A touch panel structure with pattern display

Abstract

The present invention discloses a touch panel structure for pattern display, which comprises: a touch component is arranged on the top surface of a PCB board, and an LED lamp is arranged on the top surface of the PCB board; two groups of LED lamps are arranged at the first end and the second end of the touch component respectively and form a group of controllable light sources, and the first end and the second end are opposite; in a group of controllable light sources, a light guide plate is arranged between the two groups of LED lamps, and the light guide plate is arranged on the upper side of the touch component, and the two groups of LED lamps have light-emitting surfaces facing the light guide plate and perform front lighting or side lighting; if the spacing between two adjacent light guide plates is less than or equal to the preset string light spacing, the side of the light guide plate facing the adjacent light guide plate is an inclined surface; and a film paper is installed on the upper surface of the light guide plate. The control driving difficulty is reduced, the touch display effect is improved, and the manufacturing cost is lower.

Description

Technical Field

[0001] The present invention relates to the field of touch display devices, and in particular to a touch panel structure for pattern display. Background Art

[0002] Existing large appliances, small appliances, smart homes, industrial control, 3C appliances, such as rice cookers, soup cookers, range hoods, disinfection cabinets, dishwashers and microwave ovens, are equipped with corresponding display screens / LED light groups and buttons or touch screens to achieve corresponding human-computer interaction control functions.

[0003] The LED light group, backlight panel, pattern film and button module constitute the traditional display interaction system. When this system is in use, all patterns are illuminated by the backlight panel and LED lights, and the function logo is realized by switching different LED lights to be constantly on or flashing.

[0004] The display interaction system composed of resistive touch screen or capacitive touch screen includes: 1. A system that can only display patterns within a preset pattern film. This type is mostly used in mid- and low-end electrical appliances and has a relatively low cost; 2. A system that realizes the function of displaying active patterns and texts by configuring a display screen with a certain resolution without relying on a preset pattern film. This type is mostly used in high-end electrical appliances and has a relatively high cost.

[0005] The modules of the above two systems require relatively deep installation slots. The disadvantage of the first one is that in a bright environment, users are prone to misjudgment when relying on brightness to judge the functional status. The disadvantages of the second one are mainly higher costs and relatively more complex drive control. Furthermore, the above two types are generally based on SPI communication to achieve data interaction. They have high requirements for basic chip performance and require specific display driver chips.

[0006] Therefore, there is an urgent need for a touch panel structure with pattern display that can solve one or more of the above problems. Summary of the invention

[0007] In order to solve one or more problems existing in the prior art, the present invention provides a touch panel structure with pattern display. The technical solution adopted by the present invention to solve the above problems is: a touch panel structure with pattern display, which comprises: a PCB board, a touch component is arranged on the top surface of the PCB board, the touch component is electrically connected to the internal circuit of the PCB board, an LED light is arranged on the top surface of the PCB board, the LED light is electrically connected to the internal circuit of the PCB board, and the touch component is a capacitive touch module or a resistive touch module;

[0008] The two groups of LED lights are respectively arranged at the first end and the second end of the touch control component to form a group of controllable light sources, and the first end and the second end are opposite to each other;

[0009] In one group of the controllable light sources, a light guide plate is arranged between two groups of the LED lamps, the light guide plate is arranged on the upper side of the touch control component, and the two groups of the LED lamps have light-emitting surfaces facing the light guide plate and perform front lighting or side lighting;

[0010] If the distance between two adjacent light guide plates is less than or equal to the preset string light distance, the side of the light guide plate facing the adjacent light guide plate is an inclined surface, and the inclined surface gradually narrows toward the touch component; the upper surface of the light guide plate is installed with film paper.

[0011] In some embodiments, a filler is provided between the film paper and the PCB board, and the filler is a plastic bracket or foam or other insulating material;

[0012] For example, the filling piece is a plastic bracket and fixes the light guide plate in a limited position.

[0013] In some embodiments, if the distance between two adjacent light guide plates is less than or equal to a preset light-crossing distance, a blocking plate is provided between the two adjacent light guide plates, and the blocking plate is used to prevent light-crossing.

[0014] In some embodiments, if the distance between two adjacent light guide plates is less than or equal to a preset light stringing distance, a shielding layer or a reflective layer is provided on a side of the light guide plate facing the adjacent light guide plate.

[0015] In some embodiments, the film paper is adhered / closely attached to the upper surface of the light guide plate, and the film paper is any one or a combination of a semi-transparent film, a color film, and a fully transparent color film.

[0016] In some embodiments, a diffusion sheet is installed on the light guide plate to increase the uniformity of light; furthermore, the capacitive touch module can be a conductive sheet, such as copper foil, aluminum foil, silver foil or a conventional composite conductive film.

[0017] The technical effect achieved by the present invention is: a capacitive or resistive touch module is selected according to needs to flexibly deploy touch components; wherein the capacitive touch module is set to copper foil, and when in use, when a user touches the above touch pattern, the electric field at the above copper foil will be changed, and the MCU obtains the change of the electric field signal to perform corresponding actions, such as: opening, closing and switching a certain function, each copper foil is equivalent to a button, and finally the backlight of the touch pattern is individually lit or turned off, and this monitoring and control process does not need to configure an additional driver chip or driver circuit, which is simpler to drive than a conventional screen and has a lower cost;

[0018] In terms of structure, it can be made thinner than conventional screens. By configuring the base color of the light guide plate and the color of the film paper (semi-transparent film), all touch patterns can be hidden in the non-backlight state (the logo text corresponding to the copper foil position is not hidden). In the backlight state, only the corresponding touch pattern is lit, and other touch patterns are still hidden, thereby improving the user's recognition of the currently enabled touch pattern in a strong lighting environment;

[0019] Furthermore, by combining the above-mentioned inclined surface with a blocking plate, a shielding layer or a reflective layer, the crosstalk between adjacent light guide plates is further reduced, thereby improving the display effect and the hiding effect of the touch pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the decomposition of the present invention;

[0021] Figure 2 It is a schematic diagram of the light guide plate and the PCB board of the present invention;

[0022] Figure 3 It is a schematic diagram of the LED lamp and the light guide plate of the present invention;

[0023] Figure 4 A schematic diagram of the present invention when a baffle plate is provided;

[0024] Figure 5 This is a schematic diagram of the LED lamp of the present invention;

[0025] Figure 6 The schematic diagram of the first capacitive touch chip of the copper foil of the present invention;

[0026] Figure 7 Schematic diagram of another capacitive touch chip of the copper foil of the present invention

[0027] Figure 8 It is the principle diagram of the MCU of the present invention.

[0028] [Reference Signs]

[0029] 1. PCB board 10, touch component 2, LED lamp 20, light emitting surface 3, light guide plate 30, inclined surface 4, filling piece 5, film paper 6, barrier plate. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from this description, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] like Figure 1-Figure 3 As shown, the present invention discloses a touch panel structure with pattern display, which comprises: a PCB board 1, a touch component 10 is arranged on the top surface of the PCB board 1, and the touch component 10 is electrically connected to the internal circuit of the PCB board 1, and an LED lamp 2 is arranged on the top surface of the PCB board 1, and the LED lamp 2 is electrically connected to the internal circuit of the PCB board 1;

[0032] The touch control component 10 is a capacitive touch control module or a resistive touch control module. When a capacitive touch control module is used, it can be a conductive sheet, such as copper foil, aluminum foil, silver foil or a conventional composite conductive film.

[0033] The touch control component 10 is a copper foil, combined with Figure 1-Figure 3 As shown, the top surface of the PCB board 1 is provided with copper foil (the copper foil is covered with a colored solder resist and forms an insulating layer, such as green oil or other colored solder resist), and the copper foil is electrically connected to the internal circuit of the PCB board 1.

[0034] Specifically, Figure 1-Figure 3 As shown, the two groups of LED lights 2 are respectively arranged at the first end and the second end of the touch component 10 and form a group of controllable light sources, the first end and the second end are opposite, and each group of LED lights can be provided with a plurality of LED lamp beads;

[0035] Combination Figure 3 As shown, in one group of the controllable light sources, a light guide plate 3 is arranged between two groups of the LED lamps 2, and the light guide plate 3 is arranged closely on the upper side of the touch component 10. The two groups of the LED lamps 2 have light-emitting surfaces 20 facing the light guide plate 3, and can be side-lit or front-lit or both side-lit and front-lit; wherein, in the front-lit structure: part of the light guide plate 3 covers the LED lamps;

[0036] It should be pointed out that the LED lamp can be composed of single-color lamp beads or multi-color lamp beads to form a single-color light source or a multi-color light source; the resistive touch module is a conventional resistive key module.

[0037] If the distance between two adjacent light guide plates 3 is less than or equal to the preset string light distance, then one side of the light guide plate 3 facing the adjacent light guide plate 3 is an inclined surface 30, and the inclined surface 30 gradually narrows toward the direction of the touch control component 10;

[0038] In particular, the side of the light guide plate 3 facing the adjacent light guide plate 3 may also be a straight surface. In this case, cross-light prevention is achieved through the blocking plate 6. Furthermore, a diffusion sheet may be installed on the light guide plate to increase the uniformity of light.

[0039] A film paper 5 is pasted or closely installed on the upper surface of the light guide plate 3. The film paper 5 is divided into three types. The first type is a color film, such as: the film paper 5 is printed with a touch pattern, the touch pattern is light-transmissive, and the controllable light source illuminates the touch pattern. This achieves high-brightness and low-brightness contrast selection by changing the brightness of the pattern; the second type is a semi-transparent film, such as: the film paper 5 is formed with a touch pattern layer. In the non-illuminated state, the entire pattern layer is the same color (black) and the pattern cannot be seen. In the illuminated state, the pattern is displayed in the color of the light source, and the color of the light source is different from the color of the pattern layer; the third type is a fully transparent color film, which has a higher light transmittance than ordinary color films; the above three types of film papers can be used in combination as needed.

[0040] It should be noted that the light crosstalk spacing refers to the minimum spacing between two adjacent light guide plates 3 in the backlight state where light crosstalk that is difficult to ignore occurs. This spacing is related to the brightness of the LED lamp 2, the shape, size, thickness, material type, etc. of the light guide plate 3. Therefore, the light crosstalk spacing needs to be set in combination with actual conditions. When the spacing between two adjacent light guide plates 3 is greater than the light crosstalk spacing, the light crosstalk between them can be ignored.

[0041] When two adjacent light guide plates 3 are closely arranged, the inclined surface 30 is arranged on the side of the light guide plate 3 so that the cross section of the light guide plate 3 is in an inverted trapezoidal shape, which can effectively reduce the crosstalk between the adjacent light guide plates 3, thereby improving the display effect and the hiding effect of the touch pattern.

[0042] It should be noted that when the touch component 10 is a copper foil, when the user touches the touch pattern (the position of the touch pattern corresponds to the position of the copper foil) or the corresponding logo (the position of the logo corresponds to the position of the copper foil), the electric field at the copper foil will be changed. The MCU (microcontroller unit) obtains the change of the electric field signal to perform corresponding actions, such as turning on, off and switching a certain function, and finally realizes lighting up or turning off the backlight of the touch pattern separately.

[0043] Furthermore, the light guide plate 3 guides the light of the LED lamp 2 to the touch pattern to realize backlighting. By configuring the base color of the light guide plate 3 (i.e., the color of the touch component 10 on the lower side of the light guide plate 3 and the color of the PCB board 1) and the color of the film paper 5, the touch pattern can be integrated with the opaque part of the film paper 5 in the non-backlight state to achieve hiding.

[0044] Under strong light, since the base color of the light guide plate 3 is similar to the color of the opaque part of the film paper 5, the technical solution of the present application can also achieve a relatively good hiding effect.

[0045] When in use, the position of the touch pattern may correspond to the position of the touch component 10. A single touch component 10 is equivalent to a single control button, thereby individually controlling the lighting up or down of each touch pattern. A text mark may be printed on the lower side of the touch pattern. The user determines the position of the touch pattern by this mark. When the user touches the top of the text mark, it is considered as touching the touch pattern. At this time, the MCU will detect the corresponding signal and execute the corresponding lighting up or down action.

[0046] Specifically, combined Figure 1 As shown, a filling piece 4 is arranged between the film paper 5 and the PCB board 1, and the filling piece 4 is a plastic bracket or foam or other insulating materials; when the filling piece 4 is a plastic bracket, it limits and fixes the light guide plate 3, and when the filling piece 4 is foam, it provides a buffering function.

[0047] Specifically, combined Figure 4 As shown, when two adjacent light guide plates 3 are arranged at intervals, if the interval between the two adjacent light guide plates 3 is less than or equal to the preset light-crossing interval, a blocking plate 6 is arranged between the two adjacent light guide plates 3, and the blocking plate 6 is used to prevent light-crossing.

[0048] Furthermore, if the spacing between two adjacent light guide plates 3 is less than or equal to the preset light-crossing spacing, a shielding layer or a reflective layer is provided on one side of the light guide plate 3 facing the adjacent light guide plate 3. This structure is mostly used when the two light guide plates 3 are closely arranged. The shielding layer or the reflective layer can be a edging formed by an opaque / reflective material, or a coating formed by applying an opaque / reflective paint. This structure combined with the inclined surface 30 can achieve a better anti-light-crossing effect and reduce the influence of light-crossing on the hiding effect of the touch pattern.

[0049] Combination Figure 5 As shown, the common anode of multiple groups of LED lamps is electrically connected to the +12V power supply terminal, and the cathode of each group of LED lamps is electrically connected to the on-off control circuit (composed of MOS tube and resistor), wherein the gate of the MOS tube is electrically connected to the MCU, the source is grounded, and the drain is connected to the output cathode of the single group of LED lamps. For example, MOS tubes Q1 and Q2 are used to control two groups of LED lamps in a single group of controllable light sources. Similarly, Q3, Q10, Q4, Q5, Q6, Q7, Q8, Q9, and Q11 can be control MOS tubes for indicating LED lamps. Each group of LED lamps is provided with 8 or 4 LED lamp beads.

[0050] Combination Figure 6As shown, U2 is a capacitive touch chip, which is used to convert the electric field change signal of the copper foil into a readable signal of the MCU. Its pins include: F1-F6 (corresponding to the copper foil), KEY1-KEY6 (electrically connected to the MCU end); the high / low level signal output by KEY1-KEY6 corresponds to Figure 5 Furthermore, since there are multiple groups of LED lights, two capacitive touch chips are provided. The schematic diagram of the other one is the same as that of chip U2, but the pin numbers are different, corresponding to pins F7-F11 and pins KEY7-KEY11. Figure 7 Chip U3.

[0051] Combination Figure 8 As shown, U4 is MCU, and its two groups of pins are respectively connected to Figure 6 , Figure 7 Capacitive touch chip (U2, U3), Figure 5 The gates of the MOS tubes Q1-Q11 are electrically connected to realize circuit control.

[0052] It can be seen that the solution used in circuit control in this application is simpler than the traditional SPI communication solution.

[0053] In summary, a capacitive or resistive touch module is selected according to the needs to flexibly deploy the touch components; wherein, the capacitive touch module is set as a copper foil. When in use, when the user touches the above touch pattern, the electric field at the above copper foil will be changed. The MCU obtains the change of the electric field signal to perform corresponding actions, such as: turning on, off and switching a certain function. Each copper foil is equivalent to a button, and finally the backlight of the touch pattern is individually lit or turned off. This monitoring and control process does not require the configuration of additional driver chips or driver circuits, and is simpler to drive than conventional screens, and the cost is also lower;

[0054] In terms of structure, it can be made thinner than conventional screens. By configuring the base color of the light guide plate and the color of the film paper (semi-transparent film), all touch patterns can be hidden in the non-backlight state (the logo text corresponding to the copper foil position is not hidden). In the backlight state, only the corresponding touch pattern is lit, and other touch patterns are still hidden, thereby improving the user's recognition of the currently enabled touch pattern in a strong lighting environment;

[0055] Furthermore, by combining the above-mentioned inclined surface with a blocking plate, a shielding layer or a reflective layer, the crosstalk between adjacent light guide plates is further reduced, thereby improving the display effect and the hiding effect of the touch pattern.

[0056] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0057] The above-described embodiments only express one or more implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A touch panel structure for pattern display, characterized in that: include: A PCB board, wherein a touch control component is disposed on the top surface of the PCB board, wherein the touch control component is electrically connected to an internal circuit of the PCB board, wherein an LED lamp is disposed on the top surface of the PCB board, wherein the LED lamp is electrically connected to an internal circuit of the PCB board, and wherein the touch control component is a capacitive touch control module or a resistive touch control module; The two groups of LED lights are respectively arranged at the first end and the second end of the touch control component to form a group of controllable light sources, and the first end and the second end are opposite to each other; In one group of the controllable light sources, a light guide plate is arranged between two groups of the LED lamps, the light guide plate is arranged on the upper side of the touch control component, and the two groups of the LED lamps have light-emitting surfaces facing the light guide plate and perform front lighting or side lighting; If the distance between two adjacent light guide plates is less than or equal to the preset string light distance, the side of the light guide plate facing the adjacent light guide plate is an inclined surface, and the inclined surface gradually narrows toward the touch component; the upper surface of the light guide plate is installed with film paper.

2. The pattern display touch panel structure according to claim 1, characterized in that: A filling piece is arranged between the film paper and the PCB board, and the filling piece is a plastic bracket or foam.

3. The pattern display touch panel structure according to claim 2, characterized in that: The filling piece is a plastic bracket and is used to limit and fix the light guide plate.

4. The pattern display touch panel structure according to claim 1, characterized in that: If the distance between two adjacent light guide plates is less than or equal to a preset light-crossing distance, a blocking plate is arranged between the two adjacent light guide plates, and the blocking plate is used to prevent light-crossing.

5. The pattern display touch panel structure according to claim 1, characterized in that: If the distance between two adjacent light guide plates is less than or equal to a preset light stringing distance, a shielding layer or a reflective layer is provided on one side of the light guide plate facing the adjacent light guide plate.

6. The pattern display touch panel structure according to claim 1, characterized in that: The film paper is pasted on the upper surface of the light guide plate, and the film paper is any one or a combination of a semi-transparent film, a color film and a fully transparent color film.

7. The pattern display touch panel structure according to claim 1, characterized in that: A diffusion sheet is installed on the light guide plate.

8. The pattern display touch panel structure according to claim 1, characterized in that: The capacitive touch module is a conductive sheet.

9. The pattern display touch panel structure according to claim 1 or 8, characterized in that: The capacitive touch module is copper foil.

Images