KR101247207B1 - Lamp housing for liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, in particular a lamp housing of the backlight unit

The present invention relates to improving the illumination, and further comprises a plurality of reflective mirrors configured in the shape of concave lenses in the lamp housing.

The light emitted from the outside of the fluorescent lamp and reflected by the reflective layer of the lamp housing is incident to the inside of the light guide plate, so that some light is scattered by the outside of the fluorescent lamp. It is totally reflected by the mirror and is incident into the light guide plate.

Due to this, it is possible to minimize the loss of light, and also has the effect of injecting a greater amount of light into the light guide plate.

Lamp housing, concave lens, reflective mirror, light guide plate, liquid crystal display module

Description

Lamp housing for liquid crystal display device

1 is a cross-sectional view of a general liquid crystal display module.

FIG. 2 is a view schematically illustrating a path of light emitted from the fluorescent lamp of FIG. 1 and incident into a light guide plate; FIG.

Figure 3 is a spectrum analysis of the brightness of the light emitted from the fluorescent lamp incident into the light guide plate.

4 is a cross-sectional view of a liquid crystal display module according to an embodiment of the present invention.

FIG. 5 is a view schematically illustrating a path of light emitted from the fluorescent lamp of FIG. 4 and incident into the light guide plate; FIG.

Figure 6 is a photograph of the spectrum analysis of the luminance of light emitted from the fluorescent lamp according to the embodiment of the present invention incident on the light guide plate.

<Description of the symbols for the main parts of the drawings>

110: liquid crystal panel 112, 114: first and second substrate

122: light guide plate 126: fluorescent lamp

134: multiple optical sheet 140: lamp housing

142: reflector plate 144: reflective layer

146: reflection mirror 152: support main

154: cover cover 156: top cover

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to improvement of a lamp housing structure of a backlight unit.

The image realization principle of a general liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. The liquid crystal has a thin and long molecular structure and an anisotropy having an orientation in the array, and when placed in an electric field, the polarization in which the direction of the molecular array changes according to its size is changed. It has a nature.

The liquid crystal display is an essential component of a liquid crystal panel composed of a pair of transparent insulating substrates, each having a liquid crystal layer interposed therebetween, and having a field generating electrode formed therebetween. Various images are displayed by artificially adjusting the arrangement direction of the molecules and using the light transmittance which is changed at this time.

Since the liquid crystal panel does not have a light emitting element, it requires a separate light source. As a result, a backlight unit having a fluorescent lamp is provided on the rear surface to irradiate light toward the front of the liquid crystal panel, thereby realizing an image of identifiable luminance.

Meanwhile, a backlight unit for a general liquid crystal display device may be largely divided into a light metering method and a direct light method, and the light metering method may include a separate light guide plate on a rear surface of the liquid crystal panel, and then arrange a fluorescent lamp on one side thereof to form a surface by the light guide plate. Implement a light source. In addition, the direct method supplies light by arranging a plurality of fluorescent lamps on the back of the liquid crystal panel.

1 is a cross-sectional view of a general liquid crystal display module.

As shown in the drawing, the liquid crystal panel 10 includes first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween.

Next, the backlight unit includes a light guide plate 22 interposed between the rear side of the liquid crystal panel 10, a fluorescent lamp 26 arranged on one side thereof, and a plurality of optical sheets 34 provided between the light guide plate 22 and the liquid crystal panel 10. ) And a reflecting plate 42 on the rear surface of the light guide plate 22.

In addition, one side of the reflector plate 42 is configured with a lamp housing 40 for guiding the fluorescent lamp 26, the lamp housing 40 has a structure in which one surface is opened to mount the fluorescent lamp 26 therein The upper, lower and outer sides of the fluorescent lamp 26 are guided.

A reflective layer 44 is formed on one surface of the lamp housing 40 to guide the outside of the fluorescent lamp 26.

In order to fasten the liquid crystal panel 10 and the backlight unit, the edges of the support main body 52 are surrounded by a rectangular frame shape, and the support main body 52 is opened to prevent the deformation of the support main body 52. The cover bottom 54 is coupled along the back of one edge, and the top cover 56 bordering the edge of the liquid crystal panel 10 is assembled to the support main 52 and the cover bottom 54 so as to fix both of them. Is fastened.

FIG. 2 is a view schematically illustrating a path of light emitted from the fluorescent lamp of FIG. 1 and incident into the light guide plate.

As shown, the lamp housing 40 comprises a first surface, a second surface parallel to the first surface, and a third surface perpendicular to the first and second surfaces.

In addition, the third surface of the lamp housing 40 is provided with a reflective layer 44 for re-incident light emitted from the outside of the fluorescent lamp 26 toward the light guide plate 22.

The light of the fluorescent lamp 26 is emitted through an open surface of the lamp housing 40, and the emitted light is introduced into the light guide plate 22 through the light incident part of the light guide plate 22 positioned above the reflector plate 42. You will join.

At this time, the light emitted to the outside of the fluorescent lamp 26 is reflected by the reflective layer 44 formed in the lamp housing 40 is re-entered into the light incident part of the light guide plate 22, in which part of the reflected light is re-incident In this case, a case of hitting the outside of the fluorescent lamp 26 occurs.

This will be described in detail with reference to the photograph of FIG. 3. In the region A on the lower side of the photograph, a fluorescent lamp (26 of FIG. 2) is positioned, and a light guide plate (22 of FIG. 2) is located in a region B of the fluorescent lamp 26. ) Is a configuration in which the light emitted from the fluorescent lamp 26 is a spectrum analysis picture of the brightness of the light incident into the light guide plate 22 through the light incident part of the light guide plate 22.

The light incident part of the light guide plate 22 in which light is emitted from the fluorescent lamp 26 is incident to yellow and red spectrums having a high luminance of 2200 to 4400 nt. As you move away from the miner, you can see a black spectrum showing a low luminance of 1100 nt or less.

At this time, what is important is a graph showing the amount of light according to the luminance of the spectrum analysis picture.

As shown, it can be seen that the amount of light also has the maximum luminous intensity at the light incidence portion of the light guide plate 22 having the highest luminance with yellow and red spectrum, and black spectrum. It can be seen that the amount of light is also measured in the low luminance region.

However, it can be seen that the peak showing the maximum luminous intensity is distorted, whereby the light reflected by the reflective layer (44 in FIG. 2) of the lamp housing (40 in FIG. 2) hits the outside of the fluorescent lamp 26. This is because diffuse reflection is scattered and scattered in various directions.

Therefore, light loss occurs in the lamp housing (40 in FIG. 2), and thus, light incident on the light guide plate 22 is also lost.

강도를 가진 두 파장 사이의 간격으로, 반치폭이 두꺼울수록 사람의 색감각과의 차이가 많이 나게 된다.In addition, it can be seen that the spectrum half bandwidth of the spectrum is thick, which is the maximum emission intensity of the amount of light

The greater the half width, the greater the difference between a person's sense of color and the distance between two wavelengths of intensity.

The present invention is to solve the above problems, and aims to minimize the loss of light by preventing the diffused light from the outside of the fluorescent lamp is diffusely reflected, and also to inject a lot of light into the light guide plate. .

In order to achieve the object as described above, the present invention is covered covertum; A support main formed on the cover bottom and having a rectangular shape; A fluorescent lamp arranged along the longitudinal direction of one edge of the support main; A lamp housing guiding the fluorescent lamp and including a plurality of reflection mirrors therein; A reflection plate formed on the cover bottom and configured on one side of the fluorescent lamp; A backlight unit including a light guide plate mounted on the reflection plate; A liquid crystal panel mounted on the backlight unit; It provides an LCD module including a top cover bordering the edge of the liquid crystal panel and assembled to the support main and cover bottom.

The backlight unit may further include a plurality of optical sheets interposed on the light guide plate, wherein the lamp housing has a first surface, a third surface parallel to the first surface, and the first and second surfaces. And a third surface perpendicular to the surface, wherein the third surface is further configured with a reflective layer.

In addition, the reflective mirror has a concave lens shape, a plurality of reflective mirrors are formed in the upper and lower regions that do not correspond to the fluorescent lamp of the reflective layer, the reflective mirror is along the longitudinal direction of the lamp housing It is characterized in that the configuration. In addition, the reflective mirror is characterized by using a metal having a reflectivity of 95% or more including silver (Ag) and aluminum (Al).

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

4 is a cross-sectional view of a liquid crystal display module according to an embodiment of the present invention.

As illustrated, the liquid crystal panel 110 includes first and second substrates 112 and 114 bonded to each other with a liquid crystal layer interposed therebetween.

Next, the backlight unit includes a light guide plate 122 interposed between the rear side of the liquid crystal panel 110, a fluorescent lamp 126 arranged on one side thereof, and a plurality of optical sheets 134 provided between the light guide plate 122 and the liquid crystal panel 110. ) And a reflecting plate 142 on the rear surface of the light guide plate 122.

In addition, one side of the reflector plate 142 constitutes a lamp housing 140 for guiding the fluorescent lamp 126. The lamp housing 140 has a structure in which one surface is opened to mount the fluorescent lamp 126 therein. The upper, lower and outer sides of the fluorescent lamp 126 are guided.

A reflective layer 144 is formed on one surface of the lamp housing 140 to guide the outside of the fluorescent lamp 126, and a plurality of reflective mirrors 146 formed in a concave lens shape on the upper side and the lower side of the reflective layer 144. Configure

In order to fasten the liquid crystal panel 110 and the backlight unit, the edges of the support main frame 152 border the edges thereof, and the support main frame 152 is opened to prevent the deformation of the support main frame 152. The cover cover 154 is coupled to the back surface of one edge, and the top cover 156 that rims the edge of the liquid crystal panel 110 is assembled to the support main 152 and the cover bottom 154 so as to fix both of them. Tighten.

At this time, although not shown, the fluorescent lamp 126 is composed of a glass tube, inert gases inside the glass tube, and first and second electrodes provided at both ends of the glass tube, and phosphors are coated on the inner wall of the glass tube.

In the fluorescent lamp 126, when an AC voltage is applied to the first and second electrodes from an inverter (not shown), the electrons are applied to one electrode of the two electrodes in the process of moving to the other electrode. It collides with the inert gas formed inside the glass tube. In this process, secondary electrons are released, and the inert gas is excited.

As a result, ultraviolet rays are generated in the process of reducing the excited inert gas molecules to a stable state, and the ultraviolet rays are absorbed by the fluorescent material to emit visible light.

In addition, the cover bottom 154 disposed at the lowermost end of the liquid crystal display module is made of an aluminum material, and prevents light leakage of visible light emitted from the fluorescent lamp 126 and at the side and rear of the fluorescent lamp 126. By reflecting the visible light proceeding to the plurality of optical sheet 134 side to improve the efficiency of the light emitted from the fluorescent lamp 126.

The plurality of optical sheets 134 serve to propagate light emitted from the fluorescent lamp 126 toward the liquid crystal panel 110 and allow incident light at a wide range of angles, thereby improving light efficiency. Play a role.

In addition, the lamp housing 140 for guiding the fluorescent lamp 126 so that the light emitted from the fluorescent lamp 126 is concentrated on one side of the light guide plate 122, the reflective layer formed on one surface of the lamp housing 140 ( 144 reflects the light emitted from the outside of the fluorescent lamp 126 and serves to reenter the light guide plate 122.

The plurality of reflective mirrors 146 having concave lens shapes on the upper side and the lower side of the reflective layer 144 totally reflect the light diffused in the interior of the lamp housing 140 to be re-entered into the light guide plate 122.

FIG. 5 is a view schematically illustrating a path of light emitted from the fluorescent lamp of FIG. 4 and incident into the light guide plate.

As illustrated, the lamp housing 140 includes a first surface, a second surface parallel to the first surface, and a third surface perpendicular to the first and second surfaces.

In addition, the third surface of the lamp housing 140 constitutes a reflective layer 144 for re-injecting the light emitted from the outside of the fluorescent lamp 126 to the light guide plate 122 side, the fluorescence of the reflective layer 144 On the upper side and the lower side that do not correspond to the lamp 126, a plurality of reflective mirrors 146 having a concave lens shape are formed.

The light of the fluorescent lamp 126 is emitted through the opened surface of the lamp housing 140, and the emitted light is introduced into the light guide plate 122 through the light incident part of the light guide plate 122 positioned on the reflective plate 142. Enter.

At this time, the light emitted to the outside of the fluorescent lamp 126 is reflected by the reflective layer 144 configured in the lamp housing 140 is re-entered into the light incident part of the light guide plate 122, at this time, hit the outside of the fluorescent lamp 126 Some of the diffusely reflected light is totally reflected by the plurality of reflection mirrors 146 to be re-incident into the light guide plate 122.

The reflective mirror 146 is formed along the longitudinal direction of the lamp housing 140 and has the best efficiency by using metals such as silver (Ag) and aluminum (Al) having a reflectance of 95% or more.

In this case, the plurality of reflection mirrors 146 is configured to allow more light to enter the light guide plate 122 by making the path of light easier, and when formed as one reflection mirror 146, the fluorescent lamp An angle incident on 126 occurs to cause diffuse reflection.

FIG. 6 is a spectral analysis photograph according to an exemplary embodiment of the present invention, in which a fluorescent lamp (126 of FIG. 4) is positioned in an area A of the lower side of the photograph, and a light guide plate (FIG. 4) is located in a region B of one side of the fluorescent lamp 126. 122) is a configuration in which the light emitted from the fluorescent lamp 126 is a photograph of the brightness of light incident into the light guide plate 122 through the light incident part of the light guide plate 122.

The light incidence portion of the light guide plate 122 incident by the light emitted from the fluorescent lamp 126 exhibits a spectrum of yellow and red showing high luminance of 2200-4400 nt, and in some cases, 7700 nt of luminance. A blue spectrum is also shown.

In addition, it can be seen that the farther away from the light incident portion of the light guide plate 122, a black spectrum showing a lower luminance of 1100 nt or less appears.

In this case, the graph next to the spectral analysis picture is a graph showing the amount of light according to the luminance of the spectral analysis picture, and the light guide plate 122 having the highest luminance in which the spectrums of yellow and red are shown. It can be seen that the amount of light at the light incidence portion also has the maximum luminous intensity.

The maximum luminous intensity is a lot of light incident on the light guide plate 122 has a high peak and a pointed shape, thereby, it can be seen that the amount of light incident to the light guide plate 122 is abundant.

In addition, it can be seen that the half width of the spectrum (spectrum half bandwidth) is thinner than the half width of the spectrum analysis picture of Figure 3, due to this, it can be seen that the difference between the human sense of color is small.

As described above, the reflection mirror 146 further configured in the concave lens shape inside the lamp housing 140, so that the light emitted from the outside of the fluorescent lamp 126 is formed in the lamp housing 140 ( In the process of being reflected back to 144 and re-incident to the light incident part of the light guide plate 122, some of the light that is diffusely reflected by the outside of the fluorescent lamp 126 is totally reflected by the plurality of reflection mirrors 146 to be reflected back into the light guide plate 122. By being incident, light loss can be minimized and more light can be incident into the light guide plate 122.

The present invention is not limited to the above embodiments, and various modifications can be made therein without departing from the spirit of the present invention.

As described above, by further forming a reflective mirror configured in a concave lens shape in the lamp housing according to the present invention, some of the light diffused by the reflective reflection in the lamp housing is totally reflected by the plurality of reflective mirrors and re-injected into the light guide plate, There is an effect that can minimize the loss of, and also has the effect of injecting a greater amount of light into the light guide plate.

Claims (6)

Covertum; A support main formed on the cover bottom and having a rectangular shape; A fluorescent lamp arranged along the longitudinal direction of one edge of the support main; A lamp housing guiding the fluorescent lamp and including a plurality of reflection mirrors therein; A reflection plate formed on the cover bottom and configured on one side of the fluorescent lamp; A backlight unit including a light guide plate mounted on the reflection plate; A liquid crystal panel mounted on the backlight unit; The top cover which is bounded by the edge of the liquid crystal panel and assembled to the support main and cover bottom The lamp housing includes a first surface, a second surface parallel to the first surface, and a third surface perpendicular to the first and second surfaces, and the third surface includes a reflective layer. And a plurality of reflective mirrors formed in upper and lower regions of the reflective layer that do not correspond to the fluorescent lamps. The method of claim 1, The backlight unit further comprises a plurality of optical sheets interposed on the light guide plate. delete The method of claim 1, And the reflection mirror has a concave lens shape. The method of claim 1, The plurality of reflective mirrors are configured along the longitudinal direction of the lamp housing. The method of claim 1, The reflective mirror is a liquid crystal display module, characterized in that using a metal having a reflectance of 95% or more containing silver (Ag) and aluminum (Al).

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