Touch screen module with higher touch sensitivity and lower sensitivity deviation

Abstract

The present invention provides a touch screen module having higher touch sensitivity and lower sensitivity deviation. The touch screen module is provided for solving the problems existing in an existing touch screen module, coupling capacitance generated between the display driving element and the display driving signal line is avoided, and meanwhile the touch sensitivity deviation caused by the length difference of the sensor signal line is reduced. According to the touch screen module capable of improving the touch sensitivity and reducing the sensitivity deviation, the sensitivity deviation can be compensated by adjusting the length of a touch sensor signal line in a printed circuit board (PCB) or a flexible printed circuit board (FPCB) area; and coupling noise generated by extension in the display driving signal line and the touch sensor signal line is prevented through the shielding plate.

Description

Technical Field

[0001] This invention relates to a touch screen module, and more particularly to a touch screen module that can prevent coupling capacitance between the display driving element and the display driving signal line, while reducing touch sensitivity deviation caused by differences in sensor signal line length. Background Technology

[0002] Generally speaking, a touchpad is an input device formed on or coupled to a display device (such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic light-emitting diode (OLED) display, an active-matrix organic light-emitting diode (AMOLED) display, etc.) to generate a position signal corresponding to the position of an object (such as a finger or pen) touching the touchpad. Such touchpads have a wide range of applications, including small mobile terminals, industrial terminals, and digital information devices (DIDs), and are expanding into various application areas.

[0003] A capacitive touchscreen is a device that determines whether a touch has occurred by measuring the change in electrical signal generated by the capacitance between the touch pattern on the touchscreen and a human finger or a touch input tool with similar conductive properties.

[0004] The touchscreen module 100 includes a touchpad 110, which includes a plurality of touch sensors 150 and a printed circuit board (PCB) or flexible printed circuit board (FPCB) area 140 on which touch integrated circuits 190 are mounted.

[0005] Reference Figure 1 Multiple touch sensors 150 are arranged in multiple columns and rows on the touchpad 110 to have a matrix structure.

[0006] The touchpad 110 includes: an active area 120 in which a touch sensor 150 is formed; a fan-out area 130 in which multiple touch sensor signal lines 160 converge to connect to a touch integrated circuit 190; and a bonding area 180 in which the touch sensor signal lines 160 are bonded to an extension 170 of the touch sensor signal lines 160.

[0007] The bonding area 180 may include a multiplexer for multiplexing or deselecting control signals from the touch integrated circuit 190 or touch signals from the touch sensor 150.

[0008] Touch sensor signal lines 160 connected to each touch sensor 150 pass through fan-out area 130 and are bonded to extensions 170 of touch sensor signal lines in bonding area 180 to connect to touch integrated circuit 190 within a printed circuit board (PCB) or flexible printed circuit board (FPCB).

[0009] The touch sensor 150 and touch sensor signal line 160 within the active area 120 have the same shape in each row.

[0010] However, the length differences between the touch sensor signal lines 160 in the fan-out area 130 and the length differences between the extensions 170 of the touch sensor signal lines in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 140 result in differences in the touch signals generated by the touch sensors 150 in the same row. That is, sensitivity deviation occurs.

[0011] To reduce the sensitivity deviation of the touch screen module 100, it is proposed to add a sensitivity compensation signal line or a deviation compensation signal line.

[0012] However, space constraints prevent the addition of sensitivity compensation signal lines or deviation compensation signal lines for improving sensitivity deviation in the touch sensor signal lines 160 in the active area 120 and fan-out area 130.

[0013] Furthermore, since the display device-related components and drive signal lines spatially overlap in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 140 where the touch integrated circuit 190 is mounted, coupling noise between the extension 170 of the touch sensor signal line 160 and the drive signal line of the display device may cause distortion of the touch signal and display signal.

[0014] Therefore, a touchscreen module 100 with higher touch sensitivity and lower sensitivity deviation is needed.

[0015] Existing literature

[0016] Patent Document 1: Patent Registration Publication No. 10-1374312 (June 14, 2014)

[0017] Patent Document 2: Patent Registration Publication No. 10-1609992 (March 31, 2016) Summary of the Invention

[0018] The present invention aims to solve the above-mentioned problems of traditional touch screen modules and provides a touch screen module that can avoid the generation of coupling capacitance between display driving elements and display driving signal lines, while reducing touch sensitivity deviation caused by differences in sensor signal line lengths.

[0019] According to one embodiment of the present invention, a touch screen module includes: a touch panel, the touch panel including a plurality of touch sensors arranged in multiple rows and columns and a plurality of touch sensor signal lines respectively connected to the touch sensors;

[0020] A touch integrated circuit (IC) is connected to the touch sensor via an extension of the touch sensor signal line to control the touch sensing operation of the touch sensor and calculate the touch coordinates of the touch sensor. The touch IC is mounted on a circuit board that contains display drive signal lines and components for cooperating with the touchpad to drive the display device; and

[0021] At least one shielding plate is formed on the circuit board to prevent coupling capacitance between the extension of the display drive signal line and the touch sensor signal line.

[0022] Preferably, the circuit board is a printed circuit board (PCB) or a flexible printed circuit board (FPCB).

[0023] Preferably, the shielding plate comprises:

[0024] A shielding plate formed on the upper part of the extension of the touch sensor signal line; and

[0025] The lower shielding plate is formed below the extension of the touch sensor signal line.

[0026] Preferably, the touch integrated circuit applies a driving signal to at least one of the upper shielding plate and the lower shielding plate to improve the touch sensitivity of the touch sensor.

[0027] Preferably, a compensation zone is formed on the circuit board to compensate for the length difference between touch sensor signal lines connected to the same row of touch sensors.

[0028] Preferably, the compensation interval has a zigzag pattern in at least a segment of the extension of at least one touch sensor signal line so that the lengths of touch sensor signal lines with different lengths are equal.

[0029] Preferably, the compensation interval is located between the upper shielding plate and the lower shielding plate.

[0030] Preferably, the zigzag pattern segments extending from the touch sensor signal line change according to the location of the touch integrated circuit.

[0031] Preferably, a driving voltage is applied to at least one of the upper shielding plate and the lower shielding plate to improve the sensitivity of the touch sensor by increasing the capacitance between the touch sensor signal line and the shielding plate.

[0032] According to the present invention, a touch screen module with higher touch sensitivity and lower sensitivity deviation can be provided, which can improve the sensitivity of the touch sensor without changing the touch screen structure.

[0033] This invention provides a touchscreen module that improves touch sensitivity and reduces sensitivity deviation. It compensates for sensitivity deviation by adjusting the length of the touch sensor signal lines in a printed circuit board (PCB) or flexible printed circuit board (FPCB), and can prevent coupling noise between the display drive signal lines and the extended touch sensor signal lines by using a shielding plate. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a touchscreen module.

[0035] Figure 2a This is a view of a shielding plate formed in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area of ​​a touch screen module having higher touch sensitivity and lower sensitivity deviation according to the present invention.

[0036] Figure 2b for Figure 2a The side view shows the arrangement of the touch sensor signal lines and the shielding plate.

[0037] Figure 3 This is a plan view of the printed circuit board (PCB) or flexible printed circuit board (FPCB) area of ​​a touch screen module having higher touch sensitivity and lower sensitivity deviation according to another embodiment of the present invention.

[0038] Figure 4 This is a plan view of the printed circuit board (PCB) or flexible printed circuit board (FPCB) area of ​​a touch screen module having higher touch sensitivity and lower sensitivity deviation according to another embodiment of the present invention. Detailed Implementation

[0039] The invention will now be described in detail with reference to exemplary embodiments thereof, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0040] Figure 2a This is a view of a shielding plate formed in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area of ​​a touch screen module having higher touch sensitivity and lower sensitivity deviation according to the present invention.

[0041] The touchscreen module according to an embodiment of the present invention has the same characteristics as... Figure 1 The touchscreen module 100 shown has the same structure. Therefore, the touchscreen module 100 according to the present invention includes a touchpad 110 and a printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240.

[0042] This invention achieves improved touch sensitivity without requiring any structural changes to the touchpad 110. As mentioned above, space constraints hinder... Figure 1 A compensation signal line is added to the touchpad 110 of the touchscreen module 100 shown. This invention provides a solution to this problem.

[0043] Figure 2a Is with Figure 1 An enlarged view of the changed portion of the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240 compared to the touch screen module 100.

[0044] The touch screen module according to the present invention includes a touch panel 110 having a plurality of touch sensors 150 arranged in multiple rows and columns and a plurality of touch sensor signal lines 160 respectively connected to the touch sensors 150, and a printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240 on which a touch integrated circuit 290 is mounted.

[0045] The touch integrated circuit 290 is connected to the touch sensor 150 via an extension 270 of the touch sensor signal line 160 to control the touch sensing operation of the touch sensor 150 and calculate the touch coordinates of the touch sensor 150.

[0046] On the circuit board on which the touch integrated circuit 290 is mounted, there are display drive signal lines and components for cooperating with the touch panel 110 to drive the display device.

[0047] although Figure 2a The components for driving the display device and the display drive signal line are not specifically shown, but the extensions of the display drive signal line and the touch sensor signal line 270 may overlap each other in space.

[0048] The coupling capacitance generated by the spatial overlap between the extension 270 of the display drive signal line and the touch sensor signal line becomes noise in the touch signal, thereby reducing the signal-to-noise ratio (SNR).

[0049] To address this issue, the touchscreen module 100 according to the present invention includes at least one shielding plate 210 in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240.

[0050] A shielding plate 210 is formed on the circuit board to prevent coupling capacitance between the extension 270 of the display drive signal line and the touch sensor signal line.

[0051] As used in this article, "circuit board" can refer to a printed circuit board (PCB) or a flexible printed circuit board (FPCB).

[0052] Figure 2b for Figure 2aThe side view shows the arrangement of the touch sensor signal lines and the shielding plate.

[0053] Figure 2b It is along Figure 2a The side view is taken by line A-A'.

[0054] like Figure 2b As shown, the shielding plate 210 formed in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240 includes an upper shielding plate 211 formed on the extension 270 of the touch sensor signal line in the touch sensor signal line extension plate 271 and a lower shielding plate 212 formed below the extension 270 of the touch sensor signal line.

[0055] In one embodiment, the touch integrated circuit 290 may apply a drive signal to at least one of the upper shielding plate 211 and the lower shielding plate 212 to improve the touch sensitivity of the touch sensor 150. The drive signal may be a voltage (square wave) that swings from a drive voltage to ground voltage or a voltage applied as a DC voltage.

[0056] In reference Figure 2a and Figure 2b In the described embodiment, in the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240 where the touch integrated circuit 290 is mounted, shielding plates are formed on the upper and lower layers of the extension 270 of the touch sensor signal line, connecting the touch integrated circuit 290 to the touch sensor 150, and applying driving signals to the shielding plates 211 and 212 formed on the upper and lower layers of the extension 270 of the touch sensor signal line to improve touch sensitivity.

[0057] Figure 3 This is a plan view of a printed circuit board (PCB) or flexible printed circuit board (FPCB) of a touch screen module having higher touch sensitivity and lower sensitivity deviation according to another embodiment of the present invention.

[0058] As described above, due to the difference in length between the touch sensor signal lines 160 within the fan-out area 130 and between the touch sensor signal lines within the printed circuit board (PCB) or the extensions 170 in the flexible printed circuit board (FPCB) area, a sensitivity deviation will occur between the touch sensors 150 in the same row of the touch screen module.

[0059] The length difference between the touch sensor signal lines within the touchpad 110 or the length difference between the sensor signal line extensions 270 within the printed circuit board (PCB) or flexible printed circuit board (FPCB) area 240 causes differences in resistance and capacitance between the sensor signal lines, resulting in deviations in touch sensitivity.

[0060] To address this issue, the touchscreen module according to the present invention includes compensation intervals 310-1 and 310-2 to compensate for the length difference between the touch sensor signal lines and the touch sensors connected in the same row on the circuit board.

[0061] In one embodiment, compensation intervals 310-1 and 310-2 have a zigzag pattern in at least one extension 270 of at least one touch sensor signal line to make the lengths of touch sensor signal lines with different lengths equal.

[0062] In one embodiment, compensation intervals 310-1 and 310-2 are formed between the upper shielding plate 211 and the lower shielding plate 212.

[0063] In one embodiment, a drive signal is applied to at least one of the upper shielding plate 211 and the lower shielding plate 212 to increase the capacitance between the extension 270 of the touch sensor signal line and the shielding plate 210, thereby improving the touch sensitivity of the touch sensor 150.

[0064] Figure 4 This is a plan view of a printed circuit board (PCB) or flexible printed circuit board (FPCB) of a touch screen module having higher touch sensitivity and lower sensitivity deviation according to another embodiment of the present invention.

[0065] Figure 4 It shows Figure 3 The compensation interval shown is modified, wherein the position of the compensation interval changes due to the change in the position of the touch integrated circuit 290.

[0066] In one embodiment, the compensation interval 410, which includes the zigzag pattern segment of the extension 270 of the touch sensor signal line, specifically compensation interval 410-1, compensation interval 410-2, and compensation interval 410-3, varies depending on the position of the touch integrated circuit 290.

[0067] and Figure 3 In comparison, you can see Figure 4 The compensation interval shown is divided into multiple segments because the touch integrated circuit 290 is located near the center.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A touch screen module, characterized by, The touch panel includes a plurality of touch sensors arranged in a plurality of rows and a plurality of columns, and a plurality of touch sensor signal lines connected to the touch sensors, respectively; a touch integrated circuit connected to the touch sensors through extensions of the touch sensor signal lines to control touch sensing operations of the touch sensors and to calculate touch coordinates of the touch sensors - the touch integrated circuit is mounted on a circuit board on which display driving signal lines and components for driving a display device in cooperation with the touch panel are disposed; and at least one shield plate is formed on the circuit board to prevent coupling capacitance between the display driving signal lines and the extensions of the touch sensor signal lines. The circuit board is a printed circuit board or a flexible printed circuit board.

2. The touch screen module of claim 1, wherein, The shield plate includes:

3. The touch screen module of claim 1, wherein, a shield plate formed on an upper portion of the extensions of the touch sensor signal lines; and a shield plate formed on a lower portion formed below the extensions of the touch sensor signal lines. The touch integrated circuit applies a driving signal to at least one of the shield plate of the upper portion and the shield plate of the lower portion to improve touch sensitivity of the touch sensors.

4. The touch screen module of claim 3, wherein, A compensation interval is formed on the circuit board to compensate for a length difference between the touch sensor signal lines connected to the touch sensors of the same row.

5. The touch screen module of claim 3, wherein, The compensation interval has a zigzag pattern in at least one section of the extensions of at least one of the touch sensor signal lines to equalize lengths of the touch sensor signal lines having different lengths.

6. The touch screen module of claim 5, wherein, The compensation interval is disposed between the shield plate of the upper portion and the shield plate of the lower portion.

7. The touch screen module of claim 6, wherein, The zigzag pattern section of the extensions of the touch sensor signal lines is changed according to a position of the touch integrated circuit.

8. The touch screen module of claim 6, wherein, A driving voltage is applied to at least one of the shield plate of the upper portion and the shield plate of the lower portion to improve sensitivity of the touch sensors by increasing capacitance between the touch sensor signal lines and the shield plate.

9. The touch screen module of claim 4, wherein, ​

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