CN115309280A

CN115309280A - Color control module replacing liquid crystal display screen and electronic equipment

Info

Publication number: CN115309280A
Application number: CN202111008063.8A
Authority: CN
Inventors: 敖满云; 廖红梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-19
Filing date: 2021-08-30
Publication date: 2022-11-08

Abstract

The embodiment of the application provides a replace liquid crystal display's color control module and electronic equipment, includes: the device comprises a shell, a PCB circuit board, a plastic board, black foam, a silk-screen silver wire layer, a nanometer color film layer and a protective layer; the PCB is electrically connected with the silk-screen silver wire layer and is provided with a plurality of LED lamp beads; this silk screen printing silver-colored layer includes: a plurality of touch-control circuit, nanometer color film layer includes: the high-definition function icons correspond to the touch control circuit positions; the plastic plate and the black foam are both provided with a plurality of hollow frames corresponding to the positions of the plurality of high-definition functional icons; the lamplight of a plurality of LED lamp beads on the PCB can illuminate a plurality of high-definition functional icons through the hollow frames and the silk-screen silver wire layer. The technical scheme provided by the application has the advantage of low cost.

Description

Color control module replacing liquid crystal display screen and electronic equipment

Technical Field

The application relates to the technical field of electronics, especially, relate to a color control module and electronic equipment who replaces liquid crystal display.

Background

The liquid crystal display screen is an active matrix liquid crystal display screen driven by means of Thin Film Transistor (TFT), and is mainly characterized by that it uses current to stimulate liquid crystal molecule to produce point, line and surface, and matches them with back lamp tube to form picture. IPS, TFT, SLCD all belong to the subclass of LCD. The working principle of the liquid crystal display screen is as follows: under the action of an electric field, the arrangement direction of liquid crystal molecules is changed to change (modulate) the light transmittance of an external light source to finish electro-optical conversion, and then different excitations of R, G and B tricolor signals are utilized to finish color reproduction of a time domain and a space domain through a red, green and blue tricolor filter film.

However, the existing liquid crystal display screen has high cost, so a product capable of replacing the liquid crystal display screen in the electronic equipment is needed, and the cost is reduced.

Disclosure of Invention

The embodiment of the application discloses replace liquid crystal display's color control module and electronic equipment can replace liquid crystal display, the cost is reduced.

The first aspect of the embodiment of the application provides replacement liquid crystal display's color control module, includes: the device comprises a shell, a PCB circuit board, a plastic board, black foam, a silk-screen silver wire layer, a nanometer color film layer and a protective layer;

the PCB is electrically connected with the silk-screen silver wire layer and is provided with a plurality of LED lamp beads;

this silk screen printing silver-colored layer includes: a plurality of touch-control circuit, the various rete of nanometer includes: the high-definition function icons correspond to the touch control circuit positions;

the plastic plate and the black foam are provided with a plurality of hollow frames corresponding to the positions of the high-definition function icons; the lamplight of a plurality of LED lamp beads on the PCB can illuminate a plurality of high-definition functional icons through the hollow frames and the silk-screen silver wire layer.

Optionally, the PCB circuit board has a plurality of LED lamp beads arranged in an array.

Optionally, the positions of the non-multiple hollow frames of the black foam are all light-shielding substances.

Optionally, the surface of the protective layer is: planar, concave, or spherical.

Optionally, the protective layer is made of wear-resistant PC, glass, PMMA, PET, or injection-molded plate.

Optionally, the protective layer is transparent or translucent.

Optionally, the touch circuit includes: touch IC and touch capacitor C _t Parasitic capacitance C _p Touch reference capacitance C _g (ii) a Wherein the parasitic capacitance C _p The method can comprise the following steps: routing reference ground capacitor C _tr Touch reference ground capacitance C _ele And a chip internal parasitic capacitor C _com Lead wires, touch electrodes; wherein the content of the first and second substances,

the touch electrode is connected with the input of a touch IC through a lead, and a grounding pin of the touch IC is connected with a local ground wire and a touch reference capacitor C _g One terminal of (a) touch reference capacitance C _g The other end is connected with a common ground;

routing reference ground capacitor C _tr And a touch reference ground capacitance C _ele Are respectively connected with the conducting wire and the local ground wire and touch the reference ground capacitor C _ele Near the touch IC, routing reference ground capacitor C _tr The touch electrode is close to the touch IC far away from the touch IC;

one end of the touch electrode is connected with a touch reference ground capacitor C _ele One terminal of (2), touch reference ground capacitance C _ele The other end of the touch electrode is connected with a local ground wire, and the other end of the touch electrode is connected with a touch capacitor C _t One end of (1), a touch control capacitor C _t The other end of the first and second connecting lines is connected with a common ground;

and the touch IC is used for outputting a touch signal of the touch electrode.

In a second aspect, an electronic device is provided, where the electronic device includes the color control module provided in the first aspect instead of the liquid crystal display.

Optionally, the electronic device is: washing machine, refrigerator, electromagnetic oven, vehicle instrument, vehicle equipment and smoke exhaust ventilator.

The technical scheme that this application provided passes through casing 1, PCB circuit board 2, plastic board 3, black bubble cotton 4, silk screen printing silver-colored line layer 5, the various accuse module of high definition is constituteed to nanometer rete 6 and protective layer 7, the function of touch-control display screen has been accomplished through the various accuse module of high definition like this, for touch-control display screen, the cost of various accuse module reduces by a wide margin, operating temperature has obvious improvement, can all can keep stable at-40 ~ 120, and the operating temperature of touch-control display screen only can keep stable at-5 ~ 45, in addition, the power consumption and the stability of touch-control display screen are all bigger, and the power consumption of the various accuse module of high definition is very low, stability also improves a lot, the life-span can reach more than 10 years, in addition, the operation icon of the various accuse module of high definition is more directly perceived, can reduce user's threshold, improve the intuitionistic of man-machine conversation.

Drawings

The drawings used in the embodiments of the present application are described below.

Fig. 1 is a schematic structural diagram of a color control module replacing a liquid crystal display provided in an embodiment of the present application;

fig. 2 is a schematic circuit diagram of a touch circuit according to an embodiment of the disclosure;

fig. 3 is a schematic view of a roller touch module according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a control circuit according to an embodiment of the present disclosure.

Detailed Description

The embodiments of the present application are described below with reference to the drawings.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this document indicates that the former and latter related objects are in an "or" relationship.

The "plurality" appearing in the embodiments of the present application means two or more. The descriptions of the first, second, etc. appearing in the embodiments of the present application are only for illustrating and differentiating the objects, and do not represent the order or the particular limitation of the number of the devices in the embodiments of the present application, and do not constitute any limitation to the embodiments of the present application. The term "connection" in the embodiment of the present application refers to various connection manners such as direct connection or indirect connection, so as to implement communication between devices, which is not limited in this embodiment of the present application.

The electronic device of the embodiment of the application can be as follows: the electronic devices such as washing machines, refrigerators, electric cookers, electric fans, water heaters, etc. may be some electronic devices, such as vehicle-mounted devices, etc. in practical applications.

Referring to fig. 1, fig. 1 provides a schematic diagram of a color control module replacing a liquid crystal display screen, as shown in fig. 1, the color control module replacing the liquid crystal display screen includes from inside to outside: the device comprises a machine shell 1, a PCB (printed circuit board) 2, a plastic plate 3, black foam 4, a silk-screen silver wire layer 5, a nanometer color film layer 6 and a protective layer 7;

the PCB 2 is electrically connected with the silk-screen silver wire layer 5, and the PCB 2 is provided with a plurality of LED lamp beads arranged in an array;

this silk screen printing silver line layer 5 includes: a plurality of touch control circuits, nanometer color film layer 6 includes: the high-definition function icons correspond to the touch control circuit positions;

the plastic plate 3 and the black foam 4 are both provided with a plurality of hollow frames corresponding to the positions of the high-definition function icons; the light of a plurality of LED lamp pearls on PCB circuit board 2 can see through these a plurality of well hollow frame and silk screen printing silver-colored layer 5 and throw light on a plurality of high definition function icon.

The color control module replacing the liquid crystal display screen can basically replace the liquid crystal display screen in the field of household appliances, can completely replace the liquid crystal display screen except for the fact that the screen refreshing operation cannot be completed, can display a picture with high definition, is fine and smooth in color and lower in cost, is more suitable for the operation of household appliance environments, can well operate and display adaptation in the sun and the dark, and can keep stability at-40-120 degrees; the operation icon of high definition color control module group is more directly perceived, and man-machine operation is more directly perceived, succinct, has broader application scope, can be suitable for to the crowd homoenergetic of all ranges, has avoided old person, the not familiar with the interface of electronic product and the inconvenient problem of operation that leads to of minors.

In an example, the black foam 4 is not provided with a plurality of hollow frames at all positions. The light shielding substance is arranged to shield the light of the LED lamp beads 20, so that light leakage is avoided, and the lighting effect of the high-definition functional icons is improved.

The protective layer 21 is made of, for example, abrasion-resistant PC, glass, PMMA, PET, or an injection-molded plate. The wear-resistant PC, glass, PMMA, PET or injection-molded plate can be transparent or semitransparent.

For example, the surface of the protective layer 21 may be: planar, concave, or spherical.

For example, as shown in fig. 2, the touch circuit includes: touch IC and touch capacitor C _t Parasitic capacitance C _p Touch reference capacitance C _g (ii) a Wherein the parasitic capacitance C _p The method can comprise the following steps: routing reference ground capacitor C _tr Touch reference ground capacitance C _ele And a chip internal parasitic capacitor C _com Lead 30, touch electrode 31; wherein the content of the first and second substances,

touch electrode31 connected to the input of the touch IC via the wires 30, and the grounding pin of the touch IC connected to the local ground and the touch reference capacitor C _g One terminal of (a) touch reference capacitance C _g The other end is connected with a common ground;

routing reference ground capacitor C _tr And a touch reference ground capacitance C _ele Are respectively connected with the conducting wire 30 and the local ground wire and touch the reference ground capacitor C _ele Near the touch IC, routing reference ground capacitor C _tr Away from the touch IC near the touch electrode 31;

one end of the touch electrode 31 is connected with a touch reference ground capacitor C _ele One terminal of (1), touch reference ground capacitance C _ele The other end of the touch electrode 31 is connected to a local ground, and the other end (opposite to the one end) of the touch electrode is connected to a touch capacitor C _t One end of (C), a touch control capacitor C _t The other end of the first and second connecting lines is connected with a common ground;

and a touch IC for outputting a touch signal of the touch electrode 31.

Illustratively, the width of the conductive line 30 is 150 μm to 250 μm. The wires with the width can reduce the parasitic capacitance C _p And further improve the touch sensitivity. Illustratively, if the wires 30 have an included angle, the included angle of the wires is greater than 90 °. A specific range may be 90 to 135 °.

Illustratively, the minimum distance between the common ground and the touch electrode 31 is greater than 5mm. If the distance is too small, i.e. less than 5mm, the touch accuracy is affected.

Referring to fig. 3, if the button is a ring key formed by a plurality of touch keys, a value of a distance a between two adjacent single keys in the ring key is 0.5 to 2mm, a value of a distance A1 between the ring key and the center of the ring is 1.0 to 2.5mm, a value of a distance S between the ring key and the grid is 1 to 2mm, a value of a width W of the single key is greater than 4mm, and a maximum diameter D of the ring key is: greater than 20mm.

Preferably, the optimal value of D is 40mm, the optimal value of W is 8mm, the optimal value of A is 0.5, the optimal value of A1 is 1.5mm, and the optimal value of S is 1.5mm.

A plurality of touch keys are combined together to form a roller (namely a ring-shaped key), and the direction and the position of the sliding of the finger can be detected by matching with an IC (integrated circuit); when the finger strokes on the slide bar, the changes of the two adjacent electrodes are opposite, the electrode with the stronger signal is the position to which the finger is about to arrive, and the electrode with the weaker signal is the position to which the finger is about to leave. Therefore, the distance between two adjacent touch electrodes should not be too large, otherwise, the accurate reaching position of the finger cannot be calculated.

Increasing touch capacitance C _touch The method of (1): reducing the thickness of the circuit board and the panel, namely the covering layer; the covering layer is tightly attached to the capacitor, and the covering layer with a large dielectric constant is selected; the touch electrode area is increased.

The capacitive formula of the capacitor plate is as follows:

C _touch ＝ε*S/(4*π*k*d)；

wherein the dielectric constant of the epsilon cladding layer;

s: contacting a mapping area of the cover layer and the touch electrode with a finger;

k: an electrostatic force constant;

d: the thickness of the cover layer.

Sensor circuit design

And (3) wiring design of the silk-screen silver wire layer 5:

the Sensor line wiring is designed to reduce parasitic capacitance as much as possible and avoid signal interference.

Influence factor of parasitic capacitance: the wiring length > the ground spread around the touch electrode > the wiring ground interval > the number of through holes > the wiring width.

1. The shorter the signal lines of the touch Pad (Pad) connected to the IC, the better the signal, and the longest is not recommended to exceed 300mm;

2. the resistance of the touch Pad connected to the IC signal line must be lower than 10K Ω;

3. the touch Pad and the routing wire are surrounded by grids, and the ground clearance of the touch Pad is 1 mm-2 mm; the area of the grid ground does not exceed 40% of the total area, and the line width of 10 mils and the distance of 50 mils can be set; the area of the lines in the grid ground does not exceed 30% of the total area of the grid; gridding is a compromise between enhancing immunity and ensuring sensitivity.

Mechanism design of silk-screen silver wire layer 5

1. The panel material is made of high-density non-conductive substances such as plastics, glass and the like; it is absolutely impossible to use panels of hollow or porous material, or material that absorbs moisture.

The dielectric constant of the common material is selected to be between 3 and 8, the common thickness is selected to be between 0 and 10mm, and different materials correspond to different typical thicknesses;

for example, the acrylic is generally set between 2mm and 4mm, and the common glass is generally set between 3 mm and 6 mm;

2. any metal can not exist between the sensing electrode and the finger contact surface on the outer side of the panel, so panel printing ink and paint spraying are required to be free of metal powder or conductive substances, electroplating materials are basically metal materials and cannot be used, and metal-containing ink, paint or electroplating is required to be used if the metal luster is required; a circle of non-printing, painting or plating can be left at the edge of the inductive switch to isolate each inductive switch from the area without switches.

3. No gap is left between the induction electrode and the panel, so that a double-sided adhesive tape without a base material is required to be tightly attached to the inner side of the panel; no foam adhesive is used, and an acrylic adhesive-based double-sided adhesive without a base material is recommended. If the panel has two or more layers, the layers must be closely adhered to each other entirely by the double-sided adhesive without the substrate, but it is not recommended to design a multi-layer panel.

4. The surface of the panel is kept as flat as possible, and if the surface of the panel has a radian non-plane surface, the mounting of a subsequent sensor line is considered;

5. the thickness of the panel can affect the size and the sensitivity of the induction electrode, so that the circuit can be designed only by completing the mechanism design; and the panel thickness of each key area is kept consistent.

6. If there is a large metal plate behind the sensing electrode, for example: LCD iron frame, iron cover for isolation or copper sheet battery, etc., these metal objects must be grounded and at least 2mm above the induction electrode;

7. the PCB assembled below the induction electrode is at least 6mm away from the interference signal, and is far away from a high-frequency and high-power circuit or an electric wire, and if the electric wire passes below the PCB, the PCB is far away from the induction electrode (the hand is more than 10 mm), and the electric wire is fixed, so that the phenomenon that the PCB shakes behind the induction electrode is avoided.

Illustratively, the PCB panel 2 may further include: be a plurality of LED lamp pearls of matrix arrangement, this PCB circuit board 2 can also include: a control circuit, as shown in fig. 4, the control circuit comprising: a plurality of LED lamp beads arranged in an m × n matrix, n triodes, a control signal, a power supply, and n capacitors C, for example, as shown in fig. 4, where m is 8 for example, in practical application, m and n may be adjusted according to actual sizes, and are not described herein again.

As shown in fig. 4, the control circuit includes: n divide the circuit, n divide the input of circuit all to be connected with the positive pole of power, and n divides the output ground connection of circuit, and every branch circuit of n divide the circuit all includes: m LED lamp pearls of series connection, electric capacity C, triode T, wherein, triode T's current collector is the input that divides the circuit, and control signal is connected to triode T's base, and one end of series connection's m LED lamp pearls is connected to triode T's projecting pole, and the other end of series connection's m LED lamp pearls is for dividing the output of circuit, electric capacity C and series connection's m LED lamp pearl parallel connection.

The power supply may be an existing voltage source.

For example, the control signal may be a high-level signal and a low-level signal, and the high-level signal is output when the power is turned on, and the low-level signal is output when the power is turned off, so as to control the turn-on of each sub-circuit. The transistor can be a TFT transistor.

Set up this circuit and be for the screen effect of breathing out of analog display screen, to liquid crystal display, when it breathes out the screen, whole screen can slowly darken, the change is slow along with time is darkened slowly, and in order to provide this effect, this application has all increased a electric capacity on every way divides the circuit, thus, during normal display, the power charges for the electric capacity, when closing, the triode closes promptly, this kind of electric capacity C discharges slowly, provide certain electric quantity for m LED, because electric capacity C voltage is lower and lower when discharging slowly, make the voltage of lamp pearl also reduce gradually like this, luminance is also lower and lower, can slow darkening like this, analog display screen's the screen effect of breathing out, improve whole demonstration's effect.

The present application also provides an electronic device, which may include: the color control module replaces the liquid crystal display. For example, the electronic device may specifically be: washing machine, refrigerator, electromagnetism stove, on-vehicle instrument, on-vehicle equipment, smoke ventilator.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The utility model provides a replace liquid crystal display's color control module which characterized in that includes: the device comprises a shell, a PCB circuit board, a plastic board, black foam, a silk-screen silver wire layer, a nanometer color film layer and a protective layer;

the plastic plate and the black foam are provided with a plurality of hollow frames corresponding to the positions of the high-definition function icons; the lamplight of a plurality of LED lamp beads on the PCB circuit board can illuminate a plurality of high-definition functional icons through the plurality of hollow frames and the silk-screen silver wire layer.

2. The color control module as claimed in claim 1, wherein the PCB has a plurality of LED beads arranged in an array.

3. The color control module as recited in claim 1, wherein the color control module is a liquid crystal display,

the positions of the black foam, which are not the hollow frames, are all light-shielding substances.

4. The color control module as claimed in claim 1, wherein the color control module is further characterized in that,

the surface of the protective layer is: planar, concave, or spherical.

5. The color control module as recited in claim 1, wherein the color control module is a liquid crystal display,

the protective layer is made of wear-resistant PC, glass, PMMA, PET or injection-molded plates.

6. The color control module as recited in claim 5, wherein the color control module is a liquid crystal display,

the protective layer is transparent or translucent.

7. The color control module as claimed in claim 1, wherein the color control module is further characterized in that,

the touch circuit includes: touch IC and touch capacitor C _t Parasitic capacitance C _p Touch reference capacitance C _g (ii) a Wherein the parasitic capacitance C _p The method can comprise the following steps: wiring deviceGround-examination capacitor C _tr Touch reference ground capacitance C _ele And a chip internal parasitic capacitor C _com A lead, a touch electrode; wherein the content of the first and second substances,

the touch electrode is connected with the input of a touch IC through a lead, and a grounding pin of the touch IC is connected with a local ground wire and a touch reference capacitor C _g One terminal of (1), touch reference capacitance C _g The other end is connected with a common ground;

routing reference ground capacitor C _tr And a touch reference ground capacitance C _ele Are respectively connected with a conducting wire and a local ground wire and touch reference ground capacitor C _ele Near the touch IC, routing reference ground capacitor C _tr The touch electrode is close to the touch IC far away from the touch IC;

one end of the touch electrode is connected with a touch reference ground capacitor C _ele One terminal of (1), touch reference ground capacitance C _ele The other end of the touch electrode is connected with a local ground wire, and the other end of the touch electrode is connected with a touch capacitor C _t One end of (1), a touch control capacitor C _t The other end of the first and second connecting lines is connected with a common ground;

and the touch IC is used for outputting a touch signal of the touch electrode.

8. An electronic device, characterized in that the electronic device comprises a color control module as claimed in any one of claims 1 to 7 instead of a liquid crystal display.

9. The electronic device of claim 8, wherein the electronic device is: washing machine, refrigerator, electromagnetic oven, vehicle instrument, vehicle equipment and smoke exhaust ventilator.