Display device and driving method thereof

Abstract

The invention provides a display device and a driving method thereof. The display device comprises a display panel and a touch control integrated circuit, the display panel comprises a touch control assembly, and the touch control integrated circuit is electrically connected with the negative power supply voltage end of the display panel through an analog-to-digital conversion input port and used for detecting the voltage value of the negative power supply voltage end and outputting the touch control assembly when the voltage value is larger than or equal to a first preset voltage value. The first touch reference value of the touch component is updated into the second touch reference value, and the touch original data is compensated based on the difference value between the touch original data of the touch component and the second touch reference value, or the touch integrated circuit is electrically connected with the positive power supply voltage end and the data voltage end of the display panel through an analog-to-digital conversion input port. And when the voltage difference between the positive power supply voltage end and the data voltage end is greater than or equal to a second preset voltage value, updating and compensating are carried out. The problem that the touch component generates a false alarm point when the display device is in the high-brightness mode or the picture is switched is solved.

Description

Technical Field

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

[0002] In traditional touch display panels, the touch components are usually set on the thin film encapsulation layer (TFE). However, in order to meet the technical requirements of thinness, folding and panel-level packaging (PLP), the thickness of the thin film encapsulation layer is constantly decreasing. At the same time, in order to improve the display effect, the brightness of the touch display panel is also constantly increasing, which leads to an increase in the change amplitude of the voltage signal of the touch display panel. For example, when switching between black and white images, the data voltage of the display panel will change significantly.

[0003] In this technical context, the touch component is easily interfered by the display panel. Specifically, when the display panel switches from a black screen to a white screen, the touch raw data (Rawdata) of the touch component will change significantly, especially when the touch display panel is in high brightness mode. This change is more obvious. This is because there is a large capacitive coupling between the driving electrode and the sensing electrode of the touch component and the cathode of the touch display panel. When the voltage signal of the touch display panel changes, this capacitive coupling will cause the touch raw data to change.

[0004] Such changes in the original touch data may cause the touch component to generate false alarm points, thus affecting the use effect of the touch display panel. Summary of the invention

[0005] The embodiments of the present application provide a display device and a driving method thereof, which are intended to solve the technical problem that a touch component generates false alarm points when the display device is in a high brightness mode or when the screen is switched.

[0006] An embodiment of the present application provides a display device, comprising: a display panel, the display panel comprising a touch component; and a touch integrated circuit, the touch integrated circuit being electrically connected to the touch component, the touch integrated circuit being provided with an analog-to-digital conversion input port, the touch integrated circuit being electrically connected to a negative power supply voltage terminal of the display panel via the analog-to-digital conversion input port, the touch integrated circuit being used to detect a voltage value of the negative power supply voltage terminal, and when the voltage value of the negative power supply voltage terminal is greater than or equal to a first preset voltage value, updating a first touch reference value of the touch component to a second touch reference value, and compensating the touch original data based on a difference between the touch original data of the touch component and the second touch reference value.

[0007] In the above display device, the touch integrated circuit is also used to collect multiple touch raw data of the touch component, compare the multiple touch raw data with the second touch reference value, and perform linear compensation on the multiple touch raw data based on the comparison result.

[0008] In the above display device, the touch control integrated circuit is further used to restore the second touch control reference value to the first touch control reference value when the voltage value of the negative power supply voltage terminal is less than the first preset voltage value.

[0009] An embodiment of the present application also provides a display device, comprising: a display panel, the display panel comprising a touch component; and a touch integrated circuit, the touch integrated circuit being electrically connected to the touch component, the touch integrated circuit being provided with an analog-to-digital conversion input port, the touch integrated circuit being electrically connected to a positive power supply voltage terminal and a data voltage terminal of the display panel through the analog-to-digital conversion input port, the touch integrated circuit being used to detect a voltage value of the positive power supply voltage terminal and a voltage value of the data voltage terminal, and when a voltage difference between the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal is greater than or equal to a second preset voltage value, updating a first touch reference value of the touch component to a second touch reference value, and compensating the touch original data based on a difference between the touch original data of the touch component and the second touch reference value.

[0010] In the above display device, the touch integrated circuit is also used to collect multiple touch raw data of the touch component, compare the multiple touch raw data with the second touch reference value, and perform linear compensation on the multiple touch raw data based on the comparison result.

[0011] In the above display device, the touch control integrated circuit is further used to restore the second touch control reference value to the first touch control reference value when the voltage difference between the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal is less than the second preset voltage value.

[0012] An embodiment of the present application also provides a driving method for a display device, comprising: detecting the voltage value of the negative power supply voltage terminal of the display panel through the analog-to-digital conversion input port of the touch integrated circuit; when the voltage value of the negative power supply voltage terminal is greater than or equal to a first preset voltage value, updating the first touch reference value of the touch component to a second touch reference value; and compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value.

[0013] In the above-mentioned driving method, compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value includes: collecting multiple touch original data of the touch component; comparing the multiple touch original data with the second touch reference value; and linearly compensating the multiple touch original data based on the comparison result.

[0014] An embodiment of the present application also provides a driving method for a display device, comprising: detecting the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal of the display panel through the analog-to-digital conversion input port of the touch integrated circuit; when the voltage difference between the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal is greater than or equal to a second preset voltage value, updating the first touch reference value of the touch component to a second touch reference value; and compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value.

[0015] In the above-mentioned driving method, compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value includes: collecting multiple touch original data of the touch component; comparing the multiple touch original data with the second touch reference value; and linearly compensating the multiple touch original data based on the comparison result.

[0016] In the embodiment of the present application, the touch integrated circuit detects the voltage value of the negative power supply voltage terminal of the display panel, or detects the voltage difference between the positive power supply voltage terminal and the data voltage terminal, and promptly updates the first touch reference value of the touch component to the second touch reference value, and compensates the touch original data based on the difference between the touch original data of the touch component and the second touch reference value, which can effectively eliminate the interference of the display panel to the touch component in the high brightness mode or when the screen is switched, and avoids the touch component from generating false alarm points, thereby improving the reliability of the touch display device. In particular, when the display panel enters the high brightness mode or the screen is switched, the voltage value of the negative power supply voltage terminal of the display panel will change, or the voltage difference between the positive power supply voltage terminal and the data voltage terminal will change. The touch integrated circuit of the present application detects the changes of these voltage values ​​in real time through the analog-to-digital conversion input port, and when it is detected that the voltage value reaches the preset condition, promptly updates the first touch reference value of the touch component to the second touch reference value. After updating the touch reference value, the touch integrated circuit compensates the touch original data based on the difference between the touch original data of the touch component and the updated second touch reference value. Since the operation of updating the first touch reference value to the second touch reference value eliminates the influence of the display panel on the touch component in the current display state, by comparing the touch original data with the second touch reference value, the touch signal generated by the actual touch and the touch signal generated by the display state change can be accurately distinguished, ensuring that when the display state of the display panel changes, the touch component can still accurately identify the actual touch operation, effectively avoiding the problem of false alarm points generated by the touch component. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a display device provided in an embodiment of the present application.

[0018] Figure 2 4 is a schematic diagram showing the difference in original touch data when the display device provided by the embodiment of the present application displays a black image and when the display device displays a white image.

[0019] Figure 3 It is a schematic diagram of a situation where a touch raw data difference is generated when a display device provided by an embodiment of the present application switches from a black screen to a white screen, and a situation where the touch raw data changes when the display device is subjected to a normal touch.

[0020] Figure 4 It is a schematic diagram of the principle of generating touch raw data difference when the display device provided by the embodiment of the present application switches from a black screen to a white screen.

[0021] Figure 5 It is a schematic diagram of a display device provided by an embodiment of the present application performing linear compensation on a plurality of touch original data based on a comparison result between the plurality of touch original data and a second touch reference value. DETAILED DESCRIPTION

[0022] The specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0023] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0024] In the embodiment of the present application, the term "touch raw data" refers to the voltage value obtained by converting the capacitive coupling signal collected by the sensing electrode after the driving electrode sends an excitation signal during the operation of the touch component. Specifically, when the driving electrode outputs a periodic excitation signal, the sensing electrode will sense the corresponding voltage signal due to the mutual capacitance between the driving electrode and the sensing electrode. After the analog-to-digital conversion and signal processing of these sensed voltage signals by the touch integrated circuit, a digital quantity representing the touch state is formed, which is the touch raw data. The touch raw data directly reflects the capacitive coupling state of each touch detection unit of the touch component, and its numerical value is proportional to the capacitive coupling strength at the touch detection unit. It should be noted that the touch raw data will be affected by the display state of the display panel. This is because there is a parasitic capacitance between the cathode of the display panel and the driving electrode and the sensing electrode of the touch component. When the display state (such as brightness) of the display panel changes, the coupling strength of these parasitic capacitances will change accordingly, resulting in a shift in the touch raw data. Therefore, it is necessary to dynamically adjust the touch reference value according to the display state of the display panel to ensure the accuracy of touch detection.

[0025] In an embodiment of the present application, the term "touch reference value" refers to a reference voltage value of the touch raw data output by the touch detection unit of the touch component in a no-touch state. The reference voltage value is used to determine whether a touch operation occurs on the touch component. Specifically, when a finger touches the display panel, the introduction of human body capacitance causes the touch raw data of the touch detection unit at the touch position to change relative to the touch reference value. By comparing the difference between the touch raw data and the touch reference value, the touch integrated circuit can determine the touch position and the touch intensity. In this embodiment, the first touch reference value refers to the touch reference value of the display panel in a normal display state (such as a low brightness state), and the second touch reference value and the third touch reference value refer to the touch reference values ​​of the display panel in a special display state (such as a high brightness state or a screen switching state).

[0026] The embodiments of the present application may be combined with each other.

[0027] like Figure 1As shown, the display device provided in the embodiments of the present application may be, for example, an OLED display device, a Mini-LED display device, or a Micro-LED display device. The embodiments of the present application are described using an OLED display device.

[0028] The display device includes a display panel, a power management chip, a source driving circuit, a timing controller (not shown in the figure), a light emitting controller (not shown in the figure) and a touch integrated circuit. The display panel is electrically connected to the touch integrated circuit, the power management chip and the source driving circuit, and the touch integrated circuit is electrically connected to the power management chip and the source driving circuit.

[0029] The display panel includes a gate drive circuit (GOA), a substrate, a data line, a scan line, a power line, a light control signal line, a pixel array, an encapsulation layer, a polarizer, a color filter, etc. The pixel array is composed of a plurality of pixel units arranged in rows and columns, and each pixel unit includes a light-emitting device and a drive circuit. Each level of the gate drive unit in the gate drive circuit controls a row of pixel units, and the gate drive unit is used to control the thin film transistor device in the drive circuit to realize the gating of the pixel unit. The source drive circuit is used to provide data signals to the pixel unit. The timing controller is used to receive external input image data and synchronization signals, and generate the signals required by the gate drive circuit and the source drive circuit. The power management chip is used to provide the required operating voltage for each part of the display device.

[0030] The display device provided in the embodiment of the present application includes a display panel and a touch integrated circuit. The display panel includes a touch component. The touch component includes a drive electrode and a sensing electrode. The display panel also includes a substrate, a drive device layer, an anode, a light-emitting layer, a cathode, a thin film encapsulation layer, a touch component, a polarizer, an adhesive and a cover plate. The substrate may be, for example, a glass substrate, a flexible substrate (for example, a polyimide substrate), etc. The drive device layer is arranged on the substrate, and the drive device layer includes a drive circuit, and the drive circuit includes a thin film transistor device, and the thin film transistor device is used to control the brightness of the light-emitting device composed of a light-emitting layer, an electron transport layer, a hole transport layer, a cathode and an anode. The thin film transistor device may be a low temperature polycrystalline silicon (LTPS) thin film transistor, a metal oxide thin film transistor, and the light-emitting device is electrically connected to the thin film transistor device. The anode is arranged on the driving device layer and is electrically connected to the driving device layer, the light-emitting layer is arranged on the anode, the cathode is arranged on the light-emitting layer, the thin film encapsulation layer is arranged on the cathode, the encapsulation layer includes an organic / inorganic alternating multilayer structure, the touch component is arranged on the thin film encapsulation layer, the polarizer is arranged on the touch component, the adhesive layer is arranged on the polarizer, and the cover plate is arranged on the adhesive layer. A first capacitor is formed between the driving electrode and the cathode, and the capacitance value of the first capacitor can be, for example, 450 pico-farads. A second capacitor is formed between the sensing electrode and the cathode, and the capacitance value of the second capacitor can be, for example, 250 pico-farads.

[0031] The touch control integrated circuit is provided with an analog-to-digital conversion input port, through which the touch control integrated circuit is electrically connected to the negative power supply voltage terminal ELVSS, the positive power supply voltage terminal ELVDD, the data voltage terminal SOURCE and the horizontal synchronization signal terminal (not shown) of the display panel.

[0032] In actual use of the display panel, when the display screen switches between black and white, the raw touch data of the touch component will change significantly. There is a significant difference in the raw touch data between the white screen and the black screen, especially in the top area of ​​the display panel (corresponding to the sensing electrodes of the 0th to 18th rows of the touch component). The difference is more obvious when the average value of the raw touch data of each column of the touch component is plotted into a curve, and the difference in the raw touch data between the black screen and the white screen can be clearly seen, such as Figure 2 shown.

[0033] like Figure 3 As shown in FIG. 1 , the relatively high touch raw data of the touch component when a black screen is displayed is used as the touch reference value. When a finger touches the display panel, the touch raw data of the touch area will decrease, such as Figure 3 As shown in ① in the figure. The touch component determines the touch position by detecting the difference between the touch raw data and the touch reference value. However, when the display panel switches from a black screen to a white screen, the touch raw data will also decrease. Figure 3 The middle dashed line is lowered to the solid line, e.g. Figure 3 As shown in the middle ②. Figure 3 There is a large difference between the dotted line and the solid line in FIG. 1 , and the reduction of the original touch data may cause the touch integrated circuit to misjudge that a touch has occurred, thereby generating a false alarm point.

[0034] The principle causing the above phenomenon is: Figure 4 As shown, there are a first capacitor Cb_TX and a second capacitor Cb_RX between the driving electrode and the sensing electrode and the cathode, forming a signal path that flows back to the sensing electrode through the cathode. When displaying a black screen, since the voltage value Vdata of the data voltage terminal SOURCE is high, the gate-source voltage Vgs of the driving thin film transistor Drive TFT is small, the on-resistance of the driving thin film transistor Drive TFT is large, the cathode is grounded through the first path Loop1, and the touch original data remains basically stable. When the display panel switches from a black screen to a high-brightness white screen, since the voltage value Vdata of the data voltage terminal SOURCE is small, the gate-source voltage Vgs of the driving thin film transistor Drive TFT becomes large, the on-resistance of the driving thin film transistor Drive TFT becomes small, and the cathode is grounded through the first path Loop1 and the second path Loop2, resulting in a decrease in the touch original data.

[0035] To solve the above problems, this application provides two solutions: The first solution: the touch integrated circuit detects the voltage value of the negative power supply voltage terminal ELVSS through the analog-to-digital conversion input port. When the voltage value of the negative power supply voltage terminal ELVSS is greater than or equal to the first preset voltage value, the touch integrated circuit updates the first touch reference value of the touch component to the second touch reference value, and compensates the touch raw data based on the difference between the touch raw data of the touch component and the second touch reference value.

[0036] The voltage of the negative power supply voltage terminal ELVSS when the display device switches to the high brightness mode (HBM) is different from the voltage of the negative power supply voltage terminal ELVSS when the display device is in other brightness modes, as shown in Table 1. When the touch integrated circuit detects that the voltage of the negative power supply voltage terminal ELVSS is the voltage in the high brightness mode, the touch integrated circuit updates the first touch reference value of the touch component to the second touch reference value, and compensates the touch raw data based on the difference between the touch raw data of the touch component and the second touch reference value.

[0037] Table 1

[0038] Specifically, the touch integrated circuit collects a plurality of touch raw data of the touch component, compares the plurality of touch raw data with the second touch reference value, and performs linear compensation on the plurality of touch raw data based on the comparison result, such as Figure 5 As shown. Through this linear compensation, the touch raw data can be adjusted to a level that is compatible with the second touch reference value, thereby eliminating the interference of the display panel to the touch component in the high brightness mode. When the voltage value of the negative power supply voltage terminal ELVSS is less than the first preset voltage value, the touch integrated circuit restores (switches) the second touch reference value to the first touch reference value.

[0039] The second solution: the touch integrated circuit detects the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE through the analog-to-digital conversion input port. When the voltage difference between the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE is greater than or equal to the second preset voltage value, the touch integrated circuit updates the first touch reference value of the touch component to the second touch reference value, and compensates the touch raw data based on the difference between the touch raw data of the touch component and the second touch reference value.

[0040] Specifically, the touch integrated circuit collects a plurality of touch raw data of the touch component, compares the plurality of touch raw data with the second touch reference value, and performs linear compensation on the plurality of touch raw data based on the comparison result, such as Figure 5 When the voltage difference between the voltage value of the positive power voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE is less than the second preset voltage value, the touch control integrated circuit restores (switches) the second touch control reference value to the first touch control reference value.

[0041] In this embodiment, the touch control integrated circuit is also electrically connected to the horizontal synchronization signal terminal of the display panel through the analog-to-digital conversion input port. The touch control integrated circuit is also used to detect the signal of the horizontal synchronization signal terminal, and determine the screen switching moment of the display panel based on the signal of the horizontal synchronization signal terminal. When the touch control integrated circuit detects the screen switching moment, it triggers the detection of the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE.

[0042] The technical solution of the present application is applicable to display panels using a thin film encapsulation layer, and is particularly applicable to thin and light, foldable display panels and display panels using a panel-level encapsulation process. By detecting the voltage value of the negative power supply voltage terminal ELVSS, or detecting the voltage difference between the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE, the touch reference value is updated in time, thereby eliminating the interference of the display panel to the touch component in high brightness mode or when the screen is switched, and avoiding the touch component from generating false alarm points.

[0043] The first embodiment of the display device provided in the present application includes a display panel and a touch control integrated circuit, wherein the display panel includes a touch control component. The touch control integrated circuit is electrically connected to the touch control component, and the touch control integrated circuit is provided with an analog-to-digital conversion input port. The touch control integrated circuit is electrically connected to the negative power supply voltage terminal ELVSS of the display panel through the analog-to-digital conversion input port, and the touch control integrated circuit is used to detect the voltage value of the negative power supply voltage terminal ELVSS, and when the voltage value of the negative power supply voltage terminal ELVSS is greater than or equal to a first preset voltage value, the first touch control reference value of the touch control component is updated (switched) to a second touch control reference value, and the touch control raw data is compensated based on the difference between the touch control raw data of the touch control component and the second touch control reference value.

[0044] The touch control component adopts capacitive touch control technology and includes a plurality of touch control detection units arranged in rows and columns. The touch control integrated circuit is electrically connected to the touch control component and is used to receive and process touch control signals generated by the touch control component.

[0045] The analog-to-digital conversion input port has multiple input channels for converting analog signals into digital signals. The negative power supply voltage terminal ELVSS is used to provide a negative power supply voltage for the display panel, and the change of the negative power supply voltage can reflect the display state of the display panel.

[0046] The touch control integrated circuit includes a detection module, a processing module, a storage module and a compensation module. The detection module is used to detect the voltage value of the negative power supply voltage terminal ELVSS in real time through the analog-to-digital conversion input port. The processing module is used to update (switch) the first touch control reference value of the touch control component to the second touch control reference value when detecting that the voltage value of the negative power supply voltage terminal ELVSS is greater than or equal to the first preset voltage value, and store the second touch control reference value in the storage module. The first touch control reference value can be the touch control reference value of the display panel in the normal display state, and the second touch control reference value can be the touch control reference value of the display panel in the high brightness mode.

[0047] The compensation module is further configured to read the second touch reference value from the storage module, and compensate the touch raw data based on the difference between the touch raw data of the touch component and the second touch reference value. Specifically, the compensation module may use a linear compensation algorithm to adjust the touch raw data to a level that is compatible with the second touch reference value, thereby eliminating interference of the display panel on the touch component in the high brightness mode.

[0048] The touch control integrated circuit is further used for collecting a plurality of touch control raw data of the touch control component, comparing the plurality of touch control raw data with the second touch control reference value, and performing linear compensation on the plurality of touch control raw data based on the comparison result.

[0049] The touch control integrated circuit also includes a collection module, which is used to collect a plurality of touch control raw data of the touch control component. Specifically, the collection module is used to periodically sample each touch control detection unit of the touch control component according to a preset sampling frequency to obtain a plurality of touch control raw data.

[0050] The compensation module is used to compare the multiple touch raw data with the second touch reference value. In one embodiment, the compensation module is used to compare the touch raw data of each touch detection unit with the second touch reference value of the corresponding position one by one, and calculate the difference between them. In another embodiment, the compensation module is used to first calculate the average value of the multiple touch raw data, and then compare the average value with the second touch reference value.

[0051] Based on the comparison results, the compensation module is used to perform linear compensation on multiple touch raw data. The linear compensation can adopt the proportional coefficient method, that is, according to the difference (degree of difference) between the touch raw data and the second touch reference value, a compensation coefficient is determined, and then the compensation coefficient is applied to the touch raw data, so that the compensated touch raw data is suitable for touch detection based on the second touch reference value. This compensation method can effectively eliminate the influence of display state changes on touch detection.

[0052] The touch control integrated circuit is further configured to restore (switch) the second touch control reference value to the first touch control reference value when the voltage value of the negative power supply voltage terminal ELVSS is less than the first preset voltage value.

[0053] The storage module is also used to store the first touch reference value. The processing module is used to restore (switch) the second touch reference value to the first touch reference value when the voltage value of the negative power supply voltage terminal ELVSS is less than the first preset voltage value. This ensures that the touch detection can be restored (switch) to a normal state in time when the display panel exits the high brightness mode.

[0054] In this embodiment, the acquisition module of the touch integrated circuit adopts a matrix scanning method to collect multiple touch raw data of the touch component row by row and column by column. The acquisition module is used to control the acquisition timing of the touch raw data according to the timing of the timing control unit to ensure that the touch raw data acquisition operation is coordinated with the display drive timing.

[0055] The compensation module is used to compare the collected multiple touch raw data with the second touch reference value. Specifically, the compensation module uses a regional block processing method for comparison, that is, the touch panel is divided into multiple detection areas, the average deviation of the touch raw data in each area is calculated respectively, and then these areas are compensated in a targeted manner.

[0056] The compensation module is used to automatically adjust the compensation parameters according to the signal characteristics of different areas (the linear compensation process uses an adaptive algorithm). The compensation parameters include gain coefficients and offset values, which can be dynamically adjusted according to the size of the voltage difference to achieve more accurate touch raw data compensation.

[0057] Through the above technical solution, the touch control integrated circuit can flexibly adjust the touch control reference value according to the change of the display state, which not only ensures the touch control accuracy in the high brightness mode, but also ensures the touch control performance in the normal display mode. At the same time, by storing the previous touch control reference value, the process of recalculating the reference value is avoided, and the system response speed is improved.

[0058] The touch control integrated circuit also includes a judgment module and a timing module. The judgment module is used to judge whether the voltage value of the negative power supply voltage terminal ELVSS continues to remain above the first preset voltage value for more than a preset time threshold. The timing module is used to record the duration of the voltage value exceeding the first preset voltage value. When the duration exceeds the preset time threshold, the recovery (switching) operation of the reference value is triggered.

[0059] The processing module adopts a gradual switching method, that is, it does not suddenly switch the second touch reference value back to the first touch reference value, but gradually switches from the second touch reference value to the first touch reference value through a gradual transition of multiple intermediate values ​​to avoid jumps in touch detection. This gradual switching method can reduce the possible touch misjudgment during the reference value switching process.

[0060] The processing module is also used to record the switching history of the touch reference value into the storage module. These historical data can be used to optimize the subsequent reference value update (switching) operation. For example, the processing module is used to analyze the change law of the display state according to the recorded data, predict the possible screen switching moment, and prepare for the update (switching) of the reference value in advance before the screen switching moment arrives.

[0061] The second embodiment of the display device provided in the present application is similar to the first embodiment, except that: The display device provided in this embodiment includes a display panel and a touch integrated circuit, and the display panel includes a touch component.

[0062] The touch control integrated circuit is electrically connected to the touch control component, and the touch control integrated circuit is provided with an analog-to-digital conversion input port. The touch control integrated circuit is electrically connected to the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE of the display panel through the analog-to-digital conversion input port. The touch control integrated circuit is used to detect the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE, and when the voltage difference between the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE is greater than or equal to a second preset voltage value, the first touch control reference value of the touch control component is updated (switched) to a second touch control reference value, and the touch control raw data is compensated based on the difference between the touch control raw data of the touch control component and the second touch control reference value. The second touch control reference value can be the touch control reference value of the display panel when displaying a high-brightness picture.

[0063] The display device provided in this embodiment also includes a display panel and a touch integrated circuit, but adopts a different voltage detection scheme. The analog-to-digital conversion input port of the touch integrated circuit is electrically connected to the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE of the display panel at the same time, forming a dual voltage detection path.

[0064] The detection module of the touch control integrated circuit is used to detect the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE. The touch control integrated circuit also includes a calculation module for calculating the voltage difference between the two voltage terminals. The detection module adopts a synchronous sampling method, that is, the two voltage terminals are sampled at the same time to ensure the accuracy of the voltage difference calculation.

[0065] When the voltage difference between the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE is greater than or equal to the second preset voltage value, it indicates that the display panel may have switched screens. At this time, the processing module of the touch IC updates (switches) the first touch reference value of the touch component to the second touch reference value.

[0066] After updating (switching), the compensation module of the touch integrated circuit compensates the touch raw data based on the difference between the touch raw data of the touch component and the second touch reference value to ensure the accuracy of touch detection.

[0067] The processing module of the touch control integrated circuit performs a reference value recovery (switching) operation when the voltage difference between the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE is less than a second preset voltage value. The processing module is used to continuously monitor the voltage difference change trend between the two voltage terminals, and trigger the reference value recovery (switching) operation when the voltage difference drops below the second preset voltage value.

[0068] The touch control integrated circuit is further used for collecting a plurality of touch control raw data of the touch control component, comparing the plurality of touch control raw data with the second touch control reference value, and performing linear compensation on the plurality of touch control raw data based on the comparison result.

[0069] The processing module of the touch control integrated circuit is further used to restore (switch) the second touch control reference value to the first touch control reference value when the voltage difference between the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE is less than the second preset voltage value.

[0070] The touch control integrated circuit is also electrically connected to the row synchronization signal terminal of the display panel through the analog-to-digital conversion input port, and the touch control integrated circuit is also used to detect the signal of the row synchronization signal terminal, and based on the signal of the row synchronization signal terminal, detect the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE.

[0071] Specifically, the detection module is used to monitor the voltage difference between the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE in real time through the analog-to-digital conversion input port, and the judgment module judges the display brightness level of the display panel according to the size of the voltage difference.

[0072] The process of judging the display brightness level includes the following steps: First, the touch integrated circuit sets a plurality of voltage difference thresholds, which divide the display brightness into a plurality of levels, for example, a low brightness level, a medium brightness level and a high brightness level. Among them, the first voltage difference threshold can be set to 2 volts to distinguish between the low brightness level and the medium brightness level, and the second voltage difference threshold can be set to 4 volts to distinguish between the medium brightness level and the high brightness level. When the detected voltage difference is less than the first voltage difference threshold, it is determined that the display panel is at a low brightness level; when the detected voltage difference is greater than or equal to the first voltage difference threshold and less than the second voltage difference threshold, it is determined that the display panel is at a medium brightness level; when the detected voltage difference is greater than or equal to the second voltage difference threshold, it is determined that the display panel is at a high brightness level.

[0073] Based on the determined display brightness level, the processing module is used to selectively update (switch) the touch reference value. Specifically, when the display panel is at a low brightness level, the processing module maintains the first touch reference value and does not update (switch); when the display panel is at a medium brightness level, the processing module updates (switches) the first touch reference value to a second touch reference value, which may be 0.8 times the first touch reference value; when the display panel is at a high brightness level, the processing module updates (switches) the first touch reference value to a third touch reference value, which may be 0.6 times the first touch reference value.

[0074] The present application also provides a driving method for a display device, and the driving method is applicable to the above-mentioned display device.

[0075] A first embodiment of the driving method includes: The detection module of the touch control integrated circuit detects the voltage value of the negative power supply voltage terminal ELVSS of the display panel through the analog-to-digital conversion input port of the touch control integrated circuit.

[0076] When the voltage value of the negative power supply voltage terminal ELVSS is greater than or equal to the first preset voltage value, the processing module of the touch integrated circuit updates (switches) the first touch reference value of the touch component to a second touch reference value, and stores the second touch reference value in the storage module of the touch integrated circuit.

[0077] The storage module also stores the first touch reference value.

[0078] The compensation module of the touch control integrated circuit reads the second touch control reference value from the storage module, and compensates the touch control raw data based on the difference between the touch control raw data of the touch control component and the second touch control reference value. Specifically, the compensation module can use a linear compensation algorithm to adjust the touch control raw data to a level that is compatible with the second touch control reference value, thereby eliminating interference of the display panel on the touch control component in the high brightness mode.

[0079] The compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value comprises: The acquisition module of the touch integrated circuit acquires a plurality of touch raw data of the touch component. Specifically, the acquisition module periodically samples each touch detection unit of the touch component according to a preset sampling frequency to acquire a plurality of touch raw data.

[0080] The compensation module of the touch integrated circuit compares the plurality of touch raw data with the second touch reference value; in one embodiment, the compensation module is used to compare the touch raw data of each touch detection unit with the second touch reference value of the corresponding position one by one, and calculate the difference between them. In another embodiment, the compensation module is used to first calculate the average value of the plurality of touch raw data, and then compare the average value with the second touch reference value.

[0081] The compensation module performs linear compensation on the plurality of touch raw data based on the comparison result. The linear compensation can adopt the proportional coefficient method, that is, a compensation coefficient is determined according to the difference (degree of difference) between the touch raw data and the second touch reference value, and then the compensation coefficient is applied to the touch raw data, so that the compensated touch raw data is suitable for touch detection based on the second touch reference value. This compensation method can effectively eliminate the influence of display state change on touch detection.

[0082] The driving method further comprises: When the voltage value of the negative power supply voltage terminal ELVSS is less than the first preset voltage value, the processing module of the touch control integrated circuit restores (switches) the second touch control reference value to the first touch control reference value, thereby ensuring that the touch control detection can be restored (switched) to a normal state in time when the display panel exits the high brightness mode.

[0083] In this embodiment, the acquisition module of the touch integrated circuit adopts a matrix scanning method to collect multiple touch raw data of the touch component row by row and column by column. The acquisition module controls the acquisition timing of the touch raw data according to the timing of the timing control unit to ensure that the touch raw data acquisition operation is coordinated with the display drive timing.

[0084] The compensation module compares the collected multiple touch raw data with the second touch reference value. Specifically, the compensation module compares the collected multiple touch raw data using a regional block processing method, that is, the touch panel is divided into multiple detection areas, the average deviation of the touch raw data in each area is calculated, and then the areas are compensated in a targeted manner.

[0085] The compensation module automatically adjusts the compensation parameters according to the signal characteristics of different areas (the linear compensation process uses an adaptive algorithm). The compensation parameters include gain coefficients and offset values, which can be dynamically adjusted according to the size of the voltage difference to achieve more accurate touch raw data compensation.

[0086] Through the above technical solution, the touch control integrated circuit can flexibly adjust the touch control reference value according to the change of the display state, which not only ensures the touch control accuracy in the high brightness mode, but also ensures the touch control performance in the normal display mode. At the same time, by storing the previous touch control reference value, the process of recalculating the reference value is avoided, and the system response speed is improved.

[0087] The determination module of the touch control integrated circuit determines whether the voltage value of the negative power supply voltage terminal ELVSS is continuously maintained above the first preset voltage value for more than a preset time threshold. The timing module of the touch control integrated circuit records the duration of the voltage value exceeding the first preset voltage value. When the duration exceeds the preset time threshold, the recovery (switching) operation of the reference value is triggered.

[0088] The processing module adopts a gradual switching method, that is, it does not suddenly switch the second touch reference value back to the first touch reference value, but gradually switches from the second touch reference value to the first touch reference value through a gradual transition of multiple intermediate values ​​to avoid jumps in touch detection. This gradual switching method can reduce the possible touch misjudgment during the reference value switching process.

[0089] The processing module records the switching history of the touch reference value in the storage module. These historical data can be used to optimize the subsequent reference value update (switching) operation. For example, the processing module analyzes the changing rules of the display state based on the recorded data, predicts the possible screen switching moment, and prepares for the update (switching) of the reference value in advance before the screen switching moment arrives.

[0090] The driving method further comprises: When it is detected that the voltage value of the negative power voltage terminal ELVSS is less than the first preset voltage value, the processing module of the touch control integrated circuit keeps the touch control reference value unchanged.

[0091] The second embodiment of the driving method of the display device provided in the present application is similar to the first embodiment, except that: The driving method of the display device provided in this embodiment includes: The detection module detects the voltage value of the positive power voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE of the display panel through the analog-to-digital conversion input port of the touch integrated circuit.

[0092] When the voltage difference between the voltage value of the positive power voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE is greater than or equal to a second preset voltage value, the processing module updates (switches) the first touch reference value of the touch component to a second touch reference value.

[0093] The compensation module compensates the touch original data based on the difference between the touch original data of the touch component and the second touch reference value.

[0094] The detection module of the touch control integrated circuit detects the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE. The calculation module of the touch control integrated circuit calculates the voltage difference between the two voltage terminals. The detection module adopts a synchronous sampling method, that is, the two voltage terminals are sampled at the same time to ensure the accuracy of the calculation of the voltage difference.

[0095] When the voltage difference between the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE is greater than or equal to the second preset voltage value, it indicates that the display panel may have switched screens. At this time, the processing module updates (switches) the first touch reference value of the touch component to the second touch reference value.

[0096] After updating (switching), the compensation module compensates the original touch data based on the difference between the original touch data of the touch component and the second touch reference value to ensure the accuracy of touch detection.

[0097] The processing module performs a reference value recovery (switching) operation when the voltage difference between the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE is less than a second preset voltage value. The processing module continuously monitors the voltage difference change trend of the two voltage terminals, and triggers the reference value recovery (switching) operation when the voltage difference decreases below the second preset voltage value.

[0098] The compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value comprises: The acquisition module acquires a plurality of touch raw data of the touch component. The compensation module compares the plurality of touch raw data with the second touch reference value, and performs linear compensation on the plurality of touch raw data based on the comparison result.

[0099] The processing module restores (switches) the second touch reference value to the first touch reference value when the voltage difference between the voltage value of the positive power voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE is less than the second preset voltage value.

[0100] The driving method further comprises: The detection module determines the display brightness level of the display panel according to the voltage difference between the voltage value of the positive power voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE; and The processing module selectively updates (switches) the touch reference value based on the display brightness level.

[0101] The detection module detects the signal of the horizontal synchronization signal terminal, and based on the signal of the horizontal synchronization signal terminal, detects the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE.

[0102] The detection module monitors the voltage difference between the voltage value of the positive power supply voltage terminal ELVDD and the voltage value of the data voltage terminal SOURCE in real time through the analog-to-digital conversion input port, and the judgment module judges the display brightness level of the display panel according to the voltage difference.

[0103] The process of judging the display brightness level includes the following steps: First, the touch integrated circuit sets a plurality of voltage difference thresholds, which divide the display brightness into a plurality of levels, for example, a low brightness level, a medium brightness level and a high brightness level. Among them, the first voltage difference threshold can be set to 2 volts to distinguish between the low brightness level and the medium brightness level, and the second voltage difference threshold can be set to 4 volts to distinguish between the medium brightness level and the high brightness level. When the detected voltage difference is less than the first voltage difference threshold, it is determined that the display panel is at a low brightness level; when the detected voltage difference is greater than or equal to the first voltage difference threshold and less than the second voltage difference threshold, it is determined that the display panel is at a medium brightness level; when the detected voltage difference is greater than or equal to the second voltage difference threshold, it is determined that the display panel is at a high brightness level.

[0104] Based on the determined display brightness level, the processing module selectively updates (switches) the touch reference value. Specifically, when the display panel is at a low brightness level, the processing module maintains the first touch reference value and does not update (switch); when the display panel is at a medium brightness level, the processing module updates (switches) the first touch reference value to a second touch reference value, which may be 0.8 times the first touch reference value; when the display panel is at a high brightness level, the processing module updates (switches) the first touch reference value to a third touch reference value, which may be 0.6 times the first touch reference value.

[0105] In the embodiment of the present application, the touch integrated circuit detects the voltage value of the negative power supply voltage terminal ELVSS of the display panel, or detects the voltage difference between the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE, timely updates the first touch reference value of the touch component to the second touch reference value, and compensates the touch original data based on the difference between the touch original data of the touch component and the second touch reference value, which can effectively eliminate the interference of the display panel to the touch component in the high brightness mode or when the screen is switched, and avoids the touch component from generating false alarm points, thereby improving the reliability of the touch display device. In particular, when the display panel enters the high brightness mode or the screen is switched, the voltage value of the negative power supply voltage terminal ELVSS of the display panel will change, or the voltage difference between the positive power supply voltage terminal ELVDD and the data voltage terminal SOURCE will change. The touch integrated circuit of the present application detects the changes of these voltage values ​​in real time through the analog-to-digital conversion input port, and when it is detected that the voltage value reaches the preset condition, timely updates the first touch reference value of the touch component to the second touch reference value. After updating the touch reference value, the touch integrated circuit compensates the touch raw data based on the difference between the touch raw data of the touch component and the updated second touch reference value. Since the operation of updating the first touch reference value to the second touch reference value eliminates the influence of the display panel on the touch component in the current display state, by comparing the touch raw data with the second touch reference value, the touch signal generated by the actual touch and the touch signal generated by the display state change can be accurately distinguished, ensuring that when the display state of the display panel changes, the touch component can still accurately identify the actual touch operation, effectively avoiding the problem of false alarm points generated by the touch component. The technical solution of the present application is suitable for application scenarios where the display panel switches screens quickly.

[0106] The embodiments of the present application are described in detail above, and the contents of this specification should not be construed as limiting the scope of protection of the present application.

Claims

1. A display device, characterized in that: include: A display panel, wherein the display panel includes a touch control component; as well as A touch integrated circuit, wherein the touch integrated circuit is electrically connected to the touch component, the touch integrated circuit is provided with an analog-to-digital conversion input port, the touch integrated circuit is electrically connected to the negative power supply voltage terminal of the display panel through the analog-to-digital conversion input port, the touch integrated circuit is used to detect the voltage value of the negative power supply voltage terminal, and when the voltage value of the negative power supply voltage terminal is greater than or equal to a first preset voltage value, the first touch reference value of the touch component is updated to a second touch reference value, and the touch original data is compensated based on the difference between the touch original data of the touch component and the second touch reference value.

2. The display device according to claim 1, wherein: The touch control integrated circuit is further used for collecting a plurality of touch control raw data of the touch control component, comparing the plurality of touch control raw data with the second touch control reference value, and performing linear compensation on the plurality of touch control raw data based on the comparison result.

3. The display device according to claim 1, wherein: The touch control integrated circuit is further configured to restore the second touch control reference value to the first touch control reference value when the voltage value at the negative power supply voltage terminal is less than the first preset voltage value.

4. A display device, characterized in that: include: A display panel, wherein the display panel includes a touch control component; as well as A touch control integrated circuit, wherein the touch control integrated circuit is electrically connected to the touch control component, and the touch control integrated circuit is provided with an analog-to-digital conversion input port. The touch control integrated circuit is electrically connected to the positive power supply voltage terminal and the data voltage terminal of the display panel through the analog-to-digital conversion input port. The touch control integrated circuit is used to detect the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal, and when the voltage difference between the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal is greater than or equal to a second preset voltage value, the first touch control reference value of the touch control component is updated to a second touch control reference value, and the touch control original data is compensated based on the difference between the touch control original data of the touch control component and the second touch control reference value.

5. The display device according to claim 4, characterized in that The touch control integrated circuit is further used for collecting a plurality of touch control raw data of the touch control component, comparing the plurality of touch control raw data with the second touch control reference value, and performing linear compensation on the plurality of touch control raw data based on the comparison result.

6. The display device according to claim 4, characterized in that The touch control integrated circuit is further configured to restore the second touch control reference value to the first touch control reference value when a voltage difference between a voltage value at the positive power supply voltage terminal and a voltage value at the data voltage terminal is less than the second preset voltage value.

7. A method for driving a display device, characterized in that: include: Detecting the voltage value of the negative power supply voltage terminal of the display panel through the analog-to-digital conversion input port of the touch integrated circuit; When the voltage value of the negative power supply voltage terminal is greater than or equal to the first preset voltage value, updating the first touch reference value of the touch component to a second touch reference value; as well as The touch raw data is compensated based on the difference between the touch raw data of the touch component and the second touch reference value.

8. The driving method according to claim 7, characterized in that: The compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value comprises: Collecting a plurality of touch raw data of the touch component; comparing the plurality of touch raw data with the second touch reference value; and Based on the comparison result, linear compensation is performed on the plurality of touch raw data.

9. A method for driving a display device, characterized in that: include: Detecting the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal of the display panel through the analog-to-digital conversion input port of the touch integrated circuit; When the voltage difference between the voltage value of the positive power supply voltage terminal and the voltage value of the data voltage terminal is greater than or equal to a second preset voltage value, updating the first touch reference value of the touch component to a second touch reference value; as well as The touch raw data is compensated based on the difference between the touch raw data of the touch component and the second touch reference value.

10. The driving method according to claim 9, characterized in that: The compensating the touch original data based on the difference between the touch original data of the touch component and the second touch reference value comprises: Collecting a plurality of touch raw data of the touch component; comparing the plurality of touch raw data with the second touch reference value; and Based on the comparison result, linear compensation is performed on the plurality of touch raw data.

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