Security detection method for display device and related touch control circuit and touch and display driver integration

Abstract

The invention relates to a security detection method for a display device and a related touch control circuit and touch and display drive integration. A touch control circuit for a display device includes a plurality of analog-to-digital converters and a controller. Each of the plurality of analog-to-digital converters is coupled to at least one of a plurality of touch sensing electrodes of the display device and at least one of a plurality of source drivers of the display device. Wherein the at least one analog-to-digital converter is configured to generate a first measurement digital code according to an output voltage of at least one of the plurality of source drivers. The controller is configured to compare the first measurement digital code with an input digital code corresponding to the output voltage of the at least one of the plurality of source drivers, thereby generating a first security detection result about the at least one of the plurality of source drivers.

Description

Technical Field

[0001] The present invention relates to the security detection of integrated circuits, and particularly to a security detection method and related touch control circuits and touch and display driver integration. Background Art

[0002] Automotive integrated circuits are custom-designed for specific applications in automotive electronic systems. Such integrated circuits are carefully designed to meet the stringent requirements of automotive applications, such as high reliability, durability, and compliance with automotive safety standards such as ISO 26262. Generally speaking, automotive integrated circuits provide a variety of functions in vehicle systems, including: engine control units, sensor interfaces, infotainment systems, and advanced driver assistance systems (ADAS). Considering the high requirements for reliability and durability, the ISO26262 standard defines 4 safety levels: ASIL-A, ASIL-B, ASIL-C, and ASIL-D. Generally, vehicle components such as instrument panels, passenger-side panels, rearview mirrors, rear-seat entertainment devices, and door handles need to reach at least the ASIL-B safety level. The standards required to meet the ASIL-B level include: the single point fault metric (SPFM) is greater than or equal to 90%, and the latent fault metric (LFM) is greater than or equal to 60%. In the application of automotive touch and display driver integration (TDDI) ICs, the source driver is important in terms of the number of transistors and the proportion of the TDDI IC circuit area. Without a dedicated security detection circuit designed for the source driver, it is difficult to achieve a single point fault metric of 90%.

[0003] However, there are significant challenges in designing a dedicated security detection circuit for the source driver. Since the source driver usually has a large number of channels, configuring a dedicated security detection circuit for each channel will inevitably lead to a significant increase in the overall circuit area of the automotive TDDI IC. To avoid this problem, the design of the security detection circuit can be further considered for simplification, but this may lead to a reduction in detection accuracy. Thus, the prior art faces problems to be solved when designing a security detection circuit for the source driver of automotive TDDI ICs. Summary of the Invention

[0004] In view of this, in order to overcome the design challenges of the safety detection circuit for the source driver and other analog voltage output circuits in the automotive TDDIIC, the present invention proposes a novel safety detection method and related touch control circuit. In an embodiment of the present invention, the analog-to-digital converters in the touch control circuit of the TDDIIC are used to implement the safety detection of the source driver. Since these analog-to-digital converters are idle during non-touch sensing, applying them to the safety detection of the source driver will not interfere with the normal operation of the touch control circuit. In addition, the safety detection method and related touch control circuit of the present invention can also be applied to other analog circuits in the automotive display device (such as, voltage regulator and charge pump converter) to monitor the safety of their output voltages, effectively eliminating potential errors and abnormal output voltages that may be caused by various reasons in the above circuits. Therefore, the present invention significantly improves the reliability of the automotive TDDIIC, thereby greatly improving the safety of the vehicle system.

[0005] An embodiment of the present invention provides a touch control circuit for a display device. The touch control circuit includes: a plurality of analog-to-digital converters and a controller. Each of the plurality of analog-to-digital converters is coupled to at least one of a plurality of touch sensing electrodes of the display device and at least one of a plurality of source drivers of the display device; wherein, at least one of the plurality of analog-to-digital converters is configured to generate a first measured digital code according to an output voltage output by at least one of the plurality of source drivers. The controller is coupled to the plurality of analog-to-digital converters and is configured to compare the first measured digital code with an input digital code corresponding to the output voltage of at least one of the plurality of source drivers, thereby generating a first safety detection result regarding at least one of the plurality of source drivers.

[0006] An embodiment of the present invention provides a safety detection method for a display device. The safety detection method includes: providing a touch control circuit having a plurality of analog-to-digital converters, each of the plurality of analog-to-digital converters being coupled to at least one of a plurality of touch sensing electrodes of the display device and at least one of a plurality of source drivers of the display device; using at least one of the plurality of analog-to-digital converters to generate a first measured digital code according to an output voltage output by at least one of the plurality of source drivers; comparing the first measured digital code with an input digital code corresponding to the output voltage of at least one of the plurality of source drivers, thereby generating a first safety detection result regarding at least one of the plurality of source drivers. Description of the Drawings

[0007] Figure 1 Schematic diagram showing the architecture of the display device according to an embodiment of the present invention.

[0008] Figure 2 Schematic diagram showing the detailed architecture of the TDDIIC and the display device according to an embodiment of the present invention.

[0009] Figure 3 and Figure 4 Showing the operation cycle and enable cycle of the analog-to-digital converter of the TDDIIC and the display device.

[0010] Figure 5 Showing a security detection method for a display device according to an embodiment of the present invention.

[0011] Symbol Description

[0012] 10 Display device

[0013] 100 Touch control circuit

[0014] 200 Display driving circuit

[0015] 300 Display panel

[0016] 400 Timing controller

[0017] S0~SP Source electrode

[0018] G0~GQ Gate electrode

[0019] TD0~TDR Touch driving electrode

[0020] TS0~TST Touch sensing electrode

[0021] 110_1~110_K Voltage conversion circuit

[0022] 120_1~120_K Analog-to-digital converter

[0023] 130 Controller

[0024] 210 Latch circuit

[0025] 211 First latch

[0026] 212_1~212_4 Second latch

[0027] 220_1~220_4 Digital-to-analog converter

[0028] 230_1~230_4 Source driver

[0029] 500_1 - 500_2 Multiplexer

[0030] 600 Analog Circuit Detailed Implementation Manner

[0031] In the following text, many specific details are described to provide the reader with a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand how to implement the present invention in the absence of one or more specific details, or by using other methods, elements, or materials, etc. In other cases, well-known structures, materials, or operations will not be shown or described in detail, so as to avoid obscuring the core concepts of the present invention.

[0032] The "one embodiment" mentioned in the specification means that the specific features, structures, or characteristics described in that embodiment may be included in at least one embodiment of the present invention. Therefore, the phrase "in one embodiment" that appears throughout this specification does not necessarily refer to the same embodiment. In addition, the aforementioned specific features, structures, or characteristics may be combined in any suitable form in one or more embodiments.

[0033] Please refer to Figure 1 , which depicts a schematic diagram of the architecture of a display device according to an embodiment of the present invention. As shown in the figure, the display device 10 is a display with touch function, and includes a display panel 300 and a Touch And Display Driver Integration Integrated Circuit (TDDIIC) 50. The display device 10 is controlled by the TDDIIC 50, and the TDDIIC 50 includes a touch control circuit 100, a display driving circuit 200, and a timing controller 400. The touch control circuit 100 is used to sense touch inputs on the display panel 300 of the display device 10, enabling users to interact with the display device 10. This sensing involves processing signals corresponding to touch events (such as clicks or swipes) occurring on the surface of the display panel 300. On the other hand, the display driving circuit 200 is used to control the pixel circuits in the display panel 300, and its function is to accurately present visual content (such as videos or images) by manipulating pixel behaviors (such as color and brightness) according to the video / image data and timing signals provided by the timing controller 400. The timing controller 400 is used to synchronize the operations of the touch control circuit 100 and the display driving circuit 200, thereby ensuring that the touch sensing and display presentation processes can be perfectly coordinated.

[0034] As Figure 1As shown, the display panel 300 adopts a complex electrode arrangement for pixel control and touch sensing. Specifically, the source electrodes S0 to SP and the gate electrodes G0 to GQ are strategically arranged on the display panel 300. Among them, the source electrodes S0 to SP are used to provide pixel driving voltages to the pixel circuits, while the gate electrodes G0 to GQ are used to control the timing of providing pixel driving voltages to individual pixel circuits. And the source electrodes S0 to SP and the gate electrodes G0 to GQ are mainly controlled by the display driving circuit 200. In addition, the display panel 300 also includes touch driving electrodes TD0 to TDR and touch sensing electrodes TS0 to TST. The touch driving electrodes TD0 to TDR are used to emit an electric field, while the touch sensing electrodes TS0 to TST are used to sense the change in the electric field caused by the user's touch. This setting enables the touch control circuit 100 to accurately detect and analyze touch inputs on the surface of the display panel 300. Note that Figure 1 The specific arrangement and quantity of the shown source electrodes S0 to SP, gate electrodes G0 to GQ, touch driving electrodes TD0 to TDR, and touch sensing electrodes TS0 to TST are only examples and are not intended to limit the scope of the present invention. They are for illustrative purposes only, showing one of the many possible configurations that can achieve the required functions within the scope of the present invention.

[0035] Please refer to Figure 2, which depicts a detailed schematic diagram of the TDDIIC and the display device according to an embodiment of the present invention. As shown in the figure, the display driving circuit 200 includes a latch circuit 210, a plurality of digital-to-analog converters (DACs) 220_1 - 220_N, and a plurality of source drivers 230_1 - 230_N. The latch circuit 210 includes a first latch 211 and a plurality of second latches 212_1 - 212_N. During the display driving of the TDDIIC 50 and the display device 10, the timing controller 400 is configured to send the image data to be displayed to the first latch 211 of the latch circuit 210. After the first latch 211 completely receives a row (horizontal) of image data of the image, the row of image data is then passed to the plurality of second latches 212_1 - 212_N of the latch circuit 210. Each of the second latches 212_1 - 212_N is configured to receive and output a specific data segment of the row of image data (e.g., data related to the RGB sub-pixels on the horizontal line of the row) to one of the digital-to-analog converters 220_1 - 220_N. Correspondingly, each of the digital-to-analog converters 220_1 - 220_N is configured to convert the data segment it receives into a converted analog voltage and send it to the corresponding one of the source drivers 230_1 - 230_N. Then, the source drivers 230_1 - 230_N apply the converted analog voltage they receive to the corresponding one of the source electrodes S0 - SP (as the pixel driving voltage), thereby controlling the corresponding pixel circuits on the display panel 300 to display the image row by row.

[0036] The touch control circuit 100 includes a plurality of voltage conversion circuits 110_1 - 110_K (selectively provided), a plurality of analog-to-digital converters (ADCs) 120_1 - 120_K, and a controller 130. During the touch sensing of the TDDIIC 50 and the display device 10, the analog-to-digital converters 120_1 - 20_K are configured to convert the analog voltages sensed on the touch sensing electrodes TS0 - TST (these voltages are used to indicate touch actions on the display panel 300) into digital touch sensing signals (in the form of digital codes) respectively. The generated touch sensing signals include the intensity, position, and other relevant touch attributes detected by the touch sensing electrodes TS0 - TST. After the signals are generated, these digital touch sensing signals are then passed to the controller 130. The controller 130 is configured to analyze these digital touch sensing signals to determine the occurrence, nature, and details of one or more touch events on the display panel 300. Moreover, the controller 130 analyzes the incoming data to distinguish various touch gestures, thereby achieving accurate and sensitive touch interaction with the display device 10.

[0037] During the security detection of the TDDIIC 50 and the display device 10, the outputs of the source drivers 230_1 to 230_N are coupled to the touch control circuit 100 through multiplexers 500_1 to 500_J (not fully shown) and switches. In one embodiment, the output voltages of the source drivers 230_1 - 230_N can first be introduced into the voltage conversion circuits 110_1 to 110_K, which can adjust / shift the output voltages to the converted voltages to conform to the input voltage ranges of the analog-to-digital converters 120_1 to 120_K. However, within the scope of the present invention, this signal transmission method through the voltage conversion circuits 110_1 to 110_K is not the only possible configuration. In other embodiments of the present invention, the output voltages of the source drivers 230_1 to 230_N can be directly fed into the analog-to-digital converters 120_1 to 120_K, ignoring any adjustment of the voltage levels. Furthermore, the main function of the voltage conversion circuits 110_1 to 110_K is to correct the output voltages of the source drivers 230_1 to 230_N so that they can be aligned with the input voltage ranges of the analog-to-digital converters 120_1 to 120_K. The input voltage range is usually defined as the range of voltage levels that the analog-to-digital converters 120_1 to 120_K can accurately resolve. Generally speaking, the input voltage ranges of the analog-to-digital converters 120_1 to 120_K are limited, and input voltages outside the input voltage range may cause the analog-to-digital converters 120_1 to 120_K to generate inaccurate digital values. This is because the analog-to-digital converters 120_1 to 120_K are designed to convert voltages within their rated ranges. Therefore, the function of the voltage conversion circuits 110_1 to 110_K can adjust / shift any input voltages that are outside or below the input voltage ranges of the analog-to-digital converters 120_1 to 120_K. In this way, it can be ensured that the voltages fall within the ranges that the analog-to-digital converters 120_1 to 120_K can accurately process, thus guaranteeing reliable and accurate digital conversion of the input signals.

[0038] The analog-to-digital converters 120_1 to 120_K of the touch control circuit 100 are used to convert the output voltages of the source drivers 230_1 to 230_N or the transferred voltages generated by the voltage conversion circuits 110_1 to 110_K into corresponding measured digital codes. The controller 130 is used to perform a comparison analysis between the measured digital codes and predefined input digital codes. Specifically, the input digital codes are data segments of an image row, which are fed into each of the digital-to-analog converters 220_1 to 220_N separately and individually. If the input digital codes do not match the measured digital codes, this indicates that there may be a potential fault in a corresponding one of the source drivers 230_1 to 230_N or a corresponding one of the digital-to-analog converters 220_1 to 220_N. This is because the input digital codes fed into each of the digital-to-analog converters 220_1 to 220_N should be consistent with the measured digital codes generated by a corresponding one of the analog-to-digital converters 120_1 to 120_K. Therefore, the controller 130 generates a security detection result based on the measured digital codes and the input digital codes to indicate whether each of the source drivers 230_1 to 230_N is operating normally without faults. In one embodiment, the controller 130 can be integrated as part of the timing controller 400.

[0039] The security detection provided by the present invention is mainly based on the time-sharing utilization of the analog-to-digital converters 120_1 to 120_K. Please refer to Figure 3 and Figure 4 for further understanding. Generally, the analog-to-digital converters 120_1 to 120_K are triggered / activated during the touch sensing period in the Long-V mode or Long-H mode to convert the voltages sensed on the touch sensing electrodes. Among them, the Long-V mode is inter-frame touch driving, which means that the touch sensing operation is performed during the interval between two display frames (i.e., the blanking period), and the Long-H mode is intra-frame touch driving, which means that the touch sensing operation is inserted and performed within one display frame. In the present invention, the analog-to-digital converters 120_1 to 120_K are used for security detection during the display driving of the TDDIIC 50 and the display device 10. Since the touch sensing operation only needs to be performed during the touch sensing period of the TDDIIC 50 and the display device 10, the analog-to-digital converters 120_1 to 120_K can be used for other purposes during the non-touch sensing period. Therefore, the analog-to-digital converters 120_1 to 120_K can be enabled / triggered during the non-touch sensing period of the TDDIIC 50 and the display device 10 (e.g., during the display driving period or the porch period) for security detection.

[0040] The number of source drivers 230_1 to 230_N may not be the same as the number of analog-to-digital converters 120_1 to 120_K of the touch control circuit 100, and the number of source drivers 230_1 - 230_N is generally larger than the number of analog-to-digital converters 120_1 to 120_K of the touch control circuit 100. Given the limited number of available analog-to-digital converters 120_1 to 120_K, it is not possible to perform security detection on all source drivers 230_1 to 230_N simultaneously. Therefore, in some embodiments, the security detection may need to be performed in batches. That is, during a security detection period, only a part of the source drivers 230_1 to 230_N are subjected to security detection. In some embodiments, the security detection of the first part of the source drivers 230_1 to 230_N can be performed during the display driving period when the display panel 300 displays a first frame, and the security detection of the second part of the source drivers 230_1 to 230_N can be performed during the display driving period when the display panel 300 displays a second frame.

[0041] In one embodiment, the security detection mechanism provided by the present invention can be further applied to one or more analog circuits 600 of the display device 10. Among them, the one or more analog circuits 600 may include at least one of at least one voltage regulator (e.g., a low-dropout regulator (LDO)), a charge pump, a gamma voltage generator, and a gate voltage generator of the display device 10.

[0042] In addition, since the output voltages of one or more analog circuits 600 may exceed or fall below the input voltage range of the analog-to-digital converters 120_1 to 120_K, these output voltages may need to be adjusted to an appropriate level before being read and converted by the analog-to-digital converters 120_1 to 120_K. However, the output voltages of not every one of the one or more analog circuits 600 requires such adjustment. In some cases, the output voltages of the one or more analog circuits 600 can be directly read and converted by the analog-to-digital converters 120_1 to 120_K without any pre-adjustment to the transferred voltage. In addition, the output voltages of the one or more analog circuits 600, or their corresponding transferred voltages, are converted by the analog-to-digital converters 120_1 to 120_K into measured digital codes. The converted measured digital codes will be compared with a target digital code range. This target digital code range represents a predetermined range of the output voltages of the one or more analog circuits 600. If the measured digital codes exceed or fall below the predetermined range of the output voltages of the one or more analog circuits 600, this represents a potential fault in the one or more analog circuits 600. Therefore, the controller 130 will generate a safety detection result indicating whether each of the one or more analog circuits 600 is operating properly without any faults. In various embodiments of the present invention, the safety detection of the one or more analog circuits 600 can be performed during any non-touch sensing period (e.g., during display driving, or during a porch period) of the TDDI IC 50 and the display device 10.

[0043] Figure 5 Disclosed is a safety detection method for a display device according to an embodiment of the present invention. As shown in the figure, the method of the present invention includes the following simplified processes:

[0044] S110: Provide a touch control circuit having a plurality of analog-to-digital converters, each of the plurality of analog-to-digital converters being coupled to at least one of a plurality of touch sensing electrodes of the display device and at least one of a plurality of source drivers of the display device;

[0045] S120: Use at least one of the plurality of analog-to-digital converters to generate a first measured digital code according to an output voltage output by at least one of the plurality of source drivers; and

[0046] S130: Compare the first measured digital code with an input digital code corresponding to the output voltage of the at least one of the plurality of source drivers, thereby generating a first safety detection result regarding the at least one of the plurality of source drivers.

[0047] Since the principles and specific details of the above steps have been explained in detail through the above embodiments, they will not be described again here. It should be noted that the above process may be improved by adding other additional steps or making appropriate modifications and adjustments to better enhance flexibility and further improve the performance and efficiency of the TDDIIC.

[0048] The above are only the preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims

1. A touch control circuit for a display device, comprising: a plurality of analog-to-digital converters, each analog-to-digital converter being coupled to at least one of the plurality of touch sensing electrodes of the display device and at least one of the plurality of source drivers of the display device, wherein at least one analog-to-digital converter of the plurality of analog-to-digital converters is configured to generate a first measurement digital code according to an output voltage output by at least one of the plurality of source drivers; and A controller, coupled to the multiple analog-to-digital converters, is used to compare the first measured digital code with an input digital code corresponding to the output voltage of at least one of the multiple source drivers, thereby generating a first safety detection result regarding the at least one of the multiple source drivers.

2. The touch control circuit of claim 1 , wherein the plurality of source drivers are included in a display driving circuit of the display device, the display driving circuit is used to apply voltages to a plurality of source electrodes of the display device, and the display driving circuit includes a plurality of digital-to-analog converters, each of the digital-to-analog converters is used to generate a converted voltage according to an input digital code, and each of the plurality of source drivers is used to generate an output voltage to at least one of the plurality of source electrodes according to the converted voltage.

3. The touch control circuit as claimed in claim 1, wherein the touch control circuit further comprises: At least one voltage conversion circuit is coupled to at least one of the multiple analog-to-digital converters, and is used to generate a transferred voltage based on the output voltage output by at least one of the multiple source drivers, and at least one of the multiple analog-to-digital converters is used to convert the transferred voltage into the first measurement digital code.

4. The touch control circuit as described in claim 1, wherein at least one of the multiple analog-to-digital converters is coupled to an analog circuit of the display device and is used to generate a second measurement digital code according to an output voltage of the analog circuit; the controller is used to compare the second measurement digital code with a reference digital code range corresponding to the output voltage of the analog circuit, thereby generating a second safety detection result regarding the analog circuit. 5 . The touch control circuit as claimed in claim 4 , wherein the analog circuit comprises at least one of a regulator, a charge pump, a gamma voltage generator and a gate voltage generator.

6. The touch control circuit as claimed in claim 4, further comprising: At least one voltage conversion circuit is coupled to at least one of the multiple analog-to-digital converters, and is used to generate a transferred voltage according to the output voltage of the analog circuit, and at least one of the multiple analog-to-digital converters is used to convert the transferred voltage into the second measurement digital code.

7. The touch control circuit of claim 1 , wherein the at least one of the multiple analog-to-digital converters is used to generate the first measurement digital code according to the output voltage output by the at least one of the multiple source drivers during a display period of the display device, and is used to generate a touch sensing digital code according to a voltage sensed on at least one of the multiple touch sensing electrodes during a touch sensing period of the display device.

8. The touch control circuit of claim 1 , wherein the at least one of the plurality of analog-to-digital converters is used to generate a third measurement digital code according to an output voltage output by a first source driver among the plurality of source drivers during a first display period when the display device displays a first frame, and is used to generate a fourth measurement digital code according to an output voltage output by a second source driver among the plurality of source drivers during a second display period when the display device displays the first frame; wherein the first display period and the second display period are separated by a touch sensing period of the display device. 9 . The touch control circuit as claimed in claim 1 , wherein the controller is included in a timing controller of the display device. 10 . A touch control and display driver integration, comprising the touch control circuit as claimed in claim 1 .

11. A security detection method for a display device, comprising: A touch control circuit is provided having a plurality of analog-to-digital converters, each of the plurality of analog-to-digital converters being coupled to at least one of a plurality of touch sensing electrodes of the display device and at least one of a plurality of source drivers of the display device; Using at least one analog-to-digital converter among the plurality of analog-to-digital converters to generate a first measurement digital code according to an output voltage output by at least one of the plurality of source drivers; as well as The first measurement digital code is compared with an input digital code corresponding to the output voltage of the at least one of the plurality of source drivers, thereby generating a first safety detection result regarding the at least one of the plurality of source drivers.

12. A safety detection method as described in claim 11, wherein the multiple source drivers are included in a display driving circuit of the display device, the display driving circuit is used to apply voltage to multiple source electrodes of the display device, and the display driving circuit includes multiple digital-to-analog converters, each digital-to-analog converter is used to generate a converted voltage according to an input digital code, and each of the multiple source drivers is used to generate an output voltage to at least one of the multiple source electrodes according to the converted voltage.

13. The safety detection method according to claim 11, further comprising: providing at least one voltage conversion circuit, the voltage conversion circuit being coupled to the at least one of the plurality of analog-to-digital converters; Utilizing the at least one voltage conversion circuit to generate a transferred voltage according to the output voltage output by the at least one of the plurality of source drivers; and The at least one of the plurality of analog-to-digital converters is utilized to convert the transferred voltage into the first measurement digital code.

14. The safety detection method according to claim 11, further comprising: generating a second measurement digital code according to an output voltage of an analog circuit using the at least one of the plurality of analog-to-digital converters; and The second measured digital code is compared with a reference digital code range corresponding to the output voltage of the analog circuit, thereby generating a second safety detection result related to the analog circuit. 15 . The safety detection method as claimed in claim 14 , wherein the analog circuit comprises at least one of a regulator, a charge pump, a gamma voltage generator, and a gate voltage generator.

16. The safety detection method according to claim 14, further comprising: providing at least one voltage conversion circuit, the at least one voltage conversion circuit being coupled to the at least one of the plurality of analog-to-digital converters; Using the at least one voltage conversion circuit to generate a transferred voltage according to the output voltage of the analog circuit; and The transferred voltage is converted into the second measurement digital code by using the at least one of the plurality of analog-to-digital converters.

17. The safety detection method according to claim 11, further comprising: Using the at least one of the plurality of analog-to-digital converters, during a display period of the display device, according to the output voltage output by the at least one of the plurality of source drivers, to generate the first measurement digital code; and By utilizing the at least one of the plurality of analog-to-digital converters, a touch sensing digital code is generated according to a voltage sensed on at least one touch sensing electrode of the plurality of touch sensing electrodes during a touch sensing period of the display device.

18. The safety detection method according to claim 11, further comprising: Using the at least one of the plurality of analog-to-digital converters, during a first display period in which the display device displays a first frame, to generate a third measurement digital code according to an output voltage output by a first source driver among the plurality of source drivers; and Using the at least one of the plurality of analog-to-digital converters, during a second display period in which the display device displays the first frame, to generate a fourth measurement digital code according to an output voltage output by a second source driver among the plurality of source drivers; in, The first display period and the second display period are separated by a touch sensing period of the display device.

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