KR102466453B1 - Display Device - Google Patents

Abstract

According to the present invention, the printing start point of the third white layer among the plurality of white layers is printed from the outside of the printing end point of the black ink layer, so that the ink layer does not increase in the bezel area by adjusting the spacing to the extent that the different color defects cannot be distinguished with the naked eye. A display device capable of printing data and realizing a bezel area to which a color or a design pattern is applied is provided.

Description

Display Device

The present invention relates to a display device capable of realizing a bezel area of a cover glass in various colors.

In the recent information society, the importance of a display (or a display device) as a visual information delivery medium is further emphasized. have to do

Display is a cathode ray tube (CRT) that emits light by itself, electro luminescence (EL), light emitting diode (LED), vacuum fluorescent display (VFD), field emission A display (Field Emission Display; FED), a plasma display panel (PDP), such as a light-emitting type, such as a liquid crystal display (LCD) can be divided into a non-emission type that does not emit light itself.

Among these various displays, the liquid crystal display is a device that expresses an image by using the optical anisotropy of liquid crystal, and has excellent visibility compared to conventional CRTs, and has smaller average power consumption compared to CRTs with the same screen size as well as low heat dissipation. It is in the spotlight as a display device.

Such a display device includes a liquid crystal display device that implements an image by controlling the transmittance of light generated from the light source by placing a light source under the liquid crystal and applying an electric field to the liquid crystal to control the arrangement of the liquid crystal, and an OLED panel that emits light A lot of organic light emitting display devices using this are applied, and it is applied to various electronic equipment such as smartphones, tablet PCs, and laptops.

However, in the case of a portable device or a display panel to which a touch panel to which a relatively large amount of impact is applied, a cover glass is attached to the upper surface of such a display device to protect it from impact. In addition, various colors can be applied to the cover glass in consideration of the color or design of the display device. In order to realize various colors, assembly defects or bubble defects may occur due to the increase in the height of the ink layer, and also the thickness of the display device The problem of thickening has been raised.

In FIG. 1, which has been improved to improve the occurrence of mark defects due to the vertical stacking of ink layers, the occurrence of bubbles is reduced by stacking a plurality of ink layers in a step shape in a conventional display device.

Referring to FIG. 1 , in the conventional display device, a black ink layer 11 is printed on the back surface of a cover glass 1 , a plurality of white ink layers 21 are printed thereon, and shielding ink is formed on the white ink layer 21 . Layer 31 is printed. In this case, the shape of the final shielding ink layer 31 is formed in a step shape, so that it is possible to reduce the generation of air bubbles in the process of attaching the optical adhesive.

However, such a conventional display device has a problem in that a dichroic defect occurs in a partial area A1 from the printing end point of the black ink layer toward the outside of the white ink layer. In addition, if the width of the black ink layer is increased to prevent such dichroism defects, the bezel area, which is the biggest issue in the prior art, increases again.

The present invention is to solve such a problem, and more specifically, by adjusting the arrangement position of the ink layer printed in a plurality of layers on the back surface of the cover glass, it is possible to prevent an increase in the bezel and improve the color defect. An object of the present invention is to provide a display device.

Another object of the present invention is to provide a display device that is improved so that a dichroic defect cannot be checked with the naked eye by adjusting the printing interval of some layers of the white ink layer composed of a plurality of layers.

In order to solve the above problems, the present invention provides a display device in which the printing start point of the third white layer among the plurality of white layers is printed from the outside of the printing end point of the black ink layer, so that the dichroic defect cannot be visually confirmed.

In addition, the present invention can print the ink layers in a range in which the bezel area does not increase by spacing the white ink layer from the printing line by a set interval, but adjusting the interval to a degree that is indistinguishable to the naked eye, and also applies a color or design pattern. A display device capable of realizing a bezel area is provided.

According to the display device of the present invention, it is possible to prevent dichroic defects by adjusting the spacing within a range that does not increase the height or width of the black ink layer, the white ink layer, and the shielding ink layer, and it is possible to reduce the defect rate by minimizing the bubble defect. , there is an effect that the bezel area to which a color or design pattern is applied can be realized by adjusting the arrangement position of the ink layer.

1 is a cross-sectional view illustrating a display device to which a conventional step-shaped ink layer is applied.
2 is an exploded perspective view showing the display device according to an embodiment of the present invention in isolation.
Fig. 3 is a rear view showing the back surface of the cover glass of the display device shown in Fig. 2;
FIG. 4 is a reference diagram sequentially illustrating the order in which ink layers are printed on the back surface of the cover glass of the display device shown in FIG. 2 .
FIG. 5 is a reference view showing the ink layers printed on the back surface of the cover glass shown in FIG. 4 so that a set interval away from the printing line can be confirmed.

Hereinafter, preferred embodiments of the present invention will be described so that those of ordinary skill in the art can easily implement them with reference to the accompanying drawings. It should be noted that the reference numbers indicated on the components in the accompanying drawings use the same reference numbers as much as possible when indicating the same components in other drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, certain features presented in the drawings are enlarged, reduced, or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily appreciate these details.

2 is an exploded perspective view showing the display device according to an embodiment of the present invention in isolation.

Referring to FIG. 2 , a display device 100 according to an embodiment of the present invention includes a cover glass 110 , a liquid crystal panel 120 , a guide panel 130 , a backlight unit 140 , and a flexible printed circuit. It includes a substrate 150 and a cover bottom 160 . Hereinafter, the application of the display device 100 to a droplet display device (LCD) will be described as an example, and of course, it may be applied to an organic light emitting display device (OLED).

First, the cover glass 110 may be provided with a protective film (not shown) on the upper surface. In addition, the cover glass 110 may include a touch panel (not shown). In such a touch panel, a pressure-sensitive type that detects the position as coordinates when pressure is applied by densely installing sensor strings that respond to pressure applied to the surface, and a touch panel after charging an electric charge on the surface of the cover glass 110 and installing sensors around it It can be applied as an electrostatic method that detects the extent of the loss of electric charge at the time of operation and identifies where the contact was made.

The liquid crystal panel 120 includes a color filter substrate 121 in which pixels are arranged in a matrix to output an image, and a color filter substrate 121 facing each other to maintain a uniform cell gap, an array substrate 122 and a color filter substrate 121 . and a liquid crystal layer (not shown) formed in a cell gap between the array substrate 122 and the array substrate 122 . Of course, a common electrode and a pixel electrode are formed in the liquid crystal panel 120 to which the color filter substrate 121 and the array substrate 122 are bonded, and an electric field is applied to the liquid crystal layer. When the voltage of the applied data signal is controlled, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode, thereby transmitting or blocking light for each pixel to display text or images.

At this time, in order to control the voltage of the data signal applied to the pixel electrode for each pixel, a switching element such as a thin film transistor (TFT) is individually provided in the pixels.

That is, the array substrate 122 has gate lines and data lines arranged vertically and horizontally to define a pixel region, and a thin film transistor, which is a switching element, is formed in an intersection region of the gate line and the data line.

The thin film transistor includes a gate electrode connected to a gate line, a source electrode connected to a data line, and a drain electrode connected to a pixel electrode.

The color filter substrate 121 is a color filter composed of a plurality of sub-color filters that implement colors of red, green, and blue (RGB), and a black that separates the sub-color filters and blocks light passing through the liquid crystal layer. It may include a matrix, and an overcoat layer formed on the color filter and the black matrix.

A polarizing plate is attached to the outside of the color filter substrate 121 and the array substrate 122, respectively. At this time, the lower polarizing plate polarizes the light passing through the backlight unit 140 toward the array substrate 122, and the upper polarizing plate is the liquid crystal panel. The light passing through (120) is polarized.

And between the cover glass 110 and the liquid crystal panel 120, an optical pressure-sensitive adhesive 10 for increasing the brightness is provided. In addition, the lower edge of the liquid crystal panel 120 is supported by the guide panel 130 , and the backlight unit 140 is accommodated in the guide panel 130 .

In addition, the backlight unit 140 includes a light guide plate 141 disposed under the liquid crystal panel 120, an LED module 142 provided with a plurality of light sources disposed on one side of the light guide plate 141 to generate light, and a light guide plate ( 141) including a reflector provided on the rear surface. Here, the LED module 142 of the backlight unit 140 is disposed on one side of the light guide plate 141 .

A plurality of optical sheets 144 for irradiating the liquid crystal panel 120 by improving the efficiency of light emitted from the light guide plate 141 are provided on the upper surface of the light guide plate 141 . Of course, the present invention is not limited to the structure of the backlight unit 140 described above, and any structure of the backlight unit 140 may be applied to the display apparatus 100 according to the present invention.

The light guide plate 141 receives light from the light source and guides the light toward the liquid crystal panel 120 . The light guide plate 141 may be made of a transparent plastic material such as PMMA or PC.

The reflective plate is positioned between the cover bottom 160 and the rear surface of the light guide plate 141 . The reflector reflects the light emitted from the light source and the light reflected from the light guide plate 141 in the direction of the liquid crystal panel 120 . The light emitted from the light source is incident on the side of the light guide plate 141 made of a transparent material, and the reflector disposed on the rear surface of the light guide plate 141 transmits light transmitted through the rear surface of the light guide plate 141 to the optical sheets on the upper surface of the light guide plate 141 ( 144) direction to reduce light loss and improve luminance uniformity.

In this case, the optical sheets 144 include a diffusion sheet 145 and a prism sheet 146 , and a brightness enhancement film 147 such as DBEF and a protective sheet (not shown) may be added. The optical sheets 144 may be provided between the upper surface of the light guide plate 141 and the rear surface of the liquid crystal panel 120 . The backlight unit 140 having such a structure is accommodated in the cover bottom 160 .

FIG. 3 is a rear view showing the back surface of the cover glass of the display device shown in FIG. 2 , FIG. 4 is a reference view showing a state in which an ink layer is printed on the back surface of the cover glass of the display device shown in FIG. 2 , and FIG. 5 is It is a reference diagram showing the ink layers printed on the back surface of the cover glass shown in FIG. 4 so that a set interval away from the printing line can be confirmed.

3 to 5 , the display apparatus 100 according to an embodiment of the present invention is disposed on the outside of the active area A/A and the active area A/A on the rear surface of the cover glass 110 . A black ink layer 1111 printed outward of the printing line 111 using the printing line 111 as a starting point between the bezel areas B/A, and a white ink layer printed on the black ink layer 1111 1121, a shielding ink layer 1131 printed on the white ink layer 1121, and an optical adhesive 10 attached to partially overlap the shielding ink layer 1131 together with the back surface of the cover glass 110 includes

Here, the active area A/A corresponds to an image display area, and the bezel area B/A corresponds to a non-display area and a printing area on which an ink layer implementing the color of the bezel is printed. Of course, when divided into print areas, the active area (A/A) corresponds to an unprinted area.

First, the black ink layer 1111 is printed outward along the printing line 111 on the back surface of the cover glass 110 . The starting point of the black ink layer 1111 is the starting point of the bezel area B/A, and the starting point is the printing line 111 . Of course, the print line 111 corresponds to a reference point that separates the active area A/A and the bezel area B/A.

In addition, since the black ink layer 1111 has a relatively high viscosity, black ink is applied to the starting point of the printing line 111 . Accordingly, it is possible to construct the printing line 111 that is more uniform and has a high straightness.

Here, the straightness is applied because the case where the active area A/A has a rectangular shape is described as an example, and in the case of the active area A/A has a circular shape (not shown), it has a certain curvature. A black ink layer 1111 may be printed.

A plurality of white ink layers 1121 are disposed on the black ink layer 1111 . The white ink layer 1121 is sequentially stacked from the first white layer 1122 to the third white layer 1124 .

First, the first white layer 1122 overlaps from about the central portion of the black ink layer 1111 and is printed to the outer portion of the cover glass 110 . Here, the first white layer 1122 is named to express color contrast with the black ink layer 1111 and may be printed in a different color.

The height of the first white layer 1122 is in the same range as that of the black ink layer 1111 . When the height of the first white layer 1122 increases, the color displayed on the upper surface of the cover glass 110 is expressed clearly or darkly. A lot of bubbles may be generated. Therefore, the white ink layer 1121 is printed a plurality of times to have an appropriate height. In addition, in order to reduce the occurrence of air bubbles, the white ink layer 1121 is printed so that the first white layer 1122 and the second white layer 1123 are formed as layers. Accordingly, the first white layer 1122 is printed to overlap about half of the black ink layer 1111 , and the second white layer 1123 is printed to overlap a smaller portion than the first white layer 1122 . Here, a portion in which the second white layer 1123 overlaps the black ink layer 1111 is described as an example, and it goes without saying that the second white layer 1123 may be printed so that it overlaps less or does not overlap at all. In this case, the first white layer 1122 is disposed to be spaced apart from the print line 111 by a first set interval.

The second white layer 1123 is disposed to be spaced apart from the print line 111 by a second set interval, and the second set interval is greater than the first set interval. Accordingly, since the second white layer 1123 is printed in the outer direction on the first white layer 1122 , the area overlapping the black ink layer 1111 may be formed at least less or may not be formed compared to the first white layer 1122 . have.

The third white layer 1124 is printed in a more outward direction than the second white layer 1123 so as not to overlap the black ink layer 1111 . Here, the third white layer 1124 is printed outward to be spaced apart from the print line 111 by a third set interval, and the third set interval is greater than the second set interval. Of course, since the third white layer 1124 does not overlap the black ink layer 1111 , the third set interval is greater than the width of the black ink layer 1111 . In other words, the third white layer 1124 is printed from the outside of the printing end point of the black ink layer 1111 .

A fourth white layer (not shown) may be selectively printed on the third white layer 1124 according to the degree of color expression on the white ink layer 1121 , and when the color expression is insufficient, additionally a fifth white layer (not shown) C) or more ink layers may be further provided.

And finally, the shielding ink layer 1131 is spaced apart from the printing line 111 by a fourth set interval and printed outward. In this case, the fourth set interval is larger than the first set interval and smaller than the second set interval.

The shielding ink layer 1131 prevents light leakage into the white ink layer 1121 and provides a function of helping the expression of the color of the white ink layer 1121 . Therefore, the shielding ink layer 1131 may be printed with the same paint as the black ink layer 1111 , and preferably printed in a dark color to prevent light from passing through at least the white ink layer 1121 . .

An additional ink layer 1125 is provided outside the black ink layer 1111 between the rear surface of the cover glass 110 and the first white layer 1122 . The additional ink layer 1125 is disposed to be spaced apart from the portion where the printing of the black ink layer 1111 is finished by a set offset interval. A color pattern of various colors or a design pattern is applied to the additional ink layer 1125 . Of course, the additional ink layer 1125 may be printed in the same white color as the white ink layer 1121 . When the additional ink layer 1125 is applied in this way, various colors or designs are applied to the bezel area B/A of the cover glass 110 to respond to various user tastes, and also to meet the needs of users with unique or unique personalities. There is a matching effect.

The optical adhesive 10 is attached by a direct bonding method. OCA, OCR, etc. may be applied to the optical adhesive 10 , and attachment is performed in a vacuum state, and a defoaming process is additionally performed after attachment is completed. Therefore, when the defoaming process is further progressed, the bubbles existing between the respective ink layers and the optical pressure-sensitive adhesive 10 are released while the vacuum is released, thereby remarkably reducing the bubble defect.

As shown in FIG. 5 , the white ink layers 1121 are disposed to be spaced apart from each other at different set intervals.

When the intervals are arranged in the order of the smallest, the smallest first set interval, the fourth set interval, the second set interval, and the third set interval are in order. Of course, if the offset interval is included, the offset interval corresponds to the smallest interval.

Although arranged at different intervals in this way, the third white layer 1124 is printed outwardly spaced apart by about 0.05 to 0.15 mm from the printing end point of the black ink layer 1111 . More preferably, it is preferable to print to be spaced apart by about 0.1 mm. This is based on the fact that even if the black ink layer 1111 is spaced outward by about 0.05 to 0.15 mm through numerous repeated experiments, the size of the spaced interval is insignificant, so that the user cannot visually distinguish it, and different colors are not distinguished. It is possible to solve the color defect without increasing the size of the bezel area (B/A). Here, the third set interval of the third white layer 1124 is preferably made in the range of 0.5 to 0.6 mm, and the starting point of the third white layer 1124 is designed to be located within the offset interval according to the third set interval.

In addition, the white ink layer 1121 has the effect of smoothly discharging air bubbles because each white layer is printed and laminated in a step shape, and the remaining air bubbles through the defoaming process can be discharged at the same time as the vacuum is released, thereby reducing bubble defects. can be reduced.

Therefore, according to the display device of the present invention, it is possible to prevent dichroic defects by adjusting the spacing within a range that does not increase the height or width of the black ink layer, the white ink layer, and the shielding ink layer, and it is possible to reduce the defect rate by minimizing the bubble defect. There is an effect that the bezel area to which a color or design pattern is applied can be realized by adjusting the arrangement position of the ink layer.

In the above, specific embodiments have been described with reference to the drawings to illustrate the technical idea of the present invention, but the present invention is not limited to the same configuration and effects as the specific embodiments as described above, and various modified examples are within the scope of the present invention. It can be carried out within the limit that does not deviate from Accordingly, such modifications should also be regarded as belonging to the scope of the present invention, and the true technical protection scope of the present invention should be determined by the technical spirit of the claims to be described later.

100: display device
110: cover glass
1111: black ink layer
1121: white ink layer
1131: shielding ink layer
10: optical adhesive

Claims (7)

a cover glass on which a bezel area is disposed along an outer edge of the active area;
a black ink layer printed with a width set in an outward direction using a printing line between the active area and the bezel area on the back surface of the cover glass as a starting point;
a first white layer printed outwardly spaced apart from the print line by a first set interval along the set width so as to partially overlap the black ink layer on the rear surface of the bezel area, and from the print line on the first white layer A second white layer printed outwardly spaced apart by a second set interval, and printed outwardly spaced apart from the printing line by a third set interval on the second white layer, from outside the printing end point of the black ink layer a white ink layer having a third white layer to be printed;
Shielding ink is printed outwardly spaced apart from the printing line by a fourth set interval, the fourth set interval is larger than the first set interval and smaller than the second set interval, and is printed with the same paint as the black ink layer floor; and
an additional ink layer disposed between the rear surface of the cover glass and the first white layer, printed outwardly spaced apart by a set offset interval from the printing end point of the black ink layer, and having a color different from that of the white ink layer but,
The height of the first white layer is the same as the height of the black ink layer, and the starting point of the third white layer is located within the offset interval between the printing ending point of the black ink layer and the printing starting point of the additional ink layer. .
delete a cover glass on which a bezel area is disposed along an outer edge of the active area;
a black ink layer printed with a width set in an outward direction using a printing line between the active area and the bezel area on the back surface of the cover glass as a starting point;
a first white layer printed outwardly spaced apart from the print line by a first set interval along the set width so as to partially overlap the black ink layer on the rear surface of the bezel area, and from the print line on the first white layer A second white layer printed outwardly spaced apart by a second set interval, and printed outwardly spaced apart from the printing line by a third set interval on the second white layer, from outside the printing end point of the black ink layer a white ink layer having a third white layer to be printed;
a shielding ink layer printed to partially cover the white ink layer; and
an additional ink layer disposed between the rear surface of the cover glass and the first white layer, printed outwardly spaced apart by a set offset interval from the printing end point of the black ink layer, and having a color different from that of the white ink layer but,
The third white layer is printed outwardly spaced apart from the printing end point of the black ink layer by 0.05 to 0.15 mm,
The starting point of the third white layer is located within the offset interval between the printing ending point of the black ink layer and the printing starting point of the additional ink layer. delete The method according to claim 1,
The additional ink layer,
A display device in which a color or a design pattern is printed from an outside of the printing starting point of the third white layer. delete 4. The method of claim 1 or 3,
In the white ink layer, the set interval of the first white layer to the third white layer from the print line is the smallest set interval, and increases in the order of the second set interval and the third set interval,
The offset interval has a smaller size than the first set interval.

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