KR20070109631A - Liquid crystal display for medical and method thereof - Google Patents

Abstract

An LCD for a medical purpose and a fabrication method thereof are provided to provide a flat planarization layer without a stepped portion by forming a first planarization layer in a cell area defined by a black matrix by a mask process. A black matrix(132) is formed to define a cell area on an upper substrate(111). A first planarization layer(136a) is formed in the cell area defined by the black matrix and has the same height as the black matrix. A second planarization layer(136b) is formed on an entire surface of the substrate including the black matrix and the first planarization layer. The second planarization layer has a thickness ranging from 0.1mum to 1.5mum. The black matrix includes an inorganic material or an organic material.

Description

Medical liquid crystal display device and manufacturing method therefor {LIQUID CRYSTAL DISPLAY FOR MEDICAL AND METHOD THEREOF}

1 is a perspective view showing a general liquid crystal display device.

Figure 2 is a cross-sectional view showing an upper array substrate of a conventional medical liquid crystal display device.

3 is a cross-sectional view illustrating nonuniformity of a cell gap due to a step of the planarization layer.

Figure 4 is a cross-sectional view showing an upper array substrate of another conventional medical liquid crystal display device.

5 is a perspective view showing a medical liquid crystal display according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating an upper array substrate of the medical liquid crystal display shown in FIG. 5.

7A to 7D are cross-sectional views illustrating a method of manufacturing an upper array substrate of a medical liquid crystal display according to an exemplary embodiment of the present invention.

<Description of Simple Symbols for Major Parts of Drawings>

1, 101: lower substrate 2, 102: gate line

4, 104: data line 11, 111: upper substrate

22, 122: pixel electrode 24, 124: common electrode

26, 126: common line 30, 130: thin film transistor

32, 132: black matrix 34: color filter

36, 136: planarization layer 40, 140: liquid crystal

50, 150: lower array substrate 60, 160: upper array substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical liquid crystal display device, and more particularly, to a medical liquid crystal display device and a method of manufacturing the same, which are capable of removing stains and improving gray uniformity by removing a step of the planarization layer.

A general liquid crystal display device includes a lower array substrate and an upper array substrate facing each other with liquid crystals interposed therebetween.

Referring to FIG. 1, a general liquid crystal display device includes a lower array substrate 50 and an upper array substrate 60 facing each other, and a liquid crystal 40 filled between the two substrates 50 and 60.

The lower array substrate 50 includes a gate line 2 and a data line 4 intersecting on the lower substrate 1, a thin film transistor 30 formed at an intersection of them 2, 4, and a gate line 2. ) And a pixel electrode 22 and a common electrode 24 formed to form a horizontal electric field in a pixel region provided with a cross structure of the data line 4 and a common line 26 connected to the common electrode 24.

The upper array substrate 60 is formed in an area corresponding to the gate line 2 and the data line 4 of the lower array substrate 50 on the upper substrate 11 to partition the cell area and absorb external light. Red (hereinafter, “R”), green (hereinafter, “G”) and blue (hereinafter, “B”) are added to the black matrix 32 and the cell region partitioned by the black matrix 32 to improve contrast. A color filter 34 to implement, and a planarization layer 36 to planarize the upper substrate 11 on which the black matrix 32 and the color filter 34 are formed.

Recently, such a liquid crystal display device is designed as a mono liquid crystal display device in which the R, G, and B color filters 34 are removed from the upper array substrate 60 and applied to X-ray, which is a medical device.

Referring to FIG. 2, an R, G, and B color filter 34 (see FIG. 1) is applied to an upper array substrate 60 of a mono liquid crystal display device which is applied to medical equipment such as X-rays, ultrasonic diagnostic devices, and radioisotope illuminators. ) Is not formed, the black matrix 32 which partitions the cell region and absorbs external light to improve contrast, and the planarization layer 36 for planarizing the upper substrate 11 on which the black matrix 32 is formed. Only is formed. Accordingly, since the black matrix 32 is formed on the planarization layer 36 formed on the upper array substrate 60 of the mono liquid crystal display without the R, G, and B color filters 34 (see FIG. 1), the black matrix 32 is formed. A step d1 is formed at the interface between the portion with) and the portion without the black matrix 32. The step d1 formed on the planarization layer 36 is made of an organic material such as a resin containing photoacryl, rather than the case of forming the black matrix 32 from an inorganic material such as chromium (Cr) or the like. Is formed higher. The step d1 of the planarization layer 36 does not maintain the alignment of the liquid crystal 40 uniformly, causing stains on the medical liquid crystal display device, and stains generated on the medical liquid crystal display device cause misdiagnosis. For example, there is a possibility of staining a benign tumor as a benign tumor.

The medical liquid crystal display device requires a higher cell gap uniformity than a general liquid crystal display device. Referring to FIG. 3, the uniformity of the cell gap indicates uniformity between the upper array substrate 60 and the lower array substrate 50. When the step d1 of the planarization layer 36 becomes large, the medical liquid crystal display device The uniformity of the cell gap is lowered. The decrease in the uniformity of the cell gap is the amount of the liquid crystal 40 located on the upper surface A of the step d1 of the planarization layer 36 and the lower surface B of the step d1 of the planarization layer 36. By varying the light transmittance of the liquid crystal 40 in the upper surface (A) of the step (d1) of the planarization layer 36 and the lower surface (B) of the step (d1) of the planarization layer 36, The color coordinates of the liquid crystal display device are distorted. If the color coordinates of the medical liquid crystal display device are distorted, the gray uniformity of the medical liquid crystal display device is lowered, and the decrease in the gray uniformity also causes a misdiagnosis. For example, different left and right grays in the lungs can be misdiagnosed as abnormalities in the lungs. Therefore, the medical liquid crystal display device imposes more stringent standards such as unevenness and gray uniformity than the general liquid crystal display device.

For this reason, as shown in FIG. 4, another conventional medical liquid crystal display device forms a thickness d2 of the planarization layer 36 by forming a thickness of 1.8 μm or less of the planarization layer 36 to a thickness of 2.0 μm or more. An attempt is made to lower the step d1 of the planarization layer 36 shown in FIG. 2. However, when the planarization layer 36 is formed thick, the brightness of the medical liquid crystal display device is reduced by the planarization layer 36 formed thick. In all liquid crystal display devices including the medical liquid crystal display device, the brightness is also lowered when the brightness thereof is lowered. In addition, since the medical liquid crystal display device requires a higher definition, that is, a higher luminance than a general liquid crystal display device, a method of reducing the level d2 of the planarization layer 36 by forming the planarization layer 36 thicker is a medical liquid crystal display device. It is not desirable to apply to.

Accordingly, it is an object of the present invention to provide a medical liquid crystal display device and a method for manufacturing the same, which can remove stains and improve gray uniformity by removing the step of the planarization layer.

In order to achieve the above object, the medical liquid crystal display device according to an embodiment of the present invention, the upper liquid crystal display device comprising a top array substrate and a lower array substrate facing each other with a liquid crystal between, the upper array substrate is An upper substrate; A black matrix formed to partition a cell region on the upper substrate; A first planarization layer formed at the same height as the black matrix in the cell region partitioned by the black matrix; A second planarization layer is formed on the upper substrate on which the black matrix and the first planarization layer are formed.

The second planarization layer has a thickness of 0.1 ~ 1.5㎛.

The black matrix includes an inorganic material or an organic material.

The lower array substrate may include a lower substrate; A data line and a gate line intersecting each other on the lower substrate; A thin film transistor formed at an intersection of the data line and the gate line; A pixel electrode connected to the thin film transistor; And a common electrode parallel to the pixel electrode.

In the method of manufacturing a liquid crystal display device according to an embodiment of the present invention, in the method of manufacturing a medical liquid crystal display device comprising an upper array substrate and a lower array substrate facing the liquid crystal between, the step of providing an upper array substrate, Forming a black matrix to define a cell region over the upper substrate; Forming a first planarization layer at the same height as the black matrix in the cell region partitioned by the black matrix; And forming a second planarization layer on an entire surface of the upper substrate on which the black matrix and the first planarization layer are formed.

Other objects and advantages of the present invention in addition to the above object will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 5 to 7D.

5 is a perspective view illustrating a medical liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 5, a medical liquid crystal display according to an exemplary embodiment of the present invention includes a lower array substrate 150 and an upper array substrate 160 facing each other, and a liquid crystal 140 filled between two substrates 150 and 160. It is provided.

The lower array substrate 150 may include a gate line 102 and a data line 104 intersecting on the lower substrate 101, a thin film transistor 130 formed at an intersection of them 102 and 104, and a gate line 102. And a pixel electrode 122 and a common electrode 124 formed to form a horizontal electric field in a pixel region provided with a cross structure of the data line 104 and a common line 126 connected to the common electrode 124.

The upper array substrate 160 is formed on the upper substrate 111 by using an inorganic material or an organic material, and is formed in an area corresponding to the gate line 102 and the data line 104 of the lower array substrate 150 to form a cell region. And a black matrix 132 for absorbing external light and improving contrast, and a planarization layer 136 for planarizing the upper substrate 111 on which the black matrix 312 is formed.

The planarization layer 136 of the present invention includes a first planarization layer 136a and a black matrix 132 formed at the same height as the black matrix 132 in a cell region partitioned by the black matrix 132 as shown in FIG. 6. And a second planarization layer 136b formed entirely on the upper substrate 111 on which the first planarization layer 136a is formed. The second planarization layer 136b is formed at a height of 0.5 to 1.5 μm.

As described above, in the medical liquid crystal display of the present invention, the second planarization layer 136b may be formed flat on the upper substrate 111 by the first 136a without a step. Accordingly, in the medical liquid crystal display of the present invention, a step is not formed in the planarization layer 136 including the first and second planarization layers 136a and 136b, thereby preventing the alignment of the liquid crystals 140 (see FIG. 5). The stain of the medical liquid crystal display device can be removed. In the medical liquid crystal display of the present invention, as the planarization layer 136 is formed flat on the upper substrate 111 without a step, the uniformity of the cell gap is improved. Accordingly, the medical liquid crystal display device of the present invention has the same light transmittance of the liquid crystal in all areas, thereby preventing the color coordinates from being distorted. As a result, the gray uniformity of the medical liquid crystal display device is improved.

Hereinafter, a method of manufacturing an upper array substrate of a medical liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 7A to 7D.

Referring to FIG. 7A, in the method of manufacturing a medical liquid crystal display according to an exemplary embodiment of the present invention, a flattening material such as photoacryl is coated on the upper substrate 111 on which the black matrix 132 is formed, and a general liquid crystal display is performed. Photolithography process using a mask for forming the R color filter of the device is partitioned by the black matrix 132 and the same height as the height of the black matrix 132 in the region where the R color filter of the general liquid crystal display is formed. The first planarization layer 136a is formed.

Then, a photolithography process using a mask for applying a planarization material such as photoacryl on the entire surface of the upper substrate 111 on which the first planarization layer 136a is formed and forming a G color filter of a general liquid crystal display device. As shown in FIG. 7B, the first planarization layer 136a having the same height as the height of the black matrix 132 is formed in the region formed by the black matrix 132 and the G color filter of the general liquid crystal display is formed.

Subsequently, a planarizing material such as photoacryl is applied to the entire surface of the upper substrate 111 on which the first planarization layer 136a is formed in a region where the R color filter of the general liquid crystal display is formed. In a photolithography process using a mask for forming a filter, the photolithography process is divided by the black matrix 132 as shown in FIG. The first planarization layer 136a is formed.

In addition, the entire surface of the planarization material such as photoacryl may be coated on the upper substrate 111 on which the first planarization layer 136a is formed in a region where the G color filter of the general liquid crystal display is formed. The second planarization layer 136b is formed to finally complete the planarization layer 136.

As described above, in the method of manufacturing the medical liquid crystal display according to the exemplary embodiment of the present invention, the first planarization layer 136a is disposed in the cell region partitioned by the black matrix 132. It is not necessary to manufacture a new mask for forming the first planarization layer 136a by forming using a mask for forming a. Therefore, the manufacturing method of the medical liquid crystal display of the present invention can reduce the additional cost for forming the first planarization layer 136a.

In addition, in the medical liquid crystal display according to the embodiment of the present invention, since the second planarization 136b is formed at a height of about 0.1 to 1.5 μm, the thickness of the planarization layer 136 may be reduced as compared with a general liquid crystal display. The transmittance of the medical liquid crystal display device can be improved.

As described above, the medical liquid crystal display device and the method of manufacturing the same according to the embodiment of the present invention flatten the planarization layer on the upper substrate by the first planarization layer formed by the mask process on the cell region partitioned by the black matrix. Can be formed. Therefore, the medical liquid crystal display device and the manufacturing method thereof of the present invention can remove the unevenness due to the alignment failure of the liquid crystal because no step is formed in the planarization layer.

In addition, the medical liquid crystal display device and the method of manufacturing the same of the present invention improve the uniformity of the cell gap as the planarization layer is formed flat on the upper substrate without a step. Accordingly, the medical liquid crystal display device of the present invention has the same light transmittance of the liquid crystal in all areas, thereby preventing the color coordinates from being distorted. As a result, the gray uniformity of the medical liquid crystal display device is improved.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (9)

A medical liquid crystal display device comprising an upper array substrate and a lower array substrate facing each other with a liquid crystal interposed therebetween, The upper array substrate, An upper substrate; A black matrix formed to partition a cell region on the upper substrate; A first planarization layer formed at the same height as the black matrix in the cell region partitioned by the black matrix; And a second planarization layer formed on the upper substrate on which the black matrix and the first planarization layer are formed. The method of claim 1, The second planarization layer is a medical liquid crystal display, characterized in that the thickness of 0.1 ~ 1.5㎛. The method of claim 1, The black matrix is a medical liquid crystal display device comprising an inorganic material or an organic material. The method of claim 1, The lower array substrate, A lower substrate; A data line and a gate line intersecting each other on the lower substrate; A thin film transistor formed at an intersection of the data line and the gate line; A pixel electrode connected to the thin film transistor; And a common electrode parallel to the pixel electrode. A method of manufacturing a medical liquid crystal display device comprising an upper array substrate and a lower array substrate facing each other with a liquid crystal interposed therebetween. Preparing the upper array substrate, Forming a black matrix to define a cell region over the upper substrate; Forming a first planarization layer at the same height as the black matrix in the cell region partitioned by the black matrix; And forming a second planarization layer on the entire surface of the upper substrate on which the black matrix and the first planarization layer are formed. The method of claim 5, Forming the first planarization layer, Forming a first planarization layer in a first cell region partitioned by the black matrix by a photolithography process using a mask to form an R color filter; Forming a first planarization layer in a second cell region partitioned by the black matrix by a photolithography process using a mask to form a G color filter; And forming a first planarization layer in a third cell region partitioned by the black matrix by a photolithography process using a mask to form a B color filter. The method of claim 5, The second planarization layer is a manufacturing method of the medical liquid crystal display device, characterized in that formed in a thickness of 0.1 ~ 1.5㎛. The method of claim 5, And the black matrix is made of an inorganic material or an organic material. The method of claim 1, Preparing the lower array substrate, Forming a gate line and a common electrode on the lower substrate; Forming a thin film transistor at a data line crossing the gate line and an intersection of the gate line and the data line; And forming a pixel electrode connected to the thin film transistor and in parallel with the common electrode.

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