WO2007105739A1

WO2007105739A1 - Backlight device and liquid crystal display device

Info

Publication number: WO2007105739A1
Application number: PCT/JP2007/055005
Authority: WO
Inventors: Kazuhiko Kasano; Tomoko Akai
Original assignee: Display Tech 21, Corporation; National Institute Of Advanced Industrial Science And Technology
Priority date: 2006-03-14
Filing date: 2007-03-13
Publication date: 2007-09-20
Also published as: JPWO2007105739A1; JP5051853B2

Abstract

[PROBLEMS] To provide a backlight device, which improves light use efficiency, can be easily controlled and achieves high resolution and high contrast without luminance nonuniformity, and to provide a liquid crystal display device. [MEANS FOR SOLVING PROBLEMS] A backlight device (1a) is provided with an ultraviolet generating section (3a); a visible light conversion section (16) for converting ultraviolet emitted from the ultraviolet generating section (3a) into visible light; and a transparent flat plate medium section (2a) for propagating the visible light emitted from the visible light conversion section (16). The visible light conversion section (16) is provided in independent three systems, the systems convert ultraviolet into red light, green light and blue light, respectively. The flat plate medium section (2a) is independently arranged over the visible light conversion section (16) with spaces among the three layers or without a space, corresponding to the visible light conversion section independently arranged in the three systems.

Description

Specification

Backlight device and liquid crystal display device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a backlight device used for a non-light emitting display such as a liquid crystal and a liquid crystal display device using the same, and in particular, emits red, green, and blue as three primary colors of light as a backlight. The present invention relates to a backlight device on which fluorescent light emitting glass is mounted and a liquid crystal display device using the backlight device.

Background art

[0002] LCD (Liquid Crystal Display), which is a non-luminous display, has a backlight device on the back, and the three primary colors of the first polarizing plate, liquid crystal cell, and light are arranged independently in a plane. The most common method is visualization through a Luller filter and a second polarizing plate.

For this backlight device, white light including the three primary colors of light is most suitable. Although it is important to increase the brightness of the light source for a bright screen, it is important to increase the brightness of the light source. At present, only 2 to 3% of the light emitted by the knock light device with a large light transmission loss in the filter reaches the eyes of the observer, and the potential issue of low light utilization efficiency was there.

Various improvements have been made for such problems.

[0003] For example, Patent Document 1 describes a liquid crystal display device of the type called “liquid crystal display device” in which a phosphor is disposed on the back surface or the surface of a liquid crystal display element and an ultraviolet light source is used as a light source. An invention is disclosed in which a visible reflector for reflecting visible light, which is scattered light in all directions emitted from phosphor power, is arranged.

In the liquid crystal display device configured as described above, the light utilization efficiency from the phosphor can be improved, and the luminance of the liquid crystal display device can be improved without increasing the power consumption.

In addition, Patent Document 2 discloses a “liquid crystal display device” filed at substantially the same time as the same applicant as Patent Document 1.

The present invention, like the invention disclosed in Patent Document 1, improves the light utilization efficiency of the backlight device, and further provides a high-definition, high-contrast liquid crystal display device. The structure is that a phosphor that emits light of the same color as that of the color filter is dispersed in the color filter and excited and emitted by ultraviolet and blue light emitted from a fluorescent tube, and the phosphor color filter is liquid crystal. It arrange | positions outside a polarizing plate with respect to a layer.

Thus, by including the phosphor in the color filter and disposing it outside of the polarizing plate, it is possible to improve the transmittance that decreases in the color filter, and to achieve high contrast.

[0005] Patent Document 3 has the name "color liquid crystal display device", a transflective liquid crystal display panel, a front light disposed on the front surface side of the liquid crystal display panel, and a rear surface side of the liquid crystal display panel. An invention with a positioned backlight is disclosed. The front light has red, green, and blue LEDs (light emitting diodes) that can emit the three primary colors of light, and red and green as the back light source that can emit the three primary colors of light in the backlight. A blue LED is provided, a controller that controls the front-side light source and back-side light source to irradiate the liquid crystal panel side with light from each light source as alternating light, and a liquid crystal synchronized with the alternating light. A control circuit for controlling display on the display panel is provided.

By adopting such a configuration, display in a reflective field sequential method can be performed in a bright place, and display in a transmissive field sequential chanel method can be performed in a dark place.

As described in Japanese Patent Application Laid-Open No. 11-14988, this field sequential method is such that red light, green light, and blue light are sequentially turned on at a high speed, and a TN (twisted nematic) type according to them. A liquid crystal display panel displays monochrome images. In order to prevent eye flickering (flickering force) due to color switching by this method, three colors are one frame time (one set screen display time for three colors), ie about lZ60s. That is, the color is switched at about 1 / I80s per color, that is, about 6ms. Also, for example, if 2Z3 is assigned to the switching of each color image, that is, the electrical writing of the image and the response of the liquid crystal, and the backlight is turned on for the remaining 1/3 time, It is stated that if lms is assigned to electrical writing, the response time of the liquid crystal must be within 3 ms.

[0006] Finally, in Patent Document 4, the light source of the backlight unit is named red as “liquid crystal display device”. Consists of color light emitting diodes, green light emitting diodes, and blue light emitting diodes. The number of each light emitting diode used is equal to or greater than the number of red light emitting diodes and the number of green light emitting diodes. It is characterized by that. The invention disclosed in Patent Document 4 also adopts a field sequential method as in Patent Document 3, and uses an LED as a light source. Specifically, as disclosed in FIG. 1 of Patent Document 4, as the backlight unit, LEDs of three colors, red, green, and blue, and a light guide that guides the light emitted from these LEDs to the liquid crystal. Department.

However, the invention disclosed in Patent Document 4 defines the number of use in order to meet the user's needs that each bluish white color is preferred for each LED. By configuring as described above, it is possible to provide a liquid crystal display device that meets the needs of users.

Patent Document 1: Japanese Unexamined Patent Publication No. 2003-287746

Patent Document 2: JP 2003-255320 A

Patent Document 3: Japanese Patent Laid-Open No. 2005-338485

Patent Document 4: Japanese Patent Laid-Open No. 2002-196323

Disclosure of the invention

Problems to be solved by the invention

[0007] However, the conventional techniques described in Patent Document 1 and Patent Document 2 can certainly prevent light attenuation in the color filter, but one pixel (as a display unit of a liquid crystal display device) In order to cover the phosphors of each of the three primary colors for a pixel), one cell must be divided into three to control the light emission of a 1/3 size color filter.

The control of the light emission of this 1/3 phosphor will be described with reference to FIG. 7 based on the conventional control method of the color liquid crystal display device.

FIG. 7 is a conceptual diagram schematically showing a light emission state of a conventional liquid crystal display device. In FIG. 7, the backlight device 51 is provided on the back side of the polarizing plate 52a, and the white light 55 generated by the knocklight device 51 passes through the polarizing plate 52a and is guided to the divided liquid crystal cells 53a to 53c. . The divided liquid crystal cells 53a to 53c include a red color filter 54a, a green color filter 54b, and a blue color filter 54a. The color filters 54c are provided to correspond to the color filters 54c, respectively.

A voltage is applied to each of the divided liquid crystal cells 53a to 53c, causing the liquid crystal molecules to be twisted or twisted. Whether or not light can pass through the two polarizing plates 52a and 52b sandwiching the divided liquid crystal cells 53a to 53c is determined by the degree of the twist. The white light 56 that is twisted by passing through the divided liquid crystal cells 53a to 53c passes through the color filters 54a to 54c to become red light 57a, green light 57b, and blue light 57c, and further passes through the polarizing plate 52b. To Penetrate. When passing through the polarizing plate 52b, the red, green, and blue intensities are adjusted according to the degree of twist generated in the previous divided liquid crystal cells 53a to 53c, resulting in red light 58a, green light 58b, and blue light 58c. In the eyes, these three primary colors are mixed and appear in various colors.

In FIG. 7, the light is indicated by an arrow and the intensity thereof is indicated by the length of the arrow. In order to develop the three primary colors independently, three liquid crystals are used for each of the three color filters. A cell is needed. In FIG. 7, a vertical dotted line is drawn corresponding to one pixel of the display unit. The three cells and filters that exist between the dotted lines exist as a set for these three power pixels.

In the inventions disclosed in Patent Documents 1 and 2, phosphors are used for these three color filters, which are made to emit light with ultraviolet light or blue light. For each pixel of a display unit, 1 There was a problem that one cell had to be divided into three and controlled at 1/3 size.

In other words, both the cell and the color filter have the problem of requiring subpixels with a resolution three times that of the pixels.

[0010] On the other hand, Patent Documents 3 and 4 solve the problems of control complexity and resolution as in the inventions disclosed in Patent Documents 1 and 2 by adopting the field sequential method.

However, in the inventions disclosed in these documents, LEDs are used as the light source of the backlight or the front light, and there is a problem in terms of the uniformity of the light source. As disclosed in Patent Document 4, a backlight device using red (R), green (G), and blue (B) LEDs as a light source is arranged in a number of LEDs that constitute the light source. Is complicated and turn into. In general, there are 4 LED chips even for a small LCD with a size of 0.3mm square, 10 for the medium size, and 1000 for the large size. Many methods have been proposed to distribute the light emitted from the point light source with a clever light guide plate and perform uniform surface illumination. However, Patent Document 3 discloses the method in FIG. 2, and Patent Document 4 discloses the method in FIG. Unevenness still remains in the light from multiple point light sources emitted from the side of the cage, and power consumption, heat generation, and cost due to multiple arrays were issues to be solved.

[0011] The present invention has been made in response to the strong conventional situation, and while improving the light utilization efficiency, it is easy to control and can realize high resolution and high contrast without uneven brightness. And a liquid crystal display device.

Means for solving the problem

In order to achieve the above object, a backlight device according to claim 1 includes an ultraviolet ray generator, a visible light converter that converts ultraviolet rays emitted by the ultraviolet ray generator into visible light, and A backlight device having a transparent flat plate medium portion that propagates visible light emitted by the visible light conversion portion, wherein the visible light conversion portion is provided in three independent systems, each of which converts ultraviolet light into red light. The green plate is converted into green light and blue light, and the flat medium portion is provided with three layers of gaps independently or in layers with no gap corresponding to the three visible light conversion units provided independently. Is.

The backlight device having the above-described configuration has an effect that an ultraviolet ray generator is provided to generate ultraviolet rays, and the visible light converter is independently converted into visible light of the three primary colors of red, green, and blue. In addition, each light converted into red, green, and blue visible light has the effect of independently propagating through the flat plate medium portion.

[0013] Further, the backlight device according to the invention described in claim 2 is the invention according to claim 1, wherein the surface of each of the flat plate media portions provided with three independent layers is provided. A thin film that transmits visible light and blocks ultraviolet rays is formed.

The backlight device having the above-described configuration has an effect of preventing mixing of a flat plate medium portion emitting red, green, and blue colors into a flat plate medium portion emitting other colors due to leakage of ultraviolet rays.

[0014] Further, the backlight device according to claim 3 is the invention according to claim 1. In the invention according to claim 2, the ultraviolet ray generation unit uses an electron emission source as a force sword electrode, an ultraviolet phosphor as an anode electrode, and provides an electron extraction grid to accelerate and accelerate the ultraviolet ray. In the backlight device configured as described above, the ultraviolet light is made to collide with the phosphor, and the ultraviolet phosphor is used as the anode electrode, the electrons generated by the force sword electrode are drawn out by the electron extraction grid, and the ultraviolet light serving as the anode electrode is obtained. It has an effect of generating ultraviolet rays by colliding with a line phosphor.

Claim 3 defines that the ultraviolet ray generator contains an ultraviolet phosphor, but the ultraviolet ray generator does not have an ultraviolet phosphor, and does not have an ultraviolet light emitting diode (UV — LED) or cold cathode fluorescent tube. (CCFL) can also be used. That is, the ultraviolet ray generating part is not limited to those described in claim 3 of the present invention, and any ultraviolet ray source can be used as long as it generates ultraviolet rays.

[0015] The backlight device according to claim 4 is the invention according to claim 1 or claim 2, wherein the flat medium portion is an independent three-layer glass. The visible light conversion units provided independently in three systems are fluorescent materials or fluorescent elements that are introduced into the glass and generate red light, green light, and blue light, respectively. In the backlight device having the above-described configuration, the fluorescent material or fluorescent element that generates red light, green light, and blue light introduced into each of the independent three layers of glass absorbs ultraviolet rays, and each of the three primary colors of light. Has the effect of generating. Note that once converted to visible light, the excitation energy differs even when irradiated on other glass surfaces. In other words, a single color of red, blue, or green is always incident on the LCD panel.

[0016] The backlight device according to claim 5 is the backlight device according to any one of claims 1 to 4, wherein the fluorescent material or the fluorescent element is used. Is doped so as to have a fluorescence intensity distribution opposite to the distribution of the ultraviolet intensity irradiated from the ultraviolet ray generator. Similarly, a reverse fluorescence intensity distribution can be obtained using a technique such as inkjet.

In the backlight device having the above configuration, the fluorescent material or the fluorescent element generates ultraviolet rays. Since it is doped so as to have a fluorescence intensity distribution opposite to the distribution of the UV intensity irradiated from the part, the fluorescent material or the fluorescent element is low in the part where the UV intensity is high, and the fluorescent material is low in the part where the UV intensity is low Alternatively, it has the effect of being doped so that many fluorescent elements are distributed.

[0017] The backlight device according to claim 6 is the backlight device according to any one of claims 1 to 5, wherein the flat surface of the flat plate medium portion is flat. Any one of the planes forms a slope, and as the force away from the vicinity of the ultraviolet ray generator, the area of the cross section formed perpendicular to the one side surface is reduced. Is.

The backlight device having the above-described structure has an effect that ultraviolet rays incident from the end surface of the flat plate medium portion in the vicinity of the ultraviolet ray generating portion are uniformly reflected and scattered by the inclined surface. The slope is formed so that the area of the cross section perpendicular to the plane of the flat plate media portion becomes narrower as it moves away from the ultraviolet ray generator, so the ultraviolet waveguide becomes narrower as it moves away from the ultraviolet ray generator and reflects off the slope. UV light is generated uniformly.

[0018] The backlight device according to claim 7 is the backlight device according to claim 6, wherein the backlight device according to claim 6 emits ultraviolet rays in the vicinity of a slope formed on one flat surface of the flat plate medium portion. The nanoparticles to be reflected are doped, for example titania.

In the backlight device having the above configuration, ultraviolet-reflecting nanoparticles such as titania are doped in the vicinity of the inclined surface formed on one plane of the flat plate medium portion, so that the ultraviolet light reflected on the inclined surface is converted into a fluorescent material or a fluorescent material. It has the effect of promoting scattering before colliding with elements. Titania means titanium dioxide (TiO 2). In addition,

2

Nanoparticles in the present invention refer to nanosized particles in the range of lnm to lOOnm.

[0019] The backlight device according to the invention described in claim 8 is the backlight device according to any one of claims 1 to 7, wherein the liquid crystal portion constituting the display device is red. Receives a control signal synchronized with a control signal for driving light, green light, and blue light so that each color light is transmitted with a time difference, and the above three independent visible lights are provided. The conversion unit includes a backlight light emitting circuit unit that drives the ultraviolet ray generation unit so as to generate the red light, the green light, and the blue light, respectively.

Since the backlight light emitting circuit unit receives the control signal synchronized with the control signal for driving the liquid crystal constituting the display device and the ultraviolet ray generating unit is driven, The liquid crystal optical shutter and the UV light generator are controlled to synchronize with each of the three primary colors of light.

[0020] A liquid crystal display device according to the invention described in claim 9 is an optical shirt comprising the backlight device described in claim 8, a liquid crystal section, and an electrode for applying a voltage to the liquid crystal section. A single layer, a liquid crystal driving circuit unit for generating a voltage applied to the liquid crystal unit, and a synchronizing circuit unit for transmitting a light shutter layer and emitting a backlight for each of the red light, green light, and blue light. And a control unit that transmits a control signal synchronized with each of the liquid crystal driving circuit unit and the backlight light emitting circuit unit.

In the liquid crystal display device having the above configuration, the control unit having the synchronization circuit unit transmits a control signal synchronized with each of the three primary colors of light to the liquid crystal drive circuit unit and the backlight light emitting circuit unit, respectively, so that the three primary colors of light are independent. When the field sequential method is realized by synchronizing the backlight device that emits light with the optical shutter layer, it has a reflexive action.

The invention's effect

In the backlight device according to claim 1 of the present invention, visible light that is the three primary colors of light is independently generated at the same time by an independently configured visible light conversion unit, and simultaneously formed. By propagating through the flat plate media, it is possible to control independently the three colors of red, green and blue as the backlight. In this way, by generating the three primary colors of light in the backlight device, it is possible to realize a color display without using a color filter by using this backlight device.

[0022] Further, in the backlight device according to claim 2 of the present invention, in addition to the effect of the invention according to claim 1, the flat plate medium portion that emits red, green, and blue colors and propagates Therefore, it is possible to prevent the mixture from entering into a flat plate medium portion that emits other colors due to leakage of ultraviolet rays, and the independence of each color can be maintained high.

[0023] In the backlight device according to claim 3 of the present invention, claim 1 or In addition to the effects described in claim 2, can employ the electron emission source for the force sword electrode to generate many electrons. Furthermore, by adopting an electron extraction grid, electrons generated from the force sword can be extracted and accelerated. In addition, by using an ultraviolet phosphor that generates ultraviolet rays by irradiating electrons as an anode electrode, the electrons collide directly and efficiently generate ultraviolet rays, and more efficiently transmit ultraviolet rays to the visible light conversion unit. Can be supplied.

[0024] In the backlight device according to claim 4 of the present invention, the flat plate medium part is an independent three-layer glass, and the three-system independent visible light conversion part is a fluorescent material or fluorescent element introduced into the glass. By doing so, the light can be propagated at the same time as the light is emitted uniformly. In addition, the emission intensity can be freely changed by changing the density of the fluorescent material or fluorescent element introduced into the glass. In addition, this change in density is superior to a point light source in terms of securing space and reducing the size of the backlight device, which has a high degree of freedom and does not require consideration of arrangement and wiring.

In the backlight device according to claim 5 of the present invention, the distribution in the flat plate medium portion of the ultraviolet intensity irradiated from the ultraviolet ray generating portion and the distribution force of the fluorescent material or fluorescent element in the flat plate medium portion cancel each other. As a result, a backlight device having a light emitting surface that generates visible light that is uniform and has no uneven brightness can be provided.

[0026] In the backlight device according to claim 6 of the present invention, ultraviolet rays incident from the end surface of the flat plate medium portion in the vicinity of the ultraviolet ray generating portion are uniformly reflected and scattered by the inclined surface. It is possible to guarantee a uniform UV scattering distribution in the flat plate medium part where the UV light intensity distribution does not occur with respect to the distance from the part, and thus the visible light generated from the fluorescent material and the fluorescent element becomes uniform, A backlight device including a light emitting surface that generates uniform visible light without uneven brightness can be provided.

[0027] In the backlight device according to claim 7 of the present invention, ultraviolet reflection nanoparticles, for example, titania, promotes scattering of ultraviolet rays reflected by the inclined surface, so that more fluorescent materials and fluorescent elements can be obtained. Since more visible light is generated by collision, not only is it uniform, but a backlight device with high brightness can be realized.

[0028] In the backlight device according to claim 8 of the present invention, for each of the three primary colors of light, Since the ultraviolet ray generator is driven by receiving a control signal synchronized with the control signal for driving the liquid crystal constituting the display device, the liquid crystal optical shutter and the ultraviolet ray generator can be synchronized. The three visible light converters, which are independent for each of the three primary colors of light, are also synchronized to synchronize the generation of visible light, which is the three primary colors of light, with the driving of the liquid crystal, so that a color liquid crystal display device can be used without a color filter. A configurable backlight device can be realized.

In the liquid crystal display device according to claim 9 of the present invention, the three primary colors of light are emitted independently by synchronizing the liquid crystal driving circuit unit and the backlight light emitting circuit unit for each of the three primary colors of light. By adopting a field sequential method by synchronizing the backlight device with the optical shutter layer, it is possible to realize a color liquid crystal display device having high definition and high contrast with high light use efficiency without using a color filter.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a backlight device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an addition of an optical shutter layer of a liquid crystal display device to the backlight device according to the present embodiment.

[FIG. 3] (a) is a conceptual diagram schematically showing the structure of a fluorescent glass used in the backlight device according to the present embodiment, and (b) is an enlarged view of a portion indicated by symbol C in the figure. FIG.

[Fig. 4] (a) is a conceptual diagram showing an irradiation distribution of ultraviolet rays when a spot-like ultraviolet light source 28 is used, and (b) is an irradiation distribution in the case of the ultraviolet irradiation distribution shown in (a). It is a conceptual diagram showing a state in which a mask pattern opposite to the distribution is formed. (C) is a conceptual diagram schematically showing the impregnation concentration by impregnating the phosphor solution during the mask pattern shown in (b). is there. Similar effects can be obtained by programming the ink jet apparatus.

FIG. 5 is a conceptual diagram showing a liquid crystal display device according to the present embodiment.

FIG. 6 is a conceptual diagram for explaining light emission control and liquid crystal drive control of the fluorescent glass according to the present embodiment.

FIG. 7 is a conceptual diagram schematically showing a light emission state of a conventional liquid crystal display device.

Explanation of symbols 1 ···· Knock light device la- · Knock light device

2 ... 'Fluorescent glass

2a- ■ Fluorescent glass

2b- '■ · Fluorescent glass

2c- ■ Fluorescent glass

2d-… Fluorescent glass

3- · -UV generator

3a -... UV generator

3b-… UV generator

3c- --UV generator

-· 'Sealing flange

5 •• UV phosphor

··· Electronic extraction grid ··· 'Carbon nanotubes ··' • Sealing material

... '' Grid Power

10 "Anode power supply

1 ··· Sword Cape Nore 2 ··· Grid cable 3 ··· Anode Cape Nore 4 ··· Backlight light emitting circuit section

6- ··· Fluorescent material or fluorescent element 7- · UV shielding film 8 ··· Vacuum container

9- ·-switch la ... Polarizing plate b ... Polarizing plate ... Optical shutter layer ... Synchronous circuit part ... Liquid crystal drive circuit part a ... Electrode cable b ... Electrode cable c ... Electrode cap nore a ... Power cable b ... Power cable ... Phosphor ... UV light source ... UV light waveguide ... Ultraviolet reflective particles ... Liquid crystal display device a ... Glass substrate b ... Glass substrate a ... Alignment film b ... Alignment film ... Liquid crystal part a ... Sealing material b ... Scenery material ... Liquid crystal molecule a ... Wiring electrode b ... Wiring electrode ... Control part ... UV incident light ... UV scattered light a ... Red light 41b ... Green light

41c ... Blue light

42… Visible light

43 ... UV

44 ... Slope

45 ··· UV light source side end face

46 ··· UV light source reverse side end face

51 ... Backlight device

52a ... Polarizing plate

52b ... Polarizing plate

53a… Liquid crystal cell

53b ... Split liquid crystal cell

53c ... Split liquid crystal cell

54a -... Red color filter

54b… Green color filter

54c --- Blue color filter

55 ... White light

56 ... White light

57a ... Red light

57b ... Green light

57c ... Blue light

58a ... Red light

58b ... Green light

58c ... Blue light

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a backlight device according to the best embodiment of the present invention will be described with reference to FIG. 1 and FIG.

FIG. 1 is a cross-sectional view of a backlight device according to an embodiment of the present invention, and FIG. FIG. 6 is a conceptual diagram showing an addition of an optical shutter layer of a liquid crystal display device to the backlight device according to the embodiment.

In FIG. 1, the knocklight device la is roughly divided into a fluorescent glass 2a, an ultraviolet ray generator 3a, and a backlight light emitting circuit section 14.

The fluorescent glass 2a is obtained by introducing a fluorescent material or a fluorescent element 16 into a porous glass that propagates light, and an end of the fluorescent glass 2a is inserted into the ultraviolet ray generator 3a through the sealing flange 4. It is composed. The fluorescent material is a concept including a fluorescent compound, and the fluorescent element is a concept including a fluorescent ion. Examples of the fluorescent material include particulate fluorescent particles.

In addition, the fluorescent glass 2a has a flat plate shape as shown in FIG. 2, and the end of the fluorescent glass 2a inserted into the ultraviolet ray generator 3a is made of ITO (indium tin oxide) using a method such as sputtering. In addition, an ultraviolet phosphor 5 is formed. As the formation method, an electrodeposition method, a printing method, an ink jet method, a dispensing method, or the like may be used if the ultraviolet phosphor 5 is in the form of particles. In the case of a flake shape or a thin plate shape, it can be pasted with a conductive inorganic adhesive. An appropriate heat treatment is performed after the formation.

The fluorescent glass 2a is reinforced and fixed by a sealing material 8 to a glass or ceramic sealing flange 4 having an opening that penetrates without gaps. The vacuum vessel 18 constituting the sealing flange 4 and the ultraviolet ray generator 3a is hermetically sealed with a low melting point alloy or frit glass.

In the fluorescent glass 2a shown in FIG. 1, a particulate fluorescent material or fluorescent element 16 that emits red light when it absorbs ultraviolet rays emitted from the ultraviolet phosphor 5 is introduced. That is, the fluorescent material or fluorescent element 16 functions as a visible light conversion unit.

The ultraviolet ray generator 3a includes a sealing flange 4 and a vacuum vessel 18 in which an electron extraction grid 6 and a carbon nanotube 7 are provided.

A carbon nanotube 7 as an electron emission source is provided as a cathode electrode at the lower end of the inside of the vacuum vessel 18, and generates electrons at a zero potential via the force sword cable 11. On the upper part of the carbon nanotube 7 at a distance of about 100 zm, an electron extraction grid 6 is provided as a Dard electrode. Electrons are effectively extracted by applying a voltage via the power supply 9. As for the voltage, it is considered that a voltage of 50V to 100V is appropriate in the case of the interval of 100 / im.

Further, by applying a positive voltage to the ultraviolet phosphor 5 as the anode electrode by the anode power source 10 via the anode cable 13, the electrons are accelerated and collided with the ultraviolet phosphor 5 to generate ultraviolet rays. This positive voltage should be 3 to 5 times the grid voltage. The electronic lead grid 6 receives the light emission control signal 15 and the switch 19 is operated, and the backlight light emitting circuit unit 14 is controlled so as to apply a voltage via the lid cable 12, and receives the light emission control signal 15. If not, electrons generated in the carbon nanotubes 7 will not pass through the electron extraction grid 6 and reach the ultraviolet phosphor 5.

The generated ultraviolet light travels through the fluorescent glass 2a and collides with the fluorescent material or fluorescent element 16 to generate red light. The fluorescent material or fluorescent element 16 is uniformly distributed in the fluorescent glass 2a, and can emit uniform and uneven red light. The generated red light propagates in the fluorescent glass 2a. That is, the fluorescent glass 2a functions as a flat plate medium portion.

[0034] In the present embodiment, the ultraviolet ray generator 3a is provided only at one end with respect to the fluorescent glass 2a, but this is also provided at the other end of the fluorescent glass 2a in the same manner. According to this, twice the luminance can be obtained.

The fluorescent glass 2a is a backlight device la for generating red light among the three primary colors of light. The normal backlight device 1 is not only red light but also green light as shown in FIG. Fluorescent glasses 2b and 2c that generate colored light and blue light are provided with the same configuration as that shown in FIG. 1, and these three independent systems are provided in three layers. Therefore, ultraviolet rays leak from each fluorescent glass 2a to 2c and enter the other fluorescent glass, and only the ultraviolet rays are transmitted to the surface of the fluorescent glass while transmitting visible light so as not to emit light of other colors. An ultraviolet shielding film 17 is provided without transmission.

[0035] FIG. 2 shows a backlight device 1 in which three fluorescent layers 2a to 2c that emit light of three primary colors of light are provided with three layers stacked at intervals, and further, polarizing plates 21a and 21b And an optical shutter layer 22 configured to be sandwiched between them. Each fluorescent glass 2a ~ 2c The red light, green light, and blue light emitted by the light are controlled by the knock light emitting circuit unit 14, and the backlight light emitting circuit unit 14 is a liquid crystal control signal that drives the liquid crystal unit of the optical shutter layer 22. It is controlled by the synchronized light emission control signal 15. The backlight light emitting circuit section 14 and the ultraviolet ray generator 3 are supplied with electric power through independent electrode cables 25a to 25c in order to cause the fluorescent glasses 2a to 2c to emit light. In FIG. 1, a force sword cable 11, a grid cable 12, and an anode cable 13 are shown as cables for supplying power to the ultraviolet ray generator 3a. The electrode cable 25a in FIG. Cables are shown generically. The same applies to FIG.

[0036] Although the ultraviolet ray generator 3 is integrally formed in this figure, the fluorescent glasses 2a to 2c are caused to emit light independently by electric power supplied independently via the electrode cables 25a to 25c. It is provided independently for each of the fluorescent glasses 2a to 2c. The fluorescent glasses 2a to 2c are provided in three layers with an interval, but this interval is set in terms of the diffusion and attenuation of light emission and the strength of securing the space including the ultraviolet ray generator 3. The force that should be done The three layers may be constructed so as to be in close contact with each other without any gaps.

[0037] As shown in detail in FIG. 5, the optical shutter layer 22 is configured by sandwiching a liquid crystal part with substrate glass or the like, and its driving is controlled by a liquid crystal drive circuit part 24. The liquid crystal drive circuit unit 24 is also controlled by a liquid crystal control signal synchronized with the light emission control signal 15. The power cables 26a and 26b connected from the liquid crystal drive circuit unit 24 to the optical shutter layer 22 are respectively connected to two wiring electrodes (not shown in the figure) provided on both surfaces of the liquid crystal unit.

The liquid crystal control signal that controls the liquid crystal drive circuit unit 24 is synchronized with the time difference emission of the fluorescent glass 2a to 2c provided in three layers, and the liquid crystal unit controls each of red light, green light, and blue light with a time difference. The drive is controlled so as to transmit light, and the liquid crystal unit is operated in a field sequential manner.

[0038] In the backlight device 1 configured as described above, a fluorescent material or a fluorescent element 16 capable of emitting three primary colors of light that is not emitted from a white backlight used in the past is used. By introducing it into the glass, it is possible to construct fluorescent glasses 2a to 2c that can independently emit the three primary colors of light. Therefore, when a non-light emitting device is used, a color display device can be configured without providing a color filter, and a color display device with high light utilization efficiency can be provided.

Furthermore, by introducing a fluorescent material or a fluorescent element into glass, particularly porous glass, the visible light conversion part is uniformly dispersed in the flat plate medium part itself that emits light in the backlight device, so there is no uneven brightness. If the light is emitted uniformly, the distance from the light emitted from the surface to the fluorescent glass 2a-2c is short, so the attenuation of light is reduced, and here again the light loss is reduced and the light utilization efficiency is improved. Can be made.

Further, for a liquid crystal display device having an optical shutter layer having a liquid crystal unit, the backlight device 1 according to the present embodiment emits light from the fluorescent glasses 2a to 2c, and drives the liquid crystal unit and emits light. Each of the three primary colors can be synchronized, and a color display device employing a field sequential method can be configured. Since this field sequential method is adopted, it is not necessary to divide one cell into three etc. and control it to 1/3 etc. for one pixel of the display unit. It is possible to provide a backlight device that can achieve a high resolution at the same time as making the resolution fine. Also, by forming the ultraviolet shielding film 17 on the surface of each fluorescent glass 2a to 2c, other ultraviolet rays can be provided. Color mixing without leaking into the fluorescent glass can be prevented. The density at which the fluorescent material or the fluorescent element 16 is introduced into the fluorescent glass can be easily adjusted, and the emission intensities of the fluorescent glasses 2a to 2c can be adjusted independently. Next, referring to FIG. 3 and FIG. 4, the backlight according to the preferred embodiment of the present invention, in which the fluorescent glasses 2a to 2c shown in FIG. A description will be added to another embodiment of the image processing apparatus.

Fig. 3 (a) is a conceptual diagram schematically showing the structure of the fluorescent glass used in the backlight device according to the present example, and (b) is a concept showing an enlarged portion indicated by symbol C in the figure. It is a figure. In Fig. 3 (a), in order to make the scattering distribution of the ultraviolet ray 43 transmitted through the fluorescent glass 2d uniform, the ultraviolet light source side end face 45 of the fluorescent glass 2d is changed to the ultraviolet light source opposite side end face 46. In comparison, one side of the fluorescent glass 2d is a slope 44. This slope 44 is preferably polished. The ultraviolet ray 43 radiated from the ultraviolet light source 28 enters from the ultraviolet light source side end face 45, and as shown in FIG. 3 (b), the ultraviolet incident light 39 is reflected on the inclined surface 44, and the ultraviolet light guide 29 It collides with the reflective particles 30, for example, titanium, to form ultraviolet scattered light 40, and when the ultraviolet scattered light 40 collides with the phosphor 27, visible light 42 is emitted. The ultraviolet reflective particles 30 are a concept including ultraviolet reflective nanoparticles.

Since the inclined surface 44 is formed from the ultraviolet light source side end face 45 to the ultraviolet light source reverse side end face 46, the ultraviolet light waveguide 29 gradually narrows, and the inclined surface 44 causes the ultraviolet light 43 (ultraviolet light incident light 39) to In a direction away from 28, that is, in a direction from the ultraviolet light source side end face 45 to the ultraviolet light source reverse side end face 46, it is reflected with a constant amount of light, and uniform ultraviolet scattered light 40 and visible light 42 can be obtained. Therefore, it is possible to provide the fluorescent glass 2d as a uniform surface light emitter.

The fluorescent glass 2d as shown in FIG. 3 (a) is produced as follows.

First, make a glass of 9Na 0-23B O _65SiO -3A10 with a thickness of about 1.5mm,

2 2 3 2 2 3

It becomes porous by acid treatment. Dope the phosphor solution (green: Tb ³⁺ , blue: Eu ²⁺ , red: Eu ³⁺ 0.3M) on one side of the glass with light and shade to offset the ultraviolet intensity of the UV light source 28 . In this case, doping is performed from the direction of the arrow indicated by the symbol A in the figure.

The shading can be applied by applying a phosphor solution by inkjet or by applying a mask pattern on glass with a photoresist or the like. Then, the glass is heated to 1120 ° C and densified. After that, polishing is performed so as to have an inclination as shown in Fig. 3 (a). It is also possible to form a slope by pouring into a mold in advance.

When ultraviolet light 43 is introduced from the ultraviolet light source side end face 45 by the ultraviolet light source 28, the ultraviolet light 43 is guided as shown in Fig. 3 (a), and the ultraviolet light guide 29 is coated with a pattern of ultraviolet reflective particles 30, for example, titania, and a titania solution is applied. As a result, the scattering power is increased and the luminance is improved. That is, titania 30 can be used as a scattering accelerator for ultraviolet rays 43. Since titania 30 needs to be doped on the side of the inclined surface 44 in the fluorescent glass 2d and scatter the ultraviolet rays 43 reflected by the inclined surface 44, the arrow indicated by the symbol B in the figure is used. Dope from the direction of the mark.

In this example, Tb ^{3+ is used} as the phosphor 27 that emits green, Eu ²⁺ is used as the phosphor 27 that emits blue, and Eu ³⁺ is used as the phosphor 27 that emits red. As shown, it is doped into an independent separate fluorescent glass 2d. Further, the fluorescent material 27 is not limited to those shown in the present embodiment, and other fluorescent materials and fluorescent elements may be used.

[0041] Next, an example of a mask pattern applied on the glass as a material when the fluorescent glass 2d is manufactured will be described with reference to FIGS. 4 (a) to (c). By using the mask pattern, it is possible to suppress the brightness unevenness and provide the fluorescent glass 2d as a uniform surface light emitter. Fig. 4 (a) is a conceptual diagram showing the irradiation distribution of ultraviolet rays when a spot-like ultraviolet light source 28 is used, and (b) shows this irradiation distribution in the case of the ultraviolet irradiation distribution shown in (a). FIG. 4 is a conceptual diagram showing a state in which a reverse mask pattern is formed, and FIG. 3C is a conceptual diagram schematically showing the impregnation concentration when the phosphor solution is impregnated at the time of the mask pattern shown in FIG. When a linear ultraviolet light source 28 such as a light emitting diode (LED) or a linear cathode light source such as a cold cathode fluorescent tube (CCFL) is used, the brightness near the ultraviolet light source 28 is improved and the distance from the light source increases. Luminance decreases in inverse proportion to the square.

For example, in FIG. 4 (a), as indicated by the symbol D, the vicinity of the ultraviolet light source 28 is irradiated with strong ultraviolet light. End up. In addition, the portion indicated by the symbol E forms a low luminance portion because the ultraviolet ray is weak in the middle of the ultraviolet light source 28. Furthermore, since the portion indicated by the symbol F is the farthest portion from the ultraviolet light source 28, it becomes the lowest luminance portion.

[0042] If the fluorescent glass 2d forms a luminance distribution as a light emitter in this way, it is unsuitable for use in an apparatus that requires a uniform light emitting surface such as a backlight. Therefore, when the phosphor is impregnated, the mask pattern opposite to the pattern shown in Fig. 4 (a) is used to impregnate the phosphor to promote uniform phosphor emission. It was. Specifically, for example, a mask pattern as shown in FIG. 4 (b) is previously formed on the surface of the glass and impregnated with phosphor. In the mask pattern shown in FIG. 4 (b), a mask pattern having a density opposite to the irradiation distribution of the ultraviolet light source 28 shown in FIG. 4 (a) is formed. ing. In Fig. 4 (b), impregnation of the phosphor is prevented in the black part. When such a mask pattern is used to impregnate the phosphor, it is possible to obtain a phosphor distribution with a lower concentration near the ultraviolet light source 28. Figure 4 (c) shows such a phosphor distribution. The darker the color, the higher the phosphor concentration. It can be seen that almost no phosphor is impregnated at the position D shown in Fig. 4 (a), and on the contrary, at the position indicated by the sign F, a considerable amount of the phosphor is impregnated. It is also possible to form the same effect by providing the mask pattern with a difference in density as shown in Fig. 4 (c).

It is needless to say that the distribution of the impregnation concentration of the phosphor is not necessary if the ultraviolet light source 28 can irradiate the ultraviolet rays uniformly as compared with the spot shape or the line shape. Introducing ultraviolet rays from a certain glass end face inevitably produces a contrast in luminance that is inversely proportional to the distance. Furthermore, in order to guide the ultraviolet light from the end to the opposite side, as described with reference to FIG. 3, by forming the slope 44 from the ultraviolet light source side end face 45 to the ultraviolet light source reverse side end face 46, the ultraviolet light source This is useful because the distribution of the scattering of ultraviolet rays 43 irradiated from 28 can be made uniform.

Next, a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 5 and FIG. FIG. 5 is a conceptual diagram showing the liquid crystal display device according to the present embodiment, and FIG. 6 is a conceptual diagram for explaining the control of light emission of the fluorescent glass and the drive of the liquid crystal. In FIG. 5, a liquid crystal display device 31 includes an optical shutter layer 22 sandwiched between a backlight device 1 and polarizing plates 21a and 21b, and driving thereof is performed by a backlight light emitting circuit unit 14 and a liquid crystal driving circuit unit 24, respectively. Yes. Further, in order to control the backlight light emitting circuit unit 14 and the liquid crystal driving circuit unit 24, a control unit 38 incorporating a synchronizing circuit unit 23 is provided. The backlight device 1 has already been described with reference to FIG. 1 and FIG. 2, but three independent fluorescent glasses 2a to 2c are provided, and light of red light, green light, and blue light 3 respectively. Emits primary colors. These fluorescent glasses 2a to 2c are connected to independent ultraviolet ray generators 3a to 3c, respectively, in which a voltage is applied to the carbon nanotubes to cause the electrons to collide with the ultraviolet phosphor to generate ultraviolet rays, thereby producing fluorescent glass. The fluorescent material or fluorescent element that generates visible light of each color introduced in 2a to 2c is absorbed. [0044] It is the backlight light emitting circuit unit 14 that supplies power to the ultraviolet ray generators 3a to 3c, and the drive of the backlight light emitting circuit unit 14 is also controlled by the control unit 38 including the synchronization circuit unit 23. is there. The backlight light emitting circuit unit 14 is controlled by the light emission control signal synchronized with the liquid crystal control signal by the synchronizing circuit unit 23.

The fluorescent glasses 2a to 2c are in the order of blue light, green light, and red light from the side closer to the optical shutter layer 22. However, the order is not limited to this order, and the order may be changed as appropriate. Les. Further, although gaps are formed between the respective fluorescent glasses, the gaps may be eliminated and adhered as described above.

[0045] The optical shutter layer 22 is sandwiched between two polarizing plates 21a and 21b arranged on the light incident side and the light emitting side. By combining these polarizing plates, the backlight device 1 Transmission is controlled by the polarization direction of the emitted light. Further, the two glass substrates 32a and 32b are configured so as to sandwich the wiring electrodes 37a and 37b, thereby preventing leakage from these electrodes. The liquid crystal part 34 is sealed so as not to leak by the sealing materials 35a and 35b, and is configured to be sandwiched between alignment films 33a and 33b for arranging the liquid crystal molecules 36 in a certain direction. These alignment films 33a and 33b are generally films made of polyimide resin, and have the role of aligning the direction of the liquid crystal molecules 36 in a state suitable for the operation mode, and are important for the liquid crystal section 34.

The glass substrates 32a and 32b are made of soda-free glass or ordinary glass whose surface is covered with a protective film to prevent the soda from flowing out, and the sealing materials 35a and 35b are made of UV or thermosetting epoxy resin. Used.

[0046] The wiring electrodes 37a and 37b are connected to the liquid crystal drive circuit unit 24, and the liquid crystal is driven by the liquid crystal control signal synchronized with the light emission control signal of the backlight device 1 by the synchronization circuit unit 23. Power is supplied by power cables 26a and 26b.

The liquid crystal drive method includes static drive, matrix drive, active drive, etc., and any drive method may be used. In particular, when displaying in color as in the liquid crystal display device according to the present embodiment, the liquid crystal An active drive method is suitable in which a thin film transistor (TFT) and an additional capacitor are connected to each pixel of the cell, and each pixel is controlled via these. The control unit 38 includes the synchronization circuit unit 23. However, the synchronization circuit unit 23 may be provided separately from the control unit 38 and connected thereto.

Next, a method for controlling the liquid crystal display device according to the present embodiment will be described with reference to FIG. In FIG. 6, (a) shows the state of emission control of the fluorescent glass 2a. The numbers shown with white circles indicate pixels.

In FIG. 6 (a), the fluorescent glasses 2b and 2c other than the fluorescent glass 2a are not emitting light. The light emitted from the fluorescent glass 2a is determined to be transmitted or not per pixel by the polarizing plates 21a and 21b and the optical shutter layer 22. As described above, the backlight light emitting circuit unit 14 for driving the fluorescent glass 2c and the liquid crystal driving circuit unit 24 for driving the optical shutter layer 22 are controlled by the light emission control signal and the liquid crystal control signal, respectively. Are synchronized by the synchronization circuit 23. Therefore, it is possible to control transmission of light emitted from the fluorescent glass for each of a large number of pixels constituting the liquid crystal display device by using these control signals.

For example, in FIG. 6 (a), control is performed so that the red light 41a is transmitted through the pixels 1, 2, 4, and 8. The optical shutter layer 22 is driven in synchronization with the red light emitted by the fluorescent glass 2a. The duration of this state is about 3 to 5 ms.

Thereafter, as shown in FIG. 6B, the fluorescent glass 2b emits light, and green light 41b is emitted through the polarizing plates 21a and 21b and the optical shutter layer 22. The green light 41b emitted from the fluorescent glass 2b is controlled and emitted so that only the pixels 1, 3, 4, 6, and 8 are transmitted by the optical shutter layer 22 driven in synchronization. This state also takes about 3 to 5 ms.

Finally, as shown in FIG. 6 (c), the fluorescent glass 2c emits light, and blue light 41c is emitted through the polarizing plates 21a and 21b and the optical shutter layer 22. The light emission of the fluorescent glass 2b is controlled by the backlight light emitting circuit unit 14, but the light emission control signal is synchronized with the liquid crystal control signal that drives the optical shutter layer 22, and only the pixels 1, 2, 3, and 7 are used. The light is transmitted through the light shirter layer 22 and released. This is also about 3 to 5 ms.

[0049] Since each color light emitted from the backlight device 1 composed of these three independent fluorescent glasses 2a to 2c is controlled for each pixel of the liquid crystal display device with a slight time difference, As shown in Fig. 6 (d), red light 41a, green light 41b, and blue light 4 lc are emitted to the retina between them, and they appear as mixed afterimages, which can be perceived as various colors. It is. For example, in pixel 1, all three primary colors of light are emitted and transmitted, so it looks white, in pixel 2, only red light and blue light appear mixed and appear pink, and in pixel 3, green light Only blue light appears mixed and appears light blue, and in pixel 5, all three primary colors of light are opaque and appear black.

[0050] Although it is clear when FIG. 6 is compared with FIG. 7 when the background art is described, in the liquid crystal display device according to the present embodiment, although color development can be controlled for each pixel, FIG. In the case of the conventional technology shown, the pixel can be controlled only for each fine cell divided into three parts. Therefore, when considered at the pixel level, the liquid crystal display device according to this embodiment has higher definition and higher control. It is possible to demonstrate trust. In other words, while the conventional technology spatially controls the three primary colors, in this embodiment, in order to control temporally, it is possible to express a precise image or video with high resolution and contrast. It became possible.

Further, since the fluorescent glasses 2a to 2c are employed without using a color filter, high light utilization efficiency can be realized with little light loss. Furthermore, as described above, by introducing a fluorescent material or a fluorescent element into the porous glass in particular, the visible light conversion unit is uniformly dispersed in the flat plate medium unit that emits light in the backlight device. Light is emitted uniformly so that there is no unevenness, and since the distance from emission to emission from the surface of the fluorescent glass 2a to 2c is short, the attenuation of light is reduced, and the power loss can be reduced here. Industrial applicability

[0051] As described above, the invention described in claims 1 to 9 of the present invention includes liquid crystal televisions and monitor devices, mobile phones, digital cameras, digital audio players, telephones, It can be used in various liquid crystal display devices such as facsimiles.

Claims

The scope of the claims

[1] An ultraviolet ray generator (3), a visible light converter (16) that converts ultraviolet rays emitted by the ultraviolet ray generator (3) into visible light (41a, 41b, 41c), and the visible light converter A backlight device (1) having a transparent flat plate medium portion (2a, 2b, 2c) for propagating visible light (41a, 41b, 41c) emitted by (16), The converter (16) is provided with three independent systems, converting ultraviolet light into red light (41a), green light (41b), and blue light (41c), respectively, and the flat plate media part (2a, 2b, 2c) The backlight device (1), wherein the backlight device (1) is provided with three layers of gaps or without any gaps corresponding to the visible light conversion units (16) provided independently of three systems. .

[2] A thin film (17) that transmits visible light (41a, 41b, 41c) and blocks ultraviolet rays is formed on the surface of each of the three flat media sections (2a, 2b, 2c) provided independently. The backlight device (1) according to claim 1, wherein the backlight device (1) is provided.

[3] The ultraviolet ray generator (3) has an electron emission source as a force sword electrode (7), an ultraviolet phosphor (5) as an anode electrode, and an electron extraction grid is provided to extract and accelerate the ultraviolet rays. The backlight device (1) according to claim 1 or claim 2, wherein the backlight device (1) is made to collide with the phosphor (5) to generate ultraviolet rays.

[4] The flat plate media portions (2a, 2b, 2c) are independent three-layer glass, and the visible light conversion portions (16) provided in three independent systems are introduced into the glass. The fluorescent material or the fluorescent element (16) generating red light (41a), green light (41b), and blue light (41c), respectively. Backlight device (1).

[5] The fluorescent material or the fluorescent element (16) is doped so as to have a fluorescence intensity distribution opposite to the distribution of the ultraviolet ray intensity irradiated from the ultraviolet ray generator (3). Claim range 1 to claim 4. The backlight device (1) according to claim 1.

[6] Either one of the flat surfaces of the flat plate medium portion (2d) forms a slope (44), and as the distance from the vicinity of the ultraviolet ray generating portion (28) increases, The backlight device (1) according to any one of claims 1 to 5, wherein the cross-sectional area formed is formed to be narrow.

[7] In the vicinity of the slope (44) formed on one plane of the flat plate medium portion (2d), ultraviolet rays (43) The backlight device (1) according to claim 6, wherein the particles (30) reflecting the light are doped.

[8] The liquid crystal unit (34) constituting the display device is synchronized with a control signal for driving the red light (41a), the green light (41b), and the blue light (41c) to transmit each color light with a time difference. The ultraviolet light generating unit receives the control signal and generates the red light (41a), the green light (41b), and the blue light (41c), respectively, by the three independent visible light conversion units. The backlight device (1) according to any one of claims 1 to 7, further comprising a backlight light emitting circuit unit (14) for driving (3).

[9] The backlight device (1) according to claim 8, a liquid crystal unit (34), an optical shutter layer (22) including an electrode for applying a voltage to the liquid crystal unit (34), A liquid crystal driving circuit section (24) for generating a voltage applied to the liquid crystal section (34) and a synchronizing circuit section (23) are provided for each of the red light (41a), green light (41b), and blue light (41c). A control unit (38) for transmitting a control signal synchronized with the liquid crystal drive circuit unit (24) and the backlight light emitting circuit unit (14) to transmit the light through the optical shutter layer (22) and emit the backlight, respectively. A liquid crystal display device (31) characterized by comprising: