CN104765897A

CN104765897A - Equal-resistance wiring method for bidirectionally increasing wiring length

Info

Publication number: CN104765897A
Application number: CN201410003578.2A
Authority: CN
Inventors: 刘�东; 杨祖声; 丁斌; 姜广侠
Original assignee: Beijing CEC Huada Electronic Design Co Ltd
Current assignee: Beijing CEC Huada Electronic Design Co Ltd
Priority date: 2014-01-06
Filing date: 2014-01-06
Publication date: 2015-07-08

Abstract

The invention discloses an equal-resistance wiring method for bidirectionally increasing wiring length. Flat panel displays especially liquid crystal displays become the first choice of modern electronic product displays. The flat panel display mainly comprises a display pixel array and an IC control circuit, and the IC circuit controls the pixel display and other signals through the wiring between the IC circuit and an array port. In the large-size electronic product field, such as televisions, computers and the like, good equal-resistance characteristic is equally important for wiring besides a space occupation factor. According to the equal-resistance wiring method, through selecting a proper bending angle and a proper mode for translating a wiring bending section, the wiring has two long vertical sections in two directions, a bow-shaped unit can be arranged in each of the two vertical sections to regulate the resistance, and all the wiring has good equal-resistance characteristic.

Description

A kind of wiring method such as resistance such as grade of two-way increase length of arrangement wire

Technical field

Wiring is one of technical field very important in panel designs.This wiring method of resistance that waits is applied in electric design automation (EDA) flat-panel monitor (FPD) layout design.The invention belongs to flat-panel monitor design and eda tool layout design field.

Background technology

At present, the world enters " information revolution " epoch, and the important composition part-display device as information industry is accelerating the process advancing its panelized.Display technique and display device set electron, communication and information processing technology, in one, occupy very consequence in the evolution of infotech, be considered to electronics industry 20th century microelectronics, another significant development chance after computing machine.

TFT is the abbreviation of " Thin Film Transistor ", general acute pyogenic infection of finger tip film liquid crystal display, and in fact refer to thin film transistor (TFT) (matrix)---can " initiatively " to each on screen independently pixel control, this is so-called active-matrix TFT(active matrix TFT namely) origin.In TFT LCD, each pixel has a TFT, and its grid (gate) is connected to the surface sweeping line of horizontal direction, and drain electrode (drain) is connected to the data line of vertical direction, and source electrode (source) is then connected to pixel electrode.

Wires design occupies very important status in panel designs process.Large scale and small-medium size liquid crystal panel have different index requests for wiring.In smaller screen panel designs field, rational distributing can save panel border area, promotes the reasonable utilization rate of glass substrate.Particularly the current narrow fashionable whole world of frame panel technology, requires that the frame of panel is the smaller the better; And in large-size screen monitors panel field, must guarantee that thousands of IC signal can arrive pel array port on time during wiring, otherwise panel normally cannot show image.Wherein, the factor of signal delay can be caused to be whether the resistance of every root line is highly consistent.

Be how in limited space, to change the resistance connecting up and regulate on different line Deng the difficulty that resistance wiring technique is maximum.Comparing in the smaller screen wires design valuing space resources, the wiring between port is often through under the prerequisite meeting certain wiring width and spacing, and according to certain bending angle, the optimum on implementation space connects up.In the wiring of large scale display panel, on this as far as possible joint wiring basis, space-efficient, addition thereto also to be taked to carry out the resistance of satisfied every root wiring equal.

In large size panel, the pel array of the main connection of wiring and IC port, and two row's ports generally all have different port separation distance, i.e. pitch value.Therefore, the overall tendency of wiring is all from the less one end of pitch, to the larger one end of pitch in " fan-shaped open " shape distribution, i.e. and Fan Out form.Modal wiring configuration is that wiring vertically walks line one segment distance from one end that pitch is less, is designated as Start section, then with a fixed angles bending, vertical pulling one segment distance, be designated as Straight section, the port that finally vertically cabling is larger with pitch is again connected, and is designated as End section.The Straight section controlling adjacent two wirings is parallel and equidistant, finally will realize the wiring of Fan Out form, as shown in Figure 1.

The wiring of Fan out form has larger advantage from space hold.But the resistance characteristic such as generally not there is.Consider and determine that the factor of routing resistance has live width, line length, wiring turning number, and the factor such as the turning resistivity of wiring material and square resistance rate, and the turning resistivity of metal and square resistance rate be independent of wires design outside factor.So by changing wire laying mode, line length or the mode regulating resistance of live width can only be changed.

Summary of the invention

That introduces herein waits resistance wire laying mode, be used in the Fan Out form wiring of large size panel design, each root is connected up and is all conditioned out the vertical section that two sections have certain length, and these the two sections multiple bending routing cells presenting " bow " font of vertical step line segment are substituted, thus change length and the turning number of wiring, regulate routing resistance, finally reach the object that every root routing resistance is equal.

Basic thought: the resistance of wiring and the proportional example of length of arrangement wire increase, and are that inverse proportion increases with live width.Wiring turning can produce less reduction to resistance value, and namely the straight line wiring of same length is slightly larger than the routing resistance with turning.For Fan Out form, wiring intermediate length is little, and two edge lengths are large, so before not doing process further, distribution of resistance is also middle little, and both sides are large.In order to the object of resistance such as realizing, some the straight-line segment position being distributed in middle wiring can be added " bow " font unit of suitable number, and then the length of elongate wirings greatly.Here " straight-line segment position " can be one of " Start " section or " End " section, because require higher wiring for some space occupancy rate, often adopt the bending angle that optimum, and ensure that the spacing between wiring " Straight " section is minimum.Under this bending angle, the length of one of " Start " section or " End " both sections of wiring is often degenerated, as accompanying drawing 1 situation " End " section just cannot add dummy cell, " bow " font unit can only add in remaining one section (" Start " section).For the situation that space requirement is not very high, the bending angle of Fan Out can be changed, adopt the angle that slightly larger than optimal corner, adopt the wiring that this non-optimal angle is formed, middle part there will be larger " Start " section and " End " segment length, all have the length that can add " bow " font unit, the ability of adjusting resistance value can be more flexible in this case, as shown in Figure 2.Another mode, when not changing optimum bending angle, by moving in parallel " Straight " section of wiring, directly " End " section of all wirings is adjusted to an equal length, until enough " bow " font unit can be added, as shown in Figure 3.Although these two kinds of modes have made certain sacrifice in wiring space, but reach the same goal by different routes, be all by obtaining extra vertical section wiring, thus obtain the ability of interpolation " bow " font unit from both direction simultaneously, namely increase the ability that wiring regulates self-resistance.Certainly the introducing of " bow " font unit will certainly increase the turning number of wiring, but as previously mentioned, the impact of turning number on wiring resistance is smaller, can not change the trend that the increase due to length causes resistance to increase.

Accompanying drawing explanation

The wiring of a kind of Fan Out form that Fig. 1 is common

The wiring of a kind of Fan Out form after the improvement of Fig. 2 angle

The wiring of a kind of Fan Out form after Fig. 3 translation " Straight " section

Fig. 4 connect up basic parameter arrange

Fig. 5 two-way " bow " font coiling effect one

Fig. 6 two-way " bow " font coiling effect two

concrete implementation step:

In conjunction with a concrete example, this implementation step waiting resistance wiring method is described:

1) open EDA edit tool, the required basic parameter of wiring is set, as shown in Figure 4;

2) adopt change angle of lay mode, select the two row's ports needing wiring, generation wiring, effect as shown in Figure 5;

3) adopt translation " Straight " segmented mode, select the two row's ports needing wiring, generate wiring, effect as shown in Figure 6.

Claims

1. the invention provides the wiring method such as resistance such as grade in the design of a kind of flat-panel monitor, it is characterized in that: adopt certain bending angle to carry out the wiring of Fan Out form, this angle can make the wiring being positioned at inner side have two sections of vertical section wirings of greater depth, in order to the target of resistance such as reaching, " bow " font bend unit can be added in these two sections of vertical sections, regulate the resistance of wiring.

2. the invention provides the wiring method such as resistance such as grade in the design of a kind of flat-panel monitor, it is characterized in that: ensure from the larger side of port separation distance, the distance of the first vertical cloth one section of equal length of all wirings, then take the mode meeting Fan Out form to continue wiring; Such wiring can ensure the vertical section all from both sides port with certain length, can add " bow " font bend unit in these two sections of vertical sections, regulates the resistance of wiring.