KR20070052424A - Source driver package, method of manufacturing the same and liquid crystal display device having the same - Google Patents

Abstract

A source driver package for a liquid crystal display device. The source driver package includes a base substrate and a source driver that receives a plurality of differential signal pairs from a timing controller. Each of the wiring pairs includes a first wiring for transmitting a first signal of the differential signal pair, and a second wiring for transmitting a second signal having the same amplitude and opposite phase as the first signal. The separation distance between the first wiring and the second wiring on the base substrate is smaller than the separation distance between the wiring pairs. Accordingly, the noise component carried on the differential signal during data transmission is more accurately canceled to reduce EMI of the liquid crystal display.

Source Driver Package, RSDS, EMI

Description

SOURCE DRIVER PACKAGE, METHOD OF MANUFACTURING THE SAME AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1 is a plan view of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a signal diagram illustrating an RSDS interface method for data transmission between a timing controller and a source driver.

3 is a plan view illustrating an embodiment of the source driver package illustrated in FIG. 1.

4 is a plan view illustrating another embodiment of a source driver package.

Explanation of symbols on the main parts of the drawings

10: liquid crystal display device 100: liquid crystal panel

110: TFT substrate 120: color filter substrate

200: printed circuit board 210: timing controller

300: source driver unit 310, 320: source driver package

311, 321: base substrate 312, 322: source driver

400: gate driver

The present invention relates to a liquid crystal display device (LCD), and more particularly, to a source driver package of a liquid crystal display device.

Various interface methods are used between a timing controller and a source driver constituting a liquid crystal display for RGB data or clock transmission. Up to SVGA (800x600) resolution among the liquid crystal display devices, data transfer using a TTL (transistor-transistor logic) interface is mainly performed as an interface method between a timing controller and a source driver. However, to overcome technical difficulties such as power consumption and EMI (Electromagnetic Interference) at XGA (eXtended Graphics Array) resolution (1024x768) or higher, LVDS (Low Voltage Differential Signaling) or RSDS as an interface method between the timing controller and the source driver. Differential signal interface methods such as (Reduced Swing Differential Signaling) are used.

Wires for transmitting data signals are formed between the timing controller and the source driver according to an interface method. Each wire through which a data signal is transmitted forms an electric field induced by the flow of current, and the radiation of the electric field causes EMI to interfere with the normal operation of the component by adding noise to a signal transmitted to an adjacent wire. Therefore, there is a need for an efficient EMI reduction method in the wiring formed between the timing controller and the source driver.

Accordingly, an object of the present invention is to provide a source driver package having a differential signal wiring structure with reduced EMI.

Further, another object of the present invention is to provide a liquid crystal display device having the above source driver package.

Another object of the present invention is to provide a method of manufacturing a source driver package with reduced EMI.

The source driver package according to the present invention includes a base substrate. A source driver is mounted on the base substrate. On the base substrate includes wiring pairs for transmitting differential signal pairs from the outside to the source driver. Each pair of wires includes a first wire for transmitting a first signal of the differential signal pair, and a second wire for transmitting a second signal having the same amplitude and opposite phase as the first signal. The separation distance between the first wiring and the second wiring is smaller than the separation distance between the wiring pairs.

The liquid crystal display according to the present invention comprises a liquid crystal panel, a printed circuit board, and a source driver package. The printed circuit board includes a timing controller for outputting differential signal pairs. The source driver package electrically connects the liquid crystal panel and the printed circuit board. The source driver package includes a base substrate, a source driver, and wire pairs. The source driver is mounted on the base substrate. The wire pairs transmit the differential signal pairs to the source driver. Each pair of wires includes a first wire for transmitting a first signal of the differential signal pair, and a second wire for transmitting a second signal having the same amplitude and opposite phase as the first signal. The separation distance between the first wiring and the second wiring is smaller than the separation distance between the wiring pairs.

The method of manufacturing a source driver package according to the present invention forms a source driver on a base substrate. Wiring pairs are formed on the base substrate to transmit differential signal pairs to the source driver. Each of the wiring pairs is formed of a first wiring for transmitting a first signal of the differential signal pair, and a second wiring for transmitting a second signal having the same amplitude and opposite phase as the first signal. The separation distance between the first wiring and the second wiring is smaller than the separation distance between the wiring pairs.

(Example)

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a liquid crystal display according to an exemplary embodiment of the present invention.

The liquid crystal display device 10 includes a liquid crystal panel 100, a printed circuit board 200 on which the timing controller 210 is mounted, a source driver unit 300, and a gate driver unit 400.

The liquid crystal panel 100 includes a TFT substrate 110 including a thin film transistor, a pixel electrode, and the like, and a liquid crystal (not shown) positioned between the color filter substrate 120 and both substrates 110 and 120. Include. The TFT substrate 110 includes a plurality of pixels formed in a pixel area surrounded by a plurality of gate lines and a plurality of source lines configured to intersect the gate lines. Each pixel includes a thin film transistor, a storage capacitor to reduce current leakage from the liquid crystal, and a liquid crystal capacitor. The gate of the thin film transistor is connected to the gate line, and the source of the thin film transistor is connected to the source line. The storage capacitor is connected between the drain and the ground voltage of the thin film transistor, and the liquid crystal capacitor is connected between the drain and the common voltage of the thin film transistor. The source driver unit 300 including the plurality of source driver packages 310 is positioned on the TFT substrate 110.

Various components such as a timing controller 210 and a driving voltage generator (not shown) are mounted on the printed circuit board 200. The timing controller 210 on the printed circuit board 200 adjusts and outputs data signals to match the timing required by the source driver 300 and the gate driver 400. In addition, the timing controller 210 outputs control signals for controlling the source driver 300 and the gate driver 400.

The source driver unit 300, the source driver part, or the data driver part includes a plurality of source driver packages 310. The source driver 300 outputs a source line driving signal for driving source lines disposed on the liquid crystal panel 100 in response to a data signal and a control signal input from the timing controller 210.

The source driver package 310 electrically connects the printed circuit board 200 including the timing controller 210 and the liquid crystal panel 100. The source driver package 310 includes a base substrate 311 and a source driver 312 mounted on the base substrate 311. The data controller is transmitted between the timing controller 210 and the source driver 312 using an RSDS interface method or an LVDS interface method. On the base substrate 311, wires for data transmission 1P-1N, 2P-2N, ... are formed between the timing controller 210 and the source driver 312. The printed circuit board 200 and the source driver package 310 and the liquid crystal panel 100 and the source driver package 310 are bonded to each other by an anisotropic conductive film (ACF).

The gate driver part 400 includes a plurality of gate drivers and outputs a gate line driving signal for driving gate lines disposed on the liquid crystal panel 100. The gate driver 400 may be mounted on the TFT substrate 110 or may be mounted on a separate substrate (not shown).

2 is a signal diagram illustrating an RSDS interface method for data transmission between a timing controller and a source driver.

The RSDS interface, which is one of the differential signal interface methods, is mainly used for RGB data or clock transmission between the timing controller 210 and the source driver 312. The RSDS interface has the same amplitude (VIHRSDS, VILRSDS) of about 0.2V, and two differential signals (V _RSDS P, V _RSDS N) in opposite phases are paired to transmit data. In the RSDS interface method, two bits of data are sequentially transmitted in synchronization with the rising edge and the falling edge of the clock CLK, respectively. That is, two bits of data are transmitted during one clock 1CLK. The number of differential signal 1P-1N, 2P-2N, ..., mP-mN wirings formed between the timing controller 210 and the source driver 312 is determined according to the number of bits of data to be transmitted. The number n of wirings of the differential signal 1P-1N, 2P-2N, ..., mP-mN may be expressed by Equation 1 below.

n = tb * 3 (RGB) * 2 (differential signal pair) / cb

(Tb: tb: number of bits of transmitted data, cb: number of bits of data transmitted per clock)

According to Equation 1, when the RGB data transmitted between the timing controller 210 and the source driver 312 are 6 bit data, respectively, 18 (= 6 * 3 * 2/2) differential signal wires (that is, nine Differential signal pairs). In addition, when the RGB data transmitted between the timing controller 210 and the source driver 312 are 8-bit data, respectively, 24 (= 8 * 3 * 2/2) differential signal wires (that is, 12 differential signal pairs) This is necessary.

Since the clock signal transmitted between the timing controller 210 and the source driver 312 also uses the RSDS interface method, two differential signal wires (ie, one differential signal pair) may be added.

3 is a plan view illustrating an embodiment of the source driver package 310 shown in FIG. 1.

Referring to FIG. 3, the pin spacing d1 of the source driver 312 to which the pair of differential signal pairs 1P-1N are input is the source driver 312 to which the different differential signal pairs 1N-2P are input. It is wider than the pin spacing d2 of.

Specifically, the source driver package 310 transmits a base substrate 311, a source driver 312 mounted on the base substrate 311, and differential signal pairs 1P-1N, 2P-2N, ... A plurality of wiring pairs L1-L2, L3-L4,... Are formed. The first wire L1 is a wire through which a positive differential signal 1P is transmitted among the pair of differential signal pairs 1P-1N, and the second wire L2 is a pair of differential signal pairs 1P-1N. This is the wiring through which the negative differential signal 1N is transmitted. In this embodiment, since each wiring pair performs the same structure and function, the first wiring L1 and the second wiring L2 will be described as an example.

The first wiring L1 includes a first portion a1 formed at an end of the base substrate 311 and a second portion b1 connected to the source driver 312. The second wiring L2 includes a third portion a2 formed at an end of the base substrate 311 and a fourth portion b2 connected adjacent to the source driver 312. The second portion b1 of the first wiring L1 and the fourth portion b2 of the second wiring L2 are formed in a straight line coinciding with the pin spacing d1 of the source driver 312. The length h2 at which the second portion b1 and the fourth portion b2 are formed in the first wiring L1 and the second wiring L2 can be reduced to a minimum possible in the process. A first portion a1 formed at an end of the base substrate 311 connected to the second portion b1 of the first wiring L1 and a fourth portion b2 of the second wiring L2 connected to the base The distance w1 between the third portions a2 formed at the end of the substrate 311 is configured to be close to the minimum possible in the process. In other words, the distance w1 between the first wiring L1 and the second wiring L2 through which the pair of differential signal pairs 1P-1N is transmitted is determined between the pairs of wiring L1-L2 and L3-L4. It is narrower than the interval w2.

As described above, when the distance w1 between the first wiring L1 and the second wiring L2 to which the pair of differential signals 1P-1N is transmitted is narrowed, the positive differential signal 1P and The cancellation of noise components carried on each of the negative differential signals 1N is more precisely achieved, thereby reducing the EMI of the liquid crystal display 10. Here, as the length h1 of the first portion a1 and the third portion a2 in which the gap w1 between the first wiring L1 and the second wiring L2 becomes narrow becomes longer, the liquid crystal display device ( The effect of reducing EMI in 10) will be further improved. The arrangement of the other wiring pairs L3-L4,... On the source driver package 310 is also formed in the same manner as the arrangement of the first wiring L1 and the second wiring L2.

On the other hand, the wires for transmitting other data signals (eg, STH, POL, etc.) that do not follow the RSDS interface scheme on the source driver package 310 may have a pin arrangement interval d1, d2 of the source driver 312. It is placed in a straight line while maintaining.

4 is a plan view illustrating another embodiment of a source driver package.

The source driver package 320 of FIG. 4 has the same components as the source driver package 310 of FIG. 3, and the arrangement of the wiring pairs L1-L2 and L3-L4 except for the spacing between the respective wiring pairs is illustrated in FIG. Since it is the same as the arrangement of the wiring pairs L1-L2 and L3-L4 of 3, detailed description thereof will be omitted.

Referring to FIG. 4, a source driver 322 into which different differential signal pairs 1N-2P are input with adjacent pin spacings d3 of a source driver 322 into which a pair of differential signal pairs 1P-1N are input. Is equal to the pin spacing d4.

The first wiring L1 includes a first portion a1 formed at an end of the base substrate 321 and a second portion b1 connected to the source driver 322. The second wiring L2 includes a third portion a2 formed at an end of the base substrate 321 and a fourth portion b2 connected to the source driver 322. The second portion b1 of the first wiring L1 and the fourth portion b2 of the second wiring L2 are formed in a straight line coinciding with the pin spacing d1 of the source driver 322. The distance w1 between the first portion a1 of the first wiring L1 and the third portion a2 of the second wiring L2 is configured to be close to the minimum possible in the process. In other words, the distance w3 between the first wiring L1 and the second wiring L2 through which the pair of differential signal pairs 1P-1N are transmitted is determined between the pairs of wirings L1-L2 and L3-L4. It is narrower than the interval w4.

The above embodiment has been described taking an RSDS interface method for reducing EMI of the liquid crystal display as an example, but the features of the present invention can be applied to other interface methods using differential signals.

As described above, the optimum embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention as described above, it is possible to reduce the EMI of the liquid crystal display by adjusting the interval of the wiring for transmitting the differential signal pairs on the source driver package.

Claims (9)

A base substrate; A source driver mounted on the base substrate; And A wiring pair formed on the base substrate and configured to transmit differential signal pairs from the outside to the source driver, Each of the wiring pairs includes a first wiring for transmitting a first signal of the differential signal pair, and a second wiring for transmitting a second signal having the same amplitude and opposite phase as the first signal, And the separation distance between the first wiring and the second wiring is smaller than the separation distance between the wiring pairs. The method of claim 1, The differential signal pair is a source driver package, characterized in that for transmitting the R, G, B data or clock signal. The method of claim 1, The first wiring has a first end connected to the source driver and a second end formed at one end of the base substrate. The second wiring has a third end spaced apart from the first end by a first distance and connected to the source driver, and a fourth end spaced apart from the second end by a second distance and formed at one end of the base substrate. , And the first interval is greater than the second interval. The method of claim 1, The differential signal is a source driver package, characterized in that any one of Low Voltage Differential Signaling (LVDS) and Reduced Swing Differential Signaling (RSDS). The method of claim 1, The source driver package is a tape carrier package (TCP). Liquid crystal panels; A printed circuit board mounted with a timing controller for outputting differential signal pairs; And A source driver package electrically connecting the liquid crystal panel and the printed circuit board, The source driver package, A base substrate; A source driver mounted on the base substrate and receiving the differential signal pairs to drive the liquid crystal panel; And Wiring lines formed on the base substrate to transmit the differential signal pairs; Each of the wiring pairs includes a first wiring for transmitting a first signal of the differential signal pair, and a second wiring for transmitting a second signal having the same amplitude and opposite phase as the first signal, And the separation distance between the first wiring and the second wiring is smaller than the separation distance between the pair of wirings. The method of claim 6, The first wiring has a first end connected to the source driver and a second end formed at one end of the base substrate. The second wiring has a third end spaced apart from the first end by a first distance and connected to the source driver, and a fourth end spaced apart from the second end by a second distance and formed at one end of the base substrate, And the first interval is greater than the second interval. The method of claim 6, The differential signal is any one of Low Voltage Differential Signaling (LVDS) and Reduced Swing Differential Signaling (RSDS). Forming a source driver on the base substrate; And Forming wiring pairs for transmitting differential signal pairs to the source driver, Forming the wire pairs, Forming a first wiring for transmitting a first signal of the differential signal pair; And Forming a second wiring for transmitting a second signal having the same amplitude as that of the first signal and having opposite phases; And the separation distance between the first wiring and the second wiring is smaller than the separation distance between the wiring pairs.

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