KR101337176B1 - Edge type lighting device for improving hot spot - Google Patents

Abstract

The present invention relates to a light metering type illumination device with improved hot spot, which is installed in a recessed space in which a pair of projecting terminals receiving power from the outside is provided, and a light source supplied with power from the projecting terminal is installed at the side portion, A light guide plate having a reflective pattern formed on a rear surface thereof so as to reflect light incident from the light source and radiate it over the entire surface; And a diffuser plate which diffuses the light transmitted from the light guide plate to the outside and is installed in an inclined state with respect to the light guide plate.
As a result, the occurrence of hot spots is prevented, and the bezel is not required to be installed, thereby providing cost reduction and improved light spots that can emit light on the front side.

Description

Edge type lighting device for improving hot spot}

The present invention relates to a metering type lighting device with improved hot spots, and more particularly, is installed in a recessed space formed with a pair of projecting terminals that receive power from the outside, and the light source to which power is supplied from the projecting terminal A light guide plate formed on the rear surface of the light guide plate so as to reflect the light incident from the light source and radiate it over the front surface; And a diffuser plate which diffuses the light transmitted from the light guide plate to the outside and is installed in an inclined state with respect to the light guide plate. Thus, occurrence of hot spots is prevented and luminance uniformity is improved, and a bezel is not required. The present invention relates to a light metering illumination device with improved hot spots capable of emitting light on its front surface.

The majority of display technologies currently in use are based on transmissive types. The transmissive display device refers to a display device that requires a backlight for illuminating an image to be displayed.

Typical types of transmissive displays include liquid crystal displays, billboards, lighting devices, and the like. Traditionally, transmissive displays used incandescent lamps or cold cathodic fluorescent lamps (CCFL). Recently, there is a trend to develop and use a light emitting diode (LED) that does not contain toxic mercury (Hg) and has excellent color reproduction and low power and high brightness.

Backlights used in such transmissive displays are classified into photometric and direct type according to the position of the light source.

The photometric type has a structure in which light of a light source disposed on one side of the display panel is refracted by the light guide plate and supplied to the display panel. On the other hand, the direct type has a structure in which a plurality of light sources are arranged on the back of the display panel to directly supply light to the display panel.

A flat panel LED lighting device using such a photometric backlight technology is used. The structure of a representative photometric flat panel LED lighting device is shown in FIG. 1.

Referring to FIG. 1, a bottom chassis 1 for maintaining a front shape of a display device is disposed, and a profile 3 having a predetermined thickness for maintaining a side shape of a display device along an edge of the bottom chassis 1. Is formed. A light source 5 is embedded and provided along a portion or the entire profile of the profile 3. In addition, a rear surface of the light source 5 may further include a PCB substrate 15 on which the light source 5 is mounted. At this time, the LED which is the light source 5 is mounted to be insulated or reheated, and is configured to be electrically connected to an external power source.

The reflective sheet 7, the light guide plate 9, and the diffusion plate 11 are stacked on the bottom chassis 1. Here, it is important to configure the light source 5 to coincide with the side surface of the light guide plate 9. Then, as indicated by the arrow in the drawing, the light emitted from the LED, which is the light source 5, spreads widely through the light guide plate 9, and the diffuser plate 11 placed on the front of the display device by the reflective sheet 7 disposed below. Will be emitted. In addition, the diffuser plate 11 evenly diffuses the light and emits the light to the front surface to have a uniform brightness when viewed from the front surface.

However, since the conventional lighting device using the LED is a point light source due to the characteristics of the light source 5 provided by the LED, it does not emit widely, but because a lot of light is concentrated in the place where the light source 5 provided by the LED is located. In this case, a hot spot, which is a region in which the portion in contact with the light guide plate 9 is higher in brightness than other surroundings, is generated.

This reduces the quality of the screen displayed through the lighting device, there is a problem of lowering the uniformity of the screen brightness distribution.

In order to overcome this, as shown in FIG. 1, the profile 3 covers the edge portion where hot spots occur, thereby reducing the emission area and increasing the cost by the bezel separately installed.

In addition, Figure 2 is a view showing a conventional lighting device using a bulb (bulb), conventionally protruded from the wall by a predetermined length and is mounted by mounting both ends of the bulb 22 to the protruding terminal 21 to which power is applied. Used as an apparatus.

On the other hand, in recent years, the bulb (bulb) type of lighting has been replaced by a lighting device using a low power consumption, long life and eco-friendly LED light source.

However, the commonly used protruding terminal 21 has a problem in that it is not possible to install a lighting device using the LED light source, and for this purpose, there is a problem in that a separate protruding terminal 21 is reinstalled.

Republic of Korea Patent Publication No. 2006-0130161 (December 18, 2006) "Reflector and backlight device"

Accordingly, an object of the present invention is to solve such a conventional problem, by mounting a light guide plate on a seating surface formed with an inclined surface of a predetermined angle and by installing a light source on one side of the light guide plate to prevent the occurrence of hot spots to improve luminance uniformity The hot spot is to provide an improved metering type illumination device.

In addition, an opening and a connection terminal may be installed between the protruding terminal for applying power to the light source and the substrate to install the conventional protruding terminal, thereby eliminating the need for a separate protruding terminal. It is to provide a type lighting device.

According to the present invention, the object is installed in a recessed space formed with a pair of protruding terminals receiving power from the outside, a light source supplied with power from the protruding terminal is installed on the side, and the light incident from the light source A light guide plate having a reflective pattern formed on a rear surface thereof to reflect and emit the light over the front surface; And a diffuser plate which diffuses the light transmitted from the light guide plate to the outside and is installed in an inclined state with respect to the light guide plate.

In addition, the front surface is opened to finish the interior by the diffusion plate, the inner surface facing the diffusion plate is formed to have an inclination with respect to the diffusion plate further includes a bottom chassis provided with a seating surface on which the light guide plate is seated. It is desirable to.

In addition, the bottom chassis inner surface is preferably provided with a plurality of mounting projections for fixing the light guide plate seated on the seating surface.

In addition, an opening formed in a central portion of the seating surface, a substrate interposed between the rear surface of the light guide plate and the seating surface and mounted with the light source, and a connection terminal connecting the protruding terminal and the substrate through the opening. It is preferable to further include.

In addition, the connection terminal is preferably formed in a different length depending on the separation distance between the protruding terminal and the substrate provided on the seating surface.

According to the present invention, a light guide plate is mounted on a seating surface on which an inclined surface is formed at a predetermined angle, and a light source is installed on one side of the light guide plate to prevent occurrence of hot spots, thereby providing a light metering illumination device having improved hot spots in which luminance uniformity is improved. .

In addition, since the occurrence of hot spots do not require a bezel on the edge of the light emitting surface, the front surface can emit light, thereby providing a light metering type illumination device with improved hot spots, which can reduce costs.

In addition, an opening and a connection terminal may be installed between the protruding terminal for applying power to the light source and the substrate to install the conventional protruding terminal, thereby eliminating the need for a separate protruding terminal. Type lighting apparatus is provided.

1 is a cross-sectional view showing a conventional metering type lighting device
2 is a cross-sectional view showing a lighting device using a conventional bulb.
3 is a conceptual diagram of a light metering lighting device having an improved hot spot of the present invention;
Figure 4 is a cross-sectional view of the light metering lighting device improved the hot spot of the present invention
5 to 10 is a view showing the luminance of the light emitting surface of the metering type illumination device with improved hot spot of the present invention
11 is a table showing the results according to FIGS. 5 to 10.
12 is a graph showing the results according to FIGS. 5 to 10.

Prior to description, components having the same configuration will be described with the same reference numerals.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the metering type illumination device is improved hot spot according to an embodiment of the present invention.

Illumination apparatus according to an embodiment of the present invention is installed in the protruding terminal by replacing the bulb shown in FIG. It can be used without limitation.

The metering type illumination device with improved hot spot according to the present invention includes a bottom chassis 110, a substrate 120 on which a light source is mounted, a light guide plate 130 reflecting incident light and dispersing it to the entire emission surface, and light. And a light source 140 generating a light source, a diffuser plate 150 for uniformly diffusing the light passing through the light guide plate 130, and a connection terminal 160 on which the light source 140 is mounted.

3 is a conceptual view of a light metering lighting device having an improved hot spot of the present invention, and FIG. 4 is a cross-sectional view of a light metering lighting device having an improved hot spot of the present invention.

Referring to FIG. 4, the bottom chassis 110 is provided in a shape in which one surface of a rectangular parallelepiped is opened, and is installed in a recessed space of a wall to be installed, and a seating surface 111 on which a light guide plate 130 to be described later is mounted. The mounting protrusion 113 fixing the opening 112 formed on the seating surface 111 and the light guide plate 130 seated thereon and a fastening groove 114 for fixing the bottom chassis 110 are included.

On the other hand, the shape of the bottom chassis 110 is not limited by the above description can be manufactured in various forms.

The mounting surface 111 is formed to have an inclination on the inner surface of the bottom chassis 110 opposite to the opened surface of the bottom chassis 110 to provide an inclined surface to the light guide plate 130 to be described later. At this time, it is preferable that the inclined surface has an inclination of 3 to 15 degrees.

The opening 112 is formed by opening the central portion of the seating surface 111, and the connection terminal 160 to be described later penetrates.

A plurality of mounting protrusions 113 are installed along the inner surface of the bottom chassis 110 to fix the light guide plate 130 and the substrate 120 to be described later mounted on the seating surface 111.

The fastening groove 114 is formed on the outer surfaces of both end portions of the bottom chassis 110 to be coupled to the fastening protrusion 151 of the diffusion plate 150 to be described later to fix the bottom chassis 110, and the fastening groove 114 and A fastening groove 114 is also formed in the corresponding wall to be fixed in combination with the fastening protrusion 151 described later.

Referring to FIG. 4, the substrate 120 is a member that is mounted in an inclined state on the seating surface 111 and supplies electricity to a light source 140 to be described later.

The light guide plate 130 is a member that propagates the light incident to the side to cause total internal reflection and propagates the light incident at an angle of incidence smaller than the critical angle so that the light is transmitted to the upper side and the lower side without being totally reflected. Stacked in an inclined state, it is fixed and installed in the inclined state of the bottom chassis 110 by the mounting protrusion 113 formed in the bottom chassis 110.

The light guide plate 130 is stacked and installed on the substrate 120 as described above, and light is incident from one of the light sources 140 to be described later on one side of the both ends, which is far from the diffusion plate 150, which will be described later. And a light incident surface 131, a reflection pattern 132 reflecting incident light, and an emission surface 142 from which the reflected light is emitted to the outside by the reflection pattern 132.

The reflection pattern 132 is a member that reflects the light of the light source incident on the light incident surface 131 and reflects the light to the emission surface 133, and a pattern for guiding light to the emission surface 133 is formed.

In this case, since the light guide plate 130 is fixed in an inclined state, the distance between the light guide plate 130 and the diffusion plate 150 to be described later varies depending on the position. Therefore, in consideration of this, the reflective pattern 132 may be formed to uniformly supply the reflected light to the emission surface 133 of the light guide plate 130 to be described later.

The reflective patterns 132 illustrated in FIGS. 3 and 4 are shown in a zigzag shape for clarity of components, and do not represent the shapes of the patterns.

The light source 140 is provided with an LED, and the point light source by the LED is changed into a surface light source by the light guide plate 130 described above, and fixed in the bottom chassis 110 by the mounting protrusion 113 in an inclined state. Among the side ends of the substrate 120 and the light guide plate 130, the substrate 120 and the light guide plate 130 are disposed on a lower surface of the substrate 120 and a light incident surface 141 of the light guide plate 130 which are far from each other.

As described above, since the light source 140 is installed to be spaced apart from the diffusion plate 150 to be described later by a predetermined distance, the hot spot is prevented from occurring in the diffusion plate 150 by the light source 140 to be described later.

The diffusion plate 150 is a member that uniformly diffuses the light passing through the light guide plate 130 in the present invention, and finishes each member installed in the interior by closing the opened surface of the bottom chassis 110 from the outside. At the same time serves as a cover.

The diffusion plate 150 is formed in a flat plate shape, and fastening protrusions 161 for fixing the bottom chassis 110 in the recess space at both ends are formed to protrude in both directions, so that the fastening groove 114 and the wall of the bottom chassis 110 are formed. The bottom chassis 110 and the diffusion plate 150 are fixed by being coupled to the fastening groove 114 formed in the groove.

On the other hand, the fastening method by the fastening groove 114 and the fastening protrusion 151 is not limited by the above-mentioned, it may be implemented in various forms.

In addition, the diffusion plate 150 is not limited to a specific optical performance because the optical properties are very variable depending on the type of product used, the diffusion plate 150 may be used of various characteristics.

The connecting terminal 160 is a member for connecting the photometric lighting device to the protruding terminal 22 for supplying power to the conventional lighting device, and the step distance between the protruding terminal 22 formed by the inclined surface and the substrate 120. In consideration of this, the two lengths are formed to be different from each other, and are installed on the rear surface of the substrate 120 through the opening 112 formed in the bottom chassis 110.

Therefore, the connecting terminal 160 connects the metering type lighting device with improved hot spot according to the present invention without the need for newly installing the protruding terminal 22 and the whole device to connect the metering type lighting device to the conventional lighting device. Can be.

The operation of one embodiment of the above-described metering type illumination device with improved hot spot will now be described.

3 and 4, after connecting two connection terminals 160 having different lengths to the protruding terminal 22 to install the lighting device, and applying power, the connecting terminal connected to the protruding terminal 22 ( Power is supplied to the substrate 120 through the 160, and light is generated from the light source 140 mounted on the substrate 120.

In this case, since the substrate 120 and the light guide plate 130 are inclined to the seating surface 111, and the light source 140 is installed at a side end spaced apart from the diffuser plate 150, the light guide plate 130 is separated from the reflection pattern 132. The occurrence of hot spots is prevented from occurring.

In addition, the overall brightness uniformity is improved because hot spots do not occur, and a bezel is not installed to cover the hot spots. Therefore, a reduction in the light emitting area caused by the bezel prevents the light emission from the front surface, and a separate bezel There is an advantage that can reduce the cost of installation.

The generated light is incident on the light incident surface 131 of the light guide plate 130 and reflected by the reflection pattern 132 provided on the rear surface of the light guide plate 130 to the exit surface 133 of the light guide plate 130. Diffused while passing through the exit surface 133 is supplied to the diffusion plate 150.

In this case, the light guide plate 130 installed horizontally and the light guide plate 130 installed in an inclined state with respect to the diffuser plate 150 may vary at a separation distance depending on a position, but may be formed by a pattern formed in the reflector 130. The reflected light is uniformly transmitted to the entire emission surface 133 of the light guide plate 130.

The transmitted light is incident on the rear surface of the diffuser plate 150 which finishes the bottom chassis 110, and the incident light is uniformly diffused through the diffuser plate 150 to emit light to the front surface to supply light.

On the other hand, Figures 5 to 10 is a view showing the measurement of the luminance of the light emitting surface of the above-described photometric type illumination improved hot spot, Figure 11 is a table showing the results according to Figures 5 to 10, Figure 11 A graph showing the results according to 5 to 10.

5 to 10 are diagrams showing the results measured using a 3t Diffuser-Haze 95% diffuser plate 150 and the facing luminance meter CA-2000. On the other hand, the above-described diffuser plate 150 sample and the facing luminance meter is only one example for obtaining a result according to the present invention, the diffusion plate 150 is a very variable optical properties according to the product, so as described above It is not limited.

5 to 7, luminances of the light guide plate 130 and the diffusion plate 150 when the distance l is 2 mm and the inclinations θ are 0 °, 3.5 °, and 7.5 °, respectively. As a strong hot spot area A and a bright line C appear clearly.

FIG. 8 is a diagram illustrating luminance when the separation distance l is 2 mm and the inclination θ is 10 °. As shown, the hot spot region A does not occur but the bright line C is visible. Able to know.

9 to 10 illustrate luminance when the separation distance l is 2 mm and the inclination θ is 13.5 ° and 15 °. In FIG. 9 and FIG. 10, no hot spot area A is generated. And, it can be seen that the bright line A disappears completely when the tilt θ is 15 °.

11 to 12, as the separation distance l of the light guide plate 130 and the diffusion plate 150 is the same and the inclination θ increases, the hot spot area A and the comparison area B The ratio of to approaches 1, and thus it can be seen that the occurrence of hot spots and bright lines disappears.

On the other hand, when the inclination θ is low, hot spots and bright lines are generated, and when the inclination θ becomes higher than necessary, it is difficult to manufacture the product, and thus the diffusion plate 150 is not provided. It is preferable to apply an appropriate inclination θ and a separation distance l according to the type of.

As described above, the light source 140 is spaced apart from the diffuser plate 150 by the seating surface 111 having a predetermined inclination to prevent the occurrence of hot spots, thereby improving the overall brightness uniformity, and the bezel is not required to be installed. The front surface can emit light and the cost is reduced.

In addition, by connecting the lighting device using the connection terminal 160 to the conventional protruding terminal 22, it is not necessary to install a separate protruding terminal 22 in order to install the light metering lighting device has the effect of reducing the cost have.

The scope of the present invention is not limited to the above-described embodiments but may be implemented in various forms of embodiments within the scope of the appended patents. Without departing from the gist of the invention as claimed in the patent scope, those skilled in the art to which the invention pertains are considered to be within the scope of the claims described in the present invention to various extents that can be modified.

110: bottom chassis 120: substrate 130: light guide plate
140: light source 150: diffuser 160: connection terminal

Claims (5)

In the metering type lighting device which is buried in a portion where a pair of projecting terminals are provided on the base surface of the recessed space of the wall,
A bottom chassis provided in a recessed shape in which a front surface is opened, and a seating surface having an inner base surface is an inclined surface, and an opening formed in the seating surface, the bottom chassis being embedded in the recessed space;
A light guide plate seated on the seating surface and having a reflective pattern disposed on a rear surface of the light reflecting the light incident from the light source and emitting the light across the front surface;
A substrate mounted on the inner side of the bottom chassis and interposed between the light guide plate and the seating surface to transfer power supplied from the protruding terminal to the light source;
A diffusion plate installed to cover the opened front surface of the bottom chassis to close the inside, and installed to have an inclination with the light guide plate to diffuse light transmitted from the light guide plate to the outside; And
And a connection terminal connecting the protruding terminal to the substrate by passing through an opening formed in the seating surface of the bottom chassis.
And the seating surface is formed such that a distance between the light guide plate and the diffuser plate is gradually closer to the light source in a direction away from the light source. delete The method of claim 1,
The bottom side inner side surface of the metering type lighting device is improved hot spots, characterized in that a plurality of mounting projections for fixing the light guide plate seated on the seating surface is installed. delete The method of claim 1,
The connecting terminal is a light spot improved light spot, characterized in that the length is formed differently according to the separation distance between the projecting terminal and the substrate installed on the seating surface.

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