Display device including touch screen panel and method of operating touch driving circuit

Abstract

A display device and an operating method of a touch driving circuit for driving a touch panel are provided. The display device includes a touch screen panel including a touch panel and a display panel stacked below the touch panel, a touch driving circuit, and one or more reels on which at least a portion of the touch screen panel is wound. The touch panel can include reception electrodes extending in a first axis direction and arranged in parallel in a second axis direction perpendicular to the first axis direction, and driving electrodes extending in the second axis direction and arranged in parallel in the first axis direction. The display panel can include gate lines and source lines intersecting the gate lines. The touch driving circuit can be configured to apply a driving signal to the driving electrodes. The touch screen panel wound on the one or more reels can be unwound as the one or more reels are slid in the first axis direction.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2020-0179931 filed with the Korean Intellectual Property Office on December 21, 2020, and Korean Patent Application No. 10-2021-0074302 filed with the Korean Intellectual Property Office on June 8, 2021, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] The embodiments relate to a display device, and more specifically, to a display device including a touch screen panel. Background Technology

[0004] The display device may include a touch screen panel (TSP), which may include a display panel for image display and a touch panel for touch sensing. Summary of the Invention

[0005] The embodiment relates to a display device, comprising: a touch screen panel including a touch panel and a display panel stacked below the touch screen panel; touch driving circuitry; and one or more spools, with at least a portion of the touch screen panel wound on the one or more spools. The touch screen panel may include a plurality of receiving electrodes and a plurality of driving electrodes, the plurality of receiving electrodes extending in a first axial direction and arranged parallel to each other in a second axial direction perpendicular to the first axial direction, and the plurality of driving electrodes extending in the second axial direction and arranged parallel to each other in the first axial direction. The display panel may include a plurality of gate lines and a plurality of source lines intersecting the plurality of gate lines. The touch driving circuitry may be configured to apply a plurality of driving signals to the plurality of driving electrodes. The touch screen panel wound on the one or more spools may unfold as the one or more spools slide in the first axial direction.

[0006] The embodiment relates to an operation method for a touch driving circuit for driving a touch panel. The touch panel includes a plurality of driving electrodes and a plurality of receiving electrodes intersecting the plurality of driving electrodes. The operation method includes: applying a driving signal to the plurality of driving electrodes; receiving a first sensing signal for sensing mutual capacitance formed between sensing nodes formed at the intersection of the plurality of driving electrodes and the plurality of receiving electrodes; receiving a second sensing signal for sensing self-capacitance between the plurality of driving electrodes and a ground plane; compensating the first sensing signal based on the second sensing signal; and calculating touch coordinates of a touch input on the touch panel.

[0007] The embodiment relates to a display device, including: a touch screen panel, which includes a touch panel and a display panel stacked below the touch screen panel; and a plurality of spools, with at least a portion of the touch screen panel wound on the plurality of spools. The touch screen panel may include a plurality of receiving electrodes and a plurality of driving electrodes, the plurality of receiving electrodes extending in a first axial direction and arranged parallel to each other in a second axial direction perpendicular to the first axial direction, and the plurality of driving electrodes extending in the second axial direction and arranged parallel to each other in the first axial direction. The display panel may include a plurality of gate lines extending in the first axial direction and a plurality of source lines extending in the second axial direction. The touch screen panel can be expanded by sliding the plurality of spools in opposite directions in the first axial direction. Attached Figure Description

[0008] Features will become apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0009] Figure 1 This is a block diagram of a display device according to an example embodiment;

[0010] Figure 2 This is a diagram illustrating a display device according to an example embodiment;

[0011] Figure 3 This is a block diagram of a display device according to an example embodiment;

[0012] Figure 4 This is a diagram illustrating a display device according to an example embodiment;

[0013] Figure 5 This is a block diagram of a display device according to an example embodiment;

[0014] Figure 6 This is a flowchart illustrating an operation method of a touch controller according to an example embodiment;

[0015] Figure 7 This is a diagram illustrating a display device according to an example embodiment;

[0016] Figure 8 This is a flowchart illustrating an operation method of a touch controller according to an example embodiment;

[0017] Figure 9 This is a diagram illustrating a display device according to an example embodiment;

[0018] Figure 10 This is a diagram illustrating a display device according to an example embodiment; and

[0019] Figure 11 This is a block diagram of a touchscreen system according to an example embodiment. Detailed Implementation

[0020] Figure 1 This is a block diagram of a display device 10 according to an example embodiment.

[0021] Reference Figure 1 The display device 10 may include a touch panel 100, a display panel 110, and a touch driving circuit 120 for driving the touch panel 100. The touch panel 100 may be stacked on the display panel 110 to form a touch screen panel 112, or the touch panel 100 may be integrally formed with the display panel 110 to form a touch screen panel 112.

[0022] The touchscreen panel 112 can be formed on a flexible plastic substrate. The shape of the touchscreen panel 112 can be flexible or freely changeable; the touchscreen panel 112 can be referred to as a flexible panel. For example, the touchscreen panel 112 can be variable in various forms, such as bendable, foldable, or rollable. The display device 10 can be, for example, a rollable display device, where a portion of the touchscreen panel 112 can be rolled up or unrolled. The rollable display device 10 can include a reel (e.g., Figure 2 At least a portion of the touchscreen panel 112 is wound around a reel 200. The touchscreen panel 112 can be extended when the reel slides in a first axial direction (e.g., the Y-axis) or a second axial direction (e.g., the X-axis).

[0023] The touch panel 100 can sense touch (or touch input) on the touch panel 100 and output a sensing signal. In this case, touch may include not only direct contact of a conductive object (e.g., a user's finger, palm, stylus, or pen) on the touch panel 100, but also the proximity of a conductive object to the touch panel 100.

[0024] Touch panel 100 may be stacked on display panel 110 and may be attached to the front surface of display panel 110 (e.g., the surface that emits light signals). For example, touch panel 100 may cover the front surface of display panel 110.

[0025] Touch panel 100 can be implemented as a transparent panel with a touch-sensitive surface. Touch panel 100 can be implemented as a touch sensor array patterned with transparent electrodes. For example, touch panel 100 may include transparent electrodes with a grid pattern. Touch panel 100 may include multiple electrodes (e.g., multiple receiving electrodes RE and multiple driving electrodes TE) that intersect each other in a matrix. Multiple sensing nodes (or touch units) may be formed at the intersections of the multiple receiving electrodes RE and the multiple driving electrodes TE.

[0026] Multiple electrodes (e.g., multiple receiving electrodes RE and multiple driving electrodes TE) may have a noise-reducing arrangement that can be altered as the touchscreen panel 112 is rolled up or unrolled. The display device 10 may include multiple driving electrodes TE arranged in parallel in a first axial direction (e.g., the Y-axis direction) to reduce external noise generated in the first axial direction. The display device 10 may include multiple receiving electrodes RE arranged in parallel in a second axial direction (e.g., the X-axis direction) to reduce display noise generated in the second axial direction (e.g., as discussed below, noise generated when a source voltage is applied (i.e., display noise) can be generated in the second axial direction where multiple source lines SL are arranged).

[0027] Touch panel 100 can output a sensing signal to touch driving circuit 120 according to one of various touch sensing methods. For example, touch panel 100 can output a sensing signal using multiple electrodes according to a capacitance sensing method. For example, touch panel 100 can output a sensing signal representing the mutual capacitance formed in multiple sensing nodes, and can output a sensing signal representing the self-capacitance formed between multiple receiving electrodes RE or multiple transmitting electrodes (i.e., multiple driving electrodes TE) and the ground plane.

[0028] The display panel 110 may include multiple gate lines, multiple source lines, and multiple pixels arranged in a matrix at the intersections of the multiple gate lines and multiple source lines.

[0029] Multiple pixels can display an image based on image signals received through multiple source lines and multiple gate lines.

[0030] The display device 10 may further include a display driving circuit (not shown) for applying a driving signal to each of the plurality of source lines and the plurality of gate lines.

[0031] The display panel 110 may be or include, for example, a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic LED (OLED) display, an active matrix OLED (AMOLED) display, an electrochromic display (ECD), a digital mirror display (DMD), an actuated mirror device (AMD), a grating light valve (GLV), a plasma display panel (PDP), an electroluminescent display (ELD), a vacuum fluorescent display (VFD), etc.

[0032] Although the touch panel 100 and the display panel 110 are in Figure 1 While shown as separate components, the electrodes of the touch panel 100 can be implemented as an on-cell type panel where the electrodes are arranged on the pixels of the display panel 110. For example, the display panel 110 may include a flexible OLED, and the electrodes of the touch panel 100 may be arranged on the pixels of the display panel 110 to provide a flexible structure.

[0033] The touch driving circuit 120 can apply a driving signal to the touch panel 100. The touch driving circuit 120 may include a transmitting circuit 130, a receiving circuit 140, and a touch controller 150.

[0034] The transmitting circuit 130 may include a plurality of transmitters TX, each of which can apply a driving signal to a corresponding driving electrode TE.

[0035] The receiving circuit 140 may include a plurality of receivers RX, each of which can receive a plurality of sensing signals from a plurality of receiving electrodes RE. Each of the plurality of receivers RX may be connected to a corresponding receiving electrode RE to receive a sensing signal, or may be connected in a time-division manner to at least two receiving electrodes RE to receive at least two sensing signals.

[0036] The touch controller 150 can control the operating timing and operating state of the transmitting circuit 130 and the receiving circuit 140. The touch controller 150 can receive sensing signals from the receiving circuit 140, and based on the received sensing signals, calculate whether a touch input has occurred, and calculate the location (i.e., touch coordinates) where the touch input has occurred. The touch controller 150 can provide the touch coordinates to the host (not shown).

[0037] The touch controller 150 can compensate for noise that changes as the touchscreen panel 112 is rolled up or unrolled. For example, the touch controller 150 can receive a first sensing signal for sensing the mutual capacitance between a plurality of driving electrodes TE and a plurality of receiving electrodes RE, can receive a second sensing signal for sensing the self-capacitance between the plurality of driving electrodes TE and the ground plane, and can compensate for external noise by summing the first sensing signal and the second sensing signal.

[0038] When the touchscreen panel 112 is rolled up or unrolled, the capacitance value sensed by the touchscreen panel 112 in the absence of touch input can change. For example, when the touchscreen panel 112 is rolled up, the motherboard, battery, etc., mounted on the display device 10 will be in close contact with each other, thus increasing the ambient temperature of the touchscreen panel 112. In this case, depending on the change in ambient temperature, deviations or errors may occur in the values ​​sensed by each of the sensing nodes. To compensate for or resolve the effects on the capacitance value (e.g., temperature-dependent), the touch controller 150 can periodically receive sensed values ​​from the touchscreen panel 112 in a state or environment without touch input, and can perform environmental compensation to adjust the sensing nodes to uniform reference values. Therefore, the display device 10 can respond to shape changes (e.g., due to being rolled up or unrolled) by performing sensing for environmental compensation.

[0039] The display device 10 can be installed on various electronic devices. For example, the display device 10 can be an electronic device such as a smartphone, tablet PC, e-reader, personal digital assistant (PDA), portable multimedia player (PMP), mobile terminal, wearable device, Internet of Things (IoT) device, refrigerator, or navigation device. Furthermore, the display device 10 can be installed on electronic devices provided as components in vehicles, furniture, manufacturing equipment, doors, various measuring devices, etc.

[0040] Figure 2 This is a diagram illustrating a display device 20 according to an example embodiment.

[0041] Reference Figure 2 The display device 20 may have a form in which at least a portion of the variable screen panel 220 can be rolled up or unfolded.

[0042] The display device 20 may include a scroll 200, a fixed screen panel 210, and a variable screen panel 220.

[0043] Figure 2 The touch screen panel of the display device 20 shown may include a fixed screen panel 210 and a variable screen panel 220, but the touch screen panel of the display device 20 may include only, for example, the variable screen panel 220.

[0044] The scroll 200 may include a rotatable configuration, for example, it may include bearings. The fixed screen panel 210 may be a panel fixed to the display device 20, and the variable screen panel 220 may be a panel that is wound or unwound by rotation of the scroll 200. When the scroll 200 slides in a first axial direction (e.g., the negative Y-axis direction), at least a portion of the variable screen panel 220 may be wound around the scroll 200. When the scroll 200 slides in a first axial direction (e.g., the positive Y-axis direction), at least a portion of the variable screen panel 220 wound around the scroll 200 may be unwound. Therefore, the display of the display device 20 can be expanded or reduced.

[0045] The fixed screen panel 210 and the variable screen panel 220 may include a plurality of electrodes (e.g., a plurality of receiving electrodes RE and a plurality of driving electrodes TE) that intersect each other in a matrix.

[0046] Multiple receiving electrodes RE can extend in the sliding direction of the reel 200. For example, multiple receiving electrodes RE can extend in a first axial direction (e.g., the Y-axis direction) and can be arranged in parallel in a second axial direction (e.g., the X-axis direction) perpendicular to the first axial direction.

[0047] Multiple drive electrodes TE may intersect with multiple receive electrodes RE and may extend in a direction perpendicular to the sliding direction of the roll 200. For example, each of the multiple drive electrodes TE may extend in a second axial direction and may be arranged parallel to each other in the first axial direction. The multiple drive electrodes TE may be provided in as many numbers as possible to fit the area or region of the scalable, variable screen panel 220.

[0048] By utilizing the arrangement of multiple electrodes, the display device 20 can operate to reduce noise that changes as the variable screen panel 220 is wound or unfolded. For example, display noise can be generated in the display device 10 in the second axial direction. The display noise can be filtered by a filter circuit connected to each of the multiple receivers RX arranged parallel in the second axial direction. Furthermore, external noise can be generated in the display device 10 in the first axial direction. External noise can be compensated by sensing the self-capacitance in the multiple drive electrodes TE arranged in the first axial direction.

[0049] Figure 1 The transmitter TX (which is connected to each of the plurality of drive electrodes TE) can be switched on or off depending on the expansion or contraction (e.g., winding or unwinding) of the fixed screen panel 210 and the variable screen panel 220. For example, when the variable screen panel 220 is wound up as the reel 200 slides in a first axial direction (e.g., the negative Y-axis direction), at least one transmitter TX connected to the wound area of ​​the variable screen panel 220 can be switched off.

[0050] Figure 3 This is a block diagram of a display device 30 according to an example embodiment.

[0051] Reference Figure 3 The display device 30 may include a touch panel 300, a display panel 310, a touch driving circuit 320, and a display driving circuit 360.

[0052] The display panel 310 may include multiple source lines SL and multiple gate lines GL intersecting the multiple source lines SL. For example, the multiple gate lines GL may extend in a first axial direction (e.g., the Y-axis direction), and the multiple source lines SL may extend in a second axial direction (e.g., the X-axis direction).

[0053] The display driver circuit 360 may include a source driver 370, a gate driver 380, and a timing controller (TCON) 390. The timing controller 390 can convert data signals input from a host (not shown) and provide the converted data signals to the source driver 370 and the gate driver 380. The timing controller 390 can also provide timing signals or control signals indicating the operating timing to the source driver 370 and the gate driver 380.

[0054] Touch panel 300 can be stacked on display panel 310. In this case, display noise can be introduced into the sensing signal output from touch panel 300. For example, multiple source amplifiers SA can apply source voltages to multiple source lines SL in response to a horizontal synchronization signal received from timing controller 390. Noise generated when the source voltage is applied can be generated in the second axial direction where the multiple source lines SL are arranged.

[0055] The touch panel 300 may include a plurality of receiving electrodes RE arranged in parallel along a second axis.

[0056] The receiving circuit 340 (e.g., in the touch driving circuit 320) may include a plurality of receivers RX, each of which may receive a sensing signal from a corresponding receiving electrode among a plurality of receiving electrodes RE. Each of the plurality of receivers RX may include filter circuitry for removing display noise from the sensing signal. For example, the filter circuitry may filter out a specific level of display noise from the sensing signal received by the corresponding receiving electrode and may convert the filtered signal into an analog signal.

[0057] The transmitting circuit 330 (e.g., in the touch driving circuit 320) may include a plurality of transmitters TX, each of which may be connected to each of a plurality of driving electrodes TE. In some embodiments, only a portion of the plurality of driving electrodes TE may be driven by a portion of the plurality of transmitters TX. Therefore, at least one driving electrode may be undriven and may be used to sense noise. The at least one driving electrode may be referred to as an antenna. Display noise included in the signal received through the plurality of receiving electrodes RE can be removed based on the noise sensed by the antenna. Therefore, the signal-to-noise ratio can be improved.

[0058] Figure 4 This is a diagram illustrating a display device 40 according to an example embodiment. Figure 4 In the figure, curve 50 represents the self-capacitance sensed by multiple driving electrodes TE.

[0059] Reference Figure 4 The display device 40 may include a touch screen panel, a fixed screen panel 410, a variable screen panel 420, and a scroll 400.

[0060] Figure 4 The touch screen panel of the display device 40 shown may include a fixed screen panel 410 and a variable screen panel 420, or the touch screen panel of the display device 40 may include only, for example, the variable screen panel 420.

[0061] The fixed screen panel 410 and the variable screen panel 420 may include a plurality of electrodes (e.g., a plurality of receiving electrodes RE and a plurality of driving electrodes TE) that intersect each other in a matrix.

[0062] Multiple receiving electrodes RE can extend in the sliding direction of the reel 400. For example, multiple receiving electrodes RE can extend in a first axial direction (e.g., the Y-axis direction) and can be arranged in parallel in a second axial direction (e.g., the X-axis direction) perpendicular to the first axial direction.

[0063] Multiple drive electrodes TE may intersect with multiple receive electrodes RE and may extend in a direction perpendicular to the sliding direction of the reel 400. For example, each of the multiple drive electrodes TE may extend in a second axial direction and may be arranged parallel to each other in the first axial direction. The multiple drive electrodes TE may be provided in as many numbers as possible to fit an area of ​​the scalable, variable screen panel 420.

[0064] When a conductive object FG (e.g., a human finger) touches the touchscreen panels of the fixed screen panel 410 and the variable screen panel 420, a touch area 430 can be generated. Furthermore, external noise can be applied by the conductive object FG to a wider area than the touch area 430. For example, external noise can be formed in a rectangular area 440 along a first axial direction (e.g., the Y-axis direction) where multiple receiving electrodes RE extend. The sensing signals output from the touchscreen panels of the fixed screen panel 410 and the variable screen panel 420 can be distorted by external noise.

[0065] The display device 40 can sense the self-capacitance formed in the first axial direction by arranging multiple driving electrodes TE side by side.

[0066] exist Figure 4 In the diagram, curve 50 represents the self-capacitance sensed by the multiple driving electrodes TE. The self-capacitance value can be sensitively sensed in the area where the multiple driving electrodes TE overlap with the touch area 430. The display device 40 can correct for external noise formed in the rectangular area 440 based on the sensing of the self-capacitance formed in the first axial direction.

[0067] Figure 5 This is a block diagram of a display device 60 according to an example embodiment.

[0068] Reference Figure 5 The display device 60 may include a touch panel 600 and a touch driving circuit 620.

[0069] The touch panel 600 can output a sensing signal according to a capacitive sensing method. The touch panel 600 may include multiple driving electrodes TE to which a driving signal is applied and multiple receiving electrodes RE to which the sensing signal is output.

[0070] Multiple receiving electrodes RE can extend in a first axial direction (e.g., the Y-axis direction) and can be arranged in parallel in a second axial direction (e.g., the X-axis direction) perpendicular to the first axial direction.

[0071] Multiple driving electrodes TE can extend in the second axial direction and can be arranged in parallel in the first axial direction.

[0072] Multiple driving electrodes TE can intersect with multiple receiving electrodes RE to form a sensing node. When a driving signal is applied to the multiple driving electrodes TE, charge coupling occurs with the multiple receiving electrodes RE to form mutual capacitance C. M When a conductive object, such as a human finger or stylus, touches or is near a sensing node, charge sharing can occur between the sensing node and the conductive object, thereby changing the mutual capacitance C. M The strength of the sensed signal output to the receiving circuit 640 through multiple receiving electrodes RE can be determined based on the altered mutual capacitance C. M And it can change. For example, the level of the sensing signal can be reduced compared to the state before the touch occurred.

[0073] A self-capacitance C can be formed between each of the multiple drive electrodes TE to which a drive signal is applied and the ground plane. S When a conductive object touches or is near the driving electrode TE, the self-capacitance C S It can be changed relative to the ground plane. The intensity of the sensing signal output to the drive circuit 630 through multiple drive electrodes TE can be adjusted according to the changed self-capacitance C. S And it can change. For example, the level of the sensing signal can be increased compared to the state before the touch occurred.

[0074] Touch panel 600 can sense the mutual capacitance C formed in multiple sensing nodes. M It can also output a first sensing signal. (See above for reference.) Figure 4 As described, external noise generated in the direction in which the multiple receiving electrodes RE extend (e.g., the Y-axis direction) can be added to the first sensing signal. The touch panel 600 can sense the self-capacitance C between each of the multiple driving electrodes TE and the ground plane. S The second sensing signal is output. The second sensing signal may represent the capacitance that changes in the direction in which the multiple receiving electrodes RE extend (e.g., the Y-axis direction). The touch driving circuit 620 may compensate for external noise based on the signal obtained by adding the first sensing signal to the second sensing signal, and may calculate the touch coordinates that generate the input to the touch panel 600.

[0075] Figure 6This is a flowchart illustrating an operation method of a touch controller according to an example embodiment. (Refer to...) Figure 5 describe Figure 6 .

[0076] Reference Figure 6 In operation S110, the touch controller 650 can apply drive signals to the multiple drive electrodes TE of the touch panel 600.

[0077] In operation S120, the touch controller 650 can receive a first sensing signal through multiple receiving electrodes RE. The first sensing signal may be a mutual capacitance C formed at the sensing node where the multiple driving electrodes TE intersect with the multiple receiving electrodes RE. M The first sensing signal can be distorted due to external noise generated in the direction in which the multiple receiving electrodes RE are arranged (e.g., the Y-axis direction).

[0078] In operation S130, the touch controller 650 can receive a second sensing signal via multiple driving electrodes TE. The second sensing signal can be a self-capacitance C formed between the multiple driving electrodes TE and the ground plane. s The signal. The second sensing signal can be used to detect the self-capacitance C. s Signals that change the orientation of multiple receiving electrodes RE.

[0079] In operation S140, the touch controller 650 can compensate the first sensing signal based on the second sensing signal. For example, the touch controller 650 can sum the first sensing signal and the second sensing signal. The signal obtained by summing can be a signal in the first sensing signal that has been compensated for external noise.

[0080] In operation S150, the touch controller 650 can calculate touch coordinates based on the compensated signal. For example, the touch controller 650 can calculate touch coordinates with high accuracy based on the signal obtained by summing the first sensing signal and the second sensing signal.

[0081] Figure 7 This is a diagram illustrating a display device 70 according to an example embodiment.

[0082] Reference Figure 7 The display device 70 can expand or contract as the scroll 700 slides in the first axial direction (e.g., the Y-axis direction).

[0083] The scroll bar 700 can be located on one side of the display device 70, and the display driving circuit (DDI) 720 and the touch driving circuit (touch IC) 730 can be located in the area opposite to the scroll bar 700. The area opposite to the scroll bar 700 is a non-sliding area, which can prevent the display driving circuit 720 and the touch driving circuit 730 from being damaged by sliding.

[0084] The display driver circuit 720 can be mounted on an extension of the touchscreen panel 710, for example, using a chip-on-film method.

[0085] The touch driver circuit 730 can be mounted on a flexible printed circuit board (PCB) 740. Although Figure 7 Not shown, but the memory can also be mounted on the flexible PCB 740 to store commands sent from the host to the touch driver circuit 730.

[0086] The flexible PCB 740 can be located on the front or rear side of the display device 70.

[0087] Figure 8 This is a flowchart illustrating an operation method of a touch controller according to an example embodiment. (Refer to...) Figure 7 describe Figure 8 .

[0088] Reference Figure 8 In operation S160, the touch controller in the touch drive circuit 730 can periodically receive sensed values ​​from the touchscreen panel 710 even when there is no touch input. When the touchscreen panel 710 is rolled up or unrolled, the capacitance value sensed by the touchscreen panel 710 in the absence of touch input can change. For example, when the touchscreen panel 710 is rolled up, the memory, motherboard, battery, etc., mounted on the display device 70 will be in close contact with each other, thus increasing the ambient temperature of the touchscreen panel 710. On the other hand, when the touchscreen panel 710 is unrolled, the ambient temperature can change due to residual heat in the touchscreen panel 710, or it can decrease due to rapid cooling. Depending on the change in ambient temperature, deviations or errors may occur in the values ​​sensed by each of the sensing nodes.

[0089] In operation S170, the touch controller in the touch driving circuit 730 can perform environmental compensation based on the sensing values ​​received in operation S160. The touch controller can compensate for noise from the sensing values ​​and adjust the sensing values ​​to a uniform reference value. When a touch input is applied to the touch screen panel 710, the touch screen panel 710 can output a sensing value that has changed from the reference value, thus preventing a decrease in touch sensing sensitivity due to changes in the shape of the display device 70.

[0090] Figure 9 This is a diagram illustrating a display device 80 according to an example embodiment.

[0091] Reference Figure 9The display device 80 can expand or contract as the scroll 800 slides in a second axial direction (e.g., the X-axis direction). The display device 80 may include a plurality of driving electrodes TE, each extending in a first axial direction (e.g., the Y-axis direction) and arranged parallel to each other in a second axial direction (e.g., the X-axis direction) perpendicular to the first axial direction (e.g., the Y-axis direction). The display device 80 may include a plurality of receiving electrodes RE, extending in a second axial direction and arranged parallel to each other in the first axial direction. Mutual capacitance C can be formed in a plurality of sensing nodes where the plurality of driving electrodes TE and the plurality of receiving electrodes RE intersect. M Furthermore, a self-capacitance C can be formed between each of the multiple driving electrodes TE and the ground plane. S .

[0092] The scroll bar 800 can be located on one side of the display device 80, and the display driving circuit 820 and the touch driving circuit 830 can be located in the area opposite to the scroll bar 800. The area opposite to the scroll bar 800 is a non-sliding area, which can prevent the display driving circuit 820 and the touch driving circuit 830 from being damaged by sliding.

[0093] The display driver circuit 820 can be mounted on an extended portion of the touchscreen panel 810 using a chip-on-film method.

[0094] The touch driver circuit 830 can be mounted on the flexible PCB 840. Although Figure 9 Although not shown, a memory can also be installed on the flexible PCB 840 to store commands sent from the host to the touch driver circuit 830.

[0095] For example, the flexible PCB 840 can be located on the front or rear side of the display device 80.

[0096] Figure 10 This is a diagram illustrating a display device 90 according to an example embodiment.

[0097] Reference Figure 10 The display device 90 can expand or shrink as the reel 900 slides along a second axis direction (e.g., the X-axis direction). The display device 90 may include multiple reels (e.g., a first reel 900 and a second reel 910). The first reel 900 and the second reel 910 may be arranged parallel to the first axis direction (e.g., the Y-axis direction). The display device 90 can expand when the first reel 900 and the second reel 910 slide away from each other. For example, the first reel 900 may slide in the positive direction of the second axis (e.g., the positive X-axis direction), and the second reel 910 may slide in the negative direction of the second axis (e.g., the negative X-axis direction).

[0098] Mutual capacitance C can be formed in multiple sensing nodes where multiple driving electrodes TE and multiple receiving electrodes RE intersect. M Furthermore, a self-capacitance C can be formed between each of the multiple driving electrodes TE and the ground plane. S .

[0099] The display driver circuit 920 and the touch controller 930 can be mounted on the flexible PCB 940 and on the front or rear side of the display device 90. The display driver circuit 920 and the touch controller 930 can be arranged parallel to a second axis direction (e.g., the X-axis direction) perpendicular to the first axis direction (e.g., the Y-axis direction).

[0100] Figure 11 This is a block diagram of a touchscreen system 1000 according to an example embodiment.

[0101] Reference Figure 11 The touch screen system 1000 may include a touch screen driver circuit 1100 and a host (AP) 1200.

[0102] The touchscreen driver circuit 1100 can be integrated into a single semiconductor chip and can be referred to as a Touch Display Driver Circuit (TDDI). The touchscreen driver circuit 1100 may include a gate driver 1001, a source driver 1002, a timing controller (TCON) 1003, a touch processor 1004, a static random access memory (SRAM) 1005, and a TX driver 1006, which can be integrated into one or more separate semiconductor chips.

[0103] The host 1200 can perform overall control operations of the touch screen system 1000. As an example, the host 1200 can generate data IDT related to display operations and provide the data IDT to the touch screen driver circuit 1100, or it can receive touch recognition results (e.g., whether a touch has occurred and touch coordinates Txy) and perform various control operations using the received touch recognition results.

[0104] As an implementation example, host 1200 may include an application processor, which may be implemented as a system-on-a-chip (SoC). The SoC may include a system bus (not shown) that applies a protocol with a specific standard bus specification, and may include various intellectual property (IP) connected to the system bus.

[0105] In summary, display devices can be formed on flexible plastic substrates, thus allowing the shape of the touchscreen panel to be freely changed, such as by folding or rolling. However, noise is introduced into the touch sensing signal and changes depending on the shape of the touchscreen panel, potentially reducing touch sensing sensitivity.

[0106] As described above, the embodiments may provide a structure for a touch screen panel for reducing noise and a display device including the structure, wherein the noise can be changed as the touch screen panel is rolled up or unfolded.

[0107] Exemplary embodiments have been disclosed herein, and although specific terminology has been used, it is intended to be used and interpreted in a general and descriptive sense only and not for limiting purposes. In some instances, as will be apparent to those skilled in the art up to the time of filing of this application, features, characteristics, and / or elements described in connection with particular embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise specifically indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A display device, comprising: A touch screen panel having a fixed screen panel and a variable screen panel, the touch screen panel including a touch panel and a display panel stacked below the touch panel; Touch driving circuit; as well as One or more reels, around which the variable screen panel is wound, such that while the fixed screen panel remains fixed, the variable screen panel can be expanded and contracted, wherein: The touch panel includes multiple receiving electrodes and multiple driving electrodes. The multiple receiving electrodes extend in a first axial direction and are arranged parallel to each other in a second axial direction perpendicular to the first axial direction. The multiple driving electrodes extend in the second axial direction and are arranged parallel to each other in the first axial direction. The display panel includes multiple gate lines and multiple source lines intersecting with the multiple gate lines. The touch driving circuit is configured to apply multiple driving signals to the plurality of driving electrodes, and The variable screen panel, wound on the one or more spools, unfolds as the one or more spools slide in the direction of the first axis.

2. The display device according to claim 1, wherein, The multiple source lines extend on the display panel in the second axial direction and are arranged parallel to each other in the first axial direction.

3. The display device according to claim 1, wherein: The touch panel is configured to output a first sensing signal, which is used to sense the mutual capacitance formed at sensing nodes where the plurality of receiving electrodes intersect with the plurality of driving electrodes. The touch panel is configured to output a second sensing signal for sensing the self-capacitance formed between the plurality of driving electrodes and the ground plane.

4. The display device according to claim 3, wherein, The touch driving circuit includes a touch controller configured to calculate touch coordinates based on a signal obtained by adding the first sensing signal to the second sensing signal, at which input to the touch panel is generated.

5. The display device according to claim 3, wherein, The touch driving circuit includes a touch controller configured to compensate for external noise generated in the first sensing signal in the first axial direction based on the second sensing signal.

6. The display device according to claim 1, wherein: The touch driving circuit includes a transmitting circuit connected to the plurality of driving electrodes, and The plurality of driving electrodes includes at least one driving electrode, which is used to sense noise caused by the driving of the display panel when the at least one driving electrode is not driven by the transmitting circuit.

7. The display device according to claim 6, wherein, The touch drive circuit is also configured to deactivate at least one transmitter connected to the wound touch panel area when the touch screen panel is wound as the one or more spools slide in the first axial direction.

8. The display device according to claim 1, wherein, The touch driving circuit includes a receiving circuit connected to the plurality of receiving electrodes. The receiving circuit includes a plurality of receivers, each of which is configured to receive a sensing signal from a corresponding one of the plurality of receiving electrodes, and includes a filter circuit for removing display noise from the sensing signal.

9. The display device according to claim 1, wherein, The total number of the plurality of driving electrodes is determined based on the area of ​​the touchscreen panel extending in the first axial direction.

10. The display device according to claim 1, wherein, The touch driving circuit is opposite to the one or more reels.

11. A display device, comprising: A touch screen panel having a fixed screen panel and a variable screen panel, the touch screen panel including a touch panel and a display panel stacked below the touch panel; as well as Multiple spools are wound around the variable screen panel, such that while the fixed screen panel remains fixed, the variable screen panel can be expanded and contracted, wherein: The touch panel includes multiple receiving electrodes and multiple driving electrodes. The multiple receiving electrodes extend in a first axial direction and are arranged parallel to each other in a second axial direction perpendicular to the first axial direction. The multiple driving electrodes extend in the second axial direction and are arranged parallel to each other in the first axial direction. The display panel includes multiple gate lines extending in the first axial direction and multiple source lines extending in the second axial direction, and The variable screen panel is expanded as the plurality of scrolls slide in opposite directions along the first axis.

12. The display device according to claim 11, further comprising: The display driving circuit is configured to apply driving signals to the plurality of gate lines and the plurality of source lines respectively; as well as A touch driving circuit configured to apply a driving voltage to the plurality of driving electrodes.

13. The display device according to claim 12, wherein: The plurality of spools are arranged parallel to each other along the first axial direction, and The display driving circuit and the touch driving circuit are arranged in parallel along the second axis.

14. The display device according to claim 12, wherein, The display driver circuit and the touch driver circuit are mounted in a single semiconductor chip.

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