CN207425327U - A kind of New type LCD driving circuit - Google Patents

Abstract

The utility model discloses a kind of New type LCD driving circuits, including bias voltage module, voltage recombination module, COM PAD modules and SEG PAD modules, the bias voltage module connects voltage recombination module, and voltage recombination module is also respectively connected with COM PAD modules and SEG PAD modules.The utility model LCD driving circuits split into two modules by the way that bias voltage is recombinated, by logic selecting switch, reduce laying out pattern track lengths and quantity.

Description

A kind of New type LCD driving circuit

Technical field

The utility model is related to a kind of driving circuits, are specifically a kind of New type LCD driving circuit.

Background technology

LCD driving circuits, bias voltage generates part generally use electric resistance partial pressure and capacitance partial pressure structure, by each biasing The usual logic selecting switch of voltage passes to the I/O port at COM/SEG.

LCD driving circuits shown in FIG. 1, using electric resistance partial pressure structure, there are many COM/SEG feet of usual IC, distance partial pressure Farther out, therefore line A, B, C, VDD, GND can be long for resistance, and laying out pattern is caused to waste very large area, while increase parasitism Capacitance and dead resistance, reduce driving force.

Utility model content

It is mentioned above in the background art to solve the purpose of this utility model is to provide a kind of New type LCD driving circuit Problem.

To achieve the above object, the utility model provides following technical solution：

A kind of New type LCD driving circuit, including bias voltage module, voltage recombination module, COM PAD modules and SEG PAD modules, the bias voltage module connect voltage recombination module, voltage recombination module be also respectively connected with COM PAD modules and SEG PAD modules.

As further program of the utility model：The bias voltage module include resistance R1, resistance R2, resistance R3, Resistance R4, switch K1 and switch K2, voltage recombination module include single pole multiple throw S1, single pole multiple throw S2, hilted broadsword and throw more Switching S3 and single pole multiple throw S4, COM PAD modules includes single-pole double-throw switch (SPDT) S5 and single-pole double-throw switch (SPDT) S6, SEG PAD Module includes single-pole double-throw switch (SPDT) S7 and single-pole double-throw switch (SPDT) S8, and one end connection resistance R2, switch K1, the hilted broadsword of resistance R1 are thrown more It is more to switch the not movable contact 4 of S1, the not movable contact 4 of single pole multiple throw S2, the not movable contact 4 of single pole multiple throw S3 and hilted broadsword Not movable contact 4 of throw switch S4, other end connection resistance R3, switch K2, the not movable contact of single pole multiple throw S1 of resistance R2 2nd, the motionless of the not movable contact 2 of single pole multiple throw S2, the not movable contact 2 of single pole multiple throw S3 and single pole multiple throw S4 touches Point 2 switchs the other end of K1, the other end for switching K2, single pole multiple throw S1 not the other end connection resistance R4 of resistance R3, Movable contact 3, the not movable contact 3 of single pole multiple throw S2, the not movable contact 3 of single pole multiple throw S3 and single pole multiple throw S4 Not movable contact 3, the not movable contact 1 of single pole multiple throw S1 connect power vd D, not movable contact 1, the hilted broadsword of single pole multiple throw S2 The not movable contact 1 of multithrow switch S3 and not movable contact 1 of single pole multiple throw S4, the not movable contact 5 of single pole multiple throw S1 connect Meet GND, the not movable contact 5 of single pole multiple throw S2, the not movable contact 5 of single pole multiple throw S3 and single pole multiple throw S4 not Movable contact 5, the not movable contact 1 of the movable contact connection single-pole double-throw switch (SPDT) S5 of single pole multiple throw S1 and single-pole double-throw switch (SPDT) S6's Not movable contact 1, the not movable contact 2 and single-pole double-throw switch (SPDT) S6 of the movable contact connection single-pole double-throw switch (SPDT) S5 of single pole multiple throw S2 Not movable contact 2, the not movable contact 1 and single-pole double-throw switch (SPDT) of the movable contact connection single-pole double-throw switch (SPDT) S7 of single pole multiple throw S3 Not movable contact 1 of S8, the not movable contact 2 and single-pole double throw of the movable contact connection single-pole double-throw switch (SPDT) S7 of single pole multiple throw S4 are opened Close not movable contact 2 of S8, the movable contact connection of single pole multiple throw S5.

Compared with prior art, the beneficial effects of the utility model are：The utility model LCD driving circuits will be by that will bias Voltage recombinates, and logic selecting switch is split into two modules, reduces laying out pattern track lengths and quantity.

Description of the drawings

Fig. 1 is traditional LC D driving circuit structures.

Fig. 2 is the utility model LCD driving circuit structures.

Fig. 3 is the utility model LCD driving circuit figures.

Specific embodiment

The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work All other embodiments obtained shall fall within the protection scope of the present invention.

Referring to Fig. 1, in the utility model embodiment, a kind of New type LCD driving circuit, including bias voltage module, electricity Press recombination module, COM PAD modules and SEG PAD modules, which is characterized in that the bias voltage module generates all biased electricals Pressure point, and according to the different selections of BIAS of LCD useful electrical voltage point V1, V2, V3 to voltage recombination module, voltage recombination module V1, V2, V3 are divided into COMVH/COMVL and SEGVH/SEGVL, then according to the data of PAD export COMVH/COMVL or SEGVH/SEGVL。

The operation principle of the utility model is：As shown in Figure 2, this driving circuit is made of three modules, bias voltage, Voltage recombinates and COM/SEG PAD modules.

Bias voltage module generates all biased electrical pressure points, and according to the useful electrical voltage point of the different selections of BIAS of LCD To V1, V2, V3.By taking 1/2BIAS, 1/3BIAS and 1/4BIAS as an example, according to selection 1/N BIAS and FRAME, by bias voltage It is divided into two groups of signals, is respectively COMVH/COMVL and SEGVH/SEGVL, wherein being redefined to 1/N VDD as follows：

V1, V2, V3 are defined	V1	V3	V2
				1/2BIAS	1/2VDD	1/2VDD	--
1/3BIAS	2/3VDD	1/3VDD	--
				1/4BIAS	3/4VDD	1/4VDD	2/4VDD

COMVH/COMVL and SEGVH/SEGVL are defined as follows：

Including the state under SLEEP patterns, when SLPLCD_EN is high, into SLEEP patterns.

As shown in Figure 3 for practical circuit diagram, bias voltage part divides VDD by equal resistance, according to Family configuration can select 1/N BIAS (N 2,3,4), and V1, V2, V3 are divided into COMVH/COMVL and SEGVH/ by voltage restructuring Then SEGVL exports COMVH/COMVL or SEGVH/SEGVL according to the data of PAD.

Traditional LCD circuits are in laying out pattern, and by taking 1/4BIAS as an example, cabling is more and long line is A, B, C, VDD And GND, VDD herein and GND should compared with it is clean, therefore need independent cabling.And this paper LCD driving circuit cablings it is longer be COMVH/COMVL and SEGVH/SEGVL, it is fewer than traditional LC D driving circuit cablings, and in 1/N BIAS, when N is bigger, saving Long cabling it is more because when N is bigger, traditional LC D driving circuit bias voltages are more, and cabling is also more, and this paper LCD drive The dynamic long cabling of circuit only has four.

Claims (2)

1. a kind of New type LCD driving circuit, including bias voltage module, voltage recombination module, COM PAD modules and SEG PAD Module, which is characterized in that the bias voltage module connects voltage recombination module, and voltage recombination module is also respectively connected with COM PAD modules and SEG PAD modules.

2. a kind of New type LCD driving circuit according to claim 1, which is characterized in that the bias voltage module includes Resistance R1, resistance R2, resistance R3, resistance R4, switch K1 and switch K2, voltage recombination module include single pole multiple throw S1, list Knife multithrow switch S2, single pole multiple throw S3 and single pole multiple throw S4, COM PAD modules include single-pole double-throw switch (SPDT) S5 and list Double-pole double throw switch S6, SEG PAD modules include single-pole double-throw switch (SPDT) S7 and single-pole double-throw switch (SPDT) S8, one end connection electricity of resistance R1 Hinder R2, switch K1, the not movable contact 4 of single pole multiple throw S1, not movable contact 4, the single pole multiple throw of single pole multiple throw S2 The not movable contact 4 of S3 and not movable contact 4 of single pole multiple throw S4, other end connection resistance R3, switch K2, the hilted broadsword of resistance R2 The not movable contact 2 of multithrow switch S1, the not movable contact 2 of single pole multiple throw S2, the not movable contact 2 and list of single pole multiple throw S3 Not movable contact 2 of knife multithrow switch S4 switch the other end of K1, switch the another of K2 the other end connection resistance R4 of resistance R3, End, the motionless of the not movable contact 3 of single pole multiple throw S1, the not movable contact 3 of single pole multiple throw S2, single pole multiple throw S3 touch The not movable contact 3 of point 3 and single pole multiple throw S4, the not movable contact 1 of single pole multiple throw S1 connect power vd D, hilted broadsword and throw more Not movable contact 1, the not movable contact 1 of single pole multiple throw S3 and not movable contact 1 of single pole multiple throw S4 of S2 is switched, hilted broadsword is more The not movable contact 5 of throw switch S1 connects GND, the not movable contact 5 of single pole multiple throw S2, the not movable contact of single pole multiple throw S3 Not movable contact 5 of 5 and single pole multiple throw S4, motionless the touching of the movable contact connection single-pole double-throw switch (SPDT) S5 of single pole multiple throw S1 The not movable contact 1 of point 1 and single-pole double-throw switch (SPDT) S6, the movable contact connection single-pole double-throw switch (SPDT) S5's of single pole multiple throw S2 is motionless Contact 2 and not movable contact 2 of single-pole double-throw switch (SPDT) S6, the movable contact connection single-pole double-throw switch (SPDT) S7 of single pole multiple throw S3 is not Not movable contact 1 of movable contact 1 and single-pole double-throw switch (SPDT) S8, the movable contact connection single-pole double-throw switch (SPDT) S7's of single pole multiple throw S4 Not not movable contact 2 of movable contact 2 and single-pole double-throw switch (SPDT) S8, the movable contact connection of single pole multiple throw S5.