Pure pressure touch module display screen

Abstract

A pure pressure touch module display screen comprises a liquid crystal display module, a middle frame and a back frame, the liquid crystal display module comprises a cover plate, the cover plate is optically attached to a TFT panel through optical glue, and a backlight source is arranged below the TFT panel; the liquid crystal display module is nested on the upper side of the middle frame, and a sectional foam rubber layer is arranged between the liquid crystal display module and the middle frame; a touch module is arranged on the lower side of the middle frame, the liquid crystal display module and the touch module are connected through a connector, and a rubber column is further arranged between the liquid crystal display module and the touch module; the touch module comprises a PCB (Printed Circuit Board), a touch IC (Integrated Circuit) chip is welded on the lower side of the PCB, the PCB is attached to an iron bracket through a double-sided adhesive tape, an opening for highlighting the touch IC chip is reserved at the joint of the iron bracket and the touch IC chip, and a connector is welded on the back surface of the PCB; according to the device, smooth touch screen control can be achieved under the condition that the surface of the screen is provided with water, the device is not affected by conductive liquid on the touch surface, control can be conducted when a human body wears thick gloves, and a blind visual angle mark touch control mode is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of touch control, in particular to a pure pressure touch control module display screen. Background Art

[0002] Capacitive touch modules have become a very mature technology for current touch screens. Their working principle is to use human body current induction to work. When a conductive object touches the screen, the capacitance of the contact point will change, thereby detecting the touch position. They are now widely used in electronic display screens in consumer digital, automotive, industrial and other industries. However, when there is water or other conductive liquids on the surface of the capacitive touch screen, the water or other conductive liquids will affect the touch experience and change the capacitance of the contact points in the area, making it difficult to obtain effective input, and thus the device may not be controlled. It is more likely that the internal sensor capacitor will mistakenly regard the water as the user's finger and report to the system to perform unexpected operations, causing false touches. In the winter in the north, users may wear thick gloves to operate the touch screen, which will also affect the touch effect of the capacitive touch module to a greater extent, causing the touch to fail.

[0003] With the rapid development of touch display technology and its wide application in life, capacitive touch modules can no longer meet the needs of today's users. Users have raised new challenges to the applicability, reliability and safety of touch screens. It is necessary to develop a touch module that can avoid false touches or touch failures when conductive liquid is present on the touch screen, and can also achieve touch operations when wearing other items on the hand. Utility Model Content

[0004] In order to solve the touch problems such as accidental mis-touch and ineffective touch caused by water or other conductive liquids on the surface of the capacitive touch module and the influence of thick gloves on the touch screen, the utility model provides a pure pressure touch module display screen. The pure pressure touch module is a touch module specially designed for humid, chaotic and complex environments, aiming to overcome the current capacitive touch screen cannot be smoothly operated or misidentified when the screen is wet, and has the characteristics of wide applicability, strong safety and high stability. The utility model is achieved through the following technical solutions:

[0005] A pure pressure touch module display screen comprises a liquid crystal display module, a middle frame and a back frame, wherein the liquid crystal display module comprises a cover plate, the cover plate is optically bonded to a TFT panel by optical glue, and a backlight source is arranged under the TFT panel; the liquid crystal display module is nested on the upper side of the middle frame, and a segmented foam adhesive layer is arranged between the liquid crystal display module and the middle frame; a touch module is arranged on the lower side of the middle frame, and the liquid crystal display module and the touch module are connected by a connector; the touch module comprises a PCB board, a touch IC chip is welded on the lower side of the PCB board, the PCB board is bonded to an iron bracket by double-sided adhesive, an opening for highlighting the touch IC chip is reserved at the junction of the iron bracket and the touch IC chip, and a screw nut is arranged on the lower side of the iron bracket; a rubber column is also arranged between the liquid crystal display module and the touch module, the back frame is fixed on the middle frame, and the connector is welded on the back side of the PCB board.

[0006] Preferably, the middle frame is a U-shaped structure, and is provided with slots on both upper and lower sides, and the slots are used to accommodate the liquid crystal display module and the touch control module.

[0007] Preferably, the optical glue is OCA optical glue, and the thickness of the glue layer formed by the OCA optical glue is 0.4 mm.

[0008] Preferably, 4 groups of rubber columns are provided, and the height of the rubber columns is 4 mm, the length is 8 mm, and the width is 4 mm.

[0009] Preferably, the rubber column is bonded to the touch module and the liquid crystal display module by double-sided tape.

[0010] Preferably, the number of the touch IC chips is set to 4, and the touch IC chips are arranged at four corners of the touch module and are symmetrically arranged vertically, horizontally and horizontally.

[0011] Preferably, the back frame is fixed to the screw nut on the lower side of the iron bracket by screws to achieve a close fit between the back frame and the middle frame.

[0012] Preferably, two groups of U-shaped grooves are provided on each side of the iron bracket and the PCB board, and the groove positions are kept consistent.

[0013] Preferably, the upper side of the rubber column contacts the backlight source, the lower side of the rubber column contacts the PCB board, and the lower side of the rubber column is arranged at four corners of the PCB board.

[0014] Preferably, the thickness of the segmented foam adhesive layer is 0.6 mm, and the thickness of the cover plate is 1.1 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. This practical product has a wide range of applicability, high stability and strong safety. It can be used in buses, trucks, motorcycles, etc. It overcomes the problem that the current touch screen cannot operate smoothly or misidentifies the wrong jump point when the screen is wet;

[0017] 2. The utility model achieves the touch effect by transmitting signals according to the pressure sensing principle. Its structural composition is very different from the current touch screen. It senses the strength of the finger pressing the screen through the touch IC chip, thereby determining the pressing position for control output. Compared with the current capacitive touch module which uses the human body's current sensing to work, the utility model can still be used normally even in rainy days or in extremely humid environments. That is, the screen can achieve smooth touch screen control when there is water on the screen surface, and will not be affected by any liquid on the touch surface. When the human body wears gloves, it is not affected by the thickness and is not limited to the touch of conductive objects. It can complete the control and has a blind visual angle marking touch mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0019] In the figure: 1. Cover plate; 2. Optical glue; 3. TFT panel; 4. Backlight source; 5. Foam adhesive layer; 6. Middle frame; 7. Rubber column; 8. PCB board; 9. Double-sided tape; 10. Iron bracket; 11. Touch IC chip; 12. Back frame; 13. Connector; 14. Screw cap. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0022] Embodiment 1:

[0023] like Figure 1As shown, a pure pressure touch module display screen includes a liquid crystal display module, a middle frame 6 and a back frame 12. The middle frame 6 is a square structure, and grooves are arranged on both the upper and lower sides of the middle frame 6, so as to form a protruding boss part in the middle part. The grooves on the upper and lower sides of the middle frame 6 are used to accommodate the nested liquid crystal display module and the touch module; the liquid crystal display module is nested on the upper side of the middle frame 6, and a segmented foam adhesive layer 5 with a thickness of 0.6 mm is arranged between the two for bonding; wherein, the liquid crystal display module includes a cover plate 1 with a thickness of 1.1 mm, and the cover plate 1 is optically bonded with the TFT panel 3 through optical glue 2, and a backlight source 4 is arranged under the TFT panel 3; on the lower side of the middle frame 6 A touch module is set up, and the touch module includes a PCB board 8. It should be noted that in order to meet the touch needs, corresponding touch components need to be arranged on the PCB board 8 according to actual touch needs to realize touch operation; the PCB board 8 is attached to the iron bracket 10 through a double-sided tape 9 with a thickness of 0.17 mm, and a touch IC chip 11 is welded on the lower side of the PCB board 8, and an opening for highlighting the touch IC chip 11 is reserved at the junction of the iron bracket 10 and the touch IC chip 11, so as to show the touch IC chip 11; the number of touch IC chips 11 used is set to 4, and they are arranged at the four corners of the touch module and are symmetrically arranged up and down and left and right.

[0024] The liquid crystal display module and the touch control module are connected through a connector 13, and a rubber column 7 is also arranged between the liquid crystal display module and the touch control module. The rubber column 7 is provided with 4 groups, and the rubber column preferably has a height of 4mm, a length of 8mm, and a width of 4mm. The height of the rubber column 7 can also be adjusted according to the actual pressing requirements; and the rubber column 7 is bonded to the touch control module and the liquid crystal display module through double-sided adhesive. The rubber column 7 is bonded to the lower side of the backlight source 4, and fits with the backlight source 4 to serve as four pillars supporting the backlight source 4; the lower surface of the rubber column 7 is pasted with double-sided adhesive to connect the PCB board 8, and the lower side of the rubber column 7 is arranged at the four corners of the PCB board 8; so that a gap is formed between the two for setting the connector 13, the connector 13 needs to be welded on the back of the PCB board, and the FPC plug on the TFT panel 3 is plugged into the connector 13; the connector 13 is used to transmit the FPC signal generated by the backlight source 4 and the TFT panel 3 to the PCB board 8.

[0025] The middle frame 6 used in this display screen is a square-shaped structure, and is provided with slots on the upper and lower sides for accommodating the liquid crystal display module and the touch module. The optical glue 2 uses OCA optical glue, and the thickness of the glue layer formed by the OCA optical glue is 0.4mm.

[0026] A screw nut 14 is provided on the lower side of the iron bracket 10, and the back frame 12 is fixed on the middle frame 6; the back frame 12 is fixed to the screw nut 14 on the lower side of the iron bracket 10 by screws to achieve a close fit between the back frame 12 and the middle frame 6, that is, the four sides of the iron bracket 10 are first connected to the middle frame 6 by screws, and the back frame 12 is then connected to the screw nut 14 on the lower side of the iron bracket 10 by screws, so as to achieve a close fit between the back frame 12 and the middle frame 6; the screw specification used is 2.88mm*6mm, and the thickness of the iron bracket 10 is 0.5mm.

[0027] Two sets of U-shaped grooves are provided on each side of the iron bracket 10 and the PCB board 8, and the groove positions are kept consistent. The grooves can play a good role in touch buffering, thereby ensuring the timely touch response of the touch module during the touch process.

[0028] In order to better understand the touch layout of this practical setting, the following explanation is made: in the field of display manufacturing, the AA area is the visible area of ​​the display screen, and the shape of the PCB board must be larger than the AA area. Therefore, the center point of the diagonal line connecting the four touch IC chips of this practical setting is the display center of the AA area, that is, the PCB board used corresponds to the AA area of ​​the liquid crystal display module, and the distribution of the touch IC chips on the PCB board corresponds to the four corners of the AA area.

[0029] After the overall structure of the display screen is assembled, simulation debugging is required. Specifically, the touch IC chip is normally connected to the MCU control unit. After startup, the finger presses any area in the AA area, and the liquid crystal display module is subjected to a downward force. The pressure is transmitted from the finger end to the module side. The farther the finger presses, the smaller the pressure is. Then, the four rubber columns serve as the support of the liquid crystal display module, and the force will be concentrated on the four rubber columns. The rubber columns are located at the end of the U-shaped structure of the PCB board and the iron bracket. The downward force will cause the U-shaped PCB and the iron bracket to produce a certain amount of deformation, so that the pressure value is more easily captured by the touch IC chip, and then the signal amount is transmitted (when not pressed, the micro deformation recovers by itself). Since the four rubber columns are at different distances from the finger pressing, the pressures received are also different, so the signal amounts received by the touch IC chips located at the four corners of the AA area are also different. After the touch IC chip outputs the signal amount to the MCU control unit, the MCU control unit calculates the finger pressing position through an algorithm and simultaneously determines whether it is the signal value of the finger pressing.

[0030] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A pure pressure touch module display screen, characterized in that: It comprises a liquid crystal display module, a middle frame and a back frame, wherein the liquid crystal display module comprises a cover plate, the cover plate is optically bonded to a TFT panel by optical glue, and a backlight source is arranged under the TFT panel; the liquid crystal display module is nested in the upper side of the middle frame, and a segmented foam adhesive layer is arranged between the liquid crystal display module and the middle frame; a touch module is arranged on the lower side of the middle frame, and the liquid crystal display module and the touch module are connected by a connector; the touch module comprises a PCB board, a touch IC chip is welded on the lower side of the PCB board, the PCB board is bonded to an iron bracket by double-sided tape, an opening for highlighting the touch IC chip is reserved at the junction of the iron bracket and the touch IC chip, and a screw nut is arranged on the lower side of the iron bracket; a rubber column is also arranged between the liquid crystal display module and the touch module, the back frame is fixed on the middle frame, and the connector is welded on the back side of the PCB board.

2. A pure pressure touch module display screen according to claim 1, characterized in that: The middle frame is a U-shaped structure, and is provided with slots on both upper and lower sides, and the slots are used to accommodate the liquid crystal display module and the touch control module.

3. The pure pressure touch module display screen according to claim 1, characterized in that: The optical glue adopts OCA optical glue, and the thickness of the glue layer formed by the OCA optical glue is 0.4mm.

4. The pure pressure touch module display screen according to claim 1, characterized in that: The rubber columns are provided in 4 groups, each of which has a height of 4 mm, a length of 8 mm, and a width of 4 mm.

5. The pure pressure touch module display screen according to claim 4, characterized in that: The rubber column is bonded to the touch module and the liquid crystal display module by double-sided adhesive.

6. The pure pressure touch module display screen according to claim 1, characterized in that: The number of the touch IC chips is set to 4, and the touch IC chips are arranged at the four corners of the touch module and are symmetrically arranged up and down and left and right.

7. The pure pressure touch module display screen according to claim 1, characterized in that: The back frame is fixed to the screw nut on the lower side of the iron bracket by screws to achieve close matching between the back frame and the middle frame.

8. The pure pressure touch module display screen according to claim 1, characterized in that: Two groups of U-shaped grooves are arranged on each side of the iron bracket and the PCB board, and the groove positions are kept consistent.

9. The pure pressure touch module display screen according to claim 4, characterized in that: The upper side of the rubber column contacts the backlight source, the lower side of the rubber column contacts the PCB board, and the lower side of the rubber column is arranged at four corners of the PCB board.

10. The pure pressure touch module display screen according to claim 1, characterized in that: The thickness of the segmented foam adhesive layer is 0.6 mm, and the thickness of the cover plate is 1.1 mm.

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