CN210182041U

CN210182041U - TFT module and VA LCD screen integrated composite display

Info

Publication number: CN210182041U
Application number: CN201921225030.7U
Authority: CN
Inventors: Jimin Cui; 崔吉民
Original assignee: YASHI PHOTOELECTRIC CO Ltd
Current assignee: Yashi Optoelectronics (Group) Co.,Ltd.
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-03-24
Anticipated expiration: 2029-07-31

Abstract

The utility model provides a TFT module and VA LCD screen integrated composite display, which comprises a VA type LCD screen, a TFT LCD screen, a left LED backlight and a right LED backlight, wherein the TFT LCD screen is attached to the central area below the VA type LCD screen; the left LED backlight and the right LED backlight are attached to the left side and the right side below the VA type LCD screen, and the PCB circuit board is fixed below the TFT LCD screen and the left LED backlight and the right LED backlight; the circuit structure on the PCB circuit board includes: the main control MCU is connected with a VA-LCD driving chip, a left LED backlight driving circuit and a right LED backlight driving circuit which are connected with ports of the main control MCU. The VA type LCD screen is provided with a left FPC and a right FPC, the port of the VA-LCD driving chip is connected with the left FPC of the VA type LCD screen through the VA-LCD left FPC jack respectively, and the right FPC of the VA type LCD screen is connected through the VA-LCD right FPC jack. A special PCB for driving is designed for the composite display integrating the TFT module and the VA liquid crystal screen, so that the composite display can achieve a good driving display effect.

Description

TFT module and VA LCD screen integrated composite display

Technical Field

The utility model relates to a liquid crystal display technology field, in particular to compound display of TFT module and VA LCD screen integration.

Background

In recent years, liquid crystal displays have been widely used in national defense, industry, public facilities and life of common people by virtue of advantages of small size, low power consumption and the like, and are increasingly used in various electronic equipment products such as instruments, household goods, vehicle-mounted instrument panels and the like. It is of various kinds and complicated. Different types of liquid crystal displays have advantages and disadvantages, such as good contrast of a VA mode display, low mold opening cost, flexible appearance and single display content; the TFT display has good contrast and rich and colorful display contents, but is expensive, and more varieties with fixed specifications are available in the market, so that the uniqueness and the individuation of the product are difficult to realize. Sometimes, a plurality of liquid crystal displays exist on one control panel at the same time in order to display rich contents, and thus, the patch structure of one patch is not in line with the beauty of the public. Therefore, a design idea which is beautiful and practical comes into play.

The patent that publication number is CN 208506450U discloses a LCD panel board with jumbo size TFT screen integration, is the composite display by TFT module and VA LCD screen integration promptly, the utility model discloses the problem that solves is: although the IC bonding technology is a technology commonly used for liquid crystal panels, the driving IC of the composite large-sized display panel is not suitable for IC bonding, because if the large-sized VA liquid crystal panel adopts the bonded driving IC, the driving power is insufficient, and the display effect is not good.

Since the composite display integrated by the TFT module and the VA liquid crystal panel is not suitable for all IC bonding driving, a PCB circuit board dedicated for driving the composite display needs to be designed.

Disclosure of Invention

In order to overcome not enough among the background art, the utility model provides a compound display of TFT module and VA LCD screen integration has designed a PCB circuit board that is exclusively used in the drive for the compound display by the TFT module with VA LCD screen integration, can make this kind of compound display realize good drive display effect.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a TFT module and VA liquid crystal screen integrated composite display comprises a VA type LCD screen, a TFT liquid crystal screen, a left LED backlight and a right LED backlight, wherein the TFT liquid crystal screen is attached to a central area below the VA type LCD screen; the left LED backlight and the right LED backlight are attached to the left side and the right side below the VA type LCD screen.

The utility model also comprises a PCB circuit board which is fixed below the TFT LCD screen and the left LED backlight and the right LED backlight; the circuit structure on the PCB circuit board includes: the main control MCU is connected with a VA-LCD driving chip, a left LED backlight driving circuit and a right LED backlight driving circuit which are connected with ports of the main control MCU.

The VA type LCD screen is provided with a left FPC and a right FPC, the port of the VA-LCD driving chip is connected with the left FPC of the VA type LCD screen through the VA-LCD left FPC jack respectively, and the right FPC of the VA type LCD screen is connected through the VA-LCD right FPC jack.

One end of the left LED backlight driving circuit is connected with the power supply, the other end of the left LED backlight driving circuit is connected with the left LED backlight, one end of the right LED backlight driving circuit is connected with the power supply, and the other end of the right LED backlight driving circuit is connected with the right LED backlight.

Furthermore, a driving IC is bound on the TFT liquid crystal screen, and a TFT-LED backlight is further arranged at the bottom of the TFT liquid crystal screen.

Furthermore, the circuit structure on the PCB circuit board also comprises an LED backlight driving circuit of the TFT, and a port of the main control MCU is directly connected with an FPC socket of the TFT liquid crystal screen and is connected to a driving IC of the TFT liquid crystal screen through the socket; one end of an LED backlight driving circuit of the TFT is connected with a power supply, the other end of the LED backlight driving circuit is connected with an FPC socket of the TFT liquid crystal screen, and the LED backlight driving circuit is connected to the TFT-LED backlight of the TFT liquid crystal screen through the socket.

Furthermore, the circuit structure on the PCB circuit board further comprises a VA-LCD line driving enabling circuit and a VA-LCD column driving enabling circuit which are connected with the main control MCU, the VA-LCD line driving enabling circuit is connected with a left FPC of the VA type LCD screen through a VA-LCD left FPC jack, and the VA-LCD column driving enabling circuit is connected with a right FPC of the VA type LCD screen through a VA-LCD right FPC jack.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the utility model designs a PCB circuit board special for driving for the composite display integrating the TFT module and the VA liquid crystal screen, which can realize good driving display effect;

2) the utility model adopts the drive IC binding technology for the TFT LCD screen, does not adopt IC drive binding for the large-size VA display screen, and adopts the drive chip designed on the circuit board, thereby improving the display drive effect of the large-size VA display screen;

3) the utility model discloses still design respective drive circuit in a poor light for each LED in a poor light simultaneously.

Drawings

Fig. 1 is a schematic view of the overall structure of the display screen of the present invention;

fig. 2 is a block diagram of a circuit structure on the PCB of the present invention;

FIG. 3 is a design diagram of the MCU port of the present invention;

FIG. 4 is a design diagram of the port of the VA-LCD driving chip of the present invention;

fig. 5 is a circuit diagram of the left LED backlight driving circuit and the right LED backlight driving circuit of the present invention;

fig. 6 is a circuit diagram of the LED backlight driving circuit of the TFT of the present invention;

fig. 7 is a VA-LCD row drive enable circuit and a VA-LCD column drive enable circuit diagram of the present invention;

FIG. 8 is a circuit diagram of the VA-LCD left FPC jack port design of the present invention;

FIG. 9 is a circuit diagram of the design of the VA-LCD right FPC jack port of the present invention;

fig. 10 is a circuit diagram of the FPC socket port design of the TFT liquid crystal display of the present invention.

In the figure: 1-VA type LCD screen 2-VA type LCD screen left FPC 3-VA type LCD screen right FPC 4-TFT LCD screen 5-TFT LCD screen FPC 6-left LED backlight 7-right LED backlight 8-TFT LED backlight 9-left LED backlight FPC 10-right LED backlight FPC 11-high viscosity foam 12-PCB board.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, a composite display integrating a TFT module and a VA liquid crystal panel includes a VA-type LCD panel 1, a TFT liquid crystal panel 4, a left LED backlight 6, and a right LED backlight 7, wherein the TFT liquid crystal panel 4 is attached to a central area below the VA-type LCD panel 1; the left LED backlight 6 and the right LED backlight 7 are attached to the left side and the right side below the VA type LCD screen 1.

The utility model also comprises a PCB circuit board 12, the PCB circuit board 12 is fixed below the TFT LCD screen 4 and the left LED backlight and the

right LED backlight

6 and 7; the PCB 12 is attached to the VA mode LCD 1 and the TFT module 4 on the PCB 12 by means of the high viscosity foam 11 attached to the periphery of the PCB.

As shown in fig. 2, the circuit structure on the PCB circuit board 12 includes: the main control MCU is connected with a VA-LCD driving chip, a left LED backlight driving circuit and a right LED backlight driving circuit which are connected with ports of the main control MCU.

As shown in fig. 1-2, the VA LCD panel 1 is provided with a left FPC2 and a right FPC3, and the ports of the VA-LCD driver chip are respectively connected to the left FPC2 of the VA LCD panel through the left FPC socket of the VA-LCD and connected to the right FPC3 of the VA LCD panel through the right FPC socket of the VA-LCD.

As shown in fig. 1-2, one end of the left LED backlight driving circuit is connected to a power supply, and the other end is connected to the left LED backlight 6, and one end of the right LED backlight driving circuit is connected to the power supply, and the other end is connected to the right LED backlight 7.

And a driving IC is bound on the TFT liquid crystal screen 4, and a TFT-LED backlight 8 is also arranged at the bottom of the TFT liquid crystal screen 4.

The circuit structure on the PCB 12 further comprises a TFT LED backlight driving circuit, and a port of the main control MCU is directly connected with an FPC jack of the TFT liquid crystal screen and is connected to a driving IC of the TFT liquid crystal screen through the jack; the LED backlight driving circuit of the TFT has one end connected to the power supply and the other end connected to the FPC jack of the TFT LCD, and is connected to the TFT-LED backlight 8 of the TFT LCD via the FPC5 of the TFT LCD and the jack.

VA type LCD screen 1 is dot matrix LCD screen, the utility model discloses a circuit structure on PCB circuit board 12 still includes VA-LCD line drive enable circuit and VA-LCD row drive enable circuit that is connected with master control MCU, VA-LCD line drive enable circuit and VA-LCD row drive enable circuit are respectively through the left FPC of VA-LCD left side FPC socket connection VA type LCD screen, through the right FPC of VA-LCD right side FPC socket connection VA type LCD screen, line drive and row drive are used for the line and the display control who arranges to dot matrix type LCD screen-VA type LCD screen 1.

Like fig. 3-10, for in fig. 2 the utility model discloses an actual design of each chip and circuit of PCB circuit board, in fig. 3, main control MCU adopts STM32 singlechip, 32 bit ARM microcontroller, Cortex-M3 kernel, the highest operating frequency 72 MHz. And FLASH and SRAM are built in. The support sets are ADC, SPI, USB, I2C and UART, and their connection relationships with other chips and circuits are described in the foregoing description of fig. 2, and the port numbers of STM32 correspond to the interconnection port numbers of other chips one to one, which can be recognized by those skilled in the art and will not be described in detail.

In fig. 4, the VA-LCD driving chip of the present embodiment is ST7072LQFP80, and P32-P35 are ports connected to the main control MCU through I2C, corresponding to fig. 3. SEG0-SEG33 are port numbers corresponding to port numbers on the VA-LCD left FPC jack of fig. 8 and the 9VA-LCD right FPC jack of fig. 8, respectively.

Fig. 5-6 show the driving circuits of the left LED backlight 6, the right LED backlight 7 and the TFT-LED backlight 8, which are all driving circuits formed by transistors (Q3 drives the TFT-LED backlight 8, Q4 drives the left LED backlight 6, Q5 drives the right LED backlight 7), the power supply terminal VCC3.3V is connected to the base of the transistor, the backlight power output terminal VLEDK3(2, 1) is connected to the collector of the transistor, the emitter of the transistor is grounded, and the backlight power supply is connected between VCC3.3V and VLEDK3(2, 1).

Fig. 7 shows a VA-LCD row driving enable circuit and a VA-LCD column driving enable circuit of this embodiment, which are formed by transistors (Q1 and Q2 drive rows and columns, respectively), the base control terminals P15 and P16 of the transistors are connected to the master MCU port, and the collector output terminals TCOM and TSEG are connected to the VA-LCD left FPC socket of fig. 8 and 9 and the VA-LCD right FPC socket of fig. 9, respectively.

The FPC jack of the TFT liquid crystal panel of fig. 10 has a driving port VLEDK1 for the TFT-LED backlight in addition to a connection port to the main control MCU.

The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. A TFT module and VA liquid crystal screen integrated composite display comprises a VA type LCD screen, a TFT liquid crystal screen, a left LED backlight and a right LED backlight, wherein the TFT liquid crystal screen is attached to a central area below the VA type LCD screen; the left LED backlight and the right LED backlight are attached to the left side and the right side below the VA type LCD screen;

the LED backlight module is characterized by further comprising a PCB circuit board, wherein the PCB circuit board is fixed below the TFT liquid crystal screen and the left LED backlight and the right LED backlight; the circuit structure on the PCB circuit board includes: the main control MCU and the VA-LCD driving chip connected with the port of the main control MCU also comprise a left LED backlight driving circuit and a right LED backlight driving circuit;

the VA-type LCD screen is provided with a left FPC and a right FPC, the port of the VA-LCD driving chip is respectively connected with the left FPC of the VA-type LCD screen through a VA-LCD left FPC jack, and is connected with the right FPC of the VA-type LCD screen through a VA-LCD right FPC jack;

2. The integrated composite display of the TFT module and the VA liquid crystal screen of claim 1, wherein a driving IC is bound on the TFT liquid crystal screen, and a TFT-LED backlight is further arranged at the bottom of the TFT liquid crystal screen.

3. The integrated composite display of the TFT module and the VA liquid crystal display of claim 2, wherein the circuit structure on the PCB circuit board further comprises an LED backlight driving circuit of the TFT, and a port of the main control MCU is directly connected with an FPC jack of the TFT liquid crystal display and is connected to a driving IC of the TFT liquid crystal display through the FPC jack; one end of an LED backlight driving circuit of the TFT is connected with a power supply, the other end of the LED backlight driving circuit is connected with an FPC socket of the TFT liquid crystal screen, and the LED backlight driving circuit is connected to the TFT-LED backlight of the TFT liquid crystal screen through the socket.

4. The composite display of claim 1, wherein the circuit structure on the PCB further comprises a VA-LCD row driving enabling circuit and a VA-LCD column driving enabling circuit connected to the main control MCU, the VA-LCD row driving enabling circuit is connected to the left FPC of the VA-LCD screen through a VA-LCD left FPC jack, and the VA-LCD column driving enabling circuit is connected to the right FPC of the VA-LCD screen through a VA-LCD right FPC jack.