Display device and electronic device including the same

Abstract

The present application relates to a display device and an electronic device including the same. A display device includes a display panel that displays an image, a touch panel that senses a touch, a display panel driving section that drives the display panel in a variable frequency mode and generates a touch vertical synchronization signal by modulating a vertical synchronization signal, and a touch panel driving section that judges a driving timing of the touch panel based on the touch vertical synchronization signal and drives the touch panel in the variable frequency mode by matching the driving timing of the touch panel with a driving timing of the display panel.

Description

Technical Field

[0001] This invention relates to a display device and an electronic device including the display device. More specifically, this invention relates to a display device that synchronizes the driving timing of a touch panel with the driving timing of a display panel, and an electronic device including the display device. Background Technology

[0002] The display device may include a display module and a touch module. The display module may include a display panel for displaying images and a display panel driver for driving the display panel, and the touch module may include a touch panel for sensing user touches and a touch panel driver for driving the touch panel.

[0003] The display module can be driven in a variable frequency mode to display images at a variable frequency. The display panel driver can provide the touch panel driver with a signal for the driving timing of the display panel, and the touch panel driver can drive in the variable frequency mode by synchronizing the driving timing of the touch panel with the driving timing of the display panel based on the signal for the driving timing of the display panel.

[0004] Furthermore, when the driving timing of the touch panel is inconsistent with the driving timing of the display panel, a delay may occur in the display panel's image responding to the user's touch. For example, when a user surfing the internet scrolls down using the touch panel, the image on the display panel may scroll down with a delay. Summary of the Invention

[0005] One object of the present invention is to provide a display device that synchronizes the driving timing of a touch panel with the driving timing of a display panel.

[0006] Another object of the present invention is to provide an electronic device including the aforementioned display device.

[0007] A display device according to an embodiment of the present invention for achieving the above-described object of the present invention includes: a display panel for displaying an image; a touch panel for sensing touch; a display panel driving unit for driving the display panel in a variable frequency mode and generating a touch vertical synchronization signal by modulating a vertical synchronization signal; and a touch panel driving unit for determining the driving timing of the touch panel based on the touch vertical synchronization signal and driving the touch panel in the variable frequency mode by aligning the driving timing of the touch panel with the driving timing of the display panel.

[0008] In one embodiment, when the driving frequency of the display panel changes from a first driving frequency to a second driving frequency different from the first driving frequency, the display panel driving unit can modulate the initial pulse of the vertical synchronization signal in at least one frame having the second driving frequency.

[0009] In one embodiment, in the at least one frame having the second driving frequency, the display panel driving unit may maintain the remaining pulses of the vertical synchronization signal.

[0010] In one embodiment, the display panel driving unit can modulate the voltage of the initial pulse of the vertical synchronization signal.

[0011] In one embodiment, when the second drive frequency is different, the voltage of the initial pulse of the touch vertical synchronization signal may be different in the at least one frame having the second drive frequency.

[0012] In one embodiment, the display panel driving unit can modulate the voltage and number of the initial pulses of the vertical synchronization signal.

[0013] In one embodiment, when the second driving frequency is different, the voltage and number of the initial pulses of the touch vertical synchronization signal may be different in the at least one frame having the second driving frequency.

[0014] In one embodiment, the frame interval of the display panel may include a valid interval and a blank interval.

[0015] In one embodiment, the initial pulse of the vertical synchronization signal may be included within the effective interval.

[0016] In one embodiment, the frame interval of the display panel may include a front shoulder interval, an effective interval, and a rear shoulder interval.

[0017] In one embodiment, the initial pulse of the vertical synchronization signal may be included in the rear shoulder region.

[0018] An electronic device according to an embodiment for achieving another object of the present invention described above includes: a host processor that outputs a vertical synchronization signal; a display panel that displays an image; a touch panel that senses touch; a display panel driving unit that drives the display panel in a variable frequency mode and generates a touch vertical synchronization signal by modulating the vertical synchronization signal; and a touch panel driving unit that determines the driving timing of the touch panel based on the touch vertical synchronization signal and drives the touch panel in the variable frequency mode by aligning the driving timing of the touch panel with the driving timing of the display panel.

[0019] In one embodiment, when the driving frequency of the display panel changes from a first driving frequency to a second driving frequency different from the first driving frequency, the display panel driving unit can modulate the initial pulse of the vertical synchronization signal in at least one frame having the second driving frequency.

[0020] In one embodiment, in the at least one frame having the second driving frequency, the display panel driving unit may maintain the remaining pulses of the vertical synchronization signal.

[0021] In one embodiment, the display panel driving unit can modulate the voltage of the initial pulse of the vertical synchronization signal.

[0022] In one embodiment, when the second drive frequency is different, the voltage of the initial pulse of the touch vertical synchronization signal may be different in the at least one frame having the second drive frequency.

[0023] In one embodiment, the display panel driving unit can modulate the voltage and number of the initial pulses of the vertical synchronization signal.

[0024] In one embodiment, when the second driving frequency is different, the voltage and number of the initial pulses of the touch vertical synchronization signal may be different in the at least one frame having the second driving frequency.

[0025] In one embodiment, the frame interval of the display panel may include a valid interval and a blank interval.

[0026] In one embodiment, the initial pulse of the vertical synchronization signal may be included within the effective interval.

[0027] According to the display device and electronic device including the display device as described above, the touch vertical synchronization signal can be generated by modulating the vertical synchronization signal. Therefore, the driving timing of the touch panel can be consistent with the driving timing of the display panel. Furthermore, in order to make the driving timing of the touch panel consistent with the driving timing of the display panel, only the touch vertical synchronization signal line for transmitting the touch vertical synchronization signal is needed, thus reducing the number of pins required by the touch panel driving section. Attached Figure Description

[0028] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present invention.

[0029] Figure 2 This is a conceptual diagram illustrating the variable frequency mode.

[0030] Figure 3 This is a diagram showing the touch vertical synchronization signal according to a comparative example.

[0031] Figure 4 This is a diagram illustrating a touch vertical synchronization signal according to an embodiment of the present invention.

[0032] Figures 5 to 9 It is shown Figure 3 The diagram shows a specific example of the vertical synchronization signal and a touch vertical synchronization signal.

[0033] Figure 10 This is a block diagram illustrating an electronic device according to an embodiment of the present invention.

[0034] Figure 11 It is shown Figure 10 The diagram shows an example of an electronic device implemented as a smartphone.

[0035] Explanation of reference numerals in the attached figures 10: Display device 100: Display panel driver unit 120: Drive Control Unit 130: Gate driving section 150: Data-Driven Department 160: Launch drive unit 200: Display panel 300: Touch panel driver unit 400: Touch panel Detailed Implementation

[0036] The invention will now be described in more detail with reference to the accompanying drawings.

[0037] Figure 1 This is a block diagram illustrating a display device 10 according to an embodiment of the present invention.

[0038] Reference Figure 1 The display device 10 may include a display module for displaying images and a touch module for sensing user touch. The display module may include a display panel driver unit 100 and a display panel 200, and the touch module may include a touch panel driver unit 300 and a touch panel 400.

[0039] The display panel driving unit 100 can drive the display panel 200 to display images. The display panel driving unit 100 may include a driving control unit 120, a gate driving unit 130, a data driving unit 150, and a transmission driving unit 160.

[0040] The display panel 200 may include a display section for displaying images and a surrounding section arranged adjacent to the display section.

[0041] The display panel 200 may include gate lines, data lines, emission lines, and pixels electrically connected to each of the gate lines, data lines, and emission lines.

[0042] The drive control unit 120 can receive input image data IMG and input control signal CONT from an external host processor (not shown). For example, the input image data IMG may include red image data, green image data, and blue image data. The input image data IMG may also include white image data. The input image data IMG may also include magenta image data, yellow image data, and cyan 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 VSYNC and a horizontal synchronization signal HSYNC.

[0043] The drive control unit 120 can generate 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.

[0044] The drive control unit 120 can generate a first control signal CONT1 for controlling the operation of the gate drive unit 130 based on the input control signal CONT, and provide it to the gate drive unit 130. The first control signal CONT1 may include the vertical synchronization signal VSYNC and the gate clock signal.

[0045] The drive control unit 120 can generate a second control signal CONT2 for controlling the operation of the data drive unit 150 based on the input control signal CONT, and provide it to the data drive unit 150. The second control signal CONT2 may include the horizontal synchronization signal HSYNC and the load signal.

[0046] The drive control unit 120 can generate a data signal DATA based on the input image data IMG. The drive control unit 120 can provide the data signal DATA to the data drive unit 150.

[0047] The drive control unit 120 can generate the third control signal CONT3 for controlling the operation of the transmission drive unit 160 based on the input control signal CONT, and provide it to the transmission drive unit 160.

[0048] The gate driving unit 130 can generate a gate signal GS for driving the gate line based on the first control signal CONT1 received from the driving control unit 120. The gate driving unit 130 can provide the gate signal GS to the gate line.

[0049] The data driving unit 150 can receive the second control signal CONT2 and the data signal DATA from the drive control unit 120. The data driving unit 150 can convert the data signal DATA into an analog data voltage VDATA. The data driving unit 150 can provide the data voltage VDATA to the data line.

[0050] The transmit drive unit 160 can generate a transmit signal EM for driving the transmit line based on the third control signal CONT3 received from the drive control unit 120. The transmit drive unit 160 can provide the transmit signal EM to the transmit line.

[0051] exist Figure 1 For ease of explanation, the diagram shows a configuration where the gate driving portion 130 is arranged on a first side of the display panel 200 and the emission driving portion 160 is arranged on a second side of the display panel 200; however, the invention is not limited thereto. For example, both the gate driving portion 130 and the emission driving portion 160 may be arranged on the first side of the display panel 200. Alternatively, both the gate driving portion 130 and the emission driving portion 160 may be arranged on both sides of the display panel 200. Furthermore, the gate driving portion 130 and the emission driving portion 160 may be integrally formed.

[0052] The touch panel driver unit 300 can drive the touch panel 400 to sense the user's touch. The touch panel driver unit 300 can generate touch drive signals and provide them to the touch panel 400, and can receive touch sensing signals from the touch panel 400. The touch panel driver unit 300 can sense the user's touch based on the touch sensing signals. The touch panel driver unit 300 can generate touch data (not shown) representing the sensed touch, and can provide the touch data to the display panel driver unit 100 or the external host processor.

[0053] The display module can be driven in a variable frequency mode that displays the image at a variable frequency. The drive control unit 120 can determine whether the drive frequency (or display drive frequency) of the display panel 200 has changed based on the vertical sync signal VSYNC. Specifically, the vertical sync signal VSYNC can have pulses per frame. Therefore, the drive control unit 120 can calculate the display drive frequency based on the length between consecutive vertical sync signals VSYNC in consecutive frames. In this case, the drive control unit 120 needs to calculate the length between consecutive vertical sync signals VSYNC, so the drive control unit 120 can generate the data signal DATA by delaying the input image data IMG by one frame. However, the present invention is not limited to this. For example, the drive control unit 120 can receive a variable frequency mode signal from the external host processor, thereby determining whether the display drive frequency has changed. Here, the variable frequency mode signal can be a signal representing the frequency of the input image data IMG.

[0054] The drive control unit 120 can generate a touch vertical synchronization signal TVSYNC by modulating the vertical synchronization signal VSYNC. The drive control unit 120 can provide the touch vertical synchronization signal TVSYNC to the touch vertical synchronization signal line TVSYNCL connected to the touch panel drive unit 300.

[0055] The touch panel driver unit 300 can determine the driving frequency (or touch driving frequency) of the touch panel 400 based on the touch vertical synchronization signal TVSYNC. It can drive the touch panel 400 in the variable frequency mode by making the driving timing of the touch panel 400 consistent with the driving timing of the display panel 200.

[0056] Figure 2 This is a conceptual diagram illustrating the variable frequency mode.

[0057] Reference Figure 1 and Figure 2 The display module can be driven in the variable frequency mode. The display driving frequency can vary according to the length of the frame interval. For example, when the length of the frame interval is long, the display driving frequency can be low. Conversely, when the length of the frame interval is short, the display driving frequency can be high.

[0058] A first frame interval FR1 having a first frequency may include a first valid interval AC1 and a first blank interval BL1. A second frame interval FR2 having a second frequency different from the first frequency may include a second valid interval AC2 and a second blank interval BL2. A third frame interval FR3 having a third frequency different from both the first and second frequencies may include a third valid interval AC3 and a third blank interval BL3.

[0059] The first valid interval AC1 may have the same length as the second valid interval AC2, and the first blank interval BL1 may have a different length than the second blank interval BL2.

[0060] The second valid interval AC2 may have the same length as the third valid interval AC3, and the second blank interval BL2 may have a different length than the third blank interval BL3.

[0061] The frame interval for the display module driven in the variable frequency mode may include a data writing interval that writes the data voltage VDATA to the pixel and a self-scanning interval that does not write the data voltage VDATA to the pixel and only performs light emission. The data writing interval may be arranged within the effective intervals AC1, AC2, and AC3. The self-scanning interval may be arranged within the blank intervals BL1, BL2, and BL3.

[0062] Figure 3 This is a diagram showing the touch vertical synchronization signal TVSYNC according to a comparative example.

[0063] Reference Figures 1 to 3 The touch vertical synchronization signal TVSYNC in the comparison example can be the same as the vertical synchronization signal VSYNC. The touch panel driver unit 300 can determine the driving timing of the touch panel 400 based on the touch vertical synchronization signal TVSYNC.

[0064] The touch panel driver unit 300 can determine whether the touch driving frequency has changed based on the touch vertical synchronization signal TVSYNC. Specifically, the touch vertical synchronization signal TVSYNC can have pulses per frame. Therefore, the touch panel driver unit 300 can calculate the touch driving frequency based on the length between consecutive touch vertical synchronization signals TVSYNC in consecutive frames. In this case, since the touch panel driver unit 300 needs to calculate the length between consecutive touch vertical synchronization signals TVSYNC, it can generate the touch driving signal by delaying it by one frame. Therefore, the touch driving frequency can be delayed by one frame compared to the display driving frequency.

[0065] For example, each of the first frame interval FR1 to the fourth frame interval FR4 can have a display drive frequency of 120Hz. Each of the first frame interval FR1 to the fourth frame interval FR4 can have the pulse of the vertical synchronization signal VSYNC. Figure 3 In this context, the 120Hz display drive frequency is shown as "A". Conversely, each of the first frame interval FR1 to the fourth frame interval FR4 can have a 120Hz touch drive frequency. Each of the first frame interval FR1 to the fourth frame interval FR4 can have the pulse of the touch vertical synchronization signal TVSYNC. Figure 3 In the text, the 120Hz touch drive frequency is shown as "A".

[0066] For example, the fifth frame interval FR5 can have a display drive frequency of 30Hz. Therefore, the length of the fifth frame interval FR5 can be four times the length of each of the first frame intervals FR1 to the fourth frame interval FR4. The fifth frame interval FR5 can include the pulses of the vertical sync signal VSYNC. Figure 3 In this context, the 30Hz display drive frequency is shown as "B". Conversely, since the touch drive frequency is delayed by one frame compared to the display drive frequency, the fifth frame interval FR5 can have the 120Hz touch drive frequency. The fifth frame interval FR5 can contain the pulses of the touch vertical synchronization signal TVSYNC. Figure 3 In this context, the 120Hz touch drive frequency is shown as "A". Therefore, in the fifth frame interval FR5, the drive timing of the touch panel 400 may be inconsistent with the drive timing of the display panel 200.

[0067] For example, the sixth frame interval FR6 and the seventh frame interval FR7 can have a display drive frequency of 60Hz. Therefore, the length of each of the sixth frame interval FR6 and the seventh frame interval FR7 can be twice the length of each of the first frame intervals FR1 to the fourth frame interval FR4. Each of the sixth frame interval FR6 and the seventh frame interval FR7 can have the pulse of the vertical synchronization signal VSYNC. Figure 3 In this context, the 60Hz display drive frequency is shown as "C". Conversely, since the touch drive frequency is delayed by one frame compared to the display drive frequency, the sixth frame interval FR6 can have a 30Hz touch drive frequency, and the seventh frame interval FR7 can have a 60Hz touch drive frequency. Each of the sixth frame interval FR6 and the seventh frame interval FR7 can have the pulse of the touch vertical synchronization signal TVSYNC. Figure 3 In the diagram, the 30Hz touch drive frequency is shown as "B", and the 60Hz touch drive frequency is shown as "C". Therefore, in the sixth frame interval FR6, the drive timing of the touch panel 400 may be inconsistent with the drive timing of the display panel 200.

[0068] For example, the eighth frame interval FR8, the ninth frame interval FR9, the tenth frame interval FR10, and the eleventh frame interval FR11 can have the aforementioned 120Hz display drive frequency. Therefore, the length of each of the eighth frame interval FR8 to the eleventh frame interval FR11 can be the same as the length of each of the first frame interval FR1 to the fourth frame interval FR4. Each of the eighth frame interval FR8 to the eleventh frame interval FR11 can have the pulse of the vertical synchronization signal VSYNC. Figure 3 In this context, the 120Hz display drive frequency is shown as "A". Conversely, since the touch drive frequency is delayed by one frame compared to the display drive frequency, the eighth frame interval FR8 can have the 60Hz touch drive frequency, and the ninth frame interval FR9 to the eleventh frame interval FR11 can have the 120Hz touch drive frequency. Each of the eighth frame interval FR8 to the eleventh frame interval FR11 can have the pulse of the touch vertical synchronization signal TVSYNC. Figure 3 In the diagram, the 60Hz touch driving frequency is shown as "C", and the 120Hz touch driving frequency is shown as "A". Therefore, in the eighth frame interval FR8, the driving timing of the touch panel 400 may be inconsistent with the driving timing of the display panel 200.

[0069] In summary, in the fifth frame interval FR5, the sixth frame interval FR6, and the eighth frame interval FR8, the driving timing of the touch panel 400 may be inconsistent with the driving timing of the display panel 200, which may result in a delay in the response of the image of the display panel 200 to the touch delay of the touch panel 400.

[0070] Figure 4 This is a diagram illustrating a touch vertical synchronization signal TVSYNC according to an embodiment of the present invention.

[0071] Reference Figures 1 to 4According to an embodiment of the present invention, the touch vertical synchronization signal TVSYNC can be generated by modulating the vertical synchronization signal VSYNC. Specifically, when the display driving frequency changes from a first driving frequency to a second driving frequency different from the first driving frequency, the touch vertical synchronization signal TVSYNC can be generated by modulating the initial pulse of the vertical synchronization signal VSYNC in at least one frame having the second driving frequency. Therefore, the driving timing of the touch panel 400 can be consistent with the driving timing of the display panel 200. Furthermore, in order to make the driving timing of the touch panel 400 consistent with the driving timing of the display panel 200, only the touch vertical synchronization signal line TVSYNCL is required, thus reducing the number of pins required by the touch panel driving section 300. Moreover, in the at least one frame having the second driving frequency, the touch vertical synchronization signal TVSYNC, which retains the remaining pulse of the vertical synchronization signal VSYNC, can be generated. Therefore, other driving operations of the touch panel 400 can remain unaffected.

[0072] For example, each of the first frame interval FR1 to the fourth frame interval FR4 can have the aforementioned 120Hz display drive frequency. Figure 4 In the diagram, the 120Hz display driving frequency is shown as "A". The display driving frequency can be changed within the first frame interval FR1. The initial pulse of the vertical synchronization signal VSYNC in the first frame interval FR1 to the fourth frame interval FR4 can be generated in the first frame interval FR1. Therefore, the pulse of the vertical synchronization signal VSYNC in the first frame interval FR1 can be modulated to generate a touch vertical synchronization signal TVSYNC. Even if the touch panel driving unit 300 does not calculate the touch driving frequency based on the length between consecutive touch vertical synchronization signals TVSYNC in consecutive frames, the touch panel driving unit 300 can generate the touch driving signal without delay based on the touch vertical synchronization signal TVSYNC in the first frame interval FR1. The first frame interval FR1 to the fourth frame interval FR4 can have the 120Hz touch driving frequency. Figure 4 In this context, the 120Hz touch driving frequency is indicated as "A". Therefore, within the first frame interval FR1 to the fourth frame interval FR4, the driving timing of the touch panel 400 can be consistent with the driving timing of the display panel 200.

[0073] For example, the fifth frame interval FR5 can have the 30Hz display drive frequency. Figure 4In the diagram, the 30Hz display driving frequency is shown as "B". The display driving frequency can be changed within the fifth frame interval FR5. The initial pulse of the vertical sync signal VSYNC in the fifth frame interval FR5 can be generated within FR5. Therefore, the pulse of the vertical sync signal VSYNC in the fifth frame interval FR5 can be modulated to generate the touch vertical sync signal TVSYNC. Even if the touch panel driving unit 300 does not calculate the touch driving frequency based on the length between consecutive touch vertical sync signals TVSYNC in the consecutive frames, the touch panel driving unit 300 can generate the touch driving signal without the delay based on the touch vertical sync signal TVSYNC in the fifth frame interval FR5. The fifth frame interval FR5 can have the 30Hz touch driving frequency. Figure 4 In this context, the 30Hz touch drive frequency is indicated as "B". Therefore, in the fifth frame interval FR5, the drive timing of the touch panel 400 can be consistent with the drive timing of the display panel 200.

[0074] For example, each of the sixth frame interval FR6 and the seventh frame interval FR7 can have the 60Hz display drive frequency. Figure 4 In the diagram, the 60Hz display driving frequency is shown as "C". The display driving frequency can be changed within the sixth frame interval FR6. The initial pulse of the vertical synchronization signal VSYNC in the sixth frame interval FR6 and the seventh frame interval FR7 can be generated in the sixth frame interval FR6. Therefore, the pulse of the vertical synchronization signal VSYNC in the sixth frame interval FR6 can be modulated to generate the touch vertical synchronization signal TVSYNC. Even if the touch panel driving unit 300 does not calculate the touch driving frequency based on the length between consecutive touch vertical synchronization signals TVSYNC in the consecutive frames, the touch panel driving unit 300 can generate the touch driving signal without delay based on the touch vertical synchronization signal TVSYNC in the sixth frame interval FR6. The sixth frame interval FR6 and the seventh frame interval FR7 can have the 60Hz touch driving frequency. Figure 4 In the diagram, the 60Hz touch drive frequency is shown as "C". Therefore, in the sixth frame interval FR6 and the seventh frame interval FR7, the drive timing of the touch panel 400 can be consistent with the drive timing of the display panel 200.

[0075] For example, each of the eighth frame interval FR8 to the eleventh frame interval FR11 can have the 120Hz display drive frequency. Figure 4 In the diagram, the 120Hz display driving frequency is shown as "A". The display driving frequency can be changed within the eighth frame interval FR8. The initial pulse of the vertical sync signal VSYNC in the eighth frame interval FR8 to the eleventh frame interval FR11 can be generated in the eighth frame interval FR8. Therefore, the pulse of the vertical sync signal VSYNC in the eighth frame interval FR8 can be modulated to generate a touch vertical sync signal TVSYNC. Even if the touch panel driving unit 300 does not calculate the touch driving frequency based on the length between consecutive touch vertical sync signals TVSYNC in the consecutive frames, the touch panel driving unit 300 can generate the touch driving signal without delay based on the touch vertical sync signal TVSYNC in the eighth frame interval FR8. The eighth frame interval FR8 to the eleventh frame interval FR11 can have the 120Hz touch driving frequency. Figure 4 In this context, the 120Hz touch driving frequency is indicated as "A". Therefore, in the eighth frame interval FR8 to the eleventh frame interval FR11, the driving timing of the touch panel 400 can be consistent with the driving timing of the display panel 200.

[0076] Figures 5 to 9 It is shown Figure 3 The figure shows specific examples of the vertical sync signal VSYNC and the touch vertical sync signal TVSYNC.

[0077] Reference Figures 1 to 5 According to an embodiment of the present invention, the touch vertical synchronization signal TVSYNC can be generated by modulating the vertical synchronization signal VSYNC. Specifically, when the display driving frequency changes from a first driving frequency to a second driving frequency different from the first driving frequency, the touch vertical synchronization signal TVSYNC can be generated by modulating the initial pulse of the vertical synchronization signal VSYNC in at least one frame having the second driving frequency. Therefore, the driving timing of the touch panel 400 can be consistent with the driving timing of the display panel 200. Furthermore, in order to make the driving timing of the touch panel 400 consistent with the driving timing of the display panel 200, only the touch vertical synchronization signal line TVSYNCL is required, thus reducing the number of pins required by the touch panel driving section 300. Moreover, in the at least one frame having the second driving frequency, the touch vertical synchronization signal TVSYNC, which retains the remaining pulse of the vertical synchronization signal VSYNC, can be generated. Therefore, other driving operations of the touch panel 400 can remain unaffected. However, this has already been explained above, so a repeating explanation is omitted.

[0078] In at least one frame having the second drive frequency, the drive control unit 120 can modulate the voltage of the initial pulse of the vertical synchronization signal VSYNC. Specifically, when the second drive frequency is different, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be different in at least one frame having the second drive frequency.

[0079] For example, when the second driving frequency is 120Hz, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be -1.8V. For example, when the second driving frequency is 30Hz, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be -0.9V. For example, when the second driving frequency is 60Hz, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be -1.2V.

[0080] As described above, in the at least one frame having the second driving frequency, when the initial pulse of the vertical synchronization signal VSYNC is modulated to generate the touch vertical synchronization signal TVSYNC, the touch panel driving unit 300 can determine whether the touch driving frequency has changed based on the touch vertical synchronization signal TVSYNC. Furthermore, the touch panel driving unit 300 can determine the touch driving frequency based on the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC.

[0081] Reference Figures 1 to 4 and Figure 6According to an embodiment of the present invention, the touch vertical synchronization signal TVSYNC can be generated by modulating the vertical synchronization signal VSYNC. Specifically, when the display driving frequency changes from a first driving frequency to a second driving frequency different from the first driving frequency, the touch vertical synchronization signal TVSYNC can be generated by modulating the initial pulse of the vertical synchronization signal VSYNC in at least one frame having the second driving frequency. Therefore, the driving timing of the touch panel 400 can be consistent with the driving timing of the display panel 200. Furthermore, in order to make the driving timing of the touch panel 400 consistent with the driving timing of the display panel 200, only the touch vertical synchronization signal line TVSYNCL is required, thus reducing the number of pins required by the touch panel driving section 300. Moreover, in the at least one frame having the second driving frequency, the touch vertical synchronization signal TVSYNC, which retains the remaining pulse of the vertical synchronization signal VSYNC, can be generated. Therefore, other driving operations of the touch panel 400 can remain unaffected. However, this has already been explained above, so a repeating explanation is omitted.

[0082] In at least one frame having the second driving frequency, the driving control unit 120 can modulate the voltage and number of the initial pulses of the vertical synchronization signal VSYNC. Specifically, when the second driving frequency is different, the voltage and number of the initial pulses of the touch vertical synchronization signal TVSYNC can be different in at least one frame having the second driving frequency.

[0083] For example, when the second driving frequency is 120Hz, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be 1.8V, and the number of initial pulses of the touch vertical synchronization signal TVSYNC can be two. For example, when the second driving frequency is 30Hz, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be -1.8V, and the number of initial pulses of the touch vertical synchronization signal TVSYNC can be two. For example, when the second driving frequency is 60Hz, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be 1.8V, and the number of initial pulses of the touch vertical synchronization signal TVSYNC can be one.

[0084] As described above, in the at least one frame having the second driving frequency, when the initial pulse of the vertical synchronization signal VSYNC is modulated to generate the touch vertical synchronization signal TVSYNC, the touch panel driving unit 300 can determine whether the touch driving frequency has changed based on the touch vertical synchronization signal TVSYNC. Furthermore, the touch panel driving unit 300 can determine the touch driving frequency based on the voltage and number of the initial pulse of the touch vertical synchronization signal TVSYNC.

[0085] In addition, Figures 3 to 6 In, such as Figure 2 As shown, the frame interval of the display panel 200 may include an active interval and a blank interval. In this case, in the at least one frame having the second driving frequency, the initial pulse of the vertical synchronization signal VSYNC may be included in the active interval. However, the present invention is not limited thereto.

[0086] Reference Figure 1 , Figure 2 and Figures 7 to 9 The frame interval of the display panel 200 may include a front shoulder interval FP, an effective interval ACT, and a rear shoulder interval BP. The frame interval of the display panel 200 may also include a variable front shoulder interval ΔFP. Figures 7 to 9 The effective interval ACT can be compared with Figure 2 The effective intervals AC1, AC2, and AC3 correspond to each other, and Figures 7 to 9 The anterior shoulder interval FP, the posterior shoulder interval BP, and the variable anterior shoulder interval ΔFP can be related to Figure 2 The blank intervals BL1, BL2, and BL3 correspond to each other.

[0087] In the front shoulder region FP, the drive control unit 120 can provide a synchronization signal to the external host processor. In the rear shoulder region BP, the external host processor can provide the vertical synchronization signal VSYNC and the input image data IMG to the drive control unit 120. That is, the front shoulder region FP and the rear shoulder region BP can be the regions where the timing of the external host processor and the timing of the drive control unit 120 are synchronized.

[0088] The effective range can be the range in which the data voltage VDATA is applied to the pixel.

[0089] When the display driving frequency is a frame frequency lower than the maximum driving frequency, the frame interval of the display panel 200 may include the variable front shoulder interval ΔFP. If the length of the variable front shoulder interval ΔFP increases, the display driving frequency may decrease. If the length of the variable front shoulder interval ΔFP decreases, the display driving frequency may increase. For example, the maximum driving frequency of the display driving frequency in the first frame interval FR1 may be the maximum driving frequency, and may be greater than the display driving frequency in the second frame interval FR2. In this case, the first frame interval FR1 may not include the variable front shoulder interval ΔFP, and the second frame interval FR2 may include the variable front shoulder interval ΔFP.

[0090] In this case, in at least one frame having the second drive frequency, the initial pulse of the vertical synchronization signal VSYNC may be included in the rear shoulder interval BP. However, the invention is not limited thereto.

[0091] like Figure 8 As shown, in at least one frame having the second driving frequency, the driving control unit 120 can modulate the voltage of the initial pulse of the vertical synchronization signal VSYNC. Specifically, when the second driving frequency is different, the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC can be different in at least one frame having the second driving frequency.

[0092] like Figure 9 As shown, in at least one frame having the second drive frequency, the drive control unit 120 can modulate the number of initial pulses of the vertical synchronization signal VSYNC. Specifically, when the second drive frequency is different, the number of initial pulses of the touch vertical synchronization signal TVSYNC can be different in at least one frame having the second drive frequency.

[0093] As described above, in the at least one frame having the second driving frequency, when the initial pulse of the vertical synchronization signal VSYNC is modulated to generate the touch vertical synchronization signal TVSYNC, the touch panel driving unit 300 can determine whether the touch driving frequency has changed based on the touch vertical synchronization signal TVSYNC. Furthermore, the touch panel driving unit 300 can determine the touch driving frequency based on the voltage of the initial pulse of the touch vertical synchronization signal TVSYNC.

[0094] Figure 10 This is a block diagram illustrating an electronic device 1000 according to an embodiment of the present invention. Figure 11 It is shown Figure 10The diagram shows an example of an electronic device 1000 implemented as a smartphone.

[0095] Reference Figure 10 and Figure 11 The electronic device 1000 may include a processor 1010, a memory device 1020, a storage device 1030, an input / output device 1040, a power supply 1050, and a display device 1060. In this case, the display device 1060 may be... Figure 1 The display device 10. Furthermore, the electronic device 1000 may also include multiple ports capable of communicating with video cards, sound cards, memory cards, USB devices, etc., or with other systems.

[0096] According to one embodiment, such as Figure 11 As shown, the electronic device 1000 can be implemented as a smartphone. However, this is exemplary, and the electronic device 1000 is not limited thereto. For example, the electronic device 1000 can be implemented as a mobile phone, video phone, smart tablet, smartwatch, tablet PC, vehicle navigation system, computer monitor, laptop computer, head-mounted display device, etc.

[0097] The processor 1010 may be a microprocessor, a central processing unit, an application processor, or the like. The processor 1010 can be connected to other components via an address bus, a control bus, and a data bus. According to an embodiment, the processor 1010 may also be connected to an expansion bus such as a peripheral component interconnect (PCI) bus.

[0098] The memory device 1020 can store data required for the operation of the electronic device 1000. For example, the memory device 1020 may include non-volatile memory devices such as erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory device, phase change random access memory (PRAM), resistance random access memory (RRAM), mano floating gate memory (NFGM), polymer random access memory (PoRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), and / or volatile memory devices such as dynamic random access memory (DRAM), static random access memory (SRAM), and dynamic random access memory (DRAM).

[0099] The storage device 1030 may include a solid-state drive (SSD), a hard disk drive (HDD), a compact disc read-only memory (CD-ROM), etc.

[0100] The input / output device 1040 may include input units such as a keyboard, keypad, touchpad, touch screen, mouse, etc., and output units such as a speaker, printer, etc. According to an embodiment, the display device 1060 may also be included in the input / output device 1040.

[0101] The power supply 1050 can supply the power required for the operation of the electronic device 1000.

[0102] The display device 1060 can be connected to other components via a bus or other communication link.

[0103] Industrial availability This invention can be applied to the display device described above and electronic devices including the display device. For example, this invention can be applied to car windows, mobile phones, smartphones, tablets, TVs, digital TVs, 3D TVs, PCs, home electronics, laptops, PDAs, PMPs, digital cameras, music players, portable game consoles, navigation systems, etc.

[0104] The above description refers to the embodiments, but those skilled in the art will understand that various modifications and alterations can be made to the present invention without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A display device, characterized in that, include: Display panel; displays images. Touch panel, senses touch; The display panel driving unit drives the display panel in a variable frequency mode and generates a touch vertical synchronization signal by modulating the vertical synchronization signal; as well as The touch panel driver unit determines the driving timing of the touch panel based on the touch vertical synchronization signal, and drives the touch panel in the variable frequency mode by making the driving timing of the touch panel consistent with the driving timing of the display panel.

2. The display device according to claim 1, characterized in that, When the driving frequency of the display panel changes from a first driving frequency to a second driving frequency that is different from the first driving frequency, in at least one frame having the second driving frequency, the display panel driving unit modulates the initial pulse of the vertical synchronization signal.

3. The display device according to claim 2, characterized in that, In the at least one frame having the second driving frequency, the display panel driving section maintains the remaining pulses of the vertical synchronization signal.

4. The display device according to claim 2, characterized in that, The display panel driver modulates the voltage of the initial pulse of the vertical synchronization signal.

5. The display device according to claim 4, characterized in that, When the second driving frequency is different, the voltage of the initial pulse of the touch vertical synchronization signal is different in the at least one frame having the second driving frequency.

6. The display device according to claim 2, characterized in that, The display panel driver modulates the voltage and number of the initial pulses of the vertical synchronization signal.

7. The display device according to claim 6, characterized in that, When the second driving frequency is different, the voltage and number of the initial pulses of the touch vertical synchronization signal are different in the at least one frame having the second driving frequency.

8. The display device according to claim 2, characterized in that, The frame range of the display panel includes a valid range and a blank range.

9. The display device according to claim 8, characterized in that, The initial pulse of the vertical synchronization signal is included in the effective interval.

10. The display device according to claim 2, characterized in that, The frame range of the display panel includes the front shoulder range, the effective range, and the rear shoulder range.

11. The display device according to claim 10, characterized in that, The initial pulse of the vertical synchronization signal is included in the rear shoulder region.

12. An electronic device, characterized in that, include: The host processor outputs a vertical synchronization signal; Display panel; displays images. Touch panel, senses touch; The display panel driving unit drives the display panel in a variable frequency mode and generates a touch vertical synchronization signal by modulating the vertical synchronization signal; as well as The touch panel driver unit determines the driving timing of the touch panel based on the touch vertical synchronization signal, and drives the touch panel in the variable frequency mode by making the driving timing of the touch panel consistent with the driving timing of the display panel.

13. The electronic device according to claim 12, characterized in that, When the driving frequency of the display panel changes from a first driving frequency to a second driving frequency that is different from the first driving frequency, in at least one frame having the second driving frequency, the display panel driving unit modulates the initial pulse of the vertical synchronization signal.

14. The electronic device according to claim 13, characterized in that, In the at least one frame having the second driving frequency, the display panel driving section maintains the remaining pulses of the vertical synchronization signal.

15. The electronic device according to claim 13, characterized in that, The display panel driver modulates the voltage of the initial pulse of the vertical synchronization signal.

16. The electronic device according to claim 15, characterized in that, When the second driving frequency is different, the voltage of the initial pulse of the touch vertical synchronization signal is different in the at least one frame having the second driving frequency.

17. The electronic device according to claim 13, characterized in that, The display panel driver modulates the voltage and number of the initial pulses of the vertical synchronization signal.

18. The electronic device according to claim 17, characterized in that, When the second driving frequency is different, the voltage and number of the initial pulses of the touch vertical synchronization signal are different in the at least one frame having the second driving frequency.

19. The electronic device according to claim 13, characterized in that, The frame range of the display panel includes a valid range and a blank range.

20. The electronic device according to claim 19, characterized in that, The initial pulse of the vertical synchronization signal is included in the effective interval.

Images