CN2757167Y

CN2757167Y - Liquid display screen

Info

Publication number: CN2757167Y
Application number: CN 200420060460
Authority: CN
Inventors: 马红旭
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2004-07-22
Filing date: 2004-07-22
Publication date: 2006-02-08
Anticipated expiration: 2014-07-22

Abstract

The utility model discloses a liquid display screen which comprises a first transparent base plate, a second transparent base plate, two groups of transparent running cables and a driving IC, wherein the two groups of transparent running cables are mutually vertical and are positioned on the first transparent base plate or the second transparent base plate, the driving IC is positioned in a non-display area of the first transparent base plate or the second transparent base plate, and one group of transparent running cables of the two groups of transparent running cables is at least divided into three parts which are arranged from the upper parts of the first transparent base plate or the second transparent base plate to the driving IC. The utility model is respectively provided with the running cables in the non-display areas at both sides of the two base plates in groups, the space of the running cables is enlarged, the width of the running cables can be adjusted according to the distance of the running cables, and the resistance of the running cables is consistent, which ensures that the contrast grade is homogeneous and improves the display quality.

Description

A kind of LCDs

[technical field]

The utility model relates to a kind of chromatic liquid crystal screen, relates in particular to the ITO Wiring structure of LCDs.

[background technology]

The displaying principle of LCD (LCD) is: COM line (scan electrode) and SEG line (signal electrode) viewing area on two glass substrates forms a matrix, by choosing of DRIVER IC (drive integrated circult) control COM line and SEG line, with liquid crystal applied voltages, make liquid crystal rotation printing opacity to certain pixel.DRIVER IC (drive IC) generally is positioned at the non-display area of glass substrate, COM line and the be connected ITO (indium tin oxide that rely on top glass substrate or glass substrate under non-display area of SEG line with DRIVER IC, a kind of transparent conductive materials) cabling is finished, the direct cabling of general SEG line meeting is to DRIVER IC, the COM line then needs to be grouped in the non-display area cabling of glass substrate both sides to DRIVER IC, if COM line and DRIVER IC not on same glass substrate, then also need to forward on another piece glass substrate from a glass substrate.

In the market the STN-LCD (Supertwist liquid crystal display) that uses of mobile phone from black and white STN-LCD to colored STN-LCD transition, the information capacity of colored STN-LCD is generally all bigger, this just requires the dot matrix quantity of display bigger, thereby the scan electrode number of display is also just many, and the fashion trend on the mobile phone market is a 128-240 scan electrode at present.Colored STN-LCD viewing area is generally 2.7-4.2 centimetre apart from frame, along with increasing of scan electrode, to within zone so narrow and small on the glass substrate, all guide to scan electrode on the DRIVER IC by cabling, must cause the ITO cabling to attenuate, thereby make ITO walk line resistance and become big, and it is inhomogeneous to make ITO walk line resistance easily, thereby and walks the inhomogeneous line drop of walking that just causes the different scanning electrode of line resistance different to cause LCD to show inhomogeneous.Along with increasing of scan electrode number, this demonstration non-uniform phenomenon is just more obvious, as shown in Figure 1, following half screen is first group of ITO cabling 1, at the non-display area cabling on the left side of certain glass substrate to DRIVER IC3, last half screen is second group of ITO cabling 2, at the non-display area cabling on the right of certain glass substrate to DRIVER IC3, because of ITO walks line resistance and track lengths is inversely proportional to, be directly proportional with trace width, but limit because of cabling space, make the ITO cabling not adjust trace width accordingly according to the distance of cabling, so different COM line ITO cabling resistance variations are very big, voltage drop is also different, and then it is inhomogeneous to cause LCD to show.

[summary of the invention]

Fundamental purpose of the present utility model is exactly that LCD shows uneven problem in the prior art in order to solve, and a kind of LCDs is provided, and improves the display quality of LCD.

For achieving the above object, the utility model proposes a kind of LCDs, comprise first transparency carrier, second transparency carrier, two groups of transparent cablings and drive IC, described two groups of transparent mutually vertical cablings, and be positioned on first transparency carrier or second transparency carrier, described drive IC is positioned at the non-display area of first transparency carrier or second transparency carrier, the wherein one group of transparent cabling in two groups of transparent cablings be divided at least three parts at first transparency carrier and the second transparency carrier upward wiring to drive IC.

Usually LCDs has two groups of transparent cablings, i.e. SEG line and COM line, and the SEG line is downward cabling on the vertical view of LCDs being, and the COM line is left and right sides cabling on the vertical view of LCDs.These two groups of transparent cablings are vertical mutually, to form electrode matrix.And the drive IC that drives these two groups of transparent cablings is usually located at the non-display area of a certain glass substrate, for making cabling convenient, the utility model designs one group of direct cabling of transparent cabling to drive IC, and another organize transparent cabling be divided at least three parts at first transparency carrier and the second transparency carrier upward wiring to drive IC.If with drive IC design on the SEG line or below, as shown in Figure 6, then with the direct cabling of SEG line to drive IC, with the COM line be divided into three parts at first transparency carrier and the second transparency carrier upward wiring to drive IC, as shown in Figure 5.

Preferred version is that described to be divided into three parts at least be the COM line at first transparency carrier and the second transparency carrier upward wiring to one group of transparent cabling of drive IC.

Described COM line be divided into impartial four parts respectively at first transparency carrier and the second transparency carrier upward wiring to DRIVERIC.With the width of the ITO cabling of the near described COM line of DRIVER IC distance greater than with the width of the ITO cabling of the described COM line of DRIVER IC distance.

Certainly the COM line can also be divided into three parts, six parts respectively at first transparency carrier and the second transparency carrier upward wiring to DRIVER IC.Prior art is to be divided into two parts at a substrate upward wiring, as long as cabling is divided into more than two parts, and simultaneously at two substrate upward wirings, will be bigger than the cabling space of prior art, adjust the width of cabling easily according to track lengths.

Because DRIVER IC is positioned on a certain substrate, thus cabling need forward on another transparency carrier from a transparency carrier, described respectively organize COM line or SEG line by transfer printing o'clock from a transparency carrier to another transparency carrier, transfer printing point is a conductive gold spacer.

If with drive IC design on the left side or the right of COM line, then with the direct cabling of COM line to drive IC, with the SEG line be divided into three parts at first transparency carrier and the second transparency carrier upward wiring to drive IC.

The beneficial effects of the utility model are: utilize the cabling space cabling of a transparency carrier (for example upper glass or lower-glass) to compare with existing, the utility model utilizes two transparency carriers to carry out cabling (promptly simultaneously at upper glass and lower-glass upward wiring) simultaneously, enlarged cabling space, can suitably adjust the width of cablings according to the length difference of cabling, thereby make each COM line (scan electrode) to walk line resistance basic identical, pressure drop is also basic identical, thereby the voltage that is applied to scan electrode is also basic identical, make the display frame contrast even, improved the display quality of display screen.

Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.

[description of drawings]

Fig. 1 represents that ITO walks line resistance to showing the synoptic diagram of influence in the prior art;

Fig. 2 represents the first transparency carrier upward wiring structural drawing of the prior art;

Fig. 3 represents the second transparency carrier upward wiring structural drawing of the prior art;

Fig. 4 represents the cabling synoptic diagram of a kind of embodiment of the present utility model;

Fig. 5 represents the first transparency carrier upward wiring structural drawing of a kind of embodiment of the present utility model;

Fig. 6 represents the second transparency carrier upward wiring structural drawing of a kind of embodiment of the present utility model.

[embodiment]

Be depicted as the existing trace-diagram that dot matrix is the COLOR STN-LCD of 128*128 as Fig. 2,3, DRIVER IC is SSD1781, and the ITO square resistance is 10 Ω/.It is on the upper glass that scan electrode is positioned at first transparency carrier, it is on the lower-glass that signal electrode is positioned at second transparency carrier, DRIVER IC is positioned at the non-display area of lower-glass and below signal electrode, so the direct cabling of signal electrode is to DRIVER IC, and scan electrode need forward lower-glass to again to DRIVER IC from upper glass, existing cabling mode is that scan electrode is divided into two groups at same cabling on glass, forward on the lower-glass by the transfer printing point earlier by upper glass, then at the non-display area cabling of lower-glass both sides to DRIVER IC.This cabling mode is walked line resistance in limited cabling space can not homogenising.

Embodiment one: as most preferred embodiment of the present utility model, COLOR STN-LCD dot matrix is 128*128, DUTY=1/128, DRIVER IC is PCF8833, the ITO square resistance is 10 Ω/, it is on the upper glass that the COM line is positioned at first transparency carrier, and it is on the lower-glass that the SEG line is positioned at second transparency carrier, and DRIVER IC is positioned at the non-display area of lower-glass and below signal electrode.The COM line is divided into impartial four parts, and as shown in Figure 4, two parts of elder generations forward on the lower-glass by the transfer printing point at the non-display area cabling of upper glass both sides, and cabling is to DRIVER IC then.Other two parts of elder generations are forwarded on the lower-glass by the transfer printing point by upper glass, then at the non-display area cabling of lower-glass both sides to DRIVERIC.The array mode of two parts of COM lines can be the interval array mode, also can be adjacent array mode.Present embodiment adopts array mode at interval, as shown in Figure 4 from top to bottom, first 1/4COM line 21 and the 3rd 1/4COM line 11 are first combination, second 1/4COM line 22 and the 4th 1/4COM line 12 are second combination, be illustrated in figure 5 as upper glass cabling synoptic diagram, first and third 1/4COM line of first combination forwards on the lower-glass by the

transfer printing point

23,13 of both sides respectively, second, four 1/4COM line of second combination respectively at the non-display area cabling of upper glass both sides above DRIVERIC, forward on the lower-glass by

transfer printing point

24,14 again.Be illustrated in figure 6 as lower-glass cabling synoptic diagram, after the

transfer printing point

23,13 of the COM line of first combination by both sides forwards on the lower-glass, at the non-display area cabling of lower-glass both sides to DRIVER IC.This cabling mode has enlarged cabling space, makes the width that can adjust cabling when cabling according to the length of cable run distance, line resistance is consistent, thereby guarantees the contrast unanimity.Because walking line resistance is directly proportional with track lengths, is inversely proportional to trace width, so cable run distance is long more, trace width is wide more, and cable run distance is short more, and trace width is narrow more.

Present embodiment and Fig. 2, prior art shown in Figure 3 are such as table 1, and cabling square number is the ratio of track lengths and trace width, walk line resistance and equal cabling square number and multiply by square resistance.Can find out that from table 1 line resistance of walking of present embodiment passes through to adjust the back basically identical, so the pressure drop of cabling is also consistent, contrast is even.

Table 1

	Embodiment	Prior art
	Embodiment	Prior art	Cabling square number	600	500～2000
Walk line resistance	6KΩ	5K～20KΩ	Cabling square number	600	500～2000
Walk line resistance	6KΩ	5K～20KΩ	Pressure drop (it is 2 μ A that supposition IC walks line current)	Each cabling pressure drop is basic identical, all is 0.012V	Each cabling pressure drop difference carries out the transition to 0.04V from 0.01V
Show contrast	Evenly	Inhomogeneous

Claims

1. LCDs, comprise first transparency carrier, second transparency carrier, two groups of transparent cablings and drive IC, described two groups of transparent cablings are vertical mutually, and be positioned on first transparency carrier or second transparency carrier, described drive IC is positioned at the non-display area of first transparency carrier or second transparency carrier, it is characterized in that: the wherein one group of transparent cabling in two groups of transparent cablings be divided at least three parts at first transparency carrier and the second transparency carrier upward wiring to drive IC.

2. LCDs as claimed in claim 1 is characterized in that: described to be divided into three parts at least be the COM line at first transparency carrier and the second transparency carrier upward wiring to one group of transparent cabling of drive IC.

3. LCDs as claimed in claim 2 is characterized in that: described COM line be divided into impartial four parts respectively at first transparency carrier and the second transparency carrier upward wiring to drive IC.

4. as claim 2 or 3 described LCDs, it is characterized in that: described respectively organize the COM line by transfer printing o'clock from a transparency carrier to another transparency carrier.

5. LCDs as claimed in claim 4 is characterized in that: described transfer printing point is a conductive gold spacer.

6. LCDs as claimed in claim 4 is characterized in that: with the width of the ITO cabling of the near described COM line of drive IC distance greater than with the width of the ITO cabling of the described COM line of drive IC distance.