KR101237357B1 - Contrast improvement type display device and method of manufacturing thereof - Google Patents

Abstract

Disclosed are a contrast improved display device and a method of manufacturing the same. The disclosed contrast-enhanced display device and manufacturing method thereof include: forming a black coating layer on the entire surface of a light emitting device and a printed circuit board, and removing a portion of the black coating layer formed on the diffusion part of the light emitting device by laser marking. The contrast ratio can be improved, manufacturing is easy, and the manufacturing cost can be reduced.

Description

CONTRAST IMPROVEMENT TYPE DISPLAY DEVICE AND METHOD OF MANUFACTURING THEREOF}

The present invention relates to a display device with improved contrast and a method of manufacturing the same. More specifically, a black coating layer is formed on the entire surface of the LED and the LED board, and a part of the black coating layer formed on the LED diffusion part is laser-marked. The present invention relates to a contrast-enhanced display device and a method for manufacturing the same, which remove the light and improve the contrast ratio of the display device.

In general, the display device is a display device that implements the image or video desired by the user because the LED is individually controlled by placing the LED on the substrate at a predetermined interval.

Such LED display devices may be used to make a large screen by combining several LED display devices vertically, vertically, and horizontally in a public place such as a performance hall, an exhibition hall, and an outdoor billboard.

In addition, when the LED display device is used outdoors or indoors, when the contrast ratio of the LED display device decreases due to ambient light, reflected light of the sun, or interference light, the clarity drops and the image quality deteriorates, making it impossible to see a clean screen. Has

This contrast ratio represents the ratio between the brightness at the darkest and the brightest. The higher the ratio of black and white, the better the product. The larger the contrast ratio, the more distinct the screen and the more accurate the color can be displayed.

As such, in order to improve the contrast ratio of the LED display device, in the case of the black LED package, there is a method of improving the contrast ratio by injecting black semitransparence silicon resin.

However, this method can slightly improve the contrast ratio, but there is a problem that can not significantly improve. In addition, although various attempts have been made to improve the contrast ratio of the LED display device, the situation is not achieved.

In addition, it is difficult to produce a clear image due to interference between LEDs in a small pitch display device with a narrow gap between LEDs, rather than a large pitch display device with a wide gap between LEDs. There is a problem that is significantly reduced.

In addition, in the case of individually coating the edge portion of the body of the surface-mount type LED, the coating process of the surface-mount type LED is difficult, there is a problem that the manufacturing cost increases.

Therefore, there is a need to improve this.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

The present invention has been made by the above-mentioned necessity, and forms a black coating layer on the entire surface of the light emitting device and the printed circuit board, and removes a part of the black coating layer formed on the diffusion part of the light emitting device by laser marking. An object of the present invention is to provide a contrast-enhanced display device and a method of manufacturing the same, which can improve contrast ratio, can be easily manufactured, and can reduce manufacturing cost.

A contrast improved display device according to the present invention includes: a light emitting module mounted on a frame, a plurality of light emitting devices arranged on a printed circuit board, and configured to emit light; It includes a contrast ratio improvement unit for improving the contrast ratio of the light to be fixed and a fixing unit for fixing the light emitting module to the frame, the contrast ratio improvement unit is black according to the light emitting angle of the light emitted from the black coating layer formed on the entire surface of the light emitting module and the light emitting device It characterized in that it comprises a light transmitting part is formed by removing part of the paint layer.

In addition, the light transmitting part is characterized in that formed by removing a part of the black coating layer by laser marking.

Further, the protective coating layer is formed on the front surface of the contrast ratio improvement part.

In addition, the fixing part is formed in the frame is exposed to the front side through the printed circuit board, the fixing projection to form a binding groove, the hook is formed on the edge to be bound to the binding groove of the fixing projection, and the opening so that a part of the light emitting element is exposed. It includes a fixed frame formed.

In addition, the fixed frame is characterized in that the shading film protrudes.

In addition, the front of the light emitting module is characterized in that the cap member for protecting and waterproofing the outside of the light emitting device is provided.

In addition, the cap member surrounds the light emitting device individually, and is connected by interconnects, and the cap member is formed to have an auxiliary black coating layer formed on the outside or inside to improve the contrast ratio, so that light irradiated from the light transmitting part is projected. The auxiliary black coating layer is partially removed, characterized in that the auxiliary transmission portion is formed.

In addition, a method of manufacturing a contrast-enhanced display device according to the present invention comprises the steps of: forming a black coating layer on the front surface of a light emitting module mounted with a light emitting element, and removing a part of the black coating layer by laser marking to form a light transmitting portion And fixing the light emitting module to the frame.

In addition, after forming the light transmitting portion, further comprising forming a protective coating layer for protecting the black coating layer.

The contrast-enhanced display device and its manufacturing method according to the present invention form a black coating layer on the entire surface of the light emitting module on which the light emitting device is mounted, and remove a portion of the black coating layer by laser marking, thereby improving contrast ratio of the display device. It is easy to manufacture, and has the effect of reducing the manufacturing cost.

Particularly, the present invention has the effect of preventing the sharpness from the interference between the LEDs even when the display device having a small pitch, and the background color is reduced when the camera is photographed.

1 is an exploded perspective view of a contrast improved display device according to an embodiment of the present invention;
2 is an enlarged view illustrating main parts of a contrast improved display device according to an embodiment of the present invention;
3 is a combined perspective view of a contrast improved display device according to an embodiment of the present invention;
4 is a view showing a contrast ratio improvement unit of a contrast improved display device according to an embodiment of the present invention;
5 is a sectional view taken along the line AA in Fig. 3,
6 is a sectional view taken along line BB of FIG.
7 and 8 are views showing a modified example of the cap member of the contrast improved display device according to an embodiment of the present invention,
9 is a view showing a manufacturing method of a contrast improved display device according to an embodiment of the present invention.

Hereinafter, an embodiment of a contrast improved display device and a method of manufacturing the same according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is an exploded perspective view of a contrast improved display device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main portion of a contrast improved display device according to an embodiment of the present invention, and FIG. 4 is a perspective view illustrating a contrast improving display device according to an embodiment, FIG. 4 is a view illustrating a contrast ratio improvement part of the contrast improved display device according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line AA of FIG. 3 is a cross-sectional view taken along line BB of FIG.

1 to 6, the contrast improved display device 100 according to the first embodiment of the present invention includes a frame 110, a light emitting module 120, a contrast ratio improving unit 130, and a fixing unit 140. It is made, including.

The frame 110 is formed in a plate shape and is coupled to the base frame 112 on which the printed circuit board 121 is seated, and to the rear side of the base frame 112, and to a signal and a power supply inside the printed circuit board 121. The cover frame 118 is provided with a control unit (not shown) for applying a.

A boss 114 is formed on the rear surface of the base frame 112, is screwed with the cover frame 118, and is spaced at a predetermined interval by the length of the boss 114 to have an installation space of the controller.

The support piece 116 supporting the side surface of the printed circuit board 121 is bent at the edge of the base frame 112.

A plurality of light emitting devices 125 are arranged on the front surface of the printed circuit board 121.

In addition, a connector (not shown) is formed on the rear surface of the printed circuit board 121 to extend the rear side through the base frame 112.

The light emitting device 125 according to the present invention shows a state in which the surface mounted LED is applied among the surface mounted LED, the substrate embedded LED, and the chip LED.

When the light emitting device 125 is a surface mount type LED, the light emitting device 125 is provided in the body 126 and the body 126 to be filled in the receiving part 127 and the receiving part 127 for accommodating the LED chip. The diffusion portion 128 is included.

The body 126 is formed in a hexahedral shape with one side open. The accommodating part 127 is formed to be inclined so that the light irradiation range of the light emitting device 125 gradually increases in the body.

The inner surface of the receiving portion 127 may be provided with a reflective surface to reflect the irradiated light.

The diffusion portion 128 is preferably a transparent resin containing a resin. Of course, it is possible to use other transparent resins in addition to the resin.

In addition, a contrast ratio improvement unit 130 for improving the contrast ratio of the light emitted from the light emitting element 125 is provided at the front side of the light emitting element 125.

The contrast ratio improvement unit 130 is formed by partially removing the black coating layer 132 formed on the entire surface of the light emitting module 120 and the black coating layer 132 according to the light emission angle of the light emitted from the light emitting device 125. It includes a light transmission unit 134.

The black coating layer 132 uses a coating material that is generally used to improve the contrast ratio.

The black coating layer 132 may be formed by spraying a coating material with a sprayer, or may be formed by dipping the surface of the printed circuit board 121 on which the light emitting device 125 is mounted in black coating material. It is possible to apply.

Then, a part of the black coating layer 132 stacked on the diffusion part 128 of the light emitting device 125 is laser-marked and removed by using a laser irradiated from the laser device, whereby the light transmitting part 134 Is formed.

The light transmission part 134 is formed in accordance with the light emission angle θ of the light emitted from the light emitting element 125. When the diffusion part 128 is viewed from the front, four corners cover a part of the edge in a rounded rectangle. It is formed by removing the central part in the state.

Of course, the light transmission unit 134 may be variously changed, such as square and circular, depending on the shape arrangement of the light emitting device 125.

As such, when the light emitting device 125 emits light and is irradiated forward by the control of the power supply and the control unit of the power not shown, the light is moved in accordance with the light emitting angle of the light emitting device 125 to diffuse the transparent part. It is irradiated to the outside through the light transmitting unit 134 through 128.

At this time, when the light emitted from the light emitting element 125 is irradiated through a portion other than the light transmitting portion 134, the contrast ratio is increased by increasing the ratio of black and white by absorbing or blocking in the black coating layer 132. .

In particular, since the entire surface of the light emitting module 120 except for the light transmitting part 134 is painted with the black coating layer 132, the light emitting devices 125 may be separated from each other in the display device having a small pitch in which a gap between the light emitting devices 125 is narrowly arranged. Because it eliminates the interference, it is difficult to produce a clear image and solve the problem of background color being cut off when taking a camera.

A protective coating layer 150 is formed on the front surface of the contrast ratio improvement unit 130. The protective coating layer 150 is preferably UV coating.

The black coating layer 132 may be protected from external scratches by the protective coating layer 150, and may be prevented from discoloring due to sunlight or lighting.

The fixing part 140 is to fix the light emitting module 120 to the frame 110, and is formed in the frame 110 to be exposed to the front side through the printed circuit board 121 to form the binding groove 143. The fixing protrusion 142 and the fixing groove 143 of the fixing groove 143, the hook 145 is formed on the edge, and the fixing frame 144 is formed to be an opening so that a portion of the light emitting device 125 is exposed. .

At this time, the through hole 122 is formed in the printed circuit board 121 so that the fixing protrusion 142 is exposed to the front side.

Then, the shading film 148 protrudes from the fixing frame 144. Shading film 148 is formed on the upper end of the opening portion of the fixing frame 144 to block the sunlight or lighting, thereby improving the contrast ratio.

Meanwhile, as illustrated in FIGS. 7 and 8, a cap member 160 may be provided on the front surface of the light emitting module 120 to protect and waterproof the outside of the light emitting device 125.

The cap member 160 individually surrounds the light emitting devices 125 and is connected by the interconnection portions 162.

In addition, the cap member 160 has an auxiliary black coating layer 164 formed on the outer side or the inner side of the cap member 160 to improve the contrast ratio, and the auxiliary black coating layer 164 is projected so that light emitted from the light transmitting unit 134 is projected. A part is removed to form the auxiliary penetrating portion 166.

It is preferable that the auxiliary transmission part 166 has the same shape as the light transmission part 134, but the total area of the auxiliary transmission part 166 is irradiated to be widened to both sides by the light emission angle, so that it is larger than the total area of the light transmission part 134. May be slightly larger.

The auxiliary transmission unit 166 has an effect of improving the contrast ratio even more than when only the light transmission unit 134 because the light is finely dispersed in the light from the light transmission unit 134 is absorbed or blocked over a second.

When the cap member 160 is applied, after the cap member 160 is covered with the light emitting device 125, the protective coating layer 150 is formed and fixed by the fixing part 140.

Hereinafter, a manufacturing method of a contrast improved display device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The light emitting module 120 having the light emitting device 125 mounted thereon is prepared.

In addition, a black coating layer 132 is formed on the entire surface of the light emitting module 120 in which the light emitting device 125 is mounted (S10). The black coating layer 132 may be formed by spraying a coating material with a sprayer, or may be formed by dipping the surface of the printed circuit board 121 on which the light emitting device 125 is mounted in black coating material. It is possible to apply.

Thereafter, a part of the black coating layer 132 is removed by laser marking to form the light transmitting part 134 (S20). The light transmitting unit 134 may be freely changed, such as an ellipse or a quadrangle, depending on the shape of the light emitting device 125.

After forming the light transmitting part 134, the protective coating layer 150 for protecting the black coating layer 132 is formed (S30). The protective coating layer 150 may be formed on the front surface of the light emitting module 120 to protect the black coating layer 132 from external scratches.

In addition, the protective coating layer 150 is made of UV coating, it can prevent deformation and discoloration by sunlight or lighting.

Thereafter, the light emitting module 120 is fixed to the frame 110 (S40). The fixing of the light emitting module 120 seats the printed circuit board 121 on which the light emitting device 125 is mounted on the front surface of the base frame 112. In addition, a support piece 116 supporting the side surface of the printed circuit board 121 may be formed at an edge of the base frame 112 so that the base frame 112 may be accurately seated on the base frame 112.

In addition, the fixing protrusion 142 protrudes from the front surface of the base frame 112 to be inserted into the through-hole 122 of the printed circuit board 121 to prevent shaking of the printed circuit board 121.

Thereafter, the cover frame 118 having the control unit is coupled to the rear surface of the base frame 112.

The boss 114 is protrudingly formed on the rear surface of the base frame 112 to be screwed to the cover frame 118 and spaced apart by the length of the boss 114 to secure an installation space of the controller.

The connector of the printed circuit board 121 is exposed to the rear surface of the base frame 112 and is electrically connected to the controller.

In the above state, the fixing frame 144 having an opening formed to partially expose the light emitting device 125 is bound to and fixed to the fixing protrusion 142 exposed to the front side of the light emitting module 120.

When the fixing frame 144 is coupled, it is fixed by the coupling of the hook 145 and the fixing protrusion 142 of the fixing frame 144. That is, as the end of the hook 145 is fastened to the binding groove 143 of the fixing protrusion 142 is possible.

In addition, the sunshade film 148 is formed at the upper end of the open portion of the fixing frame 144, respectively, and has an effect of improving the contrast ratio of the light emitted from the light emitting element 125 when the display apparatus 100 is used outdoors.

Meanwhile, a cap member 160 is provided between the light emitting device 125 and the fixing frame 144 to protect and waterproof the outside of the light emitting device 125.

At this time, the formation of the protective coating layer 150 and the coupling of the fixing frame 144 is performed after the cap member 160 is covered with each light emitting device (125).

According to the above configuration, the light emitting device 125 mounted on the printed circuit board 121 has the effect of maximizing the contrast ratio of the light generated from the light emitting device 125 by the contrast ratio improving unit 130.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

100: contrast improved display device 110: frame
112: base frame 114: boss
116: support piece 118: cover frame
120: light emitting module 121: printed circuit board
122 through hole 125 light emitting element
126: body 127: receiving portion
128: diffuser 130: contrast enhancement unit
132: black coating layer 134: light transmitting portion
140: fixing part 142: fixing protrusion
143: binding groove 144: fixing frame
145: Hook 148: Awning
150: protective coating layer 160: cap member
162: connecting portion 164: auxiliary black coating layer
166: auxiliary penetrating unit

Claims (9)

frame;
A light emitting module mounted on the frame and configured to emit light by having a plurality of light emitting elements arranged on a printed circuit board;
A contrast ratio improvement part provided at the front side of the light emitting device to improve the contrast ratio of light emitted from the light emitting device; And
A fixing part fixing the light emitting module to the frame;
The contrast ratio improvement part is a black coating layer formed on the entire surface of the light emitting module; And
And a light transmitting part formed by partially removing the black coating layer in accordance with the light emission angle of the light emitted from the light emitting device.
The method of claim 1,
And the light transmitting part is formed by removing a part of the black coating layer by laser marking.
The method of claim 1,
The contrast improving display device, characterized in that the protective coating layer is formed on the front surface of the contrast ratio improvement.
The method of claim 1,
The fixing part is formed in the frame is exposed to the front side through the printed circuit board, the fixing projections to form a binding groove;
And a fixing frame formed at an edge to be coupled to the binding groove of the fixing protrusion, and having an opening formed to expose a portion of the light emitting device.
5. The method of claim 4,
Contrast-improved display device, characterized in that the shading film protrudes on the fixing frame.
The method of claim 1,
The front surface of the light emitting module is a contrast improved display device, characterized in that the cap member for protecting and waterproofing the outside of the light emitting device is provided.
The method according to claim 6,
The cap member individually surrounds the light emitting element and is connected by interconnects;
The cap member is auxiliary or a black coating layer is formed on the outside or inside to assist in improving the contrast ratio, and the auxiliary black coating layer is partially removed so that the light irradiated from the light transmitting portion is characterized in that the auxiliary transmission portion is formed. Contrast-enhanced display device.
Forming a black coating layer on a front surface of the light emitting module in which the light emitting device is mounted;
Removing a portion of the black coating layer by laser marking to form a light transmitting portion; And
The method of manufacturing a contrast-enhanced display device comprising the step of fixing the light emitting module to the frame.
The method of claim 1,
And forming a protective coating layer for protecting the black coating layer after the light transmitting part is formed.

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