KR102438261B1 - Display Device - Google Patents

Abstract

The present invention can reduce the overall height of the ink layer by providing a guide groove on the back surface of the cover glass and printing a black ink layer on the guide groove, thereby preventing the generation of bubbles while the optical pressure-sensitive adhesive is attached to the lowered ink layer. The present invention provides a display device capable of printing a black ink layer more precisely compared to printing only a black ink layer since the black ink layer is printed after the guide groove is precisely processed on the back surface of the cover glass.

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, the problem of assembly defects or thickening of the display device is pointed out due to the increase in the height of the ink layer. .

The present invention is to solve such a problem, and more specifically, some ink layers among the ink layers printed in a plurality of layers on the back surface of the cover glass are provided with guide grooves on the back surface of the cover glass, and the ink layers are printed in the guide grooves. Accordingly, an object of the present invention is to provide a display device capable of reducing thickness and improving assembly defects.

Another object of the present invention is to provide a display device in which a bezel area and an active area can be accurately distinguished on a cover glass through a black ink layer printed on a guide groove.

In order to solve the above problems, the present invention provides a guide groove on the back surface of the cover glass, and by printing a black ink layer on the guide groove, it is possible to reduce the overall height of the ink layer, thereby reducing the height of the optical pressure-sensitive adhesive. Provided is a display device capable of reducing bubble generation while being attached to an ink layer.

In addition, the present invention can provide a display device capable of printing the black ink layer more precisely compared to printing only the black ink layer because the black ink layer is printed after the guide groove is first precisely processed on the back surface of the cover glass.

According to the display device of the present invention

First, by providing a guide groove on the back surface of the cover glass and printing the black ink layer inside the guide groove, the height of the entire ink layer can be reduced as much as the height of the black ink layer,

Second, it is possible to reduce the bubble defect by reducing the height of the ink layer, and also to reduce the height (thickness) of the display device,

Third, since the black ink layer is printed along the guide groove, it is possible to print more precise and straight lines,

Fourth, there is an effect that can save the cost and time due to the reattachment of the optical adhesive layer due to the bubble defect.

1 is an exploded perspective view showing a display device according to an exemplary embodiment of the present invention.
FIG. 2 is a rear view showing the back surface of a cover glass of the display device shown in FIG. 1 .
FIG. 3 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 .

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.

1 is an exploded perspective view showing a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , 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 .

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. 2 is a rear view showing the back surface of the cover glass of the display device shown in FIG. 1 , and FIG. 3 is a reference diagram sequentially showing the order in which ink layers are printed on the back surface of the cover glass of the display device shown in FIG. 2 .

2 and 3 , 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 separating the bezel area B/A, a white ink layer 1121 printed on the black ink layer 1111, and a shielding ink layer printed on the white ink layer 1121 1131 and an optical pressure-sensitive adhesive 10 attached to partially overlap the shielding ink layer 1131 together with the back surface of the cover glass 110 .

3A is a cross-sectional view illustrating a state in which a guide groove is processed on a cover glass, and FIG. 3B is a cross-sectional view illustrating a black ink layer printed inside the guide groove.

As shown in FIG. 3A , first, guide grooves 111 are formed with a set height (or thickness) and width along the periphery of the active area A/A on the rear surface of the cover glass 110 . The guide groove 111 is provided by separately processing the rear surface of the cover glass 110 , and is processed to have a height at least lower than the rear surface of the cover glass 110 .

The black ink layer 1111 is printed inside the guide groove 111 . Since the black ink layer 1111 is printed inside the guide groove 111 in a state in which the guide groove 111 is processed, more precise straightness can be realized compared to printing only the black ink layer 1111 . 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. Accordingly, as the printing of the black ink layer 1111 becomes more sophisticated, the quality can be improved.

The height of the guide groove 111 is processed in the range of about 4 to 10 μm. The height of the guide groove 111 is formed to correspond to the height at which the black ink layer 1111 is to be secured. More preferably, the black ink layer 1111 is printed to have a height of 6 to 8 μm. In addition, the width of the guide groove 111 is processed in the range of about 0.2 ~ 0.6mm. Only when the height and width of the black ink layer 1111 are secured in this way, the active area A/A and the bezel area B/A can be clearly distinguished and light leakage can be prevented.

In addition, since the height of the black ink layer 1111 is reduced on the back surface of the cover glass 110 by the height of the guide groove 111 , the height of all printed ink layers can be reduced. In addition, since the height of all the printed ink layers on the back surface of the cover glass 110 is reduced, it is possible to reduce the occurrence of bubbles generated while the optical pressure-sensitive adhesive 10 is attached, thereby reducing the bubble defect rate. have.

3C is a cross-sectional view illustrating a white ink layer printed on a cover glass.

Referring to FIG. 3C , the white ink layer 1121 is formed on the first white layer 1122 printed to partially overlap the black ink layer 1111 on the back surface of the cover glass 110 and on the first white layer 1122 . and a second white layer 1123 to be printed.

The first white layer 1122 is overlapped outwardly along a set width from about the center 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 the first white layer 1122 may be printed in different colors to correspond to devices of various colors.

The height of the first white layer 1122 is in the same range as the height 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 such that the first white layer 1122 and the second white layer 1123 are layered on each other. 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 about 1/4 of the black ink layer 1111 . Here, the portion where the second white layer 1123 overlaps the black ink layer 1111 is described as an example, and it goes without saying that printing may be performed so that it overlaps less or does not overlap at all.

3D is a cross-sectional view illustrating that the third white layer and the fourth white layer of the white ink layer are printed.

Referring to FIG. 3D , the white ink layer 1121 includes a third white layer 1124 printed on the second white layer 1123 and a fourth white layer 1125 printed on the third white layer 1124 . ) is included.

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 . In addition, the fourth white layer 1125 is printed in a more outward direction than the third white layer 1124 . Accordingly, a step-shaped layer is formed from the first white layer 1122 to the fourth white layer 1125 , respectively. As the white ink layer 1121 is printed in such a step shape, it is possible to reduce the generation of bubbles in the portion in contact with the portion to which the optical pressure-sensitive adhesive 10 is attached, thereby reducing processing defects.

The third white layer 1124 and the fourth white layer 1125 may be selectively printed on the white ink layer 1121 according to the degree of color expression, and when the color expression is insufficient, additionally a fifth white layer (not shown) ) or more ink layers may be further provided.

FIG. 3E is a cross-sectional view showing that a shielding ink layer is printed on a white ink layer, and an optical adhesive is attached on the shielding ink layer and the cover glass.

Referring to FIG. 3E , a shielding ink layer 1131 is printed on the white ink layer 1121 . 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 . .

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 may be additionally performed after attachment is completed. When the defoaming process is further progressed, the bubbles existing between the ink layer and the optical pressure-sensitive adhesive 10 escape, thereby remarkably reducing the bubble defect.

Therefore, according to the display device of the present invention, by providing a guide groove on the back surface of the cover glass and printing the black ink layer inside the guide groove, the height of the entire ink layer can be reduced as much as the height of the black ink layer, and the height of the ink layer can be decreased. By reducing the bubble defect, it is possible to reduce the height (thickness) of the display device, and since the black ink layer is printed along the guide groove, a more precise and straight line can be printed, and the bubble defect Therefore, there is an effect of saving the cost and time accompanying the reattachment of the optical adhesive 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
111: guide home
1111: black ink layer
1121: white ink layer
1131: shielding ink layer
10: optical adhesive

Claims (10)

a cover glass provided with a guide groove having a set width along the periphery of the active area on the rear surface of the bezel area;
a black ink layer filled in the guide groove;
a white ink layer printed outwardly of the cover glass along the set width so as to overlap the black ink layer at least once on a rear surface of the bezel area;
a shielding ink layer printed to cover the white ink layer;
including,
The black ink layer is printed at the same height as the rear surface of the cover glass. The method according to claim 1,
The guide groove is a display device made of a height range of 4 to 10㎛. The method according to claim 1,
The guide groove is a display device made in the range of 0.2 ~ 0.6mm width. The method according to claim 1,
The white ink layer,
a first white layer printed to partially overlap the black ink layer on the rear surface of the bezel area;
and a second white layer printed on the first white layer so as to be layered in an outer direction. 5. The method according to claim 4,
The second white layer is printed with a smaller area overlapping the black ink layer than the first white layer. 5. The method according to claim 4,
The white ink layer,
and a third white layer printed on the second white layer so as to be layered in an outer direction. 7. The method of claim 6,
The third white layer is printed so as not to overlap with at least the black ink layer. 7. The method of claim 6,
The shielding ink layer is printed in a step shape along the spaced-apart layers of the first white layer to the third white layer. delete The method according to claim 1,
On the back side of the cover glass,
and an optical adhesive attached to cover the black ink layer and the shielding ink layer.

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