Display device

Abstract

This disclosure relates to a display device. The display device includes: a display panel configured to display an image; a data driver configured to output a data voltage to a data line of the display panel; a touch driver configured to recognize touch input to the display panel; a power supply voltage generator configured to generate a touch power supply voltage; and a mixer configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal, and provide the mixed signal to the touch driver.

Description

Technical Field

[0001] Some aspects of embodiments of the present invention relate to a display device and a method for detecting the failure of a stabilizing capacitor in a touch driver using the display device. Background Technology

[0002] Typically, a display device includes a display panel and a display panel driver. The display panel includes multiple gate lines and multiple data lines. The display panel driver includes a gate driver and a data driver. The gate driver outputs gate signals to the gate lines. The data driver outputs data voltages to the data lines. The display panel may include touch functionality. The display device may also include a touch driver to operate the touch functionality (e.g., sensing or recognizing touch input from a user).

[0003] In addition, the display device may also include a power supply voltage generator that generates a power supply voltage to drive the gate driver, data driver, and touch driver, and outputs the power supply voltage to the gate driver, data driver, and touch driver.

[0004] To remove the AC component of the touch power supply voltage applied to the touch driver, the touch driver may include a stabilizing capacitor. Visual inspection alone may not be sufficient to detect failures of the stabilizing capacitor during the manufacturing and shipping processes.

[0005] When applying external noise to electrically detect the failure of the stabilizing capacitor in the touch driver, the external noise may not be applied very well because the driver board itself may also have a stabilizing capacitor.

[0006] The information disclosed in this background section is provided only to enhance the understanding of the background art, and therefore the information discussed in this background section does not necessarily constitute prior art. Summary of the Invention

[0007] Some aspects of embodiments of the present invention relate to display devices and methods for detecting failure of a stabilizing capacitor in a touch driver using the display device. For example, some aspects of embodiments of the present invention relate to display devices capable of detecting failure of a stabilizing capacitor in a touch driver using a mixed signal generated by mixing a periodic signal with a touch power supply voltage, and methods for detecting failure of a stabilizing capacitor in a touch driver using the display device.

[0008] Some aspects of embodiments of the present invention include a display device capable of detecting failure of a stabilizing capacitor in a touch driver using a mixed signal generated by mixing a periodic signal with the touch power supply voltage.

[0009] Some embodiments of the present invention also provide a method for detecting the failure of a stabilizing capacitor in a touch driver using the display device.

[0010] According to some embodiments of the present invention, a display device includes a display panel, a data driver, a touch driver, a power supply voltage generator, and a mixer. The display panel is configured to display an image. The data driver is configured to output a data voltage to data lines of the display panel. The touch driver is configured to recognize touches on the display panel. The power supply voltage generator is configured to generate a touch power supply voltage. The mixer is configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal and provide the mixed signal to the touch driver.

[0011] According to some implementations, the touch driver can be configured to receive touch power voltage in normal mode.

[0012] According to some embodiments, the display device may further include: a first switch, including a first terminal configured to receive a touch power supply voltage and a second terminal connected to an output node of a mixer; a second switch, including a first terminal configured to receive a touch power supply voltage and a second terminal connected to a first input terminal of the mixer; a third switch, including a first terminal configured to receive a periodic signal and a second terminal connected to a second input terminal of the mixer; a first pull-up resistor, including a first terminal connected to an output node of the mixer and a second terminal connected to a touch driver; and a stabilizing capacitor, including a first terminal connected to an output node of the mixer and a second terminal connected to ground.

[0013] According to some implementations, during the turn-on cycle in normal mode, the first switch signal applied to the first switch may have an active level, and the second switch signal applied to the second switch and the third switch signal applied to the third switch may have an inactive level.

[0014] According to some implementation methods, during the test cycle of the test mode, the first switch signal applied to the first switch may have an invalid level, and the second switch signal applied to the second switch and the third switch signal applied to the third switch may have an valid level.

[0015] According to some implementations, the periodic signal can be a vertical synchronization signal corresponding to the start point of a frame of the image. The vertical synchronization signal can be output from the data driver to the mixer.

[0016] According to some implementations, the data driver can be configured to output a vertical synchronization enable signal to the touch driver, indicating that the vertical synchronization signal is activated.

[0017] According to some implementations, when the input frequency of the image is a first frequency, the periodic signal can be a second vertical synchronization signal with a second frequency lower than the first frequency. The second vertical synchronization signal can be output from the data driver to the mixer.

[0018] According to some implementations, the periodic signal can be a horizontal synchronization signal corresponding to the horizontal period of the image. The horizontal synchronization signal can be output from the data driver to the mixer.

[0019] According to some embodiments, the display device may further include: a gate driver configured to apply a gate signal to a gate line of the display panel; and a drive controller configured to control the timing of the gate driver and the timing of the data driver. The periodic signal may be a vertical start signal indicating the start of a scan of the gate driver. The vertical start signal may be output from the drive controller to the mixer.

[0020] According to some embodiments, the display device may further include: a gate driver configured to apply a gate signal to a gate line of a display panel; and a drive controller configured to control the timing of the gate driver and the timing of a data driver. The data driver and the drive controller may be integrally formed to form an integrated driver. The periodic signal may be a vertical synchronization signal corresponding to the start point of a frame of an image. The vertical synchronization signal may be output from the integrated driver to a mixer.

[0021] According to some embodiments of this disclosure, a method for detecting the failure of a stabilizing capacitor of a touch driver includes: generating a touch power supply voltage; mixing a periodic signal into the touch power supply voltage to generate a mixed signal; providing the mixed signal to the touch driver in a test mode; and detecting the failure of the stabilizing capacitor of the touch driver based on the input mixed signal, which is then input to the touch driver.

[0022] According to some implementations, when the input mixed signal has a periodic signal component, the stabilizing capacitor of the touch driver can be determined to be faulty. When the input mixed signal does not have a periodic signal component, the stabilizing capacitor of the touch driver can be determined to be not faulty.

[0023] According to some implementations, the touch driver can be configured to receive touch power voltage in normal mode.

[0024] According to some embodiments, the peripheral circuitry of the touch driver may include: a first switch, including a first terminal configured to receive a touch power supply voltage and a second terminal connected to an output node of a mixer; a second switch, including a first terminal configured to receive a touch power supply voltage and a second terminal connected to a first input terminal of the mixer; a third switch, including a first terminal configured to receive a periodic signal and a second terminal connected to a second input terminal of the mixer; a first pull-up resistor, including a first terminal connected to an output node of the mixer and a second terminal connected to the touch driver; and a stabilizing capacitor, including a first terminal connected to an output node of the mixer and a second terminal connected to ground.

[0025] According to some implementations, during the turn-on cycle in normal mode, the first switch signal applied to the first switch may have an active level, and the second switch signal applied to the second switch and the third switch signal applied to the third switch may have an inactive level.

[0026] According to some implementation methods, during the test cycle of the test mode, the first switch signal applied to the first switch may have an invalid level, and the second switch signal applied to the second switch and the third switch signal applied to the third switch may have an valid level.

[0027] According to some implementations, the periodic signal can be a vertical synchronization signal corresponding to the start point of a frame of the image. The vertical synchronization signal can be output from the data driver to the mixer.

[0028] According to some implementations, the periodic signal can be a horizontal synchronization signal corresponding to the horizontal period of the image. The horizontal synchronization signal can be output from the data driver to the mixer.

[0029] According to the display device and the method for detecting the failure of the stabilizing capacitor of the touch driver using the display device, the failure of the stabilizing capacitor of the touch driver can be detected using a mixed signal generated by mixing a periodic signal with the touch power supply voltage. The failure of the stabilizing capacitor of the touch driver can be detected electrically, significantly improving detectability compared to visual or manual inspection of the stabilizing capacitor.

[0030] Furthermore, the failure of the stabilizing capacitor can be detected using a periodic signal in the display device without the need for additional noise generation devices or equipment, making it possible to detect the failure of the stabilizing capacitor of the touch driver without increasing the manufacturing cost of the display device. Attached Figure Description

[0031] The above and other features and characteristics of embodiments of the present invention will become more apparent from the accompanying drawings, which describe some aspects of the concept of the invention in more detail with reference to the drawings:

[0032] Figure 1 This is a block diagram illustrating some embodiments of a display device according to the concept of the present invention;

[0033] Figure 2 These illustrate some embodiments based on the concepts of the present invention. Figure 1 A block diagram illustrating the operation of the data driver, touch driver, power supply voltage generator, and mixer;

[0034] Figure 3 These illustrate some embodiments based on the concepts of the present invention. Figure 2 Circuit diagram of the operation of the mixer and touch driver;

[0035] Figure 4 This illustrates some embodiments of the concept according to the invention, applied in a first mode. Figure 3 Timing diagrams of the first switch signal, the second switch signal, and the third switch signal;

[0036] Figure 5 This illustrates some embodiments of the concept according to the invention being applied in a second mode. Figure 3 Timing diagrams of the first switch signal, the second switch signal, and the third switch signal;

[0037] Figure 6 These illustrate some embodiments based on the concepts of the present invention. Figure 1 A plan view of the touch driver, wherein the stabilizing capacitor of the touch driver has not failed;

[0038] Figure 7 These illustrate some embodiments based on the concepts of the present invention. Figure 1 A plan view of the touch driver, in which the stabilizing capacitor of the touch driver fails;

[0039] Figure 8 This illustrates some embodiments based on the concept of the present invention. Figure 2 Timing diagram of the mixed signal generated by the mixer;

[0040] Figure 9 This illustrates some embodiments of the present invention where the input is when the stabilizing capacitor has not failed. Figure 1 Timing diagram of the input mixed signals in the touch driver;

[0041] Figure 10 This illustrates some embodiments of the present invention regarding the input when the stabilizing capacitor fails. Figure 1 Timing diagram of the input mixed signals in the touch driver;

[0042] Figure 11This is a block diagram illustrating the operation of a data driver, touch driver, power supply voltage generator, and mixer of a display device according to some embodiments of the concept of the present invention;

[0043] Figure 12 These illustrate some embodiments based on the concepts of the present invention. Figure 11 Circuit diagram of the operation of the mixer and touch driver;

[0044] Figure 13 This is a block diagram illustrating the operation of a data driver, touch driver, power supply voltage generator, and mixer of a display device according to some embodiments of the concept of the present invention;

[0045] Figure 14 This is a block diagram illustrating the operation of a drive controller, gate driver, touch driver, power supply voltage generator, and mixer of a display device according to some embodiments of the present invention; and

[0046] Figure 15 This is a block diagram illustrating the operation of an integrated driver, touch driver, power supply voltage generator, and mixer in a display device according to some embodiments of the concept of the present invention. Detailed Implementation

[0047] In the following description, some aspects of embodiments of the concept of the invention will be explained in more detail with reference to the accompanying drawings.

[0048] Figure 1 This is a block diagram illustrating some embodiments of a display device according to the concept of the present invention.

[0049] refer to Figure 1 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a drive controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0050] For example, according to some implementations, the drive controller 200 and the data driver 500 can be integrally formed (e.g., as an integrated component). For example, the drive controller 200, the gamma reference voltage generator 400, and the data driver 500 can be integrally formed. A drive module that includes at least the integrally formed drive controller 200 and data driver 500 can be referred to as a timing controller embedded data driver (TED) or an integrated driver.

[0051] The display panel 100 has a display area AA for displaying images and a peripheral area PA adjacent to the display area AA for not displaying images.

[0052] The display panel 100 includes multiple gate lines GL, multiple data lines DL, and multiple pixels P connected to the gate lines GL and the data lines DL. The gate lines GL extend in a first direction D1, and the data lines DL extend in a second direction D2 intersecting the first direction D1.

[0053] The drive controller 200 receives input image data IMG and input control signal CONT from an external device. The input image data IMG may include red, green, and blue image data. The input image data IMG may also include white image data. The input image data IMG may also include magenta, yellow, and turquoise image data. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may also include a vertical synchronization signal and a horizontal synchronization signal.

[0054] The drive controller 200 generates a first control signal CONT1, a second control signal CONT2, a third control signal CONT3, and a data signal DATA based on the input image data IMG and the input control signal CONT.

[0055] The drive controller 200 generates a first control signal CONT1 based on the input control signal CONT for controlling the operation of the gate driver 300, and outputs the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may also include a vertical start signal and a gate clock signal.

[0056] The drive controller 200 generates a second control signal CONT2 based on the input control signal CONT for controlling the operation of the data driver 500, and outputs the second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.

[0057] The drive controller 200 generates a data signal DATA based on the input image data IMG. The drive controller 200 outputs the data signal DATA to the data driver 500.

[0058] The drive controller 200 generates a third control signal CONT3 based on the input control signal CONT for controlling the operation of the gamma reference voltage generator 400, and outputs the third control signal CONT3 to the gamma reference voltage generator 400.

[0059] The gate driver 300 generates a gate signal for driving the gate line GL in response to a first control signal CONT1 received from the drive controller 200. The gate driver 300 outputs the gate signal to the gate line GL. For example, the gate driver 300 may sequentially output gate signals to the gate line GL.

[0060] According to some implementations, the gate driver 300 may be integrated on the peripheral area PA of the display panel 100.

[0061] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to a third control signal CONT3 received from the drive controller 200. The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF has a value corresponding to the level of the data signal DATA.

[0062] According to some implementations, the gamma reference voltage generator 400 may be located in the drive controller 200 or in the data driver 500.

[0063] The data driver 500 receives a second control signal CONT2 and a data signal DATA from the drive controller 200, and receives a gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 uses the gamma reference voltage VGREF to convert the data signal DATA into a data voltage of analog type. The data driver 500 outputs this data voltage to the data line DL.

[0064] According to some embodiments, the display panel 100 may include touch functionality. The display panel 100 may include a display substrate and a touch substrate. Optionally, the display substrate and the touch substrate may be integral. The display device may also include a touch driver 600 to recognize touches on the display panel 100.

[0065] The display device may also include a power supply voltage generator 700 that generates the touch power supply voltage AVDD for the touch driver 600.

[0066] In addition to the touch power supply voltage AVDD, the power supply voltage generator 700 can generate power supply voltages for the display panel 100 and the display panel driver. For example, the power supply voltage generator 700 can output pixel power supply voltages to the pixel circuitry of the display panel 100. For example, the power supply voltage generator 700 can generate the gate on-state voltage and gate off-state voltage of the gate driver 300. For example, the power supply voltage generator 700 can generate the data power supply voltage for the data driver 500.

[0067] Figure 2 It is shown Figure 1 A block diagram illustrating the operation of the data driver 500, touch driver 600, power supply voltage generator 700, and mixer 800. Figure 3 It is shown Figure 2 Circuit diagram of the operation of mixer 800 and touch driver 600. Figure 4 It is shown that it is applied to in the first mode Figure 3The timing diagram of the first switch signal S1, the second switch signal S2, and the third switch signal S3 of the first switch SW1, the second switch SW2, and the third switch SW3. Figure 5 It is shown that it is applied to in the second mode Figure 3 The timing diagram of the first switch signal S1, the second switch signal S2, and the third switch signal S3 of the first switch SW1, the second switch SW2, and the third switch SW3.

[0068] refer to Figures 1 to 5 The display device may also include a mixer 800, which mixes the touch power supply voltage AVDD and a periodic signal (e.g., VSYNC) in a test mode (second mode) to generate a mixed signal MS and outputs the mixed signal MS to the touch driver 600.

[0069] In normal mode (first mode), the touch driver 600 can receive the touch power supply voltage AVDD.

[0070] In test mode, the failure of the stabilizing capacitor of the touch driver 600, which is connected in parallel to the touch driver 600, can be detected electrically. In normal mode, the touch driver 600 can recognize touches on the display panel 100.

[0071] like Figure 3 As shown, the peripheral circuitry of the touch driver 600 may include: a first switch SW1, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the output node of the mixer 800; a second switch SW2, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the first input terminal of the mixer 800; a third switch SW3, including a first terminal receiving a periodic signal (e.g., VSYNC) and a second terminal connected to the second input terminal of the mixer 800; a first pull-up resistor RP, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to the touch driver 600; and a stabilizing capacitor CS, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to ground.

[0072] The first pull-up resistor RP can be a load resistor for the touch driver 600 to receive the touch power supply voltage AVDD or the mixed signal MS. The stabilizing capacitor CS can remove noise components (e.g., AC components) that may be included in the touch power supply voltage AVDD applied to the touch driver 600. Although in Figure 3 The first pull-up resistor RP and the stabilizing capacitor CS are located outside the touch driver 600, but embodiments of the present invention are not limited to this. For example, the first pull-up resistor RP and the stabilizing capacitor CS may be included within the touch driver 600.

[0073] Therefore, when the stabilizing capacitor CS is not faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD with the noise component removed can be input to the touch driver 600. Conversely, when the stabilizing capacitor CS is faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD including a noise component can be input to the touch driver 600.

[0074] like Figure 4 As shown, when the touch driver 600 operates normally in normal mode, during the on-cycle TON, the first switch signal S1 applied to the first switch SW1 can have an active level, and the second switch signal S2 applied to the second switch SW2 and the third switch signal S3 applied to the third switch SW3 can have an inactive level. For example, in Figure 4 In this context, the valid level can be high, and the invalid level can be low.

[0075] During the on-cycle TON in normal mode, the touch power supply voltage AVDD can be applied to the touch driver 600 via the first pull-up resistor RP instead of via the mixer 800.

[0076] like Figure 5 As shown, when checking for failure of the stabilizing capacitor CS in test mode, during the test cycle TD, the first switch signal S1 can have an invalid level, while the second switch signal S2 and the third switch signal S3 can have an active level. For example, in Figure 5 In this context, the valid level can be high, and the invalid level can be low.

[0077] During the test cycle TD in the test mode, the touch power supply voltage AVDD can be mixed with the periodic signal VSYNC through the mixer 800, and the mixed signal MS can be applied to the touch driver 600 through the first pull-up resistor RP.

[0078] According to some implementations, the periodic signal can be a vertical synchronization signal VSYNC corresponding to the start point of an image frame. The vertical synchronization signal VSYNC can be output from the data driver 500 to the mixer 800. For example, the vertical synchronization signal VSYNC can be generated by the drive controller 200 and can be output from the drive controller 200 to the data driver 500 along with the data signal DATA. When the input frequency of the input image data IMG is 60Hz, the vertical synchronization signal VSYNC can have a frequency of 60Hz.

[0079] The data driver 500 can output a vertical synchronization enable signal VSYNC_EN to the touch driver 600, indicating that the vertical synchronization signal VSYNC is active.

[0080] Figure 6 It is shown Figure 1 A plan view of a touch driver 600, wherein the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 are not faulty. Figure 7 It is shown Figure 1 A plan view of a touch driver 600, wherein the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 fail. Figure 8 It is shown by Figure 2 The timing diagram of the mixed signal MS generated by the mixer 800. Figure 9 This indicates the input when the stabilizing capacitors (e.g., CS1 and CS2) are not faulty. Figure 1 Timing diagram of the input mixed signal TMS1 in the touch driver 600. Figure 10 This indicates the input when the stabilizing capacitors (e.g., CS1 and CS2) fail. Figure 1 Timing diagram of the input mixed signal TMS2 in the touch driver 600.

[0081] For example, refer to Figures 1 to 10 The touch driver 600 may include a touch driver chip TIC, stabilizing capacitors (e.g., CS1 and CS2) and a flexible printed circuit TFPC. The stabilizing capacitors (e.g., CS1 and CS2) are positioned adjacent to the touch driver chip TIC and remove noise components of the touch power supply voltage AVDD applied to the touch driver chip TIC. The stabilizing capacitors (e.g., CS1 and CS2) are mounted on the flexible printed circuit TFPC.

[0082] Figure 6 The case where the stabilizing capacitors (e.g., CS1 and CS2) do not fail is shown. Figure 7 The case of failure of the stabilizing capacitors (e.g., CS1 and CS2) is illustrated.

[0083] The mixed signal MS, generated by mixing the touch power supply voltage AVDD and a periodic signal (e.g., VSYNC), can have Figure 8The waveform. The mixed signal MS can be applied to the touch driver chip TIC. When the vertical sync signal VSYNC has a frequency of 60Hz, the mixed signal MS can also have a frequency of 60Hz. When the high-level voltage of the vertical sync signal VSYNC is VD and the low-level voltage of the vertical sync signal VSYNC is 0, the mixed signal MS can have a level of AVDD+VD corresponding to the high level of the vertical sync signal VSYNC and a level of AVDD corresponding to the low level of the vertical sync signal VSYNC.

[0084] like Figure 9 As shown, when the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 are not faulty, the periodic signal component of the mixed signal MS can be removed by the stabilizing capacitors (e.g., CS1 and CS2). Therefore, when the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 are not faulty, it means that the input mixed signal TMS1 of the mixed signal MS after being input to the touch driver 600 may not have a periodic signal component.

[0085] On the contrary, such as Figure 10 As shown, when the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 fail, the periodic signal component of the mixed signal MS may not be removed. Therefore, when the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 fail, it means that the input mixed signal TMS2 after being input to the mixed signal MS can have a periodic signal component.

[0086] Users or manufacturers can detect the failure of the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 based on the input mixed signals TMS1 and TMS2, which represent the mixed signal MS input to the touch driver 600. When the input mixed signal (e.g., TMS2) has a periodic signal component, it can be determined that the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 have failed. When the input mixed signal (e.g., TMS1) does not have a periodic signal component, it can be determined that the stabilizing capacitors (e.g., CS1 and CS2) of the touch driver 600 have not failed.

[0087] According to some implementations, the failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected using a mixed signal MS generated by mixing a periodic signal (e.g., VSYNC) with the touch power supply voltage AVDD. The failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected electrically, significantly improving detectability compared to visual inspection of the stabilizing capacitors (e.g., CS, or CS1 and CS2).

[0088] Furthermore, the use of a periodic signal (e.g., VSYNC) in the display device to detect the failure of the stabilizing capacitor eliminates the need for additional noise generation devices or equipment, making it possible to detect the failure of the stabilizing capacitor (e.g., CS, or CS1 and CS2) of the touch driver 600 without increasing the manufacturing cost of the display device.

[0089] Figure 11 This is a block diagram illustrating the operation of a data driver 500, a touch driver 600, a power supply voltage generator 700, and a mixer 800 of a display device according to some embodiments of the present invention. Figure 12 It is shown Figure 11 Circuit diagram of the operation of mixer 800 and touch driver 600.

[0090] like Figure 11 As shown, in addition to periodic signals, the display device according to some embodiments can be connected to the reference. Figures 1 to 10 The display device described in the previous exemplary embodiments is substantially the same. Therefore, the same reference numerals will be used to denote references to the same devices. Figures 1 to 10 The components described in the previous exemplary embodiments are the same or similar to those in the above-described embodiments, and some repeated descriptions of the above elements may be omitted.

[0091] refer to Figure 1 as well as Figures 4 to 12 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a drive controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0092] The display device may also include a touch driver 600 to recognize touches on the display panel 100. The display device may also include a power supply voltage generator 700 that generates the touch power supply voltage AVDD for the touch driver 600.

[0093] The display device may also include a mixer 800, which mixes the touch power supply voltage AVDD and a periodic signal (e.g., VSYNC2) in a test mode (second mode) to generate a mixed signal MS and outputs the mixed signal MS to the touch driver 600.

[0094] In normal mode (first mode), the touch driver 600 can receive the touch power supply voltage AVDD.

[0095] like Figure 12As shown, the peripheral circuitry of the touch driver 600 may include: a first switch SW1, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the output node of the mixer 800; a second switch SW2, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the first input terminal of the mixer 800; a third switch SW3, including a first terminal receiving a periodic signal (e.g., VSYNC2) and a second terminal connected to the second input terminal of the mixer 800; a first pull-up resistor RP, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to the touch driver 600; and a stabilizing capacitor CS, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to ground.

[0096] When the stabilizing capacitor CS is not faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD with the noise component removed can be input to the touch driver 600. Conversely, when the stabilizing capacitor CS is faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD including a noise component can be input to the touch driver 600.

[0097] According to some implementations, the periodic signal may be a second vertical synchronization signal VSYNC2 corresponding to the start point of a frame of the output image. The second vertical synchronization signal VSYNC2 may be output from the data driver 500 to the mixer 800. For example, the second vertical synchronization signal VSYNC2 may be generated by the drive controller 200 and may be output from the drive controller 200 to the data driver 500 together with the data signal DATA. The second vertical synchronization signal VSYNC2 may have a frequency lower than the input frequency of the input image data IMG. The second vertical synchronization signal VSYNC2 may be a vertical synchronization signal used in a low-power mixing mode. For example, the frequency of the second vertical synchronization signal VSYNC2 may be the output frequency of the output image, which is lower than the input frequency of the input image data IMG, to reduce battery consumption of the display device.

[0098] According to some implementations, the frequency of the second vertical synchronization signal VSYNC2 is lower than the frequency of the vertical synchronization signal VSYNC, which reduces the power consumption for detecting the failure of the stabilizing capacitor CS.

[0099] The data driver 500 can output a second vertical synchronization enable signal VSYNC2_EN to the touch driver 600, indicating that the second vertical synchronization signal VSYNC2 is activated.

[0100] According to some implementations, the failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected using a mixed signal MS generated by mixing a periodic signal (e.g., VSYNC2) with the touch power supply voltage AVDD. The failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected electrically, significantly improving detectability compared to visual inspection of the stabilizing capacitors (e.g., CS, or CS1 and CS2).

[0101] Furthermore, the failure of the stabilizing capacitor can be detected using a periodic signal (e.g., VSYNC2) in the display device without the need for additional noise generation devices or equipment, making it possible to detect the failure of the stabilizing capacitor (e.g., CS, or CS1 and CS2) of the touch driver 600 without increasing the manufacturing cost of the display device.

[0102] Figure 13 This is a block diagram illustrating the operation of a data driver 500, a touch driver 600, a power supply voltage generator 700, and a mixer 800 of a display device according to some embodiments of the present invention.

[0103] like Figure 13 As shown, in addition to periodic signals, the display device according to some embodiments can be connected to the reference. Figures 1 to 10 The display device described in the previous embodiments is substantially the same. Therefore, the same reference numerals will be used to denote the same reference numerals. Figures 1 to 10 The components described in the previous exemplary embodiments are the same or similar to those in the above-described embodiments, and some repeated descriptions of the above elements may be omitted.

[0104] refer to Figure 1 , Figures 3 to 10 as well as Figure 15 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a drive controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0105] The display device may also include a touch driver 600 to recognize touches on the display panel 100. The display device may also include a power supply voltage generator 700 that generates the touch power supply voltage AVDD for the touch driver 600.

[0106] The display device may also include a mixer 800, which mixes the touch power supply voltage AVDD and a periodic signal (e.g., HSYNC) in a test mode (second mode) to generate a mixed signal MS and outputs the mixed signal MS to the touch driver 600.

[0107] In normal mode (first mode), the touch driver 600 can receive the touch power supply voltage AVDD.

[0108] like Figure 3 As shown, the peripheral circuitry of the touch driver 600 may include: a first switch SW1, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the output node of the mixer 800; a second switch SW2, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the first input terminal of the mixer 800; a third switch SW3, including a first terminal receiving a periodic signal (e.g., HSYNC) and a second terminal connected to the second input terminal of the mixer 800; a first pull-up resistor RP, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to the touch driver 600; and a stabilizing capacitor CS, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to ground.

[0109] When the stabilizing capacitor CS is not faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD with the noise component removed can be input to the touch driver 600. Conversely, when the stabilizing capacitor CS is faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD including a noise component can be input to the touch driver 600.

[0110] According to some implementations, the periodic signal can be a horizontal sync signal HSYNC corresponding to the horizontal period of the image. The horizontal period can represent the period during which a data voltage is applied to a single horizontal line of the display panel 100. The horizontal sync signal HSYNC can be output from the data driver 500 to the mixer 800. For example, the horizontal sync signal HSYNC can be generated by the drive controller 200 and can be output from the drive controller 200 to the data driver 500 together with the data signal DATA. The horizontal sync signal HSYNC can have a frequency higher than the input frequency of the input image data IMG.

[0111] The data driver 500 can output a horizontal synchronization enable signal HSYNC_EN to the touch driver 600, indicating that the horizontal synchronization signal HSYNC is active.

[0112] According to some implementations, the failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected using a mixed signal MS generated by mixing a periodic signal (e.g., HSYNC) with the touch power supply voltage AVDD. The failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected electrically, significantly improving detectability compared to visual inspection of the stabilizing capacitors (e.g., CS, or CS1 and CS2).

[0113] Furthermore, the failure of the stabilizing capacitor is detected using a periodic signal (e.g., HSYNC) in the display device without the need for additional noise generation devices or equipment, making it possible to detect the failure of the stabilizing capacitor (e.g., CS, or CS1 and CS2) of the touch driver 600 without increasing the manufacturing cost of the display device.

[0114] Figure 14 This is a block diagram illustrating the operation of a drive controller 200, a gate driver 300, a touch driver 600, a power supply voltage generator 700, and a mixer 800 of a display device according to some embodiments of the concept of the present invention.

[0115] In addition to periodic signals, according to reference Figure 14 The display device of the described embodiments can be used with reference to Figures 1 to 10 The display device described in the previous embodiments is substantially the same. Therefore, the same reference numerals will be used to denote the same as those in the previous embodiments. Figures 1 to 10 The components described in the previous exemplary embodiments are the same or similar to those described above, and some repeated descriptions of the above elements may be omitted.

[0116] refer to Figure 1 , Figures 3 to 10 as well as Figure 14 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a drive controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0117] The display device may also include a touch driver 600 to recognize touches on the display panel 100. The display device may also include a power supply voltage generator 700 that generates the touch power supply voltage AVDD for the touch driver 600.

[0118] The display device may also include a mixer 800, which mixes the touch power supply voltage AVDD and a periodic signal (e.g., STP) in a test mode (second mode) to generate a mixed signal MS and outputs the mixed signal MS to the touch driver 600.

[0119] In normal mode (first mode), the touch driver 600 can receive the touch power supply voltage AVDD.

[0120] like Figure 3 As shown, the peripheral circuitry of the touch driver 600 may include: a first switch SW1, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the output node of the mixer 800; a second switch SW2, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to a first input terminal of the mixer 800; a third switch SW3, including a first terminal receiving a periodic signal (e.g., STP) and a second terminal connected to a second input terminal of the mixer 800; a first pull-up resistor RP, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to the touch driver 600; and a stabilizing capacitor CS, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to ground.

[0121] When the stabilizing capacitor CS is not faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD with the noise component removed can be input to the touch driver 600. Conversely, when the stabilizing capacitor CS is faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD including a noise component can be input to the touch driver 600.

[0122] According to some embodiments, the periodic signal may be a vertical start signal STP indicating the start of a scan of the gate driver 300. The vertical start signal STP may indicate the start of a frame. For example, the frequency of the vertical start signal STP may be the same as the input frequency of the input image data IMG. The gate driver 300 may include stages that output gate signals to corresponding gate lines. The stages may use a carry signal to output gate signals to the gate lines in the form of a shift register. In this embodiment, the first stage cannot receive a carry signal from the previous stage, so that the first stage can receive the vertical start signal STP.

[0123] According to some implementations, the vertical start signal STP can be output from the drive controller 200 to the mixer 800. Alternatively, the vertical start signal STP can be output from the gate driver 300 to the mixer 800.

[0124] According to some implementations, the failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected using a mixed signal MS generated by mixing a periodic signal (e.g., STP) with the touch power supply voltage AVDD. The failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected electrically, significantly improving detectability compared to visual inspection of the stabilizing capacitors (e.g., CS, or CS1 and CS2).

[0125] Furthermore, the failure of the stabilizing capacitor is detected using a periodic signal (e.g., STP) in the display device without the need for additional noise generation devices or equipment, making it possible to detect the failure of the stabilizing capacitor (e.g., CS, or CS1 and CS2) of the touch driver 600 without increasing the manufacturing cost of the display device.

[0126] Figure 15 This is a block diagram illustrating the operation of an integrated driver 500A, a touch driver 600, a power supply voltage generator 700, and a mixer 800 in a display device according to some embodiments of the present invention.

[0127] In addition to the data drive 500 being configured as an integrated drive 500A, according to the reference Figure 15 The display device of the described embodiments can be used with reference to Figures 1 to 10 The display device described in the previous embodiment is substantially the same. Therefore, the same reference numerals will be used to denote the same as those described above. Figures 1 to 10 The components described in the previous exemplary embodiments are the same or similar to those described above, and some repeated descriptions of the above elements may be omitted.

[0128] refer to Figure 1 , Figures 3 to 10 as well as Figure 15 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a drive controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500. According to some embodiments of the present invention, the drive controller 200 and the data driver 500 can be integrally formed, such that the drive controller 200 and the data driver 500 can form an integrated driver 500A.

[0129] The display device may also include a touch driver 600 to recognize touches on the display panel 100. The display device may also include a power supply voltage generator 700 that generates the touch power supply voltage AVDD for the touch driver 600.

[0130] The display device may also include a mixer 800, which mixes the touch power supply voltage AVDD and a periodic signal (e.g., VSYNC) in a test mode (second mode) to generate a mixed signal MS and outputs the mixed signal MS to the touch driver 600.

[0131] In normal mode (first mode), the touch driver 600 can receive the touch power supply voltage AVDD.

[0132] like Figure 3 As shown, the peripheral circuitry of the touch driver 600 may include: a first switch SW1, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the output node of the mixer 800; a second switch SW2, including a first terminal receiving the touch power supply voltage AVDD and a second terminal connected to the first input terminal of the mixer 800; a third switch SW3, including a first terminal receiving a periodic signal (e.g., VSYNC) and a second terminal connected to the second input terminal of the mixer 800; a first pull-up resistor RP, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to the touch driver 600; and a stabilizing capacitor CS, including a first terminal connected to the output node of the mixer 800 and a second terminal connected to ground.

[0133] When the stabilizing capacitor CS is not faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD with the noise component removed can be input to the touch driver 600. Conversely, when the stabilizing capacitor CS is faulty and a touch power supply voltage AVDD including a noise component is applied to the touch driver 600, a touch power supply voltage AVDD including a noise component can be input to the touch driver 600.

[0134] According to some embodiments, the periodic signal can be a vertical sync signal VSYNC corresponding to the start point of an image frame. The vertical sync signal VSYNC can be output from the integrated driver 500A to the mixer 800. The integrated driver 500A can synchronize the vertical sync signal VSYNC and the data signal DATA. When the input frequency of the input image data IMG is 60Hz, the vertical sync signal VSYNC can have a frequency of 60Hz. According to some embodiments, the integrated driver 500A can output a vertical sync enable signal VSYNC_EN to the touch driver 600, indicating the activation of the vertical sync signal VSYNC.

[0135] According to some implementations, the failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected using a mixed signal MS generated by mixing a periodic signal (e.g., VSYNC) with the touch power supply voltage AVDD. The failure of the stabilizing capacitors (e.g., CS, or CS1 and CS2) of the touch driver 600 can be detected electrically, significantly improving detectability compared to visual inspection of the stabilizing capacitors (e.g., CS, or CS1 and CS2).

[0136] Furthermore, the failure of the stabilizing capacitor is detected using a periodic signal (e.g., VSYNC) in the display device without the need for additional noise generation devices or equipment, making it possible to detect the failure of the stabilizing capacitor (e.g., CS, or CS1 and CS2) of the touch driver 600 without increasing the manufacturing cost of the display device.

[0137] The display device according to the present invention and the method for detecting the failure of the stabilizing capacitor of the touch driver using the display device can detect the failure of the stabilizing capacitor of the touch driver using a mixed signal generated by mixing a periodic signal with the touch power supply voltage, thereby improving detectability and without increasing manufacturing costs.

[0138] The foregoing is an explanation of the inventive concept and should not be construed as limiting it. Although some aspects of embodiments of the inventive concept have been described, those skilled in the art will readily understand that many modifications can be made to the embodiments without substantially departing from the novel teachings and features of embodiments according to the inventive concept. Therefore, all such modifications are intended to be included within the scope of the inventive concept as defined in the claims. In the claims, the term "means plus function" is intended to cover the structure described herein that performs the functions, and not only structural equivalents but also equivalent structures. Therefore, it should be understood that the foregoing is an explanation of the inventive concept and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The inventive concept is defined by the appended claims, and the equivalents of the claims are included in the inventive concept.

Claims

1. A display device, comprising: Display panel, configured to display images; A data driver configured to output a data voltage to the data lines of the display panel; A touch driver configured to recognize touch input to the display panel; A power supply voltage generator, configured to generate a touch power supply voltage; as well as A mixer is configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal, and to provide the mixed signal to the touch driver. Wherein, the periodic signal is a vertical synchronization signal corresponding to the start point of the frame of the image, and The data driver is configured to output the vertical synchronization signal to the mixer.

2. The display device according to claim 1, wherein The touch driver is configured to receive the touch power voltage in normal mode.

3. The display device according to claim 2, further comprising: The first switch includes a first terminal configured to receive the touch power voltage and a second terminal connected to the output node of the mixer; The second switch includes a first terminal configured to receive the touch power voltage and a second terminal connected to a first input terminal of the mixer; The third switch includes a first terminal configured to receive the periodic signal and a second terminal connected to the second input terminal of the mixer; The first pull-up resistor includes a first terminal connected to the output node of the mixer and a second terminal connected to the touch driver; as well as A stabilizing capacitor includes a first terminal connected to the output node of the mixer and a second terminal connected to ground.

4. The display device according to claim 3, wherein During the on-cycle of the normal mode, the first switch signal applied to the first switch has an active level, and the second switch signal applied to the second switch and the third switch signal applied to the third switch have inactive levels.

5. The display device according to claim 3, wherein During the test cycle of the test mode, the first switch signal applied to the first switch has an invalid level, while the second switch signal applied to the second switch and the third switch signal applied to the third switch have valid levels.

6. The display device according to claim 1, wherein The data driver is configured to output a vertical synchronization enable signal to the touch driver, indicating that the vertical synchronization signal is activated.

7. A display device, comprising: Display panel, configured to display images; A data driver configured to output a data voltage to the data lines of the display panel; A touch driver configured to recognize touch input to the display panel; A power supply voltage generator, configured to generate a touch power supply voltage; as well as A mixer is configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal, and to provide the mixed signal to the touch driver. Wherein, the input frequency in response to the image is a first frequency, and the periodic signal is a second vertical synchronization signal having a second frequency lower than the first frequency, and The data driver is configured to output the second vertical synchronization signal to the mixer.

8. A display device, comprising: Display panel, configured to display images; A data driver configured to output a data voltage to the data lines of the display panel; A touch driver configured to recognize touch input to the display panel; A power supply voltage generator, configured to generate a touch power supply voltage; as well as A mixer is configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal, and to provide the mixed signal to the touch driver. Wherein, the periodic signal is a horizontal synchronization signal corresponding to the horizontal period of the image, and The data driver is configured to output the horizontal synchronization signal to the mixer.

9. A display device, comprising: Display panel, configured to display images; A data driver configured to output a data voltage to the data lines of the display panel; A touch driver configured to recognize touch input to the display panel; A power supply voltage generator, configured to generate a touch power supply voltage; A mixer configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal, and to provide the mixed signal to the touch driver; A gate driver configured to apply a gate signal to the gate line of the display panel; as well as A drive controller configured to control the timing of the gate driver and the timing of the data driver. Wherein, the periodic signal is a vertical start signal indicating the start of a scan of the gate driver, and The drive controller is configured to output the vertical start signal to the mixer.

10. A display device, comprising: Display panel, configured to display images; A data driver configured to output a data voltage to the data lines of the display panel; A touch driver configured to recognize touch input to the display panel; A power supply voltage generator, configured to generate a touch power supply voltage; A mixer configured to mix a periodic signal with the touch power supply voltage in a test mode to generate a mixed signal, and to provide the mixed signal to the touch driver; A gate driver configured to apply a gate signal to the gate line of the display panel; as well as A drive controller configured to control the timing of the gate driver and the timing of the data driver. The data driver and the drive controller are integrally formed to create an integrated driver. Wherein, the periodic signal is a vertical synchronization signal corresponding to the start point of the frame of the image, and The integrated driver is configured to output the vertical synchronization signal to the mixer.

Images