CN202976786U

CN202976786U - Dot-matrix LCD (liquid crystal display) drive integrated circuit

Info

Publication number: CN202976786U
Application number: CN 201220693619
Authority: CN
Inventors: 周肖强
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-12-16
Filing date: 2012-12-16
Publication date: 2013-06-05
Anticipated expiration: 2022-12-16

Abstract

The utility model discloses a dot-matrix LCD (liquid crystal display) drive integrated circuit and belongs to an LCD drive circuit. The dot-matrix LCD drive integrated circuit comprises an LCD drive and biasing circuit. The LCD drive and biasing circuit is respectively connected to a current detection end CS, a control command input end WR and a data input end DATA. Four COM (communications) output ends and eighteen SEG (segment) output ends are arranged on the LCD drive and biasing circuit. A clock circuit and a timing module which are intrinsic in the LCD drive circuit are removed, the dot-matrix SEG output ends are simplified into eighteen ends, and accordingly the structure of the LCD drive circuit is simplified greatly and late packaging is facilitated. In addition, drive points are increased from 3*18=54 to 4*18=72. The dot-matrix LCD drive integrated circuit is simple in structure, suitable for installation and use in various liquid crystal devices, and widely applicable.

Description

The lattice type LCD drive integrated circult

Technical field

The utility model relates to a kind of LCD driving circuit, and in particular, the utility model relates generally to a kind of lattice type LCD drive integrated circult.

Background technology

the principle of LCD control display is for adopting single-chip microcomputer central processing unit output steering order to drive chip to LCD, LCD drives chip and according to instruction, the liquid crystal dot matrix of display screen is lighted or extinguished control, thereby realize at the corresponding image of liquid crystal display screen display, and present LCD driving chip is more due to output port, and with the LCD dot matrix is driven little clock circuit and the time block of booster action, thereby cause the chip internal operation complicated, driving is counted relatively few, the problems such as the chip package difficulty is large, therefore be necessary to do further improvement on the circuit reduction for LCD driving chip.

Summary of the invention

One of the purpose of this utility model is to solve above-mentioned deficiency, and a kind of lattice type LCD drive integrated circult is provided, and counts with LCD driving circuit driving in expectation solution prior art relatively few, and the circuit structure complexity causes the technical matterss such as encapsulation difficulty.

For solving above-mentioned technical matters, the utility model by the following technical solutions:

A kind of lattice type LCD drive integrated circult provided by the utility model, comprise that LCD drives and biasing circuit, described LCD drives and biasing circuit accesses respectively current detecting end CS, steering order input end WR and data input pin DATA, and described LCD drives and biasing circuit is provided with four road COM output terminals and ten eight road SEG output terminals.

As preferably, further technical scheme is: described integrated circuit also accesses common ground end GND and voltage input end VCC.

Further technical scheme is: described LCD drives and biasing circuit also accesses the display random access memory module.

Further technical scheme is: described LCD drives and biasing circuit also accesses the VLCD input end.

Compared with prior art, one of the beneficial effects of the utility model are: by clock circuit intrinsic in the LCD driving circuit and time block are removed, and with dot matrix SEG output terminal simplify be ten eight the tunnel after, greatly simplified the structure of LCD driving circuit, be conducive to its later stage encapsulation, and driving counts also increases to 4*18=72 by 3*18=54, a kind of lattice type LCD drive integrated circult provided by the utility model is simple in structure simultaneously, be suitable for installing and using in all kinds of liquid crystal devices, range of application is wide.

Description of drawings

Fig. 1 is circuit structure block diagram of the present utility model;

Fig. 2 is chip package figure of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further elaborated.

With reference to figure 1, shown in Figure 2, an embodiment of the present utility model is a kind of lattice type LCD drive integrated circult, comprise that LCD drives and biasing circuit, described LCD drives and biasing circuit accesses respectively current detecting end CS, steering order input end WR and data input pin DATA, and described LCD drives and biasing circuit is provided with four road COM output terminals and ten eight road SEG output terminals.

According to another embodiment of the present utility model: described integrated circuit also accesses common ground end GND and voltage input end VCC.

According to another embodiment of the present utility model: described LCD drives and biasing circuit also accesses the display random access memory module.

According to another embodiment of the present utility model: described LCD drives and biasing circuit also accesses the VLCD input end.

Because will leaning on other single-chip microcomputer or central processing unit, the driving chip of LCD could work to its instruction, therefore after the port on the LCD driving chips such as removal OSCO OSCI IRQ BB BZ RD SEG18-SEG31, with same encapsulation under, owing to having increased COM3, SEG since 0 to 17. SEG is from 0 sequenced words, so instruction number will become simple.Lacked feedback, increased and facilitated instruction, the space of the few steering order of joint has increased counting of driving simultaneously, and that is to say and be originally that 3*18=54 counts, be that 4*18=72 counts now.It is that to read 1621 progress (be mainly 1621 clock that RD was arranged originally, because OSCO OSCI does not have use, so need not read clock), and go out as shown in Figure 2, the output of SEG0-SEG17 order is controlled, for encapsulation such as SDIP28, SOP28, SSOP28, DIP28.

HH1621 is a kind of microcontroller interface that has, and controls driver by 18 * 4 dot matrixs of memory mapped.When circuit powers on, zero clearing resets, hold by order and carry out the duty setting, by sheet select, the reading and writing end carries out reading and writing, retouching operation to the RAM data, according to one-to-one principle, drives LCD display.This circuit can be used for the lattice type LCD display driver, and each SEG end is mutually independently, and easily the RAM data is modified, so show that the dot matrix content is flexible, can customize arbitrarily with the user.

Except above-mentioned, also need to prove, " embodiment " who speaks of in this manual, " another embodiment ", " embodiment ", etc., refer to specific features, structure or the characteristics described in conjunction with this embodiment and be included at least one embodiment that the application's generality describes.A plurality of local appearance statement of the same race is not necessarily to refer to same embodiment in instructions.Furthermore, when describing a specific features, structure or characteristics in conjunction with arbitrary embodiment, what advocate is to realize that in conjunction with other embodiment this feature, structure or characteristics also drop in scope of the present utility model.

Although with reference to a plurality of explanatory embodiment of the present utility model, the utility model is described here, but, should be appreciated that, those skilled in the art can design a lot of other modification and embodiments, and these are revised and within embodiment will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to building block and/or the layout of subject combination layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.

Claims

1. lattice type LCD drive integrated circult, comprise that LCD drives and biasing circuit, described LCD drives and biasing circuit accesses respectively current detecting end CS, steering order input end WR and data input pin DATA, it is characterized in that: described LCD drives and biasing circuit is provided with four road COM output terminals and ten eight road SEG output terminals.

2. lattice type LCD drive integrated circult according to claim 1, it is characterized in that: described integrated circuit also accesses common ground end GND and voltage input end VDD.

3. lattice type LCD drive integrated circult according to claim 1 is characterized in that: described LCD drives and biasing circuit also accesses the display random access memory module.

4. lattice type LCD drive integrated circult according to claim 1 is characterized in that: described LCD drives and biasing circuit also accesses the VLCD input end.