KR101203205B1 - Backlight unit having dual display function - Google Patents

Abstract

The present invention discloses a backlight unit having a dual display function. The present invention divides an entire screen of a liquid crystal panel into a main screen area and a sub-screen area so that different images are displayed on the main screen area and the sub-screen area, respectively. On the other hand, when the backlight illumination of the main screen area is off, the mechanical instrument panel provided in the product is projected through the liquid crystal panel of the main screen area, so that the image displayed through the main screen area of the liquid crystal panel is separated and overlapped. To improve the problem while improving the sharpness and reduce eye fatigue more effectively.

Description

BACKLIGHT UNIT HAVING DUAL DISPLAY FUNCTION}

The present invention relates to a backlight unit having a dual display function, and more particularly, to divide an entire screen of a liquid crystal panel into a main screen area and a sub screen area so that different images are displayed on the main screen area and the sub screen area, respectively. On the other hand, when the backlight illumination of the main screen area is off, it relates to a backlight unit having a dual display function to be able to project the instrument panel provided in the product through the liquid crystal panel of the main screen area.

In general, a display device is a device capable of displaying figures, characters, and images of contents to be displayed, and a CRT, a liquid crystal display (LCD), and a PDP are generally used.

Here, the liquid crystal display may display figures, characters, and images embodied in the liquid crystal by irradiating light to the liquid crystal, but may not emit light by itself, and irradiate the liquid crystal panel of the liquid crystal display device with a separate light source to emit an image. It is a device to display. Therefore, the liquid crystal display is provided with a backlight unit to irradiate light to the liquid crystal panel.

Here, the backlight unit is divided into an edge method and a direct method according to the installation position of the lamp, the edge method is a method in which the lamp is arranged on one side or both sides of the light guide plate for guiding the light, the direct method is a number of directly below the light guide plate. Lamps are arranged to irradiate light toward the liquid crystal panel.

The backlight unit is provided with a liquid crystal panel in front of the bottom chassis, and a plurality of lamps and a plurality of sockets for connecting the power inverter and the lamp while the light guide plate is fixed to the bottom chassis are provided therebetween.

For this reason, when the image is implemented by using the light provided from the lamp, the image is expressed only as the image implemented in the liquid crystal panel. There is a problem that can not display the game content at the same time.

Therefore, as shown in Japanese Patent Laid-Open No. 166964 in 2004, it is partitioned into different areas to implement a mechanical image as necessary. The image can be realized in the entire area of the liquid crystal panel while being rearward from a certain area of the liquid crystal panel. There is provided a liquid crystal display device that can be displayed according to the game situation by allowing the instrument panel provided in the.

That is, as shown in FIG. 1, the liquid crystal panel 1 is provided at the front, and the optical film 2 and the light guide member 3 are sequentially provided at the rear of the liquid crystal panel 1, and the light guide member 3 is provided. One side of the edge of the lamp 4 is provided with the light of the lamp 4 is guided toward the liquid crystal panel 3 by the light guide member 3, by the induced light to implement an image on the liquid crystal panel 1, A hole 3a is formed in a part of the light guide member 3 so that the contents of the instrument panel 5 mechanically displayed from the rear thereof can be simultaneously displayed through the hole 3a as necessary.

However, since the instrument panel and the hole 3a of the light guiding member are formed, when the same image is implemented in the entire liquid crystal panel 1, the contrast between the hole forming portion and the portion not forming the hole is not clear and the image is separated. There is.

In addition, when the image is implemented in a part of the liquid crystal panel, that is, the edge region of the liquid crystal panel without holes, and the image is not implemented in the central region where the holes are formed, the instrument panel is formed by the lamp 6 provided at the rear of the instrument panel 5. 5) there is a problem that the image and the display contents of the instrument panel overlap. Therefore, the identification is inferior and the eye fatigue is increased.

The applicant for this application filed a patent application No. 2009-8124 (hereinafter referred to as "prior patent 1") and No. 2009-8125 (hereinafter referred to as "prior patent 2") as 2009.02.02. Prior patents 1 and 2 are further improved.

That is, the present invention divides the entire screen of the liquid crystal panel into a main screen area and a sub screen area so that different images are displayed in the main screen area and the sub screen area, respectively, while the backlight of the main screen area is turned off when the main screen area is turned off. By configuring the mechanical instrument panel provided in the product through the liquid crystal panel of the screen area, it improves the clarity and improves eye fatigue more effectively while improving the problem of separation and overlapping of the image displayed through the main screen area of the liquid crystal panel. It is an object of the present invention to provide a backlight unit having a dual display function that can be reduced.

The backlight unit having a dual display function of the present invention for achieving the above object; First and second light sources for providing backlight illumination to the liquid crystal panel; A light guide panel divided into two or first and second regions to guide backlight illumination of the first light source to the main screen region of the liquid crystal panel and guide backlight illumination of the second light source to the subscreen region of the liquid crystal panel; A rotatable reel-type instrument panel disposed behind the light guide panel and having a third light source provided therein to provide backlight illumination such that the instrument panel is projected from the main screen region of the liquid crystal panel; A first light source guide part positioned at a front side of the light guide panel and switched to a transparent state or an opaque state to transmit backlight illumination of the first and second light sources guided by the light guide panel in a direction of a liquid crystal panel; A second light source guide part disposed at a rear side of the light guide panel and switched to an opaque state or a transparent state to reflect the backlight illumination of the first and second light sources partially guided to the rear side of the light guide panel in a direction of the liquid crystal panel; And the on / off of the first, second and third light sources and the switching of the transparent and opaque states of the first and second light source guides are controlled by the controller.

In addition, the first light source is configured at the upper end of the light guide panel, and the second light source is configured at the lower end of the light guide panel.

In the second region of the light guide plate (LGP), a pattern layer is formed to concentrate the backlight illumination of the second light source only to the sub-screen region of the liquid crystal panel.

In addition, when the backlight illumination of the first light source is not provided to the main screen region of the liquid crystal panel at the boundary of the first and second regions, the backlight illumination of the second light source provided to the subscreen region of the liquid crystal panel is transferred to the first region. It is to form a barrier layer to prevent the induction.

In addition, the first and second light source guides are switched to a transparent state (non-scattering state) that transmits backlight illumination when a voltage is applied under the control of the controller. It is composed of a polymer dispersed liquid crystal (PDLC) which is converted into an opaque state (scattered state) to reflect.

In addition, the first light source guide unit has at least one diffusion sheet, a lens sheet, so as to uniformly diffuse the backlight illumination of the first and second light sources guided from the light guide panel to the main screen region and the sub-screen region of the liquid crystal panel; Any one of the prism sheet and the composite sheet is laminated, or both the diffusion sheet and the lens sheet and the prism sheet are laminated.

The backlight unit may include a housing in which a liquid crystal panel, a light guide panel, first and second light sources, and first and second light source guides are installed.

On the other hand, the fourth, fifth light source for providing a backlight illumination to the liquid crystal panel; A transparent panel divided into two or first and second regions to guide backlight illumination of the fourth and fifth light sources to the main screen region of the liquid crystal panel and guide backlight illumination of the second light source to the subscreen region of the liquid crystal panel; A rotatable reel-type instrument panel located at a rear side of the transparent panel, and having a third light source for providing backlight illumination such that the instrument panel is projected from the main screen region of the liquid crystal panel; A contrast waveguide for reflecting backlight illumination of the fourth and fifth light sources toward the liquid crystal panel; Located between the transparent panel and the contrast waveguide, the backlight illumination of the fourth and fifth light sources, which are induced by being reflected from one surface by the contrast waveguide, is transmitted in a transparent state or an opaque state so as to pass through the transparent panel and diffuse into the liquid crystal panel. A second light source guide unit to be switched; And the on / off of the second, third, fourth, and fifth light sources and the switching of the transparent or opaque state of the second light source guide part to be controlled by the controller.

In addition, the second light source is configured at the lower end of the transparent panel.

In addition, the second region of the transparent panel is configured to form a pattern layer for guiding the backlight illumination of the second light source only to the sub-screen region of the liquid crystal panel.

In addition, when the backlight illumination of the fourth and fifth light sources is not provided to the main screen region of the liquid crystal panel, the backlight illumination of the second light source provided to the subscreen region of the liquid crystal panel is provided at the boundary of the first and second regions. It is to form a barrier layer that prevents induction into the region.

In addition, the light waveguide comprises a light transmissive member for adjusting the transmission and reflection of the backlight illumination of the third light source, the refraction and diffraction such that the instrument panel is projected in the main screen region of the liquid crystal panel when the fourth and fifth light sources are turned off. It is.

In addition, the fourth light source is configured at the upper end of the contrast waveguide, and the fifth light source is configured at the lower end of the contrast waveguide.

In addition, the second light source guide unit is switched to a transparent state (non-scattering state) that transmits the backlight illumination when the voltage is applied under the control of the controller, and reflects the backlight illumination when the voltage is not applied under the control of the controller. It is composed of a Polymer Dispersed Liquid Crystal (PDLC) which is converted into an opaque state (scattered state).

In addition, the transparent panel is made of a flexible polymer material such as acrylic resin (PMMA; Poly Methyl Methacrylate) or polycarbonate (PC).

In addition, the transparent panel includes at least one diffusion sheet, lens sheet, prism sheet, to uniformly diffuse the backlight illumination of the fourth and fifth light sources induced from the light waveguide to the main screen region and the sub-screen region of the liquid crystal panel; Any one of the composite sheets is laminated, or both the diffusion sheet, the lens sheet, and the prism sheet are laminated.

The backlight unit may include a housing in which the liquid crystal panel, the transparent panel, and the second light source guide part are installed.

As such, the present invention divides the entire screen of the liquid crystal panel into a main screen area and a sub-screen area so that different images are displayed in the main screen area and the sub-screen area, respectively, while the backlight is turned off when the backlight of the main screen area is turned off. The instrument panel provided in the product is projected through the liquid crystal panel of the area, which improves sharpness and improves eye fatigue while improving the problem of separation and overlapping of images displayed through the main screen area of the liquid crystal panel. Effective reduction can be expected.

1 is a cross-sectional view showing a backlight unit having a conventional dual display function.
2 is a cross-sectional view showing an operation of the first and second light sources of the backlight unit having a dual display function according to an embodiment of the present invention.
3 is a screen display state in accordance with the operation of the first and second light sources according to an embodiment of the present invention.
4 is a cross-sectional view illustrating an operation of a third light source of a backlight unit having a dual display function according to an embodiment of the present invention.
5 is a screen display state in accordance with the operation of the third light source according to an embodiment of the present invention.
6 is a cross-sectional view illustrating an operation of the first and second light sources of the backlight unit having a dual display function according to another embodiment of the present invention.
7 is a cross-sectional view illustrating an operation of a third light source of a backlight unit having a dual display function according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In describing the present invention, the defined terms are defined in consideration of the function of the present invention, and should not be understood in a limiting sense of the technical elements of the present invention.

2 is a cross-sectional view illustrating an operation of the first and second light sources of a backlight unit having a dual display function according to an embodiment of the present invention, and FIG. 3 is a screen according to the operation of the first and second light sources according to an embodiment of the present invention. 4 is a cross-sectional view illustrating an operation of a third light source of a backlight unit having a dual display function according to an embodiment of the present invention, and FIG. 5 is a screen according to an operation of the third light source according to an embodiment of the present invention. The display state diagram is shown.

2 to 5, the backlight unit having the dual display function according to the exemplary embodiment of the present invention is a rectangular frame and is provided in the housing 100 in which a cross section is bent in a “c” shape. 10, the first, second, and third light sources L1, L2, L3, the light guide panel 20, and the first, second, and third light source guides 30, 40, as well as the instrument panel ( 50) and the control unit 60 is further included.

The liquid crystal panel 10 is composed of a conventional LCD liquid crystal panel, and is configured to display an image by dividing the main screen area A1 and the sub screen area A2 from the entire area of the liquid crystal panel 10.

That is, the same or different images can be displayed in the main screen area A1 and the sub-screen area A2. In particular, the image is changed in the main screen area A1, but the sub-screen area A2 is changed. ) Displays a fixed image continuously.

Accordingly, the main screen area A1 and the sub screen area A2 may be provided with different liquid crystal panels so that different images may be implemented. At this time, the liquid crystal panel 10 corresponding to the main screen area A1 is disposed so as to occupy 4/5 of the entire liquid crystal panel, and the liquid crystal panel 10 corresponding to the sub screen area A2 is the main screen. One or several arrangements thereof are arranged side by side on the lower side of the screen area A1.

The first light source L1 is turned on / off under the control of the controller 60, and is arranged at an upper end side of the light guide panel 20 to the main screen area A1 of the liquid crystal panel 10. It is configured to provide backlight illumination.

The second light source L2 is turned on / off under the control of the controller 60, and is arranged on the lower side of the light guide panel 20 to the sub-screen area A2 of the liquid crystal panel 10. It is configured to provide backlight illumination.

The third light source L3 is turned on / off under the control of the controller 60 and is located inside the instrument panel 50, and the instrument panel is located in front of the main screen area A1 of the liquid crystal panel 10. It is configured to provide backlight illumination to the instrument panel 50 so that 50 is projected.

That is, when the first light source L1 is operated under the control of the controller 60 to provide backlight illumination for image display in the main screen area A1 of the liquid crystal panel 10, the second light source The L2 and the third light source L3 may be turned off under the control of the controller 90, but the second light source L2 is turned on under the control of the controller 60 to operate the liquid crystal panel. In the sub-screen area A2 of FIG. 10, backlight illumination for image display may be provided.

In this case, when the backlight is provided to the instrument panel 50 by the third light source L3, the first light source L1 must be turned off under the control of the controller 60. This is for the instrument panel 50 to be projected and displayed as shown in FIG. 5 attached to the main screen area A1 of FIG. 10.

On the contrary, when backlight illumination is provided to the main screen area A1 of the liquid crystal panel 10 by the first light source L1, the third light source L3 is necessarily turned off under the control of the controller 60. This is to allow an image to be displayed without projecting the instrument panel 50 as shown in FIG. 3 attached to the main screen area A1 of the liquid crystal panel 10.

The first, second, and third light sources L1, L2, and L3 may be provided as one of a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED).

The light guide panel 20 has a shape corresponding to the main screen area A1 and the sub-screen area A2 of the liquid crystal panel 10, and as the main screen area A1 of the liquid crystal panel 10. The first and second regions of the first and second light sources L1 and the first and second regions (1, 2, and 2) are configured to induce backlight illumination of the second light source L2 to the sub-screen area A2 of the liquid crystal panel 10. It is divided into B1) and (B2).

In this case, the pattern layer 51 is formed in the second region B2 so as to concentrate the backlight illumination of the second light source L2 only to the sub-screen area A2 of the liquid crystal panel 10 so as to uniformly diffuse it. will be.

Here, a blocking layer 52 may be formed at a boundary between the first and second areas B1 and B2 to prevent backlight illumination from being transmitted, and the blocking layer 52 may be a main portion of the liquid crystal panel 10. By preventing the backlight illumination of the second light source 30 provided to the sub-screen area A2 of the liquid crystal panel 10 from being guided to the first area B1 when no backlight illumination is provided to the screen area A1. This is to allow the instrument panel 50 to be projected on the main screen area A1 of the liquid crystal panel 10.

The first light source guide part 30 is positioned between the liquid crystal panel 10 and the light guide panel 20 to provide backlight illumination of the first and second light sources guided by the light guide panel 20. When the voltage is applied under the control of the control unit 60 to switch to the transparent state (non-scattering state) or opaque state (scattering state) to transmit in the direction of the liquid crystal panel, the transparent state switching The opacity state switching is performed when no voltage is applied under the control of the controller 60 to reflect the backlight illumination.

Accordingly, the first light source guide part 30 is composed of a polymer dispersed liquid crystal (PDLC).

The second light source guide part 40 is located at the rear side of the light guide panel 20, and the backlights of the first and second light sources L1 and L2 are partially guided to the rear side of the light guide panel 20. Illumination is switched to an opaque state or a transparent state to reflect the direction of the liquid crystal panel 10, the transparent state switching is made when a voltage is applied under the control of the control unit 60 to transmit the backlight illumination, The opacity state switching is performed when no voltage is applied under the control of the controller 60 to reflect the backlight illumination.

Although not shown in the drawing, the first light source guide part 30 includes backlight illumination of the first and second light sources L1 and L2 guided from the light guide panel 20. At least one of the diffusion sheet, the lens sheet, the prism sheet, and the composite sheet is laminated or configured so as to uniformly diffuse while penetrating into the A1 and the sub-screen area A2, or the diffusion sheet, the lens sheet, and the prism sheet All were laminated | stacked.

In this case, the second light source guide part 40 is the control unit when the instrument panel 50 is to project to the main screen area A1 of the liquid crystal panel 10 through the backlight illumination of the third light source L3. Under the control of 60, a voltage is applied to switch to a transparent state.

Accordingly, the controller 60 may display the first, second, and third light sources L1 such that the display panel is projected through the liquid crystal panel 10 as well as the image display on the liquid crystal panel 10. While controlling the on / off of (L2) and (L3), it is configured to control the voltage application state for the transparent state and the opaque state switching operation of the first and second light source guides 30 and 40.

The instrument panel 50 is a rotatable reel-type structure in which a third light source L3 is installed inside, and when the backlight illumination is provided by the third light source L3, the main screen area of the liquid crystal panel 10 ( In A1), the instrument panel 50 is projected.

That is, the instrument panel 50 is a phrase or a pattern and a figure to be displayed at a predetermined angle interval, such as the instrument panel 50 includes a reel driving means not shown to rotate the instrument panel of a separate reel form. do. Here, the instrument panel 50 and the reel driving means not shown are well-known techniques, and the instrument panel 50 may be provided in a plate shape without limiting the instrument panel 50 to a reel form, and the third light source L3 may rear the instrument panel 50. Is provided to increase the brightness from the front by illuminating, according to the instrument panel 50 is composed of a plate material of a relatively thin 1mm or less synthetic resin so that the brightness can be improved by the third light source (L3).

Therefore, as shown in FIGS. 2 and 3, when the advertisement or the guidance image is to be implemented through the main screen area A1 of the liquid crystal panel 10, the controller 60 firstly controls the second and third light sources. In the state in which L2) (L3) is turned off, the first light source guide part 30 applies a voltage to switch to a transparent state, and applies a voltage to the second light source guide part 40 to switch to an opaque state. 1 Turn on the light source L1.

Then, the backlight illumination generated from the on operation of the first light source L1 is guided in the direction of the liquid crystal panel 10 through the first area B1 of the light guide panel 20, as well as the first area B1. Backlight illumination partially leaking toward the rear side of the) is reflected through the second light source guide part 40 to be guided in the direction of the liquid crystal panel 10.

Accordingly, the backlight illumination diffuses while passing through the first light source guide part 30, thereby improving the luminance of the main screen area A1 of the liquid crystal panel 10. In the screen area A1, a desired image can be displayed clearly.

In addition, when the image display is performed through the main screen area A1 of the liquid crystal panel 10, the liquid crystal panel 10 also uses the same image as the main screen area A1 through the sub-screen area A2. Different images may be displayed, and accordingly, the controller 60 turns on the second light source L2.

Then, the backlight illumination generated from the on operation of the second light source L2 is guided in the direction of the liquid crystal panel 10 through the pattern layer 51 provided in the second region B2 of the light guide panel 20. The backlight illumination partially leaking to the rear side of the second area B2 is reflected by the second light source guide part 40 to be guided in the direction of the liquid crystal panel 10.

As a result, the guided backlight illumination diffuses while passing through the first light source guide part 30, thereby improving the luminance of the sub-screen area A2 of the liquid crystal panel 10, the liquid crystal panel 10. In the sub-screen area A1, the desired image can be displayed clearly.

In addition, when the display of the image is not performed in the main screen area A1 of the liquid crystal panel 10, the controller 60 turns off the first light source L1.

Then, not only the image display is performed through the sub-screen area A2 of the liquid crystal panel 10, but also the main screen area A1 of the liquid crystal panel 10 can project the inside of the main screen area. Although it is blurred through A1, the instrument panel 50 can be observed.

4 and 5, when the instrument panel 50 is projected to the main screen area A1 of the liquid crystal panel 10 to be displayed, first, the control unit 60 includes the first and second parts. In the state where the light sources L1 and L2 are turned off, a voltage is applied to the first and second light source guides 30 and 40 to switch to the transparent state, while the third light source L3 is turned on.

Then, the backlight illumination generated from the on operation of the third light source L3 is provided to the instrument panel 50, and the backlight of the third light source L3 is displayed in the main screen area A1 of the liquid crystal panel 10. As the instrument panel 50 is clearly projected from the illumination, the display of the instrument panel 50 can be made in the main screen area A1.

6 and 7 illustrate another embodiment of the present invention, in which the backlight of the fourth and fifth light sources L4 and L5 is illuminated through the contrast waveguide to display the main screen area A1 of the liquid crystal panel 10. And to provide the backlight illumination of the second light source L2 to the sub-screen area A2 of the liquid crystal panel 10, which is the same as in FIGS. 2 to 5 which are embodiments of the present invention. The parts are designated by the same reference numerals.

That is, according to another embodiment of the present invention, the fourth and fifth light sources L4 and L5 for providing backlight illumination to the liquid crystal panel 10 and the main screen area A1 of the liquid crystal panel 10 may be used as the fourth light source. 5 divided into two first and second regions B1 and B2 which induce backlight illumination of the light source and induce backlight illumination of the second light source L2 to the sub-screen area A2 of the liquid crystal panel 10. A third panel providing backlight illumination such that the instrument panel 50 is projected on the transparent panel 70 and a rear side of the transparent panel 70 and located inside the main screen area A1 of the liquid crystal panel 10. Rotatable reel-type instrument panel 50 in which the light source L3 is installed, and a contrast waveguide 80 reflecting the backlight illumination of the fourth and fifth light sources L4 and L5 in the direction of the liquid crystal panel 10, In addition, the light waveguide is positioned between the transparent panel 70 and the light waveguide 80 and is reflected by one surface of the light waveguide 80. The second light source guide part 40 is converted into a transparent state or an opaque state so that the backlight illumination of the fourth and fifth light sources L4 and L5 passes through the transparent panel 70 and diffuses into the liquid crystal panel 10. It is configured to include.

In this case, when the fourth and fifth light sources L4 and L5 are turned off, the contrast waveguide 80 is configured to project the instrument panel in the main screen area A1 of the liquid crystal panel 10. A light transmissive body 81 that adjusts the transmission and reflection of the backlight illumination and the refraction and diffraction is configured.

In addition, in the second area B2 of the transparent panel 70, the backlight illumination of the second light source L2 is concentrated to induce only the sub-screen area A2 of the liquid crystal panel 10 so as to spread the pattern evenly. Layer 71 is formed.

That is, in another embodiment of the present invention, as shown in FIGS. 3 and 6, when the advertisement or guidance image is to be implemented through the main screen area A1 of the liquid crystal panel 10, the controller 60 first. While the second and third light sources L2 and L3 are turned off, a voltage is applied to the second light source guide part 40 to switch to a transparent state, while the fourth and fifth light sources L4 and L5 are turned on. Operate.

Then, the backlight illumination generated from the on operation of the fourth and fifth light sources L4 and L5 is guided in the direction of the liquid crystal panel 10 through the light waveguide 80 forming the light transmissive member 81.

Accordingly, the backlight illumination is diffused while passing through the second light source guide part 40 and the transparent panel 70 to improve the brightness of the main screen area A1 of the liquid crystal panel 10. The liquid crystal panel In the main screen area A1 of (10), the desired image can be displayed clearly.

In addition, when the image display is performed through the main screen area A1 of the liquid crystal panel 10, the liquid crystal panel 10 also uses the same image as the main screen area A1 through the sub-screen area A2. Different images may be displayed, and accordingly, the controller 60 turns on the second light source L2.

Then, the backlight illumination generated from the on operation of the second light source L2 is guided in the direction of the liquid crystal panel 10 through the pattern layer 71 provided in the second region B2 of the transparent panel 70. The backlight illumination partially leaking to the rear side of the second area B2 is reflected by the second light source guide part 40 to be guided in the direction of the liquid crystal panel 10.

Accordingly, the guided backlight illumination is diffused while passing through the transparent panel 70 to improve the luminance of the sub-screen area A2 of the liquid crystal panel 10, and thus the sub-screen of the liquid crystal panel 10. In the area A2, the desired image can be displayed clearly.

In addition, when the image is not displayed in the main screen area A1 of the liquid crystal panel 10, the controller 60 turns off the fourth and fifth light sources L4 and L5.

Then, not only the image display is performed through the sub-screen area A2 of the liquid crystal panel 10, but also the main screen area A1 of the liquid crystal panel 10 can project the inside of the main screen area. Although it is blurred through A1, the instrument panel 50 can be observed.

Meanwhile, as shown in FIGS. 5 and 7, when the instrument panel 50 is projected onto the main screen area A1 of the liquid crystal panel 10 and is to be displayed, first, the controller 60 is the fourth and fifth. In the state where the light sources L4 and L5 are turned off, a voltage is applied to the second light source guide part 40 to switch to a transparent state, while the third light source L3 is turned on.

Then, the backlight illumination generated from the on operation of the third light source L3 is provided to the instrument panel 50, and the backlight of the third light source L3 is displayed in the main screen area A1 of the liquid crystal panel 10. As the instrument panel 50 is clearly projected from the illumination, the display of the instrument panel 50 can be made in the main screen area A1.

The technical idea of the backlight unit having the dual display function of the present invention has been described above with the accompanying drawings, but this is only illustrative of the best embodiments of the present invention and is not intended to limit the present invention.

Accordingly, it is a matter of course that various modifications and variations of the present invention are possible without departing from the scope of the present invention. And are included in the technical scope of the present invention.

10; Liquid crystal panel 20; Light guide panel
30; First light source guide portion 40; Second light source guide
50; Instrument panel 60; The control unit
70; Transparent panel 80; Contrast Waveguide
100; housing

Claims (17)

First and second light sources for providing backlight illumination to the liquid crystal panel;
The backlight is divided into first and second regions to induce backlight illumination of the first light source to the main screen region of the liquid crystal panel, and to induce backlight illumination of the second light source to the subscreen region of the liquid crystal panel. A light guide panel forming a pattern layer for guiding the backlight illumination of the second light source only to the sub-screen area of the liquid crystal panel;
A rotatable reel-type instrument panel disposed behind the light guide panel and having a third light source provided therein to provide backlight illumination such that the instrument panel is projected from the main screen region of the liquid crystal panel;
A first light source guide part positioned at a front side of the light guide panel and switched to a transparent state or an opaque state to transmit backlight illumination of the first and second light sources guided by the light guide panel in a direction of a liquid crystal panel;
A second light source guide part disposed at a rear side of the light guide panel and switched to an opaque state or a transparent state to reflect the backlight illumination of the first and second light sources partially guided to the rear side of the light guide panel in a direction of the liquid crystal panel; And including
A backlight unit having a dual display function, wherein the on / off of the first, second and third light sources and the switching between the transparent and opaque states of the first and second light sources are controlled by a controller. The backlight unit of claim 1, wherein the first light source is configured at an upper end of the light guide panel, and the second light source is configured at a lower end of the light guide panel. delete The backlight unit of claim 1, wherein the backlight of the second light source provided to the sub-screen area of the liquid crystal panel is provided at the boundary between the first and second areas when the backlight of the first light source is not provided to the main screen area of the liquid crystal panel. A backlight unit having a dual display function, wherein a blocking layer is formed to prevent the first area from being guided. The method of claim 1, wherein the first and second light source guides are switched to a transparent state (non-scattered state) through which backlight illumination is transmitted when voltage is applied under the control of the controller, and when the voltage is not applied under the control of the controller. And a polymer dispersed liquid crystal panel (PDLC), which is converted into an opaque state (scattered state) so as to reflect the backlight illumination. According to claim 1, wherein the first light source guide portion at least one diffusion sheet to uniformly diffuse the backlight illumination of the first and second light sources guided from the light guide panel to the main screen area and the sub-screen area of the liquid crystal panel. The backlight unit having the dual display function, wherein any one of the lens sheet, the prism sheet, and the composite sheet is laminated, or the diffusion sheet, and the lens sheet and the prism sheet are laminated. The backlight unit of claim 1, wherein the backlight unit comprises a housing in which a liquid crystal panel, a light guide panel, first and second light sources, and first and second light source guides are installed. Fourth and fifth light sources for providing backlight illumination to the liquid crystal panel;
The backlight is divided into first and second regions to induce backlight illumination of the fourth and fifth light sources to the main screen region of the liquid crystal panel and to induce backlight illumination of the second light source to the subscreen region of the liquid crystal panel. A transparent panel forming a pattern layer for guiding the backlight illumination of the second light source only to the sub-screen area of the liquid crystal panel;
A rotatable reel-type instrument panel located at a rear side of the transparent panel, and having a third light source for providing backlight illumination such that the instrument panel is projected from the main screen region of the liquid crystal panel;
A contrast waveguide for reflecting backlight illumination of the fourth and fifth light sources toward the liquid crystal panel;
Located between the transparent panel and the contrast waveguide, the backlight illumination of the fourth and fifth light sources, which are reflected from one surface by the contrast waveguide and guides, is transmitted in a transparent state or an opaque state so as to pass through the transparent panel and diffuse into the liquid crystal panel. A second light source guide unit to be switched; And including
The on / off of the second, third, fourth, fifth light sources and the switching of the transparent state or the opaque state of the second light source guide unit are controlled by the control unit. The backlight unit of claim 8, wherein the second light source is configured at a lower end of the transparent panel. delete The backlight unit of claim 8, wherein the backlight of the second and second light sources provided to the sub-screen area of the liquid crystal panel when the backlight of the fourth and fifth light sources is not provided to the main screen area of the liquid crystal panel. A backlight unit having a dual display function, characterized in that a blocking layer is formed to prevent illumination from being directed to the first area. 9. The light source of claim 8, wherein the contrast waveguide includes light for adjusting the transmission and reflection of backlight illumination of the third light source, the refraction and diffraction such that the instrument panel is projected on the main screen area of the liquid crystal panel when the fourth and fifth light sources are turned off. A backlight unit having a dual display function, comprising a transmissive reflector. 13. The backlight unit of claim 12, wherein the fourth light source is configured at an upper end of the contrast waveguide, and the fifth light source is configured at a lower end of the contrast waveguide. The method of claim 8, wherein the second light source guide portion is converted to a transparent state (non-scattering state) that transmits the backlight illumination when the voltage is applied under the control of the control unit, the backlight when the voltage is not applied under the control of the control unit A backlight unit having a dual display function, comprising a polymer dispersed liquid crystal (PDLC) which is converted into an opaque state (scattered state) to reflect an illumination. The backlight unit of claim 8, wherein the transparent panel is made of a flexible polymer material such as acrylic resin (PMMA; Poly Methyl Methacrylate) or polycarbonate (PC). The method of claim 15, wherein the transparent panel has at least one diffusion sheet, lens sheet, prism sheet, to uniformly diffuse the backlight illumination of the fourth and fifth light sources derived from the light waveguide to the main screen area of the liquid crystal panel, And any one of the composite sheets is laminated, or both the diffusion sheet, the lens sheet, and the prism sheet are laminated. The backlight unit of claim 8, wherein the backlight unit comprises a housing in which the liquid crystal panel, the diffusion panel, and the second light source guide part are installed.

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