CN110884349A

CN110884349A - Combined instrument

Info

Publication number: CN110884349A
Application number: CN201911150960.5A
Authority: CN
Inventors: 蔡永荣; 韦家宁; 李文; 何银山; 耿向阳
Original assignee: Dongfeng Electric Drive Systems Co Ltd
Current assignee: Dongfeng Electric Drive Systems Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-03-17

Abstract

The invention relates to the technical field of instruments and meters, in particular to a combined instrument which comprises a shell, a circuit board, a bracket, a TFT screen and a segment code screen. The bracket is fixedly connected with the shell; the circuit board is fixed between the shell and the bracket; the TFT screen is fixed on the support. The segment code screen is arranged on the outer side of the TFT screen, and the TFT screen is arranged opposite to the light valve area of the segment code screen; the segment code screen is fixedly connected with the bracket. The circuit board is integrated with a microcontroller, a first control circuit and a second control circuit; the microcontroller is electrically connected with the first control circuit and the second control circuit; the first control circuit is connected with the LED module of the TFT screen; the second control circuit is connected with the LED module of the segment code screen. The combined instrument provided by the invention enables the brightness and the color of the TFT screen and the segment code screen to be consistent, realizes the integral consistency of the TFT screen and the segment code screen, and enhances the display effect.

Description

Combined instrument

Technical Field

The invention relates to the technical field of instruments and meters, in particular to a combined instrument.

Background

In recent years, with the rapid popularization of concepts of motorization, intellectualization and light weight of automobiles, automobile electronic technology has been dramatically developed. The diversification and individuation requirements of users on the automobile instrument are higher and higher, the instrument is required to have a high-definition picture and a man-machine interaction interface of dynamic science and technology, and the cost of the product is required to have certain advantages. The automobile instrument formed by combining the segment code screen and the color liquid crystal screen is novel in display effect, high in picture definition, smooth in animation, friendly in interface, rich in information, scientific and dynamic in information, obvious in product cost and even only one third of the price of a full liquid crystal instrument with the same specification. However, the segment code screen and liquid crystal screen combination meter in the market at present has the following defects: the existing combination instrument is poor in integrity, the colors and the brightness of two areas of a segment code screen and a liquid crystal screen of the existing combination instrument are not consistent enough, and the splicing traces of the two screens are heavy. Secondly, under the working condition of the existing combination meter at night, ghost images are easily generated on the surface of the segment code screen, namely, displayed contents and the ghost images thereof are overlapped in the range of the meter, so that a user is influenced to accurately and quickly read driving information.

Disclosure of Invention

The invention provides a combined instrument aiming at the technical problems that the color and the brightness of two areas of a segment code screen and a liquid crystal screen of the existing combined instrument are not consistent enough and double images are generated on the surface of the segment code screen in the prior art.

The technical scheme for solving the technical problems is as follows:

a combination meter, comprising: the display screen comprises a shell, a circuit board, a bracket, a TFT screen and a segment code screen; the bracket is fixedly connected with the shell; the circuit board is fixed between the shell and the bracket; the TFT screen is fixed on the bracket; the segment code screen is arranged on the outer side of the TFT screen, and the TFT screen is arranged opposite to the light valve area of the segment code screen; the segment stacking screen is fixedly connected with the bracket; a microcontroller, a first control circuit and a second control circuit are integrated on the circuit board; the microcontroller is electrically connected with the first control circuit and the second control circuit; the first control circuit is connected with the LED module of the TFT screen; the second control circuit is connected with the LED module of the segment code screen.

In a preferred embodiment, the first control circuit includes: the first filter circuit, the first electronic switch, the first current limiting circuit, the second filter circuit and the first light power supply are integrated on the circuit board; the microcontroller is connected with one end of the first electronic switch through the second filter circuit, the first electronic switch is connected with one end of the LED module of the TFT screen, the other end of the LED module of the TFT screen is connected with one end of the second filter circuit through the first current-limiting circuit, and the other end of the second filter circuit is connected with the first lamplight power supply.

In a preferred embodiment, the second control circuit includes: the third filter circuit, the second electronic switch, the second current limiting circuit, the fourth filter circuit and the second lamplight power supply are integrated on the circuit board; the microcontroller is connected with one end of the second electronic switch through the third filter circuit, the second electronic switch is connected with one end of the LED module of the segment code screen, the other end of the LED module of the segment code screen is connected with one end of the fourth filter circuit through the second current limiting circuit, and the other end of the fourth filter circuit is connected with the second lamplight power supply.

In the preferred scheme, the method further comprises the following steps: a lining plate and glass; the lining plate is fixed on the outer side of the bracket; the inner side of the lining plate is abutted to the segment screen, and the glass is fixed to the outer side of the lining plate.

In the preferred scheme, the lining plate is fixedly connected with the bracket through a screw; the glass buckle is fixed on the outer side of the lining plate.

In the preferred scheme, a frosting layer is arranged on the polarizing plate of the segment code screen.

In a preferred embodiment, the light valve area of the segment code screen is disposed in the middle of the segment code screen.

In the preferred scheme, the segment code screen is a 12.3 inch display screen; the TFT screen is a 7-inch display screen.

In the preferred scheme, the circuit board is fixedly connected with the shell through a screw; the bracket is fixedly connected with the shell through a screw; the TFT screen and the segment code screen are fixedly connected with the support through the buckle pieces respectively.

The combined instrument provided by the invention at least has the following beneficial effects or advantages:

the combined instrument provided by the invention is characterized in that a microcontroller, a first control circuit and a second control circuit are integrated on a circuit board; the microcontroller is electrically connected with the first control circuit and the second control circuit; the first control circuit is connected with the LED module of the TFT screen; the second control circuit is connected with the LED module of the segment code screen. The microcontroller adjusts the current value of the first control circuit to further adjust the brightness of the LED module of the TFT screen, and the microcontroller adjusts the current value of the second control circuit to further adjust the brightness of the LED module of the segment code screen, so that the brightness of the LED module and the brightness of the segment code screen tend to be consistent. According to the combined instrument, the on-off time of the LED module of the TFT screen is controlled through the microcontroller and the first control circuit, so that the brightness of the LED module of the TFT screen is adjusted; the on-off time of the LED module of the segment code screen is controlled through the microcontroller and the second control circuit, so that the brightness of the LED module of the segment code screen is adjusted; the brightness of the two tends to be consistent. The combined instrument provided by the invention can also adjust the warm color or the cold color of the backlight source of the LED module of the segment code screen, the shape and the thickness of the light guide body of the light guide medium, the color tone and the thickness of the ink of the color film and the light transmittance and the roughness of the polaroid; adjusting the warm color or the cold color of a TFT screen backlight source, the RGB value of a UI picture and the color resolution of the liquid crystal screen, so that the colors of the TFT screen and the segment code screen tend to be consistent; the integral consistency of the TFT screen and the segment code screen is realized, and the display effect is enhanced.

Drawings

Fig. 1 is an exploded view of a combination meter structure provided in an embodiment of the present invention;

FIG. 2 is a schematic block diagram of a first control circuit according to an embodiment of the present invention;

fig. 3 is a schematic block diagram of a second control circuit according to an embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

the display screen comprises a shell 1, a circuit board 2, a support 3, a TFT screen 4, a segment code screen 5, a lining plate 6 and glass 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a combination meter, which is shown in fig. 1-3 and mainly comprises: the display screen comprises a shell 1, a circuit board 2, a support 3, a TFT screen 4, a segment code screen 5, a lining plate 6 and glass 7. Wherein, the segment code screen 5 is a 12.3 inch display screen; the TFT screen 4 is a 7-inch display screen. The bracket 3 is fixedly connected with the shell 1 through bolts; the circuit board 2 is arranged between the shell 1 and the bracket 3, and the circuit board 2 is fixedly connected with the inner side of the shell 1 through screws. TFT screen 4 buckle is fixed on support 3, the assembly and the dismantlement of TFT screen 4 of being convenient for. The segment code screen 5 is arranged on the outer side of the TFT screen 4, and the TFT screen 4 is arranged opposite to the light valve area of the segment code screen 5; in this embodiment, the light valve area of the segment code screen 5 is arranged in the middle of the segment code screen 5. The segment screen 5 is fixedly connected with the bracket 3 through a fastener. A frosting layer is arranged on the polarizer of the segment screen 5; the frosted factor of the car scale level is added on the polaroid in the segment code screen 5 to form a frosted layer, the roughness is increased, and the mirror reflectivity of the segment code screen 5 is reduced, so that the mirror ghost image is eliminated, and the information display definition is ensured. A microcontroller, a first control circuit and a second control circuit are integrated on the circuit board 2; the microcontroller is electrically connected with the first control circuit and the second control circuit; the first control circuit is connected with the LED module of the TFT screen 4; the second control circuit is connected with the LED module of the segment code screen 5. The lining plate 6 is fixed on the outer side of the bracket 3 through screws; the inner side of the lining plate 6 is abutted against the segment screen 5, and the glass 7 is fixed on the outer side of the lining plate 6 in a buckling mode.

The first control circuit and the second control circuit are further described below:

referring to fig. 2, the first control circuit includes: the first filter circuit, the first electronic switch, the first current limiting circuit, the second filter circuit and the first light power supply are integrated on the circuit board 2. The microcontroller is connected with one end of the first electronic switch through the second filter circuit, the first electronic switch is connected with one end of the LED module of the TFT screen 4, the other end of the LED module of the TFT screen 4 is connected with one end of the second filter circuit through the first current-limiting circuit, and the other end of the second filter circuit is connected with the first lamplight power supply.

Referring to fig. 3, the second control circuit includes: and the third filter circuit, the second electronic switch, the second current limiting circuit, the fourth filter circuit and the second lamplight power supply are integrated on the circuit board 2. The microcontroller is connected with one end of the second electronic switch through the third filter circuit, the second electronic switch is connected with one end of the LED module of the segment code screen 5, the other end of the LED module of the segment code screen 5 is connected with one end of the fourth filter circuit through the second current-limiting circuit, and the other end of the fourth filter circuit is connected with the second lamplight power supply.

The microcontroller, the filter circuit, the electronic switch, the current limiting circuit and the light power supply are common electronic components in the field, and the specific structure of the electronic components is not explained herein.

The control process of the TFT screen 4 is the same as that of the segment code screen 5, namely, the microcontroller outputs a pulse width modulation signal, the pulse width modulation signal is processed by the filter circuit and then is connected with the electronic switch tube, the electronic switch tube is connected with the cathode of the LED module needing brightness adjustment, the anode of the LED module is connected with the light power supply module through the current limiting circuit, and the light power supply module outputs stable voltage through multi-stage filtering.

The combined instrument provided by the invention adjusts the brightness of the LED module (comprising the LED module of the TFT screen 4 and the LED module of the segment code screen 5) mainly based on two aspects of hardware and software: in terms of hardware, a light power supply firstly passes through a filter circuit and then is connected with an LED module needing brightness adjustment through a current limiting circuit, and current finally flows to an instrument ground through an electronic switch, so that the LED module is lightened. The current value of the circuit loop is adjusted by adjusting the threshold value of the current limiting circuit, so that the brightness of the LED module is wholly adjusted up or down. On the aspect of software, under the condition that the threshold value of the current limiting circuit is fixed, when the electronic switch is conducted, the LED module is lightened; when the electronic switch is turned off, the LED module is not lighted. The conduction frequency of the electronic switch can be controlled by a square wave with a certain frequency, and the conduction time of the waveform is related to the duty ratio of the pulse width modulation signal output by the microcontroller. I.e. the LED module brightness is adjusted by the duty cycle. As an optimal scheme, the brightness level of the LED module can be mapped through a test program message, and rapid debugging is facilitated.

The color adjusting process of the combination instrument provided by the invention comprises the following steps: one color, for example, red, displayed in the TFT color liquid crystal panel is selected, and red displayed on the segment code panel 5 is selected. And respectively picking up red samples, and reading indexes such as color temperature, wavelength, brightness and the like through an optical instrument. According to the display principle and color influence factors of the combination instrument, the warm color and the cold color of the backlight source of the segment code screen 5, the shape and the thickness of a light guide body of a light guide medium, the color tone and the thickness of ink of a color film and the light transmittance and the roughness of a polaroid are adjusted; and the adjustment and the warm color and the cold color of the backlight source of the TFT screen 4, the RGB value of the UI picture and the strong color resolution of the liquid crystal screen are realized. After the parameters are measured and the test data are recorded continuously, the color is synchronously adjusted by the method until the color of the two is basically consistent.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A combination meter, comprising: the display screen comprises a shell (1), a circuit board (2), a bracket (3), a TFT screen (4) and a segment code screen (5); the bracket (3) is fixedly connected with the shell (1); the circuit board (2) is fixed between the shell (1) and the bracket (3); the TFT screen (4) is fixed on the bracket (3); the segment code screen (5) is arranged on the outer side of the TFT screen (4), and the TFT screen (4) is arranged opposite to the light valve area of the segment code screen (5); the segment code screen (5) is fixedly connected with the bracket (3); a microcontroller, a first control circuit and a second control circuit are integrated on the circuit board (2); the microcontroller is electrically connected with the first control circuit and the second control circuit; the first control circuit is connected with the LED module of the TFT screen (4); the second control circuit is connected with the LED module of the segment code screen (5).

2. The combination meter of claim 1, wherein the first control circuit comprises: the first filter circuit, the first electronic switch, the first current limiting circuit, the second filter circuit and the first lighting power supply are integrated on the circuit board (2); the microcontroller is connected with one end of the first electronic switch through the second filter circuit, the first electronic switch is connected with one end of the LED module of the TFT screen (4), the other end of the LED module of the TFT screen (4) is connected with one end of the second filter circuit through the first current limiting circuit, and the other end of the second filter circuit is connected with the first lamplight power supply.

3. The combination meter of claim 1, wherein the second control circuit comprises: the third filter circuit, the second electronic switch, the second current limiting circuit, the fourth filter circuit and the second light power supply are integrated on the circuit board (2); the microcontroller is connected with one end of the second electronic switch through the third filter circuit, the second electronic switch is connected with one end of the LED module of the segment code screen (5), the other end of the LED module of the segment code screen (5) is connected with one end of the fourth filter circuit through the second current limiting circuit, and the other end of the fourth filter circuit is connected with the second lamplight power supply.

4. A combination according to any one of claims 1 to 3, further comprising: a lining plate (6) and glass (7); the lining plate (6) is fixed on the outer side of the bracket (3); the inner side of the lining plate (6) is abutted to the segment code screen (5), and the glass (7) is fixed on the outer side of the lining plate (6).

5. Combination according to claim 4, wherein the backing plate (6) is fixedly connected to the support (3) by means of screws; the glass (7) is fixed on the outer side of the lining plate (6) in a buckling mode.

6. Combination according to claim 1, wherein the segment code screen (5) is provided with a frosted layer on the polarizer.

7. Combination according to claim 1, wherein the light valve area of the segment screen (5) is arranged in the middle of the segment screen (5).

8. Combination according to claim 1, wherein the segment code screen (5) is a 12.3 "display screen; the TFT screen (4) is a 7-inch display screen.

9. Combination meter according to claim 1, wherein the circuit board (2) is fixedly connected to the housing (1) by means of screws; the bracket (3) is fixedly connected with the shell (1) through a screw; the TFT screen (4) and the segment code screen (5) are fixedly connected with the support (3) through fasteners respectively.