WO2017074115A1 - Liquid crystal display panel cutting method - Google Patents

Abstract

The present invention relates to a method for removing a data line, which is connected to a dead pixel, from a part, which has been cut, and which is surrounded by a case, thereby preventing noise generation through the dead pixel. A liquid crystal display panel cutting method according to the present invention is a liquid crystal display panel cutting method for cutting a liquid crystal display panel comprising an upper substrate, which has a color filter formed thereon, and a lower substrate, which has a thin-film transistor formed thereon, the liquid crystal display panel cutting method being characterized by comprising: a primary cutting step for cutting a provided liquid crystal display panel along a cutting line, which has been set thereon in advance, thereby forming a display panel that has been cut; and a secondary cutting step for additionally cutting both sides of the display panel that has been cut in the diagonal direction so as to include a data line connected to a dead pixel of the display panel, which has been cut and formed through the primary cutting step.

Description

Cutting method of liquid crystal display panel

The present invention relates to a method of cutting a liquid crystal display panel, and more particularly, to a liquid crystal display which removes a data line connected to a dead pixel from a cut portion wrapped in a case so that noise generation through the dead pixel is blocked. A method of cutting a panel.

A liquid crystal panel of a typical liquid crystal display (LCD) includes a liquid crystal layer having dielectric anisotropy interposed between two substrates.

The desired image is obtained by applying an electric field to the liquid crystal layer, and adjusting the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal layer.

Such a liquid crystal display is typical among portable flat panel displays (FPDs) that are easy to carry, and among them, TFT-LCD using a thin film transistor (TFT) as a switching element is mainly used.

A plurality of display signal lines, that is, a gate line and a data line, a plurality of thin film transistors and a pixel electrode, are formed on a lower substrate of the two substrates disposed to face each other of the liquid crystal panel, and a color filter is formed on the upper substrate of the two substrates. ) And a common electrode are formed.

In general, liquid crystal panels have some standardized sizes. Due to their size, liquid crystal panels have been limited in their use in display devices for various purposes.

In order to overcome the limitations of the size of the liquid crystal panel, a liquid crystal panel cutting technique for cutting a liquid crystal panel to produce a liquid crystal panel having a desired size has been known.

In general, a scribe is formed on the upper substrate and the lower substrate by a laser or the like along a cutting direction to a predetermined depth, and the liquid crystal panel is cut by applying an external force to break at the scribe portion.

Subsequently, the edge of the liquid crystal panel is provided to surround the bezel. In this case, a data line exists at a portion of the side surface of the liquid crystal panel, and exchanges a signal with dead pixels of the cut portion when a voltage is applied. There is a problem that noise occurs at the bottom of the effective screen.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Korean Laid-Open Patent Publication No. 10-2004-0046641

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and in order to cut the display panel to form a cutting panel, and to remove the data line connected to the dead pixel existing in the cut portion, a data line connected to the dead pixel is provided. By further cutting a portion of the panel so that noise generation through dead pixels is blocked, a method of cutting a liquid crystal display panel for manufacturing a liquid crystal display in which a clear screen without noise is displayed on an effective screen of the display panel is provided.

A cutting method of a liquid crystal display panel of the present invention for achieving the above object is provided in the cutting method of a liquid crystal display panel for cutting a liquid crystal display panel comprising an upper substrate with a color filter and a lower substrate with a thin film transistor. Both sides of the cutting display panel may be cut so that the liquid crystal display panel includes a first cutting step of cutting along a preset cutting line to form a cutting display panel and a data line connected to the dead pixels of the cutting display panel formed through the first cutting step. A second cutting step of further cutting in the diagonal direction.

The cutting portion formed by the additional cutting in the second cutting step may be a straight line or a curve in a diagonal direction.

The height of the cut portion formed by the additional cutting in the second cutting step may be 6 mm or less from the bottom of the cut display panel formed through the first cutting step.

It may include a case assembly step of assembling the case on the top, bottom and both sides of the cutting display panel further cut through the cutting step.

According to the cutting method of the liquid crystal display panel of the present invention as described above, in order to cut the display panel to form a cutting panel, and to remove the data line connected to the dead pixel existing in the cut portion, the data line connected to the dead pixel By further cutting a portion of the panel provided to block the generation of noise through the dead pixels, it is possible to manufacture a liquid crystal display in which a clear screen free of noise is displayed on the effective screen of the display panel.

1 is a front view illustrating a display panel according to an embodiment of the present invention.

2 is a block diagram illustrating a display panel according to an embodiment of the present invention.

FIG. 3 is a front view illustrating a cutting panel generated by cutting line A-A ′ in FIG. 1.

4 is a view showing a cut portion of the cutting panel according to an embodiment of the present invention,

5 is an exemplary view illustrating a state in which a screen is displayed through a cutting panel according to an embodiment of the present invention.

6 and 7 are exemplary views illustrating a state in which an actual screen is displayed through a cutting panel according to an embodiment of the present invention.

8 to 10 are exemplary views illustrating a process of further cutting in a cutting panel according to an embodiment of the present invention.

11 is an exemplary diagram illustrating a state in which a screen is displayed through a panel further cut according to an embodiment of the present invention.

12 is an exemplary view showing another form of further cutting in a cutting panel according to an embodiment of the present invention.

* Description of the sign

100: liquid crystal display panel 200: cutting display panel

210: data line 250: gate line

270: effective screen 300: case

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

The display panel 100 to which the liquid crystal display panel cutting method according to the exemplary embodiment of the present invention may be applied is formed with a lower substrate and an upper substrate facing the lower substrate, with reference to FIG. 1, and between the upper substrate and the lower substrate. And a liquid crystal layer comprising liquid crystal molecules oriented vertically or horizontally with respect to the substrate.

The lower substrate is also called a thin film transistor array panel, and the upper substrate is also called a color filter array panel.

As shown in FIG. 2, the display panel 100 includes a plurality of signal lines G1 -Gq and D1 -Dp and a plurality of pixels connected to the plurality of signal lines G1 -Gq and D1 -Dp and arranged in a substantially matrix form ( PX).

As described above, the display panel 100 includes a lower display panel, an upper display panel facing the upper display panel, and a liquid crystal layer including liquid crystal molecules that are formed therebetween and are aligned vertically or horizontally with respect to the two display panels.

The lower display panel is also called a thin film transistor display panel, and the upper display panel is also called a color filter display panel.

The edges of the two display panels are made of a material for joining the two display panels, and define a portion in which the liquid crystal is filled, and a sealing material is provided to prevent the liquid crystal from leaking. A polarizer for polarizing light is attached to the outside of the two display panels It is.

The signal lines G1 -Gq and D1 -Dp may include a plurality of gate lines G1 -Gq for transmitting a gate signal (also referred to as a "scan signal") and a plurality of data lines D1 -Dp for transferring a data signal. Include.

The gate lines G1 -Gq extend substantially in the row direction and are substantially parallel to each other, and the data lines D1 -Dp extend substantially in the column direction and are substantially parallel to each other.

The gray voltage generator 800 generates two sets of gray voltages (or reference gray voltage sets) related to the transmittance of the pixel PX.

One of the two sets has a positive value for the common voltage and the other set is negative

Has a value.

The gate driver 400 is connected to the gate lines G1 -Gq of the display panel to apply a gate signal formed of a combination of the gate on voltage Von and the gate off voltage Voff to the gate lines G1 -Gq.

The data driver 500 is connected to the data lines D1 -Dp of the display panel, selects the gray voltage from the gray voltage generator 800, and applies the gray voltage to the data lines D1 -Dp as data signals.

However, when the gray voltage generator 800 provides only a predetermined number of reference gray voltages instead of providing all of the voltages for all grays, the data driver 500 divides the reference gray voltages to divide the gray voltages for all grays. Generate and select the data signal from it.

The signal controller 600 controls the gate driver 400, the data driver 500, and the like.

Each of the driving devices 400, 500, 600, and 800 may be mounted directly on the display panel in the form of at least one integrated circuit chip, or mounted on a flexible printed circuit film to form a tape carrier package (TCP). It may be attached to the liquid crystal panel assembly 300 in the form of, or mounted on a separate printed circuit board (printed circuit board).

The image processor 700 receives an image signal from an external source, stores the image signal, and generates an input image signal RGB and an input control signal CON to match the display operation of the display panel, and transmits the image signal to the signal controller 600.

The image signal from the outside may or may not meet the resolution and display standard of the display panel. In this case, the image processor 700 may appropriately convert the image signal to match the resolution and display standard of the display panel. .

Next, the operation of the display panel will be described in detail.

The signal controller 600 receives an input image signal RGB and an input control signal CON for controlling the display thereof from the image processor 700.

The input image signal RGB contains luminance information of each pixel PX, and luminance has a predetermined number, for example, 1024 (= 210), 256 (= 28), or 64 (= 26) gray levels. Has)

Examples of the input control signal CON include a vertical sync signal Vsync, a horizontal sync signal Hsync, a main clock MCLK, and a data enable signal DE.

The signal controller 600 properly processes the input image signal RGB based on the input image signal RGB and the input control signal CON according to the operating conditions of the display panel and the data driver 500, and controls the gate control signal CONT1. ) And the data control signal CONT2, and the like, the gate control signal CONT1 is sent to the gate driver 400, and the data control signal CONT2 and the processed image data DAT are transferred to the data driver 500. send.

The gate control signal CONT1 includes a scan start signal STV indicating a scan start and at least one clock signal controlling an output period of the gate-on voltage Von.

The gate control signal CONT1 may also further include an output enable signal OE that defines the duration of the gate-on voltage Von.

The data control signal CONT2 is a load signal LOAD for applying a data signal to the horizontal synchronization start signal STH and the data lines D1 to Dp indicating the start of image data transfer to one pixel PX. The data clock signal HCLK is included.

The data control signal CONT2 is also an inverted signal that inverts the voltage polarity of the data signal relative to the common voltage Vcom (hereinafter referred to as " polarity of the data signal " by reducing the " voltage polarity of the data signal relative to the common voltage "). RVS) may be further included.

In response to the data control signal CONT2 from the signal controller 600, the data driver 500 receives digital image data DAT for one row of pixels PX and corresponds to each digital image data DAT. The digital image data DAT is converted into an analog data signal by selecting a gray voltage to be applied to the corresponding data lines D1 to Dp.

The gate driver 400 applies the gate-on voltage Von to the gate lines G1 -Gq according to the gate control signal CONT1 from the signal controller 600, and is connected to the gate lines G1 -Gq. Turn on (Q).

Then, the data signal applied to the data lines D1 -Dp is applied to the pixel PX through the switching element Q turned on.

The difference between the voltage of the data signal applied to the pixel PX and the common voltage Vcom is shown as the charging voltage of the liquid crystal capacitor Clc, that is, the pixel voltage.

The arrangement of the liquid crystal molecules varies according to the magnitude of the pixel voltage, thereby changing the polarization of light passing through the liquid crystal layer.

This change in polarization is represented by a change in the transmittance of light by a polarizer attached to the display panel.

This process is repeated in units of one horizontal period (also referred to as "1H" and equal to one period of the horizontal sync signal Hsync and the data enable signal DE) to all the gate lines G1-Gq. In response to the gate-on voltage Von, a data signal is applied to all the pixels PX to display an image of one frame.

When one frame ends, the state of the inversion signal RVS applied to the data driver 500 is controlled so that the next frame starts and the polarity of the data signal applied to each pixel PX is opposite to the polarity of the previous frame. "Invert frame").

In this case, the polarity of the data signal flowing through one data line is changed according to the characteristics of the inversion signal (RVS) (eg, inverted row and inverted point) within one frame, or the polarity of the data signal applied to one pixel row is also different. (Eg: nirvana, point inversion).

Next, a method of manufacturing a liquid crystal display device having a desired size by cutting and processing such a liquid crystal display device will be described.

First, as shown in FIG. 1, the completed large liquid crystal display panel 100 is provided to form a cutting line which is a portion to be cut in advance as in A-A '.

The structure of the completed large liquid crystal display panel 100 includes a polarizer, a color filter (CF) substrate, a liquid crystal layer, a thin film transistor (TFT) substrate, and a polarizer.

In order to cut the large liquid crystal display panel 100 completed as described above, first, a polarizing plate peeling step of removing the polarizing plates provided on the front and rear surfaces of the portion to be cut in the longitudinal direction may be performed in advance.

The cut line should be set after observing a portion of the thin film transistor substrate that does not damage the gate line 250 and the data line 210 under a microscope.

Subsequently, as illustrated in FIG. 3, the cutting display panel 200 is formed by first cutting the laser line or the like along a predetermined cutting line in the liquid crystal display panel 100 provided.

In the cut display panel 200 which has been primarily cut, dead pixels exist in the cut portion, and as shown in FIG. 4, the data line 210 and the gate line 250 are connected to the dead pixels. When the case 300 is mounted on the edge of the cut display panel 200 in a state of manufacture, as shown in FIG. 5, power applied to the data line 210 is supplied to the dead pixel to provide noise on the effective screen 270. (N) may occur.

For reference, actual examples of noise generated in the cutting display panel 200 are illustrated in FIGS. 6 and 7.

Therefore, the data line 210 connected to the dead pixel of the cutting display panel 200 is included within the range covered by the case 300 in the cutting display panel 200 subjected to the primary cutting process, as shown in FIG. 8. Likewise, both sides of the cutting display panel 200 are additionally cut in the diagonal direction.

As shown in FIG. 9, the diagonal direction of the secondary cutting is a direction in which the width decreases toward the lower side.

At this time, the starting point of the secondary cutting process is a point 6mm high from the lower part of the cutting display panel formed through the primary cutting process, and the height of the cut portion formed by the secondary cutting process decreases to 6mm or less as the secondary cutting process proceeds. do.

By removing the data line 210 connected to the dead pixel in this way, power is not supplied to the dead pixel existing in the cut display panel 200 which has been cut secondary, and as shown in FIG. When the case 300 is mounted on the top, bottom, and both sides of the edge of the cut display panel 200 which has been cut, the product is displayed on the effective screen 270, as shown in FIG. 11.

In addition, as shown in FIG. 12, the direction of the additional cutting in the secondary cutting may be in the form of a curved curve that is curved inward toward the lower side as well as the diagonal described above. In addition, a data line connected to the dead pixel may be removed. If you can, you can make further cuts in any form.

As described above, according to the cutting method of the liquid crystal display panel of the present invention, the display panel is first cut to form a cutting panel, and in order to remove data lines connected to dead pixels existing in the cut portion, the display panel is connected to the dead pixels. By further cutting the part of the panel provided with the data lines to block noise generation through the dead pixels, a display panel in which a clear screen without noise is displayed on the effective screen of the display panel can be manufactured.

In the above description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto, and a person having ordinary skill in the art to which the present invention pertains does not depart from the technical spirit of the present invention. It will be readily appreciated that various substitutions, modifications and variations can be made.

Part of the panel with a data line connected to the dead pixel in order to form a cutting panel by cutting the display panel according to the method of cutting the liquid crystal display panel according to the present invention, and to remove the data line connected to the dead pixel present in the cut portion By further cutting the to prevent the generation of noise through the dead pixels, it is possible to manufacture a liquid crystal display in which a clear screen without noise is displayed on the effective screen of the display panel.

Claims (4)

In the cutting method of a liquid crystal display panel for cutting a liquid crystal display panel comprising an upper substrate having a color filter and a lower substrate having a thin film transistor, A first cutting step of cutting along a preset cutting line on the provided liquid crystal display panel to form a cutting display panel; and A second cutting step of additionally cutting both sides of the cutting display panel in a diagonal direction so that data lines connected to the dead pixels of the cutting display panel formed through the first cutting step are included; Cutting method of a liquid crystal display panel comprising a The method of claim 1, wherein the cutting portion formed by the additional cutting in the second cutting step is a straight line or a curve in a diagonal direction. The cutting method of claim 1, wherein a height of the cutting part formed by the additional cutting in the second cutting step is 6 mm or less from a lower part of the cutting display panel formed through the first cutting step. The method of claim 1, further comprising a case assembly step of assembling the case on the top, bottom and both sides of the cutting display panel further cut through the cutting step.

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