2 and the second power supply 3 in the embodiment can reduce the size of the touch display integrated circuit 1 by about 6%, and reduce the cost of the touch display integrated circuit 1 by about 6%.

[0069] In some embodiments, as shown in FIG. 2c, the display panel further comprises a first 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 turn 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 turn off the electrical connection between the second power supply 3 and the display driving circuit 112.

[0071] In some embodiments, as shown in FIG. 2c, the display panel further comprises 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 FIG. 2c, in the touch driving circuit 111 in the touch display integrated circuit 1, Tx(0)-Tx(39) represent touch driving signals; Rx(0)-Rx(39) represent touch sensing signals; AFE represents an analog front end; Tx Wave represents a waveform generator for generating touch driving signals; Global Tx control represents Tx global control for controlling the frequency of touch driving signals; ADC represents an analog-to-digital conversion circuit; TPOSC represents a touch oscillator circuit (i.e., a first oscillator circuit); PWREST represents a power reset circuit; Power Management Unit represents a power management circuit; MCU represents a main control circuit; IRQCTL represents an interrupt registration circuit; IRQ represents an interrupt request; MST represents signal transmission; Timer represents a clock circuit; Host_INT represents an interrupt signal generator between the touch display integrated circuit 1 and a host; in the display driving circuit 112 in the touch display integrated circuit 1, MIPI PHY represents a mode of MIPI interface; MIPI Power supply represents an MIPI power supply; MIPI I / F represents an MIPI input / output interface (data transmission signal, currently display panels all use MIPI transmission, and four pairs of differential signals are used to transmit image data and a pair of differential clock signals during transmission); SPI I / F represents an SPI communication bus input / output interface; Index Register (IR) represents a register circuit; OTP represents a program or software; GAMMA represents a GAMMA circuit for driving display; Source Driver represents a source driver, i.e., a display data driving circuit; Data Processor represents a data processing circuit; GRAM / Demmura represents a storage circuit; OSC represents an oscillator circuit (i.e., a second oscillator circuit); Timing / state controller represents a timing / state controller; VCL Charge Pump represents a VCL voltage converter circuit; AVEE Charge Pump represents an AVEE voltage converter circuit; VGH and VGL Charge Pump represent VGH and VGL voltage converter circuits; GOA represents a gate driving circuit; DVDD regulator represents a DVDD voltage regulator; and regulator represents a voltage regulator.

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

[0074] The common circuit 113 is some analog circuits shared by the display driving circuit 112 and the touch driving circuit 111, for example, an ESD (electrostatic discharge) circuit, an OSC (crystal oscillator) circuit (i.e., a third crystal oscillator circuit), a common voltage circuit, and the like.

[0075] In some embodiments, as shown in FIG. 2b, the touch driving circuit 111 includes a front-end processing circuit Touch AFE / ADC and a back-end driving circuit Touch Drive, the 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, and the 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 is configured to process the front-end signal of the back-end driving circuit Touch Drive, such as analog-to-digital conversion, amplification, providing a reference source, excitation, and the like. The back-end driving circuit Touch Drive is configured to perform touch driving, such as providing a touch driving signal Tx.

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

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

[0079] In some embodiments, the first power supply 2 and the second power supply 3 each include a stabilized direct current power supply, the output voltage range of the first power supply 2 is 2.8-4V, and the output voltage range of the second power supply 3 is 7-8V.

[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 ranges provided by the first power supply 2 and the second power supply 3 to the back-end driving circuit Touch Drive include 0-3V, 0-7.6V, -7.6V-3V, and -7.6V-7.6V. That is, the voltage ranges of the back-end driving circuit Touch Drive include the above-mentioned multiple voltage ranges.

[0082] In some embodiments, the first power supply 2 and the second power supply 3 provide the voltage level selection to the back-end drive circuit Touch Drive. The voltage provided to the back-end drive circuit Touch Drive should be selected as a medium or small voltage under the condition of ensuring sufficient touch signal-to-noise ratio according to the specification requirement of power consumption of the display panel and the mutual interference between the touch layer and the display layer in the display panel. For example, if the touch electrode of the display panel is designed as a 1T1R (1T X 1R X , i.e. one touch drive electrode corresponds to one touch sensing electrode) scheme, the load of the display panel is relatively large. In order to ensure high touch signal-to-noise ratio (SNR), the voltage provided to the back-end drive circuit Touch Drive is preferably -7.6V~3V or -7.6V~7.6V. If the touch electrode of the display panel is designed as a 2T1R (2T X 1R X , i.e. two touch drive electrodes correspond to one touch sensing electrode) scheme, the load of the display panel is relatively small. Even if the power supply scheme of the back-end drive circuit Touch Drive with a low voltage difference (such as 0~3V, 0~7.6V, -7.6V~3V) is selected, a relatively good high touch signal-to-noise ratio can also be obtained.

[0083] In some embodiments, as shown in FIG. 2a, the display panel further comprises a third power supply (VDDI) 6 and a fourth power supply (VDDIO) 7, and the touch display integrated circuit 1 further comprises 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 supply for the input / output interface circuit 12, the logic control circuit 13 and the common circuit 113. The fourth power supply 7 provides power supply for the input / output interface circuit 12. As shown in FIG. 2a, the input / output interface circuit 12 is a GPIO (general digital input / output interface) circuit. The logic control circuit 13 is used for digital operation such as amplification, reduction and average value taking. 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 FIG. 2a, the display panel further comprises a flash circuit (Flash) 8 and a host end Host. The flash circuit 8 is used to provide stored signals or data (such as display data) to the touch display integrated circuit 1. The flash circuit 8 is powered by the 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 end Host.

[0086] In some embodiments, as shown in FIG. 2c, the display panel further comprises a third switch 9, which is electrically connected between the third power supply 6 and the touch drive circuit 111 and / or between the third power supply 6 and the display drive circuit 112.

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

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

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

[0090] In some embodiments, as shown in FIG. 2b, the potential of the power supply for the touch display integrated circuit 1 is shown. In some embodiments, the high voltage is converted into the low voltage required by the touch display integrated circuit 1 by a low-dropout linear regulator (Linear Regulator), such as VGH 1 / 2, VINT_P, ELVDD, VGMP, VGSP, VDD, VDDM, ELVSS, VINT_N, VGL 1 / 2. The supply voltage is converted into other voltages required by the touch display integrated circuit 1 by a charge pump (voltage converter), such as VGL, AVEE, VGH. Direct Supply represents the voltage supplied directly, such as AVDD, VCI, VDDI, VDDIO, AVEE, GND, etc. The direct supply voltage is arranged in the order of AVDD>VCI>VDDI>VDDIO>GND>AVEE from top to bottom in FIG. 2b, i.e., the potential of the direct supply voltage decreases in turn. In addition, in FIG. 2b, Gamma, Source, and GOA are circuits in the display drive circuit 112 of the touch display integrated circuit 1. Touch Drive is a back-end drive circuit in the touch drive circuit 111; Touch AFE / ADC is a front-end processing circuit in the touch drive circuit 111. IO is an input-output circuit. Digital Logic (Memory) is a logic circuit and a storage circuit in the 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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