KR20080061894A - Liquid crystal display panel and its manufacturing method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and a method for manufacturing the same, wherein a repair filter for blocking light of a specific wavelength in a pixel having a bright point is formed on one of a lower bottom substrate, an upper top substrate, and both There is an advantage that can easily repair the defect (Repair).

Description

 Liquid crystal display panel and method for manufacturing the same

1 is a schematic cross-sectional view of a liquid crystal display panel applied to the present invention.

2 is a graph showing the wavelength spectrum of the color filter of the liquid crystal display panel applied to the present invention

3A to 3B illustrate a process of repairing pixels of a liquid crystal display panel according to the present invention.

4A to 4C are graphs for explaining that the filter for repair applied to the present invention filters for each wavelength.

5 is a schematic cross-sectional view showing a first embodiment of a repaired liquid crystal display panel according to the present invention.

FIG. 6 is a schematic cross-sectional view illustrating a state in which a polarizing plate is attached to a lower portion of a repair filter of the liquid crystal display panel of FIG. 5.

7 is a schematic cross-sectional view showing a second embodiment of a repaired liquid crystal display panel according to the present invention.

8 is a schematic cross-sectional view showing a third embodiment of a liquid crystal display panel repaired according to the present invention.

9 is a schematic flowchart illustrating a method of manufacturing a liquid crystal display panel according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: upper substrate 11, 12, 13: thin film transistor

20: liquid crystal material 30: black matrix pattern

31, 32, 33: color filter 50: upper substrate

60,61,62: Repair filter 70: Polarizing plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and a method for manufacturing the same, and more particularly, to a liquid crystal display panel and a method for manufacturing the same that can repair a bright point defect.

Various flat panel displays have been developed to reduce weight and volume, which are disadvantages of conventional cathode ray tubes.

Such a flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, an electro luminescence display, and the like.

Here, the liquid crystal display device is in a trend that its application range is gradually widening due to the characteristics such as light weight, thinness, low power consumption driving.

In accordance with this trend, liquid crystal displays are used in office automation equipment, audio, video equipment, computer monitors, broadcast reception monitors, and the like.

In order to use the liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness, and large area can be realized while maintaining the characteristics of light weight, thinness, and low power consumption. can do.

A normal liquid crystal display device displays an image by adjusting the light transmittance of the liquid crystal using an electric field.

To this end, the liquid crystal display includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix and a driving circuit for driving the liquid crystal panel.

Therefore, the liquid crystal display device is comprised from the 1st board | substrate and the 2nd board | substrate which were bonded by the fixed space, and the liquid crystal layer injected between the said 1st board | substrate and the 2nd board | substrate.

In more detail, the first substrate has a plurality of gate lines in one direction and a plurality of data lines at regular intervals in a direction perpendicular to the gate line to define a pixel area.

In addition, a pixel electrode is formed in the pixel region, and a thin film transistor is formed at a portion where the gate line and the data line cross each other, and a data signal of the data line is applied to each pixel electrode according to a signal applied to the gate line. Is authorized.

In addition, a black matrix layer is formed on the second substrate to block light in portions other than the pixel region, and portions corresponding to each pixel region are R, G, B, and color filter layers for expressing color. A common electrode for realizing an image is formed on the color filter layer.

In the liquid crystal display as described above, the liquid crystal of the liquid crystal layer formed between the first and second substrates is aligned by an electric field between the pixel electrode and the common electrode, and the light passes through the liquid crystal layer according to the degree of alignment of the liquid crystal layer. Adjust the amount of to express the image.

Such a liquid crystal display device is called a twisted nematic (TN) mode liquid crystal display device, and the TN mode liquid crystal display device has a disadvantage of having a narrow viewing angle, and a transverse electric field type (IPS: In-) for overcoming the disadvantage of the TN mode. Plane Swiching mode liquid crystal display has been developed.

In the transverse electric field mode liquid crystal display, a pixel electrode and a common electrode are formed parallel to each other at a predetermined distance in a pixel area of the first substrate so that a transverse electric field is generated between the pixel electrode and the common electrode, This is to align the liquid crystal layer.

Meanwhile, among the flat panel display devices, the amount of liquid crystal display devices used is increasing day by day, and the size of the liquid crystal display devices is gradually increasing.

In addition, as the number of manufacturers of liquid crystal display devices increases rapidly, price competition and quality competition are fierce.

By the way, in the manufacturing process of the liquid crystal display inevitably there is a bright point defect of more than a certain ratio, and the defect requests from broadcast receiver manufacturers and consumers are rapidly increasing.

Currently, when a bright point defect occurs, a repair process is performed to shorten or open a thin film transistor by using a laser to darken it.

Such a type of bright point defect of a liquid crystal display is caused by a defect caused by various types such as a circuit defect of a thin film transistor, a defect caused by a foreign material, and a color filter torn off, and the defect caused by a foreign material is caused by an electrical method using a laser. You cannot repair it.

In order to solve the problems described above, the present invention provides a liquid crystal display that can easily repair a defective spot by forming a repair filter that blocks any one of green light, blue light and red light in a pixel having a poor spot. It is an object to provide a panel and a method of manufacturing the same.

A preferred aspect for achieving the above objects of the present invention,

A lower substrate; An upper substrate positioned above the lower substrate; In a liquid crystal display panel including a liquid crystal material filled between the lower substrate and the upper substrate, and having a plurality of pixels,

Among the plurality of pixels, a liquid crystal display panel further includes a repair filter for blocking any one of green light, blue light, and red light from each pixel having a bright point defect.

Another preferred aspect for achieving the above object of the present invention,

A lower substrate;

First and third color filters configured to transmit green light, red light, and blue light, respectively, and formed at a lower side of the upper substrate, the upper substrate being positioned above the lower substrate; It comprises a liquid crystal material filled between the lower substrate and the upper substrate,

And a plurality of pixels, each of which is composed of a region in which green light, red light, and blue light transmitted from the first to third color filters are emitted.

Among the plurality of pixels, a repair filter for blocking light of a specific wavelength in each of the pixels having a bright point is formed on one of the lower substrate, the upper substrate, and both of them. A display panel is provided.

Another preferred aspect for achieving the above object of the present invention is a liquid crystal display panel in which a plurality of pixels each formed of a region in which green light is emitted, a region in which blue light is emitted, and a region in which red light is emitted are formed. Preparing;

Checking whether pixels of the liquid crystal display panel have a bright point defect;

In the step of checking whether there is a bright spot defect, if there is a pixel having a bright spot defect, forming a repair filter in the liquid crystal display panel region corresponding to the pixel and performing a repair process A method for producing is provided.

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

1 is a schematic cross-sectional view of a liquid crystal display panel applied to the present invention, including a lower substrate 10; An upper substrate 50 positioned above the lower substrate 10 and spaced apart from the lower substrate 10; The liquid crystal material 20 is filled between the lower substrate 10 and the upper substrate 50.

Here, first to third color filters 31, 32, and 33 are formed below the upper substrate 50 to transmit green light, red light, and blue light, respectively.

In addition, a plurality of thin film transistors 11, 12, and 13 are arranged on the lower substrate 10.

The black matrix pattern 30 may be formed between the first to third color filters 31, 32, and 33.

As such, in the liquid crystal display panel configured, white light incident on the lower substrate 10 passes through the liquid crystal material 20 and is emitted from the first to third color filters 31, 32, and 33 as green light, red light, and blue light. do.

2 is a graph showing a wavelength spectrum of a color filter of a liquid crystal display panel applied to the present invention, wherein the color filters of the liquid crystal display panel transmit only green light, red light and blue light in white light.

That is, the green color filter transmits only green light, the red color filter transmits only red light, and the blue color filter transmits only blue light.

3A to 3B illustrate a process in which pixels of a liquid crystal display panel are repaired according to the present invention, and one pixel of the liquid crystal display panel has green light emitted as shown in FIG. 3A. The region 111 is composed of a region 112 in which blue light is emitted and a region 113 in which red light is emitted.

In this case, when the region 112 in which blue light is emitted is determined to be defective, as shown in FIG. 3B, the region 111 in which green light is emitted, the region 112 in which blue light is emitted, and the region 113 in which red light is emitted, are shown. A repair filter 120 for blocking blue light is positioned in one pixel region, and the pixel is repaired.

That is, the repair filter 120 is a cut filter that blocks light of a specific wavelength.

In the pixel in which the repair filter 120 for filtering the blue light is positioned, green light is emitted in the region 111 in which green light is emitted, and red light is emitted in the region 113 in which red light is emitted, as shown in FIG. 3C. However, the area 112 where blue light is emitted is repaired and represented by a dark spot.

As described above, the reason why the repair filter 120 is installed to the region 111 where the green light is emitted and the region 113 where the red light is emitted, in addition to the region 112 where the blue light to be darkened is emitted, Since the backlight unit located at the bottom of the liquid crystal display panel emits light not at one angle but at all angles, even if it blocks light only in the region where the defect occurs, the viewing angle Because it is not blocked from the side.

On the other hand, the present invention is to provide a repair filter for blocking any one of the green light, blue light and red light in each of the pixels having a bright point of the plurality of pixels of the liquid crystal display panel.

At this time, the entire pixel having the bright point defect is repaired by the repair filter.

Also, in a pixel composed of a region in which green light is emitted, a region in which blue light is emitted, and a region in which red light is emitted, when any one of the regions has a bright point defect, the entire pixel is one of green light, blue light, and red light as a repair filter. By blocking, repair is done.

4A to 4C are graphs for explaining the filter for each wavelength applied by the repair filter applied to the present invention. First, the blue light repair filter is an optical filter that blocks the blue light 201 (FIG. 4A).

The green light repair filter is an optical filter that blocks the green light 202 (FIG. 4B), and the red light repair filter is an optical filter that blocks the red light 203. (FIG. 4C)

Therefore, each of the defective pixel-specific repair filters used in the present invention transmits light of different wavelengths that are not filtered with little effect.

FIG. 5 is a schematic cross-sectional view showing a first embodiment of a repaired liquid crystal display panel according to the present invention, wherein a lower substrate having a plurality of thin film transistors 11, 12, 13 arranged thereon is shown in FIG. 10; First and third color filters 31, 32, and 33 which transmit green light, red light, and blue light, respectively, and are formed at a lower side of the upper substrate 50, and are positioned above the lower substrate 10; The repair filter 60 is formed on the liquid crystal display panel including the liquid crystal material 20 filled between the lower substrate 10 and the upper substrate 50 to repair the defective pixel.

That is, referring to FIG. 5, when the bright spot defect region is a region in which red light is emitted, a lower substrate corresponding to one pixel region including a region in which green light is emitted, a region in which blue light is emitted, and a region in which red light is emitted ( 10) A repair filter 60 for blocking red light is formed below.

Here, the repair filter 60 attaches a repair filter in the form of a film to the lower substrate 10 or forms an evaporated repair filter film using an LCVD process.

Therefore, in the repaired pixel of the liquid crystal display panel, red light is cut, and only green light and blue light are emitted.

The liquid crystal display panel includes a plurality of pixels each consisting of a region in which green light, blue light and red light are transmitted from the first to third color filters, and among the pixels having a bright point defect among the plurality of pixels. The repair filter which cuts off any one of green light, blue light, and red light is formed in the lower substrate lower part.

Meanwhile, pixel electrodes are formed on a lower substrate corresponding to each of the pixels, and a plurality of thin film transistors are provided to switch each of the pixel electrodes, and a common electrode is formed on the upper substrate. .

Since the pixel electrodes and the common electrode are conventional in the liquid crystal display panel, detailed description thereof will be omitted.

FIG. 6 is a schematic cross-sectional view illustrating a state in which a polarizing plate is attached to a lower portion of a repair filter of the liquid crystal display panel of FIG. 5, and as shown in FIG. 5, for repairing under a lower substrate 10 of a liquid crystal display panel. A filter 60 is formed, and a polarizing plate 70 is attached to the repair filter 60 below.

The polarizer 70 is attached to polarize light emitted from the backlight unit under the liquid crystal display panel.

FIG. 7 is a schematic cross-sectional view showing a second embodiment of a repaired liquid crystal display panel according to the present invention. In the case where the unscoring point region is a region in which green light is emitted, a region in which green light is emitted, a region in which blue light is emitted, and a red light A repair filter 61 for blocking green light is formed on the upper substrate 50 corresponding to one pixel area including the emission area.

Therefore, the green light is cut in the repaired pixel of the liquid crystal display panel, and only the red light and the blue light are emitted.

FIG. 8 is a schematic cross-sectional view showing a third embodiment of a repaired liquid crystal display panel according to the present invention, wherein the liquid crystal display panel of the third embodiment has upper and lower portions of the upper substrate 50 corresponding to pixels having a bright point defect. The repair filter 62 is formed in each of the lower portions of the substrate 10.

Therefore, the repair efficiency can be improved by blocking the light of the bright spot defect region in the repair filter 62 formed on the upper substrate 50 and the lower substrate 10 of the liquid crystal display panel, respectively.

In the above-described first to third embodiments of the present invention, the repair filter formed on any one of the lower substrate upper portion, the upper substrate upper portion, and both of them is a repair filter for blocking any one of green light, blue light, and red light.

FIG. 9 is a schematic flowchart illustrating a method of manufacturing a liquid crystal display panel according to the present invention. First, a plurality of pixels each including a region in which green light is emitted, a region in which blue light is emitted, and a region in which red light is emitted are formed. Prepare a liquid crystal display panel (step S10).

The liquid crystal display panel may include a lower substrate on which a plurality of thin film transistors are arranged; First and third color filters configured to transmit green light, red light, and blue light, respectively, and formed at a lower side of the upper substrate, the upper substrate being positioned above the lower substrate; Comprising a liquid crystal material filled between the lower substrate and the upper substrate, each of the pixels consists of a region for emitting green light, blue light and red light transmitted from the first to third color filters.

Thereafter, it is checked whether or not the bright point defects exist in the pixels of the liquid crystal display panel (S20).

In this case, in step S20 of checking whether the bright spot defect is present, if there is a pixel having the bright spot defect, a repair filter is formed in the liquid crystal display panel region corresponding to the pixel to perform the repair process. )

Here, it is preferable that the liquid crystal display panel region in which the repair filter is formed is any one of a lower lower substrate, an upper upper substrate, and both of them.

The repair filter may be formed in a liquid crystal display panel region corresponding to the pixel by attaching the repair filter to one of the lower substrate upper portion, the upper substrate upper portion, and both of them in the form of a pre-made film. It is preferable to form a repair filter film by depositing a repair filter film in any one of a lower board | substrate, an upper board | substrate, and both.

In addition, forming a repair filter on both the lower substrate lower part and the upper substrate upper part or on the lower substrate lower part may include forming a repair filter on an upper part of the polarizing plate, and removing the repair filter on both the lower substrate upper part and the upper substrate upper part. Alternatively, the lower substrate may be attached to the lower substrate.

In addition, after forming the repair filter on the lower substrate, the upper substrate, or the lower substrate, the lower substrate, and further comprising attaching a polarizing plate to the lower portion of the repair filter formed on the lower substrate. Do.

As described above, the present invention has the effect of easily repairing the bright spot defect by forming a repair filter for blocking any one of green light, blue light and red light in the pixel having the bright spot defect.

In addition, the present invention forms a repair filter that can block light of a specific wavelength in addition to a region in which light of a specific wavelength to be darkened is emitted, so that the entire bright pixel has a specific wavelength even at a wide viewing angle. There is an effect that can block the light.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (13)

A lower substrate; An upper substrate positioned above the lower substrate; In a liquid crystal display panel including a liquid crystal material filled between the lower substrate and the upper substrate, and having a plurality of pixels, And a repair filter for blocking any one of green light, blue light, and red light from each of the pixels having a bright point among the plurality of pixels. The method of claim 1, The plurality of pixels, It consists of an area where green light is emitted, an area where blue light is emitted, and an area where red light is emitted. Any one of the green light emitting area, the blue light emitting area and the red light emitting area has a bright point defect, And said repair filter is formed so as to block any one of green light, blue light and red light in the entire pixel having the bright point defect. The method of claim 1, The repair filter, And a lower portion of the lower substrate, an upper portion of the upper substrate, and both of them. A lower substrate; First and third color filters configured to transmit green light, red light, and blue light, respectively, and formed at a lower side of the upper substrate, the upper substrate being positioned above the lower substrate; It comprises a liquid crystal material filled between the lower substrate and the upper substrate, And a plurality of pixels, each of which is composed of a region in which green light, red light, and blue light transmitted from the first to third color filters are emitted. Among the plurality of pixels, a repair filter for blocking light of a specific wavelength in each of the pixels having a bright point is formed on one of the lower substrate, the upper substrate, and both of them. Display panel. The method of claim 4, wherein Between the first to third color filters, A black matrix pattern is formed, The liquid crystal display panel characterized by the above-mentioned. The method of claim 4, wherein In the case where a repair filter is formed on both the lower substrate and the upper substrate, or the lower substrate, And a polarizer further attached to a lower portion of the repair filter formed under the lower substrate. The method of claim 4, wherein The light of the specific wavelength, It is any one of green light, red light, and blue light. Preparing a liquid crystal display panel including a plurality of pixels each formed of a region in which green light is emitted, a region in which blue light is emitted, and a region in which red light is emitted; Checking whether pixels of the liquid crystal display panel have a bright point defect; And performing a repair process by forming a repair filter in a liquid crystal display panel region corresponding to the pixel when there are pixels having the bright point defect. The method of claim 8, The liquid crystal display panel includes a lower substrate on which a plurality of thin film transistors are arranged; First and third color filters configured to transmit green light, red light, and blue light, respectively, and formed at a lower side of the upper substrate, the upper substrate being positioned above the lower substrate; It is composed of a liquid crystal material filled between the lower substrate and the upper substrate, Wherein each of the pixels comprises a region in which green light, red light and blue light transmitted from the first to third color filters are emitted. The method of claim 8, The liquid crystal display panel region in which the repair filter is formed is A lower substrate, an upper substrate, and both of them are any of the above. The method of claim 8, Forming the repair filter in the liquid crystal display panel region corresponding to the pixel, In the form of a pre-made film, a repair filter is attached to the lower substrate upper part, the upper substrate upper part, and both of them, or A method of manufacturing a liquid crystal display panel, characterized by depositing a repair filter film on one of a lower substrate, an upper substrate, and both of them. The method of claim 10, Forming a repair filter on both the lower substrate and the upper substrate, or the lower substrate, A repair filter is formed on the polarizer, and the repair filter is formed by attaching the repair filter to both the lower substrate and the upper substrate or to the lower substrate. The method of claim 10, After forming a repair filter on both the lower substrate and the upper substrate, or the lower substrate, And attaching a polarizing plate to a lower portion of the repair filter formed under the lower substrate.

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