KR100705702B1 - Color mixing lens for display and backlight device equipped with the same - Google Patents

Abstract

The present invention forms and mounts a color-mixed lens with a polygonal pyramid having a high refractive index, thereby realizing high brightness in a large display device having a large area, increasing light condensing efficiency of the light source, and minimizing the loss of the light source to uniform light. It is a feature of the present invention to provide a color mixing lens for display and a backlight device equipped with the same.

To this end, the display backlight device of the present invention is a plurality of color mixing lenses arranged side by side at a constant interval, a plurality of LED lenses arranged side by side at a constant interval with each other, the color mixture lens, LED lens It comprises a diffusion sheet installed on the upper, and the frame for fixing and supporting the color mixing lens, LED lens and the diffusion sheet, the color mixture lens is triangular pyramidal shape so that the light source is easily reflected back; It is characterized in that the protruding into any one of the polygonal pyramidal bodies such as pyramidal (pyramid), pentagonal pyramidal, hexagonal pyramidal, heptagonal pyramidal and octagonal pyramidal.

Liquid Crystal Display, Color Mixing Lens, Backlight Device, LED, Light Emitting Diode, High Brightness, Uniformity

Description

Color mixing lens for display and backlight device equipped with it {COLOR MIXTURE LENS FOR DISPLAY AND BACKLIGHT UNIT HAVING A THEREOF}

1 is an exemplary view showing a square pyramid (pyramid type) of the polygonal pyramidal bodies to explain the present invention,

Figure 2 is an illustration showing a hexagonal pyramid of the polygonal pyramidal body according to the present invention,

3 is an exemplary view showing an octagonal pyramid among the polygonal pyramidal bodies according to the present invention;

4 is a configuration diagram for explaining a backlight device implemented by the present invention;

5 is a schematic illustration showing an embodiment of an LED lens according to the present invention;

6 is an exemplary view for explaining an embodiment of an LED lens according to the present invention;

7 is an enlarged view illustrating an arrangement state of a color mixing lens and an LED lens implemented by the present invention;

<Description of the code | symbol about the principal part of drawing>

10: color mixing lens

20: LED lens

21: LED Insertion Groove

22: LED

30: diffusion sheet

40: frame

100: backlight device

The present invention relates to a color mixing lens for a display and a backlight device having the same.

In more detail, a lens having a large refractive index with a high refractive index is formed by mounting a lens (hereinafter referred to as a 'color mixing lens') that reflects the emitted light source and emits light at a predetermined angle so that colors are mixed with each other. The present invention relates to a color mixing lens for a display and a backlight device having the same, to increase the light condensing efficiency of a light source so as to realize high brightness in a large display device and to improve the uniformity of minimizing the loss of the light source.

Recently, as consumers' desire for large size and high resolution display devices increases, development of thin flat panel display devices in place of weight and bulk CRT (Cathode Ray Tube) is urgently needed, and one of such flat display devices has developed a liquid crystal display device. It became.

Such a liquid crystal display device requires a backlight unit (BackLight Unit), which is a separate light source because it displays a screen by using a liquid crystal (liquid crystal) that does not emit light by itself, and recently, a large area and high resolution liquid crystal display In order to realize the device, improvement of screen brightness, efficiency, power consumption, optical uniformity, color reproducibility, viewing angle, thin structure, and price competitiveness are urgently required.

On the other hand, the quality of the screen in the liquid crystal display device is absolutely affected by the light source. This is because the liquid crystal display itself does not have a light emitting capability. Therefore, the liquid crystal of the conventional TN mode (Twisted Nematic Mode) or the STN mode (Super Twisted Nematic Mode) is mainly the reflection type using an external light source.

However, as the screen becomes larger and the consumer demand for high quality increases, the backlight method that installs a light source on the back of the screen and displays an image as light passes through the liquid crystal panel rather than installing a light source in front or side. CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), etc. are used as the light source.In particular, CCFL (Cold Cathode Fluorescent Lamp), which has long life, low power consumption, and can be manufactured thinly, is used. Mainly used.

The light source may be installed in a direct type so that a plurality of light sources directly illuminate the screen, or may be installed in at least one side of the liquid crystal panel in an edge manner to illuminate the screen by a light guide plate and a reflecting plate. In this case, a diffusion sheet may be provided between the liquid crystal panel and the light source in order to increase luminance uniformity of the screen.

However, in the case of a cold cathode fluorescent lamp used in a large display device, since the main component of the gas encapsulated in the discharge tube is mercury, it is easy to form amalgam by combining with a metal, thereby reducing the lifetime of the lamp, and changing the temperature. There was a problem that the change in brightness is severe. In particular, due to the growing interest in the environment, its use has been suggested due to problems such as the disposal of heavy mercury, which is a toxic heavy metal, and above all, the power consumption is high and the number of inverters for each cold cathode fluorescent lamp is individually As a result, the manufacturing cost of the product increased and the brightness was not uniform, which had limitations in implementing various colors.

In addition, the space occupied by the backlight unit is difficult to miniaturize the backlight unit, and as the uniformity of luminance decreases, there is a problem in that the uniformity of light by the diffuser plate needs to be adjusted in proportion to the brightness of the light source.

In order to solve these problems, a backlight unit using LEDs has been developed recently. However, a plurality of LEDs are linearly R, G, B or R, G, G, B or R, G, G, G, B It is mixed with light to make white light. In the case of the LED backlight unit having such a shape, the thickness of the entire backlight becomes thick and a plurality of diffusion plates and diffusion films are required to have a sufficient distance for mixing colors.

In order to solve the above problem, the present applicant filed a patent application No. 2005-53626 (name: LED array lens and a backlight device using the same) of 2005. 06. 21, which is a plurality of LED array lenses mutually The LED array lens is disposed side by side at a predetermined interval, and the LED array lens has a top exit surface and a plurality of LED insertion grooves and the LED is formed so that the light emitting diodes (LED) can be inserted at a predetermined interval from each other on the bottom surface It is configured to include LEDs inserted into the insertion groove, the prior application by the present applicant can implement the uniformity and high brightness of the light to some extent, but the light of more precisely required for the large-area display device that is being enlarged Uniformity and high brightness are required.

The present invention was created to solve various problems of the prior art as described above, and has the following object.

According to the present invention, the color mixing lens is formed into a polygonal pyramid having a high refractive index, thereby realizing high brightness in a large display device having a large area, increasing the light collecting efficiency and color mixing characteristics of the light source, and reducing the loss of the light source. It is an object of the present invention to provide a color mixing lens for a display which minimizes light and improves uniformity of light, and a backlight device having the same.

Hereinafter, the present invention will be described in detail.

In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted, and the following terms will consider functions in the present invention. The terminology set forth herein may vary depending on the intention or convention of the user and producer, and the definition should be made based on the contents throughout the specification.

First, the color mixing lens for display of the present invention is projected into a constant polygonal shape so that the light source to be emitted can easily be emitted to a certain area by making white light using red, green, and blue LEDs at regular intervals through reflection and scattering. It consists of a polygonal pyramid, such as a triangular pyramid, a pyramidal pyramid (pyramid), a pentagonal pyramid, a hexagonal pyramid, a pyramidal pyramid, and an octagonal pyramid, and is composed of a transmissive or reflective resin.

In addition, the display backlight device of the present invention is a backlight device which is installed under the liquid crystal layer and outputs a light source, the plurality of color mixing lenses arranged side by side at regular intervals and are arranged side by side at regular intervals. And a plurality of LED lenses, the color mixing lens, and the diffusion sheet provided on the LED lens, and a frame for fixing and supporting the color mixing lens, the LED lens, and the diffusion sheet.

At this time, the color mixture lens of any one of a polygonal pyramid such as triangular pyramidal, rectangular pyramidal (pyramid), pentagonal pyramidal, hexagonal pyramidal, heptagonal pyramidal and octagonal pyramid so that the light source is easily reflected and mixed Protruding into a polygonal pyramid, consisting of a transmissive or reflective resin, the LED lens has an upper exit surface inclined in a V-shape and is provided with an LED insertion groove so that a light emitting diode (LED) can be inserted into the bottom surface. LED is inserted into the LED insertion groove is mounted.

In addition, the color mixture lens and the LED lens is arranged in an alternating state so as to uniformly diffuse the emitted light source to achieve high brightness, and the light source emitted from the bottom surface of the color mixture lens and LED lens is In order to prevent the loss to the lower surface is provided with a reflective sheet.

EXAMPLE

With reference to the accompanying drawings, a preferred embodiment for achieving the present invention will be described in detail.

First, the present invention, as shown in the accompanying drawings, Figures 1 to 7, Figure 1 is an exemplary view showing a square pyramid (pyramid) of the polygonal pyramid for explaining the present invention, Figure 2 is a polygonal pyramidal body according to the present invention Figure 3 is an exemplary view showing a hexagonal pyramid, Figure 3 is an exemplary view showing an octagonal pyramid of the polygonal pyramidal body according to the present invention, Figure 4 is an embodiment configuration for explaining a backlight device implemented by the present invention, Figure 5 is FIG. 6 is a schematic view showing an embodiment of an LED lens according to the present invention. FIG. 6 is an exemplary view for explaining an embodiment of an LED lens according to the present invention. FIG. 7 is a color implemented by the present invention. Exemplary enlarged views illustrating the arrangement of the mixed lens and the LED lens are shown.

That is, the present invention has a color mixing lens 10 which protrudes into a constant polygonal shape so that the emitted light source can be easily reflected and mixed.

At this time, the color mixture lens 10 is made of any one of a polygonal pyramidal shape, such as triangular pyramidal, tetragonal pyramidal (pyramid), pentagonal pyramidal, hexagonal pyramidal, heptagonal pyramidal and octagonal pyramidal (Attachment drawing) 1 to 3), and the color mixing lens 10 is made of a transmissive or reflective resin.

In addition, the display backlight device 100 of the present invention is a backlight device which is installed under the liquid crystal layer and outputs a light source, and is arranged side by side at a predetermined interval and emits light under the light emitting diode (LED) ( 22, a plurality of LED lenses 20, a plurality of color mixing lenses 10 arranged side by side at a predetermined interval between the LED lens 20, the color mixing lens 10, the LED lens The diffusion sheet 30 is provided on the upper portion of the 20, and the frame 40 for fixing and supporting the color mixing lens 10, the LED lens 20 and the diffusion sheet 30.

At this time, the color mixture lens 10 is a polygonal pyramid, such as triangular pyramidal, rectangular pyramidal (pyramid), pentagonal pyramidal, hexagonal pyramidal, heptagonal pyramidal and octagonal pyramidal shape such that the light source is easily reflected and mixed It protrudes in any one polyhedron shape, and will consist of a transmissive or reflective resin.

In addition, the LED lens 20 has a top emitting surface inclined in a V-shape and is provided with an LED insertion groove 21 so that the light emitting diode (LED) can be inserted into the bottom surface, the LED insertion groove 21 It is to be provided with the LED 22 is inserted into the mounting.

Accordingly, the color mixing lens 10 and the LED lens 20 are arranged in a state in which they are alternately arranged to realize high brightness by uniformly diffusing the emitted light source, and the color mixing lens 10 And the lower surface of the LED lens 20 is provided with a reflective sheet (not shown) to prevent the light source emitted to the lower surface of the lens.

On the other hand, in the configuration of the color mixing lens 10 for display and the backlight device 100 equipped with the present invention can be variously modified and can take various forms. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood that.

First, the present invention is to increase the uniformity of the light source emitted in order to implement high resolution and high brightness for a large-sized display device that is being enlarged.

To this end, the color mixing lens 10 for display is to protrude into a polygonal pyramid of any one of a polygonal pyramidal, such as triangular pyramidal, square pyramidal (pyramid), pentagonal pyramidal, hexagonal pyramidal, heptagonal pyramidal and octagonal pyramidal This is to form a protruding portion in a polygonal surface so as to easily reflect the emitted light source and at the same time return the reflected light source.

Accordingly, the material of the color mixture lens 10 is preferably made of a transmissive or reflective resin, acrylic resins such as polycarbonate or polymethyl methacrylate (PMMA) and resin 20-100% by weight of glass beads based on 100% by weight of the highly translucent resin having a solid content of 5-30%, such as (Resin), and the fine metal particles extracted by 0.05-5% of deposition or machining. , 0.01 to 3% by weight of dye and 0.01 to 5% by weight of UV curing agent may be made of a material or the like, characterized in that the mixture.

In addition, the backlight device 100 equipped with the color mixing lens 10 for display is made of a color mixing lens 10, an LED lens 20, a diffusion sheet 30, and a frame 40.

In this case, the plurality of color mixing lenses 10 are arranged side by side at a predetermined interval to each other, and the plurality of LED lenses 20 are also arranged side by side at a constant interval to each other, which is four Red, Green In other words, it is characterized by having one repeating unit for arranging Blue in a square.

In addition, the diffusion sheet 30 is installed on the color mixing lens 10 and the LED lens 20 to diffuse the light source, and the frame 40 is a color mixing lens 10, LED lens ( 20) and the diffusion sheet 30 is to be stably fixed and supported.

In addition, a reflective sheet is provided on the lower surfaces of the color mixing lens 10 and the LED lens 20, which is to prevent the light source emitted from being lost to the lower surface of the lens.

Here, the LED lens 20 has a top exit surface inclined in a V-shape, the LED insertion groove 21 is provided on the bottom surface. At this time, the LED insertion groove 21 is inserted into the LED 22 to output the light source.

In addition, the LED lens 20, as another embodiment, has an upper exit surface inclined in a V-shape, LED 22 is connected in a state that the LED insertion groove 21 is not provided separately on the bottom surface (See FIG. 5B and FIG. 6B).

In addition, the light mixture output through the LED 22 of the LED lens 20 is uniformly diffused in a state in which the arrangement of the color mixture lens 10 and the LED lens 20 are alternately arranged with each other to achieve high brightness. Will be done.

That is, the LED 22 inserted into and mounted in the LED insertion groove 21 selectively includes a light emitting diode of red (R), green (G), and blue (B), which is illustrated in FIG. 7. As described above, the LED lens 20 may be disposed around the color mixing lens 10 or the color mixing lens 10 may be disposed around the LED lens 20. In the LED 22 of the lens 20, one red (R), two green (G), and one blue (B) light emitting diodes are regularly arranged around one color mixing lens 10. .

When the plurality of color mixing lenses 10 and the plurality of LED lenses 20 are arranged by the regular arrangement as described above, they are shown to be alternately arranged.

As described above, the present invention has the effect of enabling high brightness to be realized in a large display device having a large area and increasing the light condensing efficiency of the light source by forming and mounting the color mixing lens into a polygonal pyramid with a high refractive index. It is effective in reducing the thickness, which is a problem when using the LED.

In addition, the present invention can simultaneously achieve various effects such as maximizing satisfaction and reliability of a display device using the same, due to the effect of minimizing the loss of the light source to improve the uniformity of light.

Claims (12)

delete delete delete A backlight device provided under the liquid crystal layer and outputs a light source; A plurality of LED lenses disposed side by side at regular intervals and provided with light emitting diodes (LEDs) disposed below the light emitting diodes; A plurality of color mixing lenses arranged side by side at regular intervals between the LED lenses to reflect and mix the light emitted from the LED lenses; A diffusion sheet disposed on the color mixing lens and the LED lens; And A frame for fixing and supporting the color mixing lens, the LED lens, and the diffusion sheet; Display device, characterized in that configured to include. The method of claim 4, wherein The color mixing lens is a backlight device for a display, characterized in that the projection is made of a constant polygonal shape so that the light source is easily reflected and mixed. The method according to claim 4 or 5, The color mixing lens is a backlight device for a display, characterized in that consisting of any one of a polygonal pyramid, such as a triangular pyramid, a pyramidal pyramid (pyramid), a pentagonal pyramidal, a hexagonal pyramidal, a seven-horn pyramidal and an octagonal pyramidal. The method according to claim 4 or 5, The color mixing lens is a backlight device for a display, characterized in that consisting of a transmissive or reflective resin. The method of claim 4, wherein The LED lens has a top emitting surface inclined in a V-shape, LED backlight for inserting the light emitting diode (LED) is inserted into the bottom surface, characterized in that the backlight device. The method of claim 4, wherein The LED lens has a top emitting surface inclined in a V-shape, the light emitting diode is connected to the bottom surface is fixed to the display device. delete The method of claim 4, wherein And a reflective sheet is further provided on the bottom surface of the color mixture lens and the LED lens to prevent the light source from being lost to the bottom surface of the lens. In the backlight device which is provided under the liquid crystal layer to output a light source, Light emitting diodes (LEDs) are installed on the lower surface thereof, and a plurality of LED lenses arranged side by side at regular intervals and a plurality of color mixed lenses arranged side by side at regular intervals between the LED lenses, and the color It includes a diffusion lens installed on top of the mixed lens, the LED lens, and a frame for fixing and supporting the color mixture lens, LED lens and the diffusion sheet, The color mixture lens is any one of a polygonal pyramid such as triangular pyramidal, rectangular pyramidal (pyramid), pentagonal pyramidal, hexagonal pyramidal, heptagonal pyramidal and octagonal pyramidal so that the light source can be easily reflected and mixed Protrudes into, and consists of a transmissive or reflective resin, The LED lens is provided with an LED insertion groove for inserting a light emitting diode (LED) into the bottom surface and having an upper exit surface inclined in a V shape, and is provided with an LED inserted into and inserted into the LED insertion groove. The color mixing lens and the LED lens are arranged in an alternating state so as to diffuse the light source uniformly to realize high brightness, and the light source emitted from the bottom surface of the color mixing lens and the LED lens is the lower surface of the lens. Display device, characterized in that the reflective sheet is provided to prevent the loss.

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