KR100968573B1 - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a liquid crystal display device and a manufacturing method thereof. In the method of manufacturing a liquid crystal display according to the present invention, a gate line and a data line are formed on a first glass substrate having a plurality of pixel regions, and first switching is connected to the gate line and the data line in each pixel region. Forming a device, forming a light sensing unit for outputting position information by light applied from the outside, forming a contact unit connected to the first switching device by a roll printing method, and forming a plurality of colors in each pixel area. Forming a color filter and forming a pixel electrode electrically connected to the first switching device through the contact portion to manufacture a first substrate; Forming a second substrate by forming a common electrode on a surface of the second glass substrate facing the first glass substrate; And forming a liquid crystal between the first substrate and the second substrate. As a result, the optical recognition efficiency and optical characteristics of the light sensing unit may be improved, the thickness and display quality may be improved, and the manufacturing process may be simplified and the manufacturing cost may be reduced.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF}

1 is a view conceptually illustrating one region of a liquid crystal display according to the present invention;

2 is a cross-sectional view of a region of a liquid crystal display according to the present invention;

3 is a cross-sectional view of another area of the liquid crystal display according to the present invention;

4A to 4F are views illustrating a manufacturing process of a liquid crystal display according to the present invention.

* Explanation of symbols for the main parts of the drawings

100: first substrate 110: first glass substrate

111: data line 112: gate line

113: first switching element 120: light detector

121: first sensor line 122: second sensor line

123: second switching element 124: third switching element

131,132,133: Color Filter

140: contact portion 150: pixel electrode

160: light blocking pattern 200: second substrate                 

210: second glass substrate 220: common electrode

G1, G2, G3: gate electrode portion S1, S2, S3: source electrode portion

C1, C2, C3: Channel layer D1, D2, D3: Drain electrode part

PA: Pixel Area

The present invention relates to a liquid crystal display device and a method for manufacturing the same, and more particularly, a liquid crystal display device that can improve the optical recognition sensitivity of the light sensing unit, improve the display quality and reliability of the product, reduce the labor and manufacturing cost and It relates to a manufacturing method.

In general, when a touch type image display apparatus selects an instruction content displayed on a screen using a human hand or an object, information corresponding to the selected instruction content is displayed on the screen. In such a touch type image display device, since a bulky input device such as a keyboard and a mouse is not provided, it is recently used as a display device of a portable information terminal.

The touch type image display apparatus includes a liquid crystal display panel displaying an image and a touch panel detecting a position of an instruction selected by a user.

The liquid crystal display panel includes a first substrate and a second substrate disposed to face each other, and a liquid crystal interposed between the first substrate and the second substrate.

A plurality of pixel areas defined by data lines and gate lines are formed on the first substrate, and each pixel area is provided with a switching element such as a thin film transistor connected to the data line and the gate line. The switching element is electrically connected to the pixel electrode disposed with the switching element and the insulating layer interposed therebetween. In forming the insulating layer, a switching hole is formed through the masking technique to expose the switching element to the outside, and the pixel electrode is coated thereon. The switching element and the pixel electrode are connected.

The second substrate is formed on a matrix corresponding to the switching element, the data line, and the gate line to block light, a color filter formed on the portion corresponding to the pixel electrode, and a front surface of the second substrate. It includes a common electrode.

The touch panel is stacked on the display surface of the liquid crystal display panel in which an image is displayed. The touch panel includes a first substrate, a second substrate spaced apart from the first substrate by a predetermined distance, and a first transparent electrode and a second transparent electrode respectively formed on surfaces where the first and second substrates face each other.

When the touch panel is laminated on the liquid crystal display panel configured as described above, air is present between the liquid crystal display panel and the touch panel, and the optical characteristics of the touch type image display apparatus are degraded due to the air. Then, the thickness of the touch type image display apparatus becomes thick, and the price also increases.

In addition, in the conventional liquid crystal display panel, since the gap between the pixel electrode and the signal line is widened to reduce the capacitance of the parasitic capacitor generated between the pixel electrode and the signal line, the aperture ratio of the pixel region is reduced, so that the resolution of the liquid crystal display panel is reduced. Is lowered.

In addition, when the first substrate and the second substrate of the liquid crystal display panel are attached, it is difficult to exactly match the black matrix, the switching element, the data line, and the gate line, causing a lot of misalignment. Have

In addition, in the process of forming a contact hole in the insulating film to connect the switching element and the pixel electrode, an expensive mask, an exposure machine, and a developing device are used, whereby the manufacturing process is complicated and the manufacturing cost increases.

Accordingly, an object of the present invention is to provide a liquid crystal display device and a method for manufacturing the same, which can improve the optical recognition efficiency and optical characteristics of the light sensing unit, improve the thickness and display quality, and simplify the manufacturing process and reduce the manufacturing cost. To provide.

The above object is, according to the present invention, in a method of manufacturing a liquid crystal display device, forming a gate line and a data line on a first glass substrate having a plurality of pixel regions, wherein the gate line and the data are formed in each pixel region. Forming a first switching device connected to the line, forming a light sensing unit for outputting position information by light applied from the outside, forming a contact unit connected to the first switching device by a roll printing method, and Manufacturing a first substrate by forming a color filter having a plurality of colors in each pixel region, and forming a pixel electrode electrically connected to the first switching device through the contact portion; Forming a second substrate by forming a common electrode on a surface of the second glass substrate facing the first glass substrate; It can be achieved by a method of manufacturing a liquid crystal display device comprising the step of forming a liquid crystal between the first substrate and the second substrate.

The forming of the light sensing unit in the forming of the first substrate may include forming a first sensor line and a second sensor line; And forming a second switching device driven by the light and a third switching device for outputting a signal output from the second switching device to the second sensor line.

In addition, each color filter in the step of manufacturing the first substrate may be formed by a roll printing method.

The manufacturing of the first substrate may further include forming a black matrix by a roll printing method.

Here, the manufacturing of the second substrate may further include forming a black matrix by a roll printing method.

The contact part may be formed of a contact material including a conductive paste and a resin, and the contact material may further include a Ni-Au plated ball.

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

As shown in FIGS. 1 and 3, the liquid crystal display according to the present invention includes a first substrate 100, a second substrate 200, and a liquid crystal 300.                     

The first substrate 100 includes a first glass substrate 110, a data line 111 and a gate line 112, switching elements provided in each pixel area PA, a light sensing unit 120, and a color filter. (131, 132, 133).

The first glass substrate 110 is a transparent glass substrate having a high light transmittance and has a plurality of pixel areas PA. The pixel area PA means a basic unit area necessary for displaying an image. For example, when the resolution of the liquid crystal display device is 1024 × 768, 1024 × 768 × 3 pixel areas PA are formed in the first glass substrate 110. Here, light passing through each pixel area PA is combined in a mosaic form, and a user recognizes an image by light passing through each pixel area PA.

The gate line 112, the data line 111, and the first switching device 113 are formed in each pixel area PA.

The gate line 112 extends in the first direction from the first glass substrate 110 and is formed inward of the pixel area PA. The data line 111 extends in the second direction perpendicular to the first direction on the first glass substrate 110 and is formed between the pixel areas PA. Here, when the resolution of the liquid crystal display device is 1024 × 768, 768 gate lines 112 are formed side by side on the first glass substrate 110, and the data lines 111 are 1024 on the first glass substrate 110. × 3 pieces are formed side by side.

The first switching element 113, for example, a thin film transistor (TFT), is formed in an area where the gate line 112 and the data line cross each other in the pixel area PA. The first switching device 113 includes a gate electrode part G1, a channel layer C1, a source electrode part S1, and a drain electrode part D1. The gate electrode part G1 extends from the gate line 112 to each pixel area PA along the second direction. The channel layer C1 is disposed on the top surface of the gate electrode part G1 in an insulated state from the gate electrode part G1. A channel layer (C1) is preferably formed by an amorphous silicon thin film (amophous silicon film) and an n ⁺ amorphous silicon thin film (n ⁺ amophous silicon film) disposed on the upper surface of the amorphous silicon thin film. The n ⁺ amorphous silicon thin film is formed in two parts on the surface of the amorphous silicon thin film. One source electrode part S1 extends from each data line 111 toward each pixel area PA. Each source electrode portion S1 is in contact with one of the n ⁺ amorphous silicon thin films divided into two. The drain electrode part D1 is in contact with the other one of the n ⁺ amorphous silicon thin films divided into two.

The light sensing unit 120 includes a first sensor line 121, a second sensor line 122, and sensing elements 123 and 124.

The first sensor line 121 extends in the second direction of the first glass substrate 110 inside the pixel area PA. The first sensor line 121 is formed on the same layer as the data line 111 and electrically insulated from the data line by a predetermined distance.

The second sensor line 122 extends along the first direction of the first glass substrate 110 between the pixel areas PA. The second sensor line 122 is formed on the same layer as the gate line 112, and is electrically insulated from the gate line 112 by a predetermined interval.

The sensing elements 123 and 124 are formed only in some pixel areas PA selected from among the plurality of pixel areas PA, and the first sensor line 121 outputs a signal having position information in response to light applied from the outside of the liquid crystal display. ) The sensing elements 123 and 124 include a second switching element 123 and a third switching element 124, and like the first switching element 113, the sensing elements 123 and 124 may be thin film transistors.

The second switching device 123 reacts to light provided from the outside and includes a gate electrode part G2, a channel layer C2, a source electrode part S2, and a drain electrode part D2.

The gate electrode part G2 extends from the second sensor line 122 to each pixel area PA along the second direction. The channel layer C2 is disposed on the top surface of the gate electrode part G2 in an insulated state from the gate electrode part G2. A channel layer (C2) is preferably made of an amorphous silicon thin film (amophous silicon film) and an n ⁺ amorphous silicon thin film (n ⁺ amophous silicon film) disposed on the upper surface of the amorphous silicon thin film. The n ⁺ amorphous silicon thin film is formed in two parts on the surface of the amorphous silicon thin film. The amorphous silicon thin film and the n ⁺ amorphous silicon thin film convert the light applied from the outside into electrical energy to connect the second switching element 123. The source electrode part S2 extends from the data line 111 toward the pixel area PA. Each source electrode portion S2 is in contact with one of the n ⁺ amorphous silicon thin films divided into two. The drain electrode part D2 is in contact with the other one of the n ⁺ amorphous silicon thin films divided into two, and extends in the direction in which the third switching element 124 is formed.

The third switching element 124 includes a gate electrode portion G3, a channel layer C3, a source electrode portion S3, and a drain electrode portion D3.

The gate electrode part G3 extends from the gate line 112 to each pixel area PA along the second direction. The channel layer C3 is disposed on the top surface of the gate electrode part G3 in an insulated state from the gate electrode part G3. A channel layer (C3) is preferably made of an amorphous silicon thin film (amophous silicon film) and an n ⁺ amorphous silicon thin film (n ⁺ amophous silicon film) disposed on the upper surface of the amorphous silicon thin film. The n ⁺ amorphous silicon thin film is formed in two parts on the surface of the amorphous silicon thin film. The source electrode part S3 extends in the direction in which the second switching element 123 is formed and is connected to the drain electrode part D2 of the second switching element 123. The source electrode portion S3 is in contact with one of the n ⁺ amorphous silicon thin films divided into two. The drain electrode part D3 contacts the other one of the n ⁺ amorphous silicon thin films divided into two and extends from the first sensor line 121 to the pixel area PA along the first direction.

The channel layer C2 formed on the second switching element 123 has the best optical recognition efficiency with respect to the red wavelength. Accordingly, the sensing elements 123 and 124 may be used only in the pixel area PA selected from among the pixel areas PA in which the red color filter 131 is to be formed among the color filters 131, 132, and 133 to be described later. Is preferably formed.

The color filters 131, 132, and 133 are formed in each pixel area PA, and a black matrix (see FIGS. 4A to 4F) is provided between the color filters 131, 132, and 133 to block light leaking between the pixel areas PA. Is formed. Here, when the edges of the color filters 131, 132, 133 overlap each other between the pixel areas PA, the overlapped areas block light leakage between the pixel areas PA. In this case, a separate black matrix is used. There is no need to form a.

The color filters 131, 132, and 133 include a red color filter 131, a green color filter 132, and a blue color filter 133. The red color filter 131 includes a material that transmits light of a red wavelength, the green color filter 132 includes a material that passes light of a green wavelength, and the blue color filter 133 receives light of a blue wavelength. Contains the material to pass. Here, the n-th (where n is a natural number) pixel area PA of each pixel area PA includes a red color filter 131, and the n + 1 th pixel area PA is a green color filter ( 132, and the n + 2 th pixel area PA includes a blue color filter 133.

The pixel electrode 150 is formed in the pixel area PA and is disposed on the top surfaces of the color filters 131, 132, and 133. The pixel electrode is made of a transparent and conductive indium tin oxide (ITO) pattern or indium zinc oxide (IZO) pattern.

The pixel electrode 150 is connected to the drain electrode portion D1 of the first switching element 113 through the contact portion 140 to receive a driving voltage from the first switching element 113. The contact unit 140 according to the present invention is formed by a roll printing method in a step before forming the color filters 131, 132, and 133. Here, the roll printing method is a method in which film formation and patterning are simultaneously performed by pattern-coating a material for forming a film on a substrate on the surface of a printing roll, and then rotating the printing roll at a predetermined pressure and speed on the first glass substrate. to be. In addition, the roll printing method gives a positive or negative property to the print material and gives the opposite polarity to the surface to be printed in order to improve the adhesion of the print material and the accuracy of pattern formation. It is possible to transfer the printing material by.

Here, the contact unit 140 may be a contact material formed by mixing a conductive paste such as silver paste and a resin, or by mixing a nickel-gold plated ball and a resin. It is formed by printing on the drain electrode portion D1 of the first switching element 113 by a roll printing method.

The light blocking pattern 160 is formed on the pixel electrode 150 and is made of aluminum-neodymium (Al-Nd) having high reflectance. The light blocking pattern 160 includes a data line 111, a gate line 112, a first switching element 113, a first sensor line 121, a second sensor line 122, and a third switching element 124. Covering a portion corresponding to and blocks the light leakage from the first substrate 100 toward the second substrate 200, the first switching device 113 and the third switching device 124 intentionally from the outside Prevents reaction to light provided. In the portion where the second switching element 123 and the pixel electrode 150 are formed, the light blocking pattern 160 is opened to allow light incident to the pixel area PA to pass therethrough, and light deliberately provided by the user It can be applied to the second switching device (123).

The second substrate 200 includes a second glass substrate 210 and a common electrode 220. The common electrode 220 is formed over the entire surface of the second glass substrate 210 and is made of ITO or IZO.

The first substrate 100 and the second substrate 200 are coupled by a sealing member (not shown) such that the pixel electrode 150 and the common electrode 220 face each other.

The liquid crystal 300 is disposed between the combined first substrate 100 and the second substrate 200, and the arrangement of the liquid crystal 300 is changed by a potential difference formed between the pixel electrode 150 and the common electrode 220.

In the liquid crystal display according to the present invention, the data line 111, the gate line 112, the first switching element 113, the color filters 131, 132, and 133 are formed on the first substrate 100 including the pixel area PA. The first substrate 100 and the second substrate 200 are formed by forming the sensing unit 120, the pixel electrode 150, and the light blocking pattern 160, and forming only the common electrode 220 on the second substrate 200. ) Can be easily combined, and the reliability of the product due to misalignment can be prevented from being lowered.

In addition, because the color filters 131, 132, and 133 formed in the pixel area PA are separated from the gate line 112, the data line 111, and the pixel electrode 150, the opening area of the pixel area PA becomes wider. The resolution is better than that in the conventional touch type image display apparatus.

In the liquid crystal display according to the present invention, since the light sensing unit 120 for outputting the position information signal is formed inside the liquid crystal display panel by the light applied from the outside, the conventional touch type image display apparatus. Compared to the optical properties, the thickness can be reduced and the manufacturing cost can be reduced. In addition, since the light detector 120 is formed only in the pixel area PA in which the red color filter 131 is provided, the light recognition sensitivity of the light detector 120 may be improved.                     

Meanwhile, a method of manufacturing a liquid crystal display device according to the present invention will be described with reference to FIGS. 4A to 4F.

First, a gate line 112, a data line 111, and a first switching device 113 are formed on a first glass substrate. Here, in the process of forming the gate line 112, the first sensor line 121 of the light sensing unit 120 is formed together, and the second of the light sensing unit 120 is formed in the process of forming the data line 111. The sensor line 122 is formed together, and in the process of forming the first switching device 113, the second switching device 123 and the third switching device 124 of the light sensing unit 120 are formed together. Areas A of FIGS. 4A to 4F schematically illustrate regions in which the gate line 112, the data line 111, the first switching device 113, and the light sensing unit 120 are formed to facilitate understanding of the present disclosure. 4A to 4F schematically illustrate the drain electrode portion D1 of the first switching device 113.

Then, a black matrix is formed on the first glass substrate 110. The black matrix according to the present invention is preferably printed by a roll printing method, and a general mask technique may be applied.

Next, the contact portion 140 is printed on the drain electrode portion D1 of the first switching element 113. The contact unit 140 according to the present invention is printed by the above-described roll printing method.

Next, color filters 131, 132, and 133 are applied to each pixel area PA. The color filters 131, 132, and 133 according to the present invention may be printed in each pixel area PA by a roll printing method. In this case, the contact unit 140 may be maintained in a state where one end thereof is exposed to the outside even after the color filters 131, 132, and 133 are applied.                     

Next, the upper surfaces of the black matrix, the color filters 131, 132, 133, and the contact unit 140 are flattened by rollers (not shown) that abide at a predetermined pressure and speed, and then the pixel electrodes 150 are disposed on the color filters 131, 132, 133. To form. Here, the pixel electrode 150 is connected to the contact unit 140 exposed to the outside on the color filters 131, 132, and 133, thereby being connected to the first switching device 113.

Then, the first substrate 100 is manufactured by forming the light blocking pattern 160 on the pixel electrode 150.

Then, the second substrate 200 is manufactured by forming the common electrode 220 on the first glass substrate 110, the first substrate 100 and the second substrate 200 are combined, and then the first substrate. By injecting and sealing the liquid crystal 300 between the 100 and the first substrate 100, the liquid crystal 300 display panel is manufactured, and the process is performed by assembling a backlight unit, mounting a PCB and a drive IC, not shown. The liquid crystal display device is manufactured.

In the above-described embodiment, the black matrix is formed on the first glass substrate 110 as an example, but forming the black matrix on the second glass substrate 210 may have the same effect.

As such, by forming the contact portion 140 and the color filters 131, 132, and 133 on the first glass substrate 110 by the roll printing method, the manufacturing process is simplified and manufacturing cost, as compared with the conventional mask method. Can be reduced.

As described above, according to the present invention, a liquid crystal display and a liquid crystal display capable of improving the optical recognition efficiency and optical characteristics of the optical sensing unit, improving the thickness and display quality, and simplifying the manufacturing process and reducing the manufacturing cost. A manufacturing method is provided.

Claims (8)

In the manufacturing method of the liquid crystal display device, Forming a gate line and a data line on a first glass substrate having a plurality of pixel regions, forming a first switching element connected to the gate line and the data line in each pixel region, and A light sensing unit for outputting position information, a contact unit connected to the first switching device by a roll printing method, a color filter having a plurality of colors in each pixel area, and the contact unit Manufacturing a first substrate by forming a pixel electrode electrically connected to the first switching element; Forming a second substrate by forming a common electrode on a surface of the second glass substrate facing the first glass substrate; Forming a liquid crystal between the first substrate and the second substrate, And the contact portion is formed of a contact material including a conductive paste and a resin. The method of claim 1, The forming of the light sensing unit in the forming of the first substrate may include: Forming a first sensor line and a second sensor line; And forming a second switching device driven by the light and a third switching device for outputting a signal output from the second switching device to the second sensor line. Manufacturing method. The method of claim 1, Wherein each of the color filters in the step of manufacturing the first substrate is formed by a roll printing method. The method of claim 1, The step of manufacturing the first substrate, Forming a black matrix by a roll printing method further comprising the step of manufacturing a liquid crystal display device. The method of claim 1, The step of manufacturing the second substrate, Forming a black matrix by a roll printing method further comprising the step of manufacturing a liquid crystal display device. delete The method of claim 1, The contact material further comprises a Ni-Au plated ball manufacturing method of the liquid crystal display device. A liquid crystal display device manufactured by the manufacturing method according to any one of claims 1 to 5.

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