Touch display device and operation method thereof

Abstract

The invention provides a touch display device and an operation method of the touch display device. The touch display device comprises a touch display panel, a touch module and a display driving circuit. The touch display panel comprises a plurality of display areas. The touch module receives a touch sensing value. The display driving circuit obtains a plurality of brightness values corresponding to the plurality of display areas according to the image data. The touch module corrects a reference value according to the plurality of brightness values, and provides a touch sensing result based on a difference between the touch sensing value and the reference value.

Description

Technical Field

[0001] The present invention relates to an electronic device and an operating method of the electronic device, and in particular to a touch display device and an operating method of the touch display device. Background Art

[0002] The touch display device includes a touch display panel and a touch module. The touch module receives a touch sensing value. The touch display device provides a corresponding touch operation according to the touch sensing value. It should be noted that in the use scenarios such as hover sensing, proximity sensing or when the user wears gloves for touch sensing, the change in the display brightness of the touch display panel will interfere with the touch judgment of the touch display device. Summary of the invention

[0003] The present invention provides a touch display device and an operating method of the touch display device, which can reduce the interference of the change of the display brightness of the touch display panel on the touch judgment.

[0004] In one embodiment of the present invention, a touch display device includes a touch display panel, a touch control module, and a display driving circuit. The touch display panel includes a plurality of display areas. The touch display panel provides a touch sensing value. The display driving circuit is coupled to the touch display panel and the touch control module. The display driving circuit obtains a plurality of brightness values ​​corresponding to the plurality of display areas according to image data. The touch control module corrects a reference value according to the plurality of brightness values, and provides a touch sensing result based on a difference between the touch sensing value and the reference value.

[0005] In one embodiment of the present invention, an operation method is used for a touch display device. The touch display device includes a touch display panel and a touch module. The touch display panel includes multiple display areas. The operation method includes: receiving image data, and obtaining multiple brightness values ​​corresponding to the multiple display areas according to the image data; selecting the reference values ​​of the multiple display areas according to the multiple brightness values ​​by the touch module after the start time point of each vertical synchronization signal; and providing the touch sensing result by the touch module based on the difference between the touch sensing value and the reference value.

[0006] Based on the above, the touch display device provides a touch sensing result based on the difference between the touch sensing value and the reference value. It should be noted that the touch display device corrects the reference value based on the brightness value. The reference value can be changed based on the brightness value. Therefore, the present invention can reduce the interference of the change of the display brightness of the touch display panel on the touch judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic diagram of a touch display device according to an embodiment of the present invention;

[0008] Figure 2 is a schematic diagram of touch sensing values ​​and reference values ​​according to an embodiment of the present invention;

[0009] Figure 3 is a circuit diagram of a sub-pixel according to an embodiment of the present invention;

[0010] Figure 4 is a statistical schematic diagram shown according to an embodiment of the present invention;

[0011] Figure 5 is based on Figure 4 The schematic diagram shown;

[0012] Figure 6 is a flow chart of an operation method according to an embodiment of the present invention;

[0013] Figure 7 is a sensing timing diagram of sensing noise according to an embodiment of the present invention;

[0014] Figure 8 is a sensing timing diagram of sensing noise according to an embodiment of the present invention;

[0015] Fig. 9 is based on Figure 8 The schematic diagram shown;

[0016] Fig.10 is a waveform diagram of a horizontal synchronization signal according to an embodiment of the present invention;

[0017] Fig.11 is a flow chart of an operating method according to an embodiment of the present invention.

[0018] Description of Reference Numerals

[0019] 100, 200: Electronic devices

[0020] 110: Touch display panel

[0021] 120: Touch module

[0022] 130: Display driver circuit

[0023] A1~A4:Range

[0024] AA: Display range

[0025] BG, BG1, BG2: Baseline value

[0026] CC, CST: capacitors

[0027] DR1~DRn: Display area

[0028] FM1, FM2: Frame period

[0029] H1~H3: Statistical chart

[0030] HDISP, VDISP: Set the time length

[0031] HP, VP: Cycle

[0032] HS, VS: starting pulse

[0033] HSYNC, HSYNC1_1~HSYNC1_4: horizontal synchronization signal

[0034] IMG: Image data

[0035] LD: Light Emitting Diode

[0036] LU1~LUn: Brightness value

[0037] LUA~LUD: Brightness range

[0038] MC: Mutual capacitance sensing period

[0039] SNL1~SNLn: Touch sensing noise

[0040] RXSC, TXSC: Self-capacitance sensing period

[0041] S100, S200: How to operate

[0042] S110~S130, S210~S280: Steps

[0043] Sdata: data signal

[0044] SG1~SG3: Sensing period

[0045] NL: Noise sensing period

[0046] SPX: Sub-Pixel

[0047] SS, SS1, SS2: touch sensing value

[0048] Sscan: Scan signal

[0049] TD, TS: Transistor

[0050] td1, td2, td3, tfh, tfv, th1, tv1: time length

[0051] VDD: Reference high voltage

[0052] VSYNC: vertical synchronization signal DETAILED DESCRIPTION

[0053] Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The component symbols cited in the following description will be regarded as the same or similar components when the same component symbols appear in different drawings. These embodiments are only part of the present invention and do not disclose all possible implementation methods of the present invention. More specifically, these embodiments are only examples of the claims of the present invention.

[0054] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of a touch display device according to an embodiment of the present invention. In this embodiment, the touch display device 100 includes a touch display panel 110, a touch module 120 and a display driving circuit 130. The touch display panel 110 includes display areas DR1 to DRn. The touch display panel 110 can provide a display image according to image data IMG. The touch driving circuit 120 receives a touch sensing value SS.

[0055] In the present embodiment, the display driving circuit 130 is coupled to the touch display panel 110 and the touch module 120. The display driving circuit 130 receives the image data IMG. The display driving circuit 130 obtains the brightness values ​​LU1-LUn corresponding to the display regions DR1-DRn according to the image data IMG. For example, the display driving circuit 130 obtains the brightness value LU1 of the display region DR1 according to the image data IMG. The display driving circuit 130 obtains the brightness value LU2 of the display region DR2 according to the image data IMG, and so on.

[0056] The touch module 120 calibrates the reference value BG according to the brightness values ​​LU1 -LUn. In this embodiment, the reference value BG includes at least one reference value of a plurality of touch regions of the touch module 120 corresponding to the display regions DR1 -DRn.

[0057] The touch module 120 provides a touch sensing result based on the difference between the touch sensing value SS and the reference value BG.

[0058] It is worth mentioning that the display driving circuit 130 provides the brightness values ​​LU1-LUn to the touch module 120, and the touch module 120 corrects the reference value BG according to the brightness values ​​LU1-LUn. The reference value BG can be changed according to the brightness values ​​LU1-LUn. In this way, the touch display device 100 can reduce the interference of the change of the display brightness of the touch display panel 110 on the touch judgment.

[0059] Taking the display area DR1 as an example, the higher the brightness value LU1 of the display area DR1, the higher the first reference value of the first touch area corresponding to the display area DR1 in the touch module 120 (i.e., the touch area overlapping the display area DR1). The lower the brightness value LU1, the lower the first reference value. In some embodiments, based on different designs of the touch display device 100, the higher the brightness value LU1 of the display area DR1, the lower the first reference value. The lower the brightness value LU1 of the display area DR1, the higher the first reference value.

[0060] In this embodiment, the touch module 120 selects the reference value BG according to the brightness values ​​LU1-LUn after the start time point of each vertical synchronization signal. Therefore, the reference value BG selected by the touch module 120 is calculated from the brightness values ​​LU1-LUn corresponding to the display regions DR1-DRn.

[0061] Please refer to Figure 1 as well as Figure 2 , Figure 2 is a schematic diagram of touch sensing values ​​and reference values ​​according to an embodiment of the present invention. In this embodiment, Figure 2 The touch sensing value SS1 and the reference value BG1 (touch sensing value without touch behavior) corresponding to the touch behavior of the white screen are shown, as well as the touch sensing value SS2 and the reference value BG2 (touch sensing value without touch behavior) corresponding to the touch behavior of the black screen. In this embodiment, the reference value BG is used as a reference and a touch threshold must be exceeded before the touch module determines that the touch behavior occurs. This touch threshold can be adjusted according to needs, such as "50", but the present invention is not limited thereto.

[0062] The display region DR1 has a higher brightness value LU1 when displaying a white screen. The display region DR1 has a lower brightness value LU1 when displaying a black screen. The difference between the touch sensing value SS1 and the touch sensing value SS2 is caused by the different brightness values ​​LU1 of the display region DR1. Therefore, when the display region DR1 switches between the black screen and the white screen, the touch display device 100 cannot determine the touch behavior because the touch sensing value SS2 is less than the reference value BG1 for no touch behavior, or the touch sensing value SS1 is greater than the reference value BG2 for no touch behavior and the touch sensing wave value SS1 is mistakenly determined as having a touch behavior in the entire region. Therefore, the corresponding reference value BG1 or BG2 needs to be selected for the white screen and the black screen.

[0063] In this embodiment, the touch display device 100 can adjust the reference value BG according to the brightness value LU1 of the display area DR1. The display driving circuit 130 can obtain the picture displayed by the display area DR1 according to the image data IMG. When the display area DR1 displays a white picture according to the image data IMG, the touch module 120 selects the reference value BG1 according to the brightness value LU1 of the display area DR1. When the display area DR1 displays a black picture according to the image data IMG, the touch module 120 selects the reference value BG2 according to the brightness value LU1 of the display area DR1.

[0064] Taking the present embodiment as an example, the touch sensing value corresponding to the reference value BG1 of the white screen is approximately "1500". The touch sensing value corresponding to the reference value BG2 of the black screen is approximately "1350". It can be seen that during the touch operation, when the display area DR1 switches between the black screen and the white screen, if the touch threshold is set lower than "150", the touch behavior will be misjudged. In usage scenarios such as hover sensing, proximity sensing or the user wearing gloves for touch sensing, the fluctuation of the touch sensing values ​​SS1 and SS2 is usually lower than "100", and there is a risk of misjudgment of the touch behavior in the above usage scenarios. Therefore, when the display area DR1 displays a black screen according to the image data IMG, the touch module 120 adjusts the reference value BG to the reference value BG2. When the display area DR1 displays a white screen according to the image data IMG, the touch module 120 adjusts the reference value BG to the reference value BG1. In other words, when the display region DR1 switches between the white screen and the black screen, the reference value BG will also dynamically switch between the reference values ​​BG1 and BG2.

[0065] Please refer to Figure 1 as well as Figure 3 , Figure 3 1 is a circuit diagram of a sub-pixel according to an embodiment of the present invention. In this embodiment, the display region DR1 includes a sub-pixel SPX. The sub-pixel SPX includes a transistor TD, a TS, a capacitor CC, a CST and a light emitting diode LD. The first end of the transistor TS receives a data signal Sdata. The control end of the transistor TS receives a scan signal Sscan. The first end of the transistor TD receives a reference high voltage VDD. The control end of the transistor TD is coupled to the second end of the transistor TS. The anode of the light emitting diode LD is coupled to the second end of the transistor TD. The cathode of the light emitting diode LD is coupled to a reference low voltage (e.g., ground). The capacitor CC is coupled between the anode of the light emitting diode LD and the cathode of the light emitting diode LD. The capacitor CST is coupled between the first end of the transistor TD and the control end of the transistor TD.

[0066] The data signal Sdata is generated based on the image data IMG. It should be noted that the voltage value of the data signal Sdata affects the charge in the capacitor CC. The change in the voltage value of the data signal Sdata and the change in the charge in the capacitor CC will affect the touch sensing value without touch behavior (such as Figure 2 In other words, the brightness value LU1 will affect the touch sensing value of the non-touch behavior. Therefore, the touch display device 100 can obtain the touch sensing value due to the voltage value of the data signal Sdata according to the image data IMG, and the touch module 120 adjusts the reference value BG accordingly.

[0067] In some embodiments, the sub-pixel SPX may be a liquid crystal sub-pixel or other types of sub-pixel circuits, and the present invention is not limited to the sub-pixel SPX of this embodiment.

[0068] Please refer to Figure 1 as well as Figure 4 , Figure 4 It is a statistical schematic diagram shown according to an embodiment of the present invention. Figure 4 Statistical graphs H1 to H3 of the display area DR1 generated based on the image data IMG are shown. In this embodiment, the statistical graph H1 represents the brightness of the sub-pixel corresponding to the first color (e.g., red) of the image data IMG in the display area DR1. The statistical graph H2 represents the brightness of the sub-pixel corresponding to the second color (e.g., green) of the image data IMG in the display area DR1. The statistical graph H3 represents the brightness of the sub-pixel corresponding to the third color (e.g., blue) of the image data IMG in the display area DR1. The statistical graphs H1 to H3 can be implemented by any form of distribution graph (e.g., curve graph, histogram).

[0069] In this embodiment, the display driving circuit 120 can count the sub-pixel brightness based on the image data IMG to generate statistical graphs H1 - H3 and calculate the brightness value LU1 according to the statistical graphs H1 - H3. In the present invention, the statistical graph can be one or more and is not limited to this embodiment.

[0070] Please refer to Figure 1 , Figure 4 as well as Figure 5 , Figure 5 is based on Figure 4 Schematic diagram shown. Figure 5The display range AA including a plurality of sub-pixels SPX is shown. In the present embodiment, the display range AA may be determined based on the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC. For example, the display range AA is determined by the set time length VDISP of the vertical synchronization signal VSYNC and the set time length HDISP of the horizontal synchronization signal HSYNC. In the period VP of the vertical synchronization signal VSYNC, the set time length VDISP is the time length between the time length tv1 after the start pulse VS of the vertical synchronization signal VSYNC and the time length tfv. In the plurality of periods HP of the horizontal synchronization signal HSYNC, the set time length HDISP is the time length between the time length th1 after the start pulse HS of the horizontal synchronization signal HSYNC and the time length tfh. The display range AA includes the display area DR1. The display driving circuit 120 may count the brightness of the sub-pixels of the display area DR1 in the display range AA based on the image data IMG to generate statistical graphs H1-H3, and calculate the brightness value LU1 according to the statistical graphs H1-H3. In this embodiment, the time lengths tv1, tfv, th1, and tfh can be adjusted according to actual usage requirements.

[0071] Please refer to Figure 1 as well as Figure 6 , Figure 6 is a flow chart of an operation method according to an embodiment of the present invention. In this embodiment, the operation method S100 is applicable to the touch display device 100. The operation method S100 includes steps S110 to S130.

[0072] In step S110, the display driving circuit 130 receives the image data IMG, and obtains the brightness values ​​LU1-LUn corresponding to the display areas DR1-DRn according to the image data IMG. In step S120, the touch control module 120 calibrates the reference value BG according to the brightness values ​​LU1-LUn provided by the display driving circuit 130. In step S130, the touch control module 120 provides a touch sensing result based on the difference between the touch sensing value SS and the reference value BG. The implementation details of steps S110-S130 have been described in detail. Figure 1 , Figure 2 as well as Figure 4 This is clearly described in the embodiments, so it will not be repeated here.

[0073] In the present embodiment, the touch module 120 also has touch sensing noises SNL1-SNLn from the touch module 120 itself. The touch module 120 can calculate a more suitable reference value BG according to the brightness values ​​LU1-LUn and the touch sensing noises SNL1-SNLn. For example, the touch module 120 can generate the reference value BG1 according to the brightness value LU1 of the display area DR1 and the touch sensing noise SNL1 of the touch sensing area corresponding to the display area DR1. The reference value BG1 at this time is used as the touch sensing from the touch sensing area corresponding to the display area DR1. The touch module 120 can generate the reference value BG2 according to the brightness value LU2 of the display area DR2 and the touch sensing noise SNL2 of the touch sensing area corresponding to the display area DR2. The reference value BG2 at this time is used as the touch sensing from the touch sensing area corresponding to the display area DR2. For example, the touch sensing noises SNL1-SNLn each include mutual capacitance sensing noise, self capacitance sensing noise and noise sensing.

[0074] Please refer to Figure 1 as well as Figure 7 , Figure 7 is a timing diagram of sensing noise according to an embodiment of the present invention. In this embodiment, Figure 7 The vertical synchronization signal VSYNC, the data signal Sdata, the horizontal synchronization signal HSYNC, and the touch sensing periods SG1 to SG3 are shown. In the frame period FM1, the touch module 120 receives the touch sensing noise SNL1 based on the time length td1 after the start time point of the vertical synchronization signal VSYNC. In other words, the touch module 120 can obtain the touch sensing noise SNL1 in the touch sensing period SG1. The touch module 120 receives the touch sensing noise SNL2 based on the time length td2 after the start time point of the vertical synchronization signal VSYNC. In other words, the touch module 120 can obtain the touch sensing noise SNL2 in the touch sensing period SG2. The touch module 120 receives the touch sensing noise SNL3 based on the time length td3 after the start time point of the vertical synchronization signal VSYNC. In other words, the touch module 120 can obtain the touch sensing noise SNL3 in the touch sensing period SG3.

[0075] The implementation details of the frame period FM2 have been clearly described in the embodiment of the frame period FM1 and will not be repeated here.

[0076] It should be noted that, in different frame periods FM1 and FM2, the touch sensing noise SNL1 is generated based on the same time length td1. The touch sensing noise SNL2 is generated based on the same time length td2. The touch sensing noise SNL3 is generated based on the same time length td3. The time lengths td1, td2, and td3 are integer multiples of the period of the horizontal synchronization signal HSYNC. Therefore, in different frame periods FM1 and FM2, the touch module 120 can receive the touch sensing noise SNL1 of the first touch sensing area, the touch sensing noise SNL2 of the second touch sensing area, and the touch sensing noise SNL3 of the third touch sensing area at a fixed time point.

[0077] Take the touch sensing period SG1 as an example, please refer to Figure 1 as well as Figure 8 , Figure 8 is a timing diagram of sensing noise according to an embodiment of the present invention. In this embodiment, Figure 8 1 shows a horizontal synchronization signal HSYNC and a touch sensing period SG1. The touch sensing period SG1 includes a mutual capacitance sensing period MC, a self capacitance sensing period RXSC, TXSC, and a noise sensing period NL. The touch module 120 uses the horizontal synchronization signal HSYNC as an operating frequency. Based on the cycle of the horizontal synchronization signal HSYNC, the mutual capacitance sensing period MC, the self capacitance sensing period RXSC, TXSC, and the noise sensing period NL are sequentially executed. During the mutual capacitance sensing period MC, the touch module 120 receives the mutual capacitance sensing noise corresponding to the first touch sensing area in the mutual capacitance mode. During the self capacitance sensing period RXSC, the touch module 120 receives the self capacitance sensing noise corresponding to the receiving (RX) electrode of the first touch sensing area in the self capacitance mode. During the self capacitance sensing period TXSC, the touch module 120 receives the self capacitance sensing noise corresponding to the transmitting (TX) electrode of the first touch sensing area in the self capacitance mode. In addition, the touch module 120 receives the sensing noise NL1 during the noise sensing period NL. Therefore, the touch module 120 may sum up the mutual capacitance sensing noise, the self capacitance sensing noise, and the sensing noise NL1 to generate the touch sensing noise SNL1.

[0078] In some embodiments, the touch module 120 can receive the mutual capacitance sensing noise, the self capacitance sensing noise, and the sensing noise NL1 respectively.

[0079] In this embodiment, the order of the mutual capacitance sensing period MC, the self capacitance sensing period RXSC, TXSC and the noise sensing period NL can be adjusted, and is not limited to the order of this embodiment. The time length of the mutual capacitance sensing period MC, the self capacitance sensing period RXSC, TXSC and the noise sensing period NL can be changed based on the actual design, and is not limited to the time length of this embodiment. In addition, the time length of the interval between two adjacent periods among the mutual capacitance sensing period MC, the self capacitance sensing period RXSC, TXSC and the noise sensing period NL can be changed based on the actual design, and is not limited to the time length of this embodiment.

[0080] In some embodiments, the display driver circuit 130 and the touch module 120 may be a touch display driver chip (TDDI). In other embodiments, the display driver circuit 130 and the touch module 120 are different chips. Therefore, the touch module 120 may be limited by hardware and cannot receive too much information from the display driver circuit 120. In this embodiment, the display driver circuit 120 can modulate the duty cycle of the horizontal synchronization signals HSYNC1-HSYNCn according to the brightness values ​​LU1-LUn of the image data IMG, and provide the brightness values ​​LU1-LUn to the touch module 120. The touch module 120 can select the reference value BG according to the duty cycle of the horizontal synchronization signals HSYNC1-HSYNCn.

[0081] Please refer to Figure 1 , Figure 8 as well as Fig. 9 , Fig. 9 is based on Figure 8 Schematic diagram shown. Fig. 9 The display range AA is shown. The determination method of the display range AA has been Figure 1 , Figure 4 as well as Figure 5 The above is clearly described, so it will not be repeated here. In this embodiment, Fig. 9 Also shown are a range A1 corresponding to the mutual capacitance sensing period MC, a range A2 during the self capacitance sensing period RXSC, a range A3 during the self capacitance sensing period TXSC, and a range A4 during the noise sensing period NL. It should be noted that the ranges A1 to A4 are within the display range AA. The display range AA includes the display area DR1. Therefore, in terms of timing, the mutual capacitance sensing period MC, the self capacitance sensing periods RXSC, TXSC, and the noise sensing period NL may correspond to or match the period during which the display driving circuit 120 obtains the brightness value LU1 corresponding to the display area DR1.

[0082] Please refer to Figure 1 as well as Fig.10 , Fig.10: is a waveform diagram of a horizontal synchronization signal according to an embodiment of the present invention. In this embodiment, the brightness value is divided into brightness value intervals LUA to LUD, and the duty cycles of the horizontal synchronization signals HSYNC1_1 to HSYNC1_4 represent the brightness intervals LUA to LUD. When the brightness value LU1 is within the brightness interval LUA, the display driving circuit 130 adjusts the horizontal synchronization signal HSYNC to the horizontal synchronization signal HSYNC1_1. The horizontal synchronization signal HSYNC1_1 has the lowest duty cycle. For example, when the brightness value LU1 is within the brightness interval LUB, the display driving circuit 130 adjusts the horizontal synchronization signal HSYNC to the horizontal synchronization signal HSYNC1_2. The duty cycle of the horizontal synchronization signal HSYNC1_2 is the first multiple of the duty cycle of the horizontal synchronization signal HSYNC1_1. When the brightness value LU1 is within the brightness interval LUC, the display driving circuit 130 adjusts the horizontal synchronization signal HSYNC to the horizontal synchronization signal HSYNC1_3. The duty cycle of the horizontal synchronization signal HSYNC1_3 is the second multiple of the duty cycle of the horizontal synchronization signal HSYNC1_1. The second multiple is greater than the first multiple. When the brightness value LU1 is within the brightness interval LUD, the display driving circuit 130 adjusts the horizontal synchronization signal HSYNC to the horizontal synchronization signal HSYNC1_4. The duty cycle of the horizontal synchronization signal HSYNC1_4 is the third multiple of the duty cycle of the horizontal synchronization signal HSYNC1_1 or has the highest duty cycle. The third multiple is greater than the second multiple.

[0083] Therefore, the touch control module 130 can obtain information about the brightness value LU based on the working cycle of the horizontal synchronization signal HSYNC.

[0084] In some embodiments, the brightness value LU1 is negatively correlated with the duty cycle of the horizontal synchronization signal HSYNC1. The lower the brightness value LU1, the higher the duty cycle of the horizontal synchronization signal HSYNC1. The higher the brightness value LU1, the lower the duty cycle of the horizontal synchronization signal HSYNC1. For example, when the brightness value LU1 is the lowest value, the display driving circuit 231 adjusts the horizontal synchronization signal HSYNC to the horizontal synchronization signal HSYNC1_n. When the brightness value LU1 is the highest value, the display driving circuit 231 adjusts the horizontal synchronization signal HSYNC to the horizontal synchronization signal HSYNC1_1.

[0085] Please refer to Figure 1 as well as Fig.11 , Fig.11 is a flow chart of an operation method according to an embodiment of the present invention. In this embodiment, the operation method S200 is applicable to the touch display device 100. The operation method S200 includes steps S210-S280.

[0086] In step S210 , the touch control module 120 stores a plurality of reference values. For example, the plurality of reference values ​​BG are stored in a register or a lookup table. The plurality of reference values ​​can be input or established by using an interpolation method.

[0087] In step S220, the display driving circuit 130 receives the image data IMG. In step S230, the display driving circuit 130 performs statistics on the image data IMG to obtain the brightness values ​​LU1-LUn corresponding to the display areas DR1-DRn. The implementation details of step S230 have been described in detail. Figure 4 This is clearly described in the embodiments, so it will not be repeated here.

[0088] In step S240, the display driving circuit 130 provides corresponding horizontal synchronization signals HSYNC1-HSYNCn according to the brightness values ​​LU1-LUn. The implementation details of step S240 have been described in detail. Fig.11 This is clearly described in the embodiments, so it will not be repeated here.

[0089] In step S250 , the touch module 120 receives the horizontal synchronization signals HSYNC1 ˜HSYNCn from the display driving circuit 130 , and obtains the brightness values ​​LU1 ˜LUn according to the horizontal synchronization signals HSYNC1 ˜HSYNCn.

[0090] In step S260 , the touch module 120 obtains touch sensing noises SNL1 ˜SNLn.

[0091] In step S270 , the touch module 120 selects a suitable reference value from the plurality of reference values ​​according to the brightness values ​​LU1 ˜LUn and the touch sensing noises SNL1 ˜SNLn. In step S280 , a touch operation is performed according to the selected suitable reference value BG.

[0092] In summary, the touch display device provides a touch sensing result based on the difference between the touch sensing value and the reference value. It should be noted that the touch display device provides the reference value based on the brightness value. The reference value can be changed according to the brightness value. Therefore, the present invention can reduce the interference of the change of the display brightness of the touch display panel on the touch judgment. In addition, in some embodiments, the touch display device provides the reference value based on the brightness value and the touch sensing noise, thereby improving the accuracy of the reference value.

[0093] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A touch display device, characterized in that: The touch display device comprises: A touch display panel, comprising a plurality of display areas; A touch module configured to receive a touch sensing value; and A display driving circuit is coupled to the touch display panel and the touch module, and is configured to receive image data and obtain a plurality of brightness values ​​corresponding to the plurality of display areas according to the image data. The touch control module selects reference values ​​of the plurality of display areas according to the plurality of brightness values, and provides a touch control sensing result based on a difference between the touch control sensing value and the reference value.

2. The touch display device according to claim 1, characterized in that: The touch control module calculates the reference values ​​of the plurality of display areas according to the plurality of brightness values ​​after a starting time point of each vertical synchronization signal.

3. The touch display device according to claim 1, characterized in that: The higher the first brightness value of a first display area among the plurality of display areas, the higher the first reference value of a first touch area in the touch module corresponding to the first display area, and The lower the first brightness value is, the lower the first reference value is.

4. The touch display device according to claim 1, wherein: The lower the first brightness value of a first display area among the plurality of display areas, the higher the first reference value of a first touch area in the touch module corresponding to the first display area, and The higher the first brightness value is, the lower the first reference value is.

5. The touch display device according to claim 1, characterized in that: The touch module provides the reference value according to the touch sensing noise, and The touch sensing noise includes at least one of mutual capacitance sensing noise, self capacitance sensing noise and noise sensing.

6. The touch display device according to claim 5, characterized in that: The touch module obtains a first brightness value of a first display area among the plurality of display areas and receives a first touch sensing noise of a first touch area corresponding to the first display area, and provides a reference value according to the first brightness value and the first touch sensing noise.

7. The touch display device according to claim 6, characterized in that: The touch module receives the first touch sensing noise based on a first time length after a start time point of each vertical synchronization signal.

8. The touch display device according to claim 7, characterized in that: The first time length is an integer multiple of a period of the horizontal synchronization signal.

9. The touch display device according to claim 1, characterized in that: The display driving circuit generates a plurality of horizontal synchronization signals according to the plurality of brightness values, and A duty cycle of a first horizontal synchronization signal among the plurality of horizontal synchronization signals corresponds to a first brightness value of a first display area among the plurality of display areas.

10. The touch display device according to claim 9, characterized in that: When the first brightness value is within a first brightness interval, the display driving circuit adjusts the duty cycle of the first horizontal synchronization signal to a first duty cycle, When the first brightness value is within a second brightness interval, the display driving circuit adjusts the duty cycle of the first horizontal synchronization signal to a second duty cycle, The first brightness range is different from the second brightness range, and The first duty cycle is different from the second duty cycle.

11. The touch display device according to claim 1, characterized in that: The display driving circuit calculates the sub-pixel brightness of a first display area among the plurality of display areas based on the image data to generate at least one statistical graph, and calculates a first brightness value corresponding to the first display area according to the at least one statistical graph.

12. The touch display device according to claim 11, characterized in that: The at least one statistical graph includes a first statistical graph, a second statistical graph and a third statistical graph, The first statistical chart shows a first statistical chart of the brightness of the first sub-pixel corresponding to the first color of the image data in the first display area. The second statistical chart shows a second statistical chart of the brightness of the second sub-pixel corresponding to the second color of the image data in the first display area, and The third statistical graph shows a third statistical graph of brightness of a third sub-pixel corresponding to a third color of the image data in the first display area.

13. An operating method for a touch display device, characterized in that: The touch display device comprises a touch display panel and a touch module, wherein the touch display panel comprises a plurality of display areas, and the operation method comprises: receiving image data, and obtaining a plurality of brightness values ​​corresponding to the plurality of display areas according to the image data; The touch control module selects reference values ​​of the plurality of display areas according to the plurality of brightness values; and The touch sensing module provides a touch sensing result based on a difference between the touch sensing value and the reference value.

14. The operating method according to claim 13, characterized in that: The step of selecting the reference values ​​of the plurality of display areas according to the plurality of brightness values ​​comprises: The touch control module calculates the reference values ​​of the plurality of display areas according to the plurality of brightness values ​​after a starting time point of each vertical synchronization signal.

15. The operating method according to claim 13, characterized in that: The higher the first brightness value of a first display area among the plurality of display areas, the higher the first reference value of a first touch area in the touch module corresponding to the first display area; as well as The lower the first brightness value is, the lower the first reference value is.

16. The operating method according to claim 13, characterized in that: The lower the first brightness value of a first display area among the plurality of display areas, the higher the first reference value of a first touch area in the touch module corresponding to the first display area; as well as The higher the first brightness value is, the lower the first reference value is.

17. The operating method according to claim 13, characterized in that: The step of selecting the reference values ​​of the plurality of display areas according to the plurality of brightness values ​​comprises: The reference value is provided according to the plurality of brightness values ​​and touch sensing noise, wherein the sensing noise includes at least one of mutual capacitance sensing noise and self capacitance sensing noise.

18. The operating method according to claim 17, characterized in that: The step of providing the reference value according to the plurality of brightness values ​​and the touch sensing noise comprises: Obtaining a first brightness value of a first display area among the plurality of display areas and receiving a first touch sensing noise of a first touch area corresponding to the first display area; and A first reference value is provided according to the first brightness value and the first touch sensing noise.

19. The operating method according to claim 18, characterized in that: The operation method further includes: A first sensing noise is received based on a first time length after a start time point of each vertical synchronization signal.

20. The operating method according to claim 19, characterized in that: The first time length is an integer multiple of a period of the horizontal synchronization signal.

21. The operating method according to claim 13, characterized in that: The operation method also includes: A plurality of horizontal synchronization signals are generated according to the plurality of brightness values, wherein a duty cycle of a first horizontal synchronization signal among the plurality of horizontal synchronization signals corresponds to a first brightness value of a first display area among the plurality of display areas.

22. The operating method according to claim 21, characterized in that: The operation method also includes: When the first brightness value is within a first brightness interval, adjusting the duty cycle of the first horizontal synchronization signal to a first duty cycle; and When the first brightness value is within a second brightness interval, adjusting the duty cycle of the first horizontal synchronization signal to a second duty cycle, wherein the first brightness range is different from the second brightness range, and The first working cycle is different from the second working cycle.

23. The operating method according to claim 13, characterized in that: The step of obtaining the plurality of brightness values ​​corresponding to the plurality of display areas according to the image data comprises: The sub-pixel brightness of a first display area among the plurality of display areas is calculated based on the image data to generate at least one statistical graph, and a first brightness value corresponding to the first display area is calculated according to the at least one statistical graph.

24. The operating method according to claim 23, characterized in that: The at least one statistical graph includes a first statistical graph, a second statistical graph and a third statistical graph, The first statistical chart shows a first statistical chart of the brightness of the first sub-pixel corresponding to the first color of the image data in the first display area. The second statistical chart shows a second statistical chart of the brightness of the second sub-pixel corresponding to the second color of the image data in the first display area, and The third statistical graph shows a third statistical graph of brightness of a third sub-pixel corresponding to a third color of the image data in the first display area.

Images