JP2004070189A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the number of parts and the number of assembling processes to reduce the cost. <P>SOLUTION: The liquid crystal display is composed of a main liquid crystal display element 1 having a display screen to display main information in the outer face side, a light guide body 3 made of a light transmitting resin material disposed in the back side of the main element with a polarizing sheet 2 interposed, a reflective sheet 4 having an open window 4a formed in the center disposed in the back side of the light guide body 3, a polarizing sheet 5 disposed in the back side of the reflective sheet 4, and further, a sub liquid crystal display element 6 having a display screen to display sub information is disposed in the back side of the polarizing sheet 5. Thereby, part of the light L introduced into the light guide body 3 is made to transmit through a reflective pattern 3a in the reflecting face side of the body 3, and the transmitted light L2 is made to pass through the window 4a formed in the reflective sheet 4 to expand into planar light by the combination of the polarizing sheet 5 to irradiate the back face of the sub liquid crystal display element 6. Thus, both of the main liquid crystal display element 1 and the sub liquid crystal display apparatus 6 can be made to screen-display by using only one backlight apparatus. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a backlight device in which a main liquid crystal display element and a sub liquid crystal display element are incorporated in the same housing and light source light is introduced into both liquid crystal display elements. is there.
[0002]
[Prior art]
2. Description of the Related Art In recent years, small portable terminal devices such as portable telephones and portable information terminals generally employ a power-saving, compact and lightweight liquid crystal display device as a display device. This type of liquid crystal display device has a structure using external light as illumination means for visualizing an electronic latent image formed on the liquid crystal display element, and a structure in which an auxiliary illumination device is installed on the front side or the back side of the liquid crystal display element. Is used. The auxiliary lighting device installed on the back side of the liquid crystal display device is called a backlight device, and the auxiliary lighting device installed on the front side of the liquid crystal display device is called a front light device.
[0003]
As a light source for an auxiliary lighting device of such a small portable terminal device, there is a light guide in which a cold cathode fluorescent lamp is disposed on a side wall (side edge) side, such as a notebook personal computer having a relatively large display screen size. Although there is a structure, there are many solid-state light-emitting devices typified by light-emitting diodes (LEDs) with low power consumption instead of the cold-cathode fluorescent lamps in mobile phones and small portable information terminal devices (so-called PDA). Used.
[0004]
FIG. 7 is a perspective view schematically illustrating the entire configuration of a liquid crystal display device having a backlight device using light emitting diodes as light emitting elements as light guides. This backlight device is installed on the back side of the liquid crystal display element. In FIG. 7, two prism sheets PRS and a diffusion sheet LDS are sequentially stacked and arranged on the back surface of the liquid crystal display element PNL, and a mold case MLD containing a light guide GLB is provided on the back surface of the diffusion sheet LDS. Are located. On the back side of the light guide GLB, a printed circuit board PCB on which the above-described light emitting diode LED and electronic components (not shown) are mounted.
[0005]
The printed circuit board PCB on which the liquid crystal display element PNL, the prism sheet PRS, the diffusion sheet LDS, the light guide GLB, the light emitting diode LED, and the like are mounted is not shown, but is held in a housing and integrally formed with the liquid crystal display device. Be composed. An area indicated by a dotted line in the liquid crystal display element PNL indicates a display area AR, and substantially coincides with an illumination area of the light guide GLB.
[0006]
In such a configuration, in this type of backlight device, a light-emitting diode LED is disposed with its light-emitting portion facing a side edge which is a side wall of a light guide GLB provided on the back side of the liquid crystal display element PNL. The light emitted from the light emitting portion of the light emitting diode LED is introduced into the light guide GLB with the side edge as a light incident surface.
[0007]
Although not shown, the light guide GLB is formed with a light diffusion pattern having a plurality of concave or convex grooves on the light reflecting surface side or both side surfaces thereof, and was introduced into the light guide GLB. The light is diffusely reflected and diffused by the light diffusion pattern, and illuminates the back surface of the liquid crystal display element PNL to obtain a uniformly bright display screen.
[0008]
Japanese Patent Application Laid-Open No. 2002-8423 discloses a related art related to a backlight device that irradiates a liquid crystal display element from the back in a transmission type liquid crystal display device or the like. No technique relating to a liquid crystal display device in which a liquid crystal display element and a set of backlight devices are integrally accommodated is disclosed.
[0009]
[Problems to be solved by the invention]
In recent years, foldable mobile phone devices have become mainstream, and recently, in addition to the screen display of the main liquid crystal display element provided on the housing side, a sub liquid crystal display element is mounted on the back side, and this sub Simple information such as date and time, time display, clock display, and presence / absence of an incoming call can be displayed on a liquid crystal display element.
[0010]
However, in this folding system, two sets of a liquid crystal display element, a light guide, a light emitting diode, and the like having the configuration described above with reference to FIG. 7 are incorporated in a housing, and a main liquid crystal display element and a sub liquid crystal display element are provided. , And has a structure in which the back sides are combined with each other.
[0011]
However, the liquid crystal display device thus configured is configured using two sets of backlight devices, one for the main liquid crystal display device and one for the sub liquid crystal display device. As a result, the number of components increases approximately twice as the number of backlight devices increases, so that the manufacturing cost increases due to the increase in the number of components and the number of assembling steps, and thus the product cost becomes high. There was a problem.
[0012]
In addition, as the number of sub-liquid crystal display elements increases, the power consumption increases as the number of components increases, which makes it difficult to reduce power consumption.
[0013]
Also, as the number of components increases, the area occupied in the housing increases, which increases the physical space, and in turn, increases the volume of the housing. In addition, there is a problem that the demand for slimness is reversed, and it is difficult to reduce the size and weight.
[0014]
Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display device capable of reducing the number of parts and the number of assembling steps and realizing low cost. It is in.
[0015]
Another object of the present invention is to provide a liquid crystal display device that can reduce the number of components, and can realize miniaturization and low power consumption.
[0016]
Still another object of the present invention is to provide a liquid crystal display device capable of efficiently reflecting and diffusing light introduced into a light emitting element to obtain a uniformly bright display screen on the liquid crystal display element. .
[0017]
[Means for Solving the Problems]
In order to achieve such an object, the liquid crystal display device according to the present invention comprises a first liquid crystal display element and a second liquid crystal which is provided on the first liquid crystal display element and spaced apart from each other with their back surfaces facing each other. A display element, and a light emitting surface that is installed to face between the back surfaces of the first liquid crystal display element and the second liquid crystal display element and that emits the introduced light, facing the first liquid crystal display element. A light guide having a light reflection surface formed on a back surface facing the light emission surface and having a light reflection pattern formed of a plurality of grooves having a substantially V-shaped cross section for reflecting the introduced light with respect to the light emission surface; A light-emitting element that is installed on a side wall of the light guide and irradiates light into the light guide, and is installed facing the light-emitting surface of the light guide and the first liquid crystal display element; A first deflecting sheet for developing and emitting outgoing light in a planar manner on the back surface of the first liquid crystal display element; A reflection sheet, which is installed to face the light reflecting surface of the light guide and has an opening window in a part thereof, and is installed between the reflection sheet and the second liquid crystal display element so as to face each other; By providing a second deflecting sheet that spreads the light that has passed through the opening window of the sheet and emits the light, the first liquid crystal display element and the second liquid crystal display element form one backlight device. Can be shared.
[0018]
Further, the liquid crystal display device according to the present invention is characterized in that the light diffusion surface is formed by a groove having a substantially V-shaped cross section with a large depth in the thickness direction of the light guide on a surface of the light guide opposite to the opening window of the light reflection surface. By forming the pattern, the amount of diffusion of the light introduced into the first liquid crystal display element and the second liquid crystal display element becomes substantially uniform.
[0019]
In another liquid crystal display device according to the present invention, a light diffusion pattern comprising a plurality of grooves having a substantially V-shaped cross section is provided on the light emitting surface of the light guide along the same direction as the traveling direction of the principal ray of the light emitting element. Thus, the amount of diffusion of the introduced light applied to the first liquid crystal display element increases.
[0020]
Still another liquid crystal display device according to the present invention includes a first liquid crystal display element, and a second liquid crystal display element which is spaced apart from the first liquid crystal display element and arranged with their back surfaces facing each other. A first liquid crystal display element and a second liquid crystal display element. The first liquid crystal display element and the second liquid crystal display element are provided so as to face each other and have a light emission surface for emitting the introduced light, and are formed on the back surface opposite to the light emission surface. And a light guide having a light reflection surface on which a light reflection pattern formed of a plurality of grooves having a substantially V-shaped cross section for reflecting the introduced light with respect to the light emission surface, and installed on a side wall of the light guide, And a light emitting element that irradiates light into the light guide, a light reflecting tape attached to the outer surface of the substantially U-shaped section of the light guide, and a light reflecting surface of the light guide are installed facing the light reflecting surface, And at least one light reflector for reflecting the introduced light to the light emitting surface; and a first liquid crystal display element. At least one first optical sheet disposed opposite to the back of the first optical sheet, a first light diffusion sheet disposed opposite to the back of the first optical sheet, and a rear surface of the second liquid crystal display element The first liquid crystal display element by providing at least one second optical sheet provided to face the second optical sheet and a second light diffusion sheet provided to face the back surface of the second optical sheet. One backlight device can be shared by the and the second liquid crystal display element.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0022]
FIG. 1 is a view for explaining an embodiment of a liquid crystal display device according to the present invention. FIG. 1 (a) is a sectional view, and FIG. 1 (b) is a view from the reflection sheet side of FIG. 1 (a). FIG. In addition, a printed board on which electronic components and the like are mounted and a mold case and the like as a housing are interposed at required portions between the respective components, but these are not illustrated for easy understanding. .
[0023]
In FIG. 1A, a light guide 3 made of a translucent resin material is disposed via a deflecting sheet 2 on the back side of a main liquid crystal display element 1 having a display surface for displaying main information on a screen on the outer side. On the back side of the light guide 3, there is disposed a reflection sheet 4 having a rectangular opening window 4a formed in a central portion, and on the back side of the reflection sheet 4, a deflection sheet 5 is disposed. . On the back side of the deflecting sheet 5, a sub liquid crystal display element 6 having a display surface on the outer surface side for displaying simple auxiliary information such as date and time, time display, clock display, and presence or absence of an incoming call on the screen is arranged. .
[0024]
On the side wall (side edge) of the light guide 3, as shown in FIG. 1B, three light emitting diodes 7 serving as light emitting elements are arranged so that their light emitting portions face the light incident surface of the light guide 3. Are mounted on a printed circuit board (not shown). Reference numeral 4a denotes an opening window 4a of the reflection sheet 4 shown in FIG. 1A, and no reflection sheet is formed in the opening window 4a, and the light reflection surface side of the light guide 3 is It has an exposed structure.
[0025]
2A and 2B are diagrams for explaining the configuration of the light guide 3 described above in detail. FIG. 2A is a plan view, and FIG. 2B is a view along the line AA ′ in FIG. FIG. 2C is a cross-sectional view taken along line BB ′ of FIG. 2A, and FIG. 2D is a cross-sectional view taken along line CC ′ of FIG. 2A. FIG. 2E is a sectional view taken along line DD ′ of FIG. 2A. In FIG. 2, the light exit surface of the light guide 3 facing the deflection sheet 2 has a substantially flat surface. The light reflecting surface of the light guide 3 facing the reflection sheet 4 has a plurality of grooves having a substantially V-shaped cross section as shown in FIGS. 2B and 2E on its main surface. The formed light reflection pattern 3a is formed.
[0026]
Also, the surface of the light guide 3 facing the opening window 4a of the reflection sheet 4 has a more light guiding pattern than the light reflection pattern 3a formed on the main surface as shown in FIGS. 2 (c) and 2 (d). A light reflection pattern 3b having a large depth is formed in the thickness direction of the light body 3. In this case, the groove distribution of the light reflection pattern 3b is formed with a higher density distribution than the groove distribution of the light reflection pattern 3a on the main surface.
[0027]
The light guide 3 has a deflecting sheet 2 on its upper surface and a reflecting sheet 4 and an deflecting sheet 5 each having an opening 4a formed on its lower surface. Are brought into close contact with each other and combined, and integrated to form a backlight device.
[0028]
In such a configuration, part of the light L introduced into the light guide 3 by the light emission of each light emitting diode 7 as shown in the main part enlarged sectional view of FIG. The light is reflected by the inclined surface of the substantially V-shaped groove of the light reflection pattern 3a formed on the surface, and is reflected as reflected light L1 toward the deflection sheet 2 on the main liquid crystal display element side (not shown).
[0029]
The other part of the light L introduced into the light guide 3 is also transmitted through the inclined surface of the substantially V-shaped groove and transmitted outside the light guide 3 as transmitted light L2. As shown in the sectional view of FIG. 3B, the light is reflected by the reflection sheet 4 disposed on the opposing surface, re-introduced into the light guide 3, and is reflected toward the deflection sheet 2 on the main liquid crystal display element side. Then, the light is emitted to the entire back surface of the main liquid crystal display element 1 as emitted light L3. Therefore, a display screen with high luminance can be obtained on the main liquid crystal display element 1.
[0030]
In addition, a part of the transmitted light L2 transmitted to the outside of the light guide 3 passes through the opening window 4a of the reflection sheet 4 and is introduced into the deflecting sheet 5, where it is developed into a planar shape and emitted as the output light L4. The entire back surface of the element 6 is irradiated. Here, as shown in FIGS. 2 (c) and 2 (d), the light reflecting surface of the light guide 3 facing the opening window 4a of the reflecting sheet 4 is smaller than the light reflecting pattern 3a on the main surface. Since the light reflection pattern 3b is formed at a high density, the light is emitted to the back surface of the sub liquid crystal display element 6 as outgoing light L4 having high light reflection and diffusion. Therefore, a display screen having a high luminance substantially equal to that of the main liquid crystal display element 1 can be obtained for the sub liquid crystal display element 6.
[0031]
According to such a configuration, a part of the light L introduced into the light guide 3 is transmitted through the light reflection pattern 3 a on the light reflection surface side, and the transmitted light L 2 is formed on the reflection sheet 4. 4a, the deflection sheet 5 can be combined and developed in a plane to irradiate the back surface of the sub liquid crystal display element 6. Therefore, only the backlight device composed of one light guide 3 is used. Both the main liquid crystal display element 1 and the sub liquid crystal display device 6 can be simultaneously displayed on the screen. Therefore, since one light guide 3 can be used for both the back surfaces of the main liquid crystal display element 1 and the sub liquid crystal display element 6, the number of components such as light emitting diodes and light guides can be reduced by half. it can.
[0032]
In the above-described embodiment, the case has been described in which the reflective sheet 4 has one rectangular opening window 4a in the central portion thereof along the length direction, but the present invention is not limited to this. Instead, as shown in plan views in FIGS. 4 (a) and 4 (b), various sizes and shapes and a plurality of opening windows 4b, 4c, 4d may be provided as necessary. As a result, the number of display screens of the sub liquid crystal display element can be increased, so that various amounts of auxiliary information can be displayed on the screen and divided display can be performed.
[0033]
Further, in the above-described embodiment, the case where the surface shape of the light exit surface of the light guide 3 facing the deflection sheet 2 is formed as a flat surface, but the present invention is not limited to this. As shown in a perspective view in FIG. 5, on the main surface of the light emitting surface of the light guide 3 opposed to the deflecting sheet 2, at a uniform pitch along the traveling direction of the main light beams emitted from the respective light emitting diodes 7. By forming the light diffusion pattern 3c having a plurality of grooves having a substantially V-shaped cross section with depth, light introduced into the light guide 3 from each light emitting diode 7 is reduced by the inclined surface of the substantially V-shaped groove. Since the light is diffused almost entirely toward the deflecting sheet 2 and is spread and irradiated on the back surface of the main liquid crystal display element 1 by the deflecting sheet 2, the brightness of the display screen can be greatly improved.
[0034]
In the above-described embodiment, the case where the light reflection patterns 3a and 3b in which a plurality of grooves each having a substantially V-shaped cross section are formed on the light exit surface and the light reflection surface of the light guide 3 has been described. The present invention is not limited to these pattern shapes, and the same operational effects can be obtained as described above by using a substantially trapezoidal cross-section, a substantially wedge-shaped cross-section, a dot shape, or a pattern formed by combining these various shapes. Needless to say.
[0035]
6A and 6B are views for explaining a configuration of another embodiment of the liquid crystal display device according to the present invention. FIG. 6A is a cross-sectional view showing the entire configuration, and FIG. FIG. 2 shows an enlarged cross-sectional view of a portion A. In addition, a printed board on which electronic components and the like are mounted and a mold case and the like as a housing are interposed at required portions between the respective components, but these are not illustrated for easy understanding. . In addition, the same reference numerals are given to the same portions as those in the above-described drawings, and the description thereof is omitted.
[0036]
In FIG. 6A, the back side of a main liquid crystal display element 1 having a display surface for displaying main information on the outer side and a sub liquid crystal display element 2 having a display surface for displaying auxiliary information on the outer side are provided. A plurality of grooves formed of a translucent resin material and having a substantially U-shaped cross section and having a substantially V-shaped cross section as shown in FIG. The light guide 11 having the light reflection pattern 11a on which is formed is arranged to face each other.
[0037]
Between the light guide 11 and the main liquid crystal display element 1, two prism lens sheets 12, 13 and a light diffusion sheet 14 are sequentially laminated and interposed. Similarly, between the light guide 11 and the sub liquid crystal display element 6, two prism lens sheets 15, 16 and a light diffusion sheet 17 having the same configuration are sequentially laminated and interposed. Further, two reflection sheets 18 and 19 are disposed on the U-shaped inner wall surface of the light guide 11. On the outer surface of the U-shaped section of the light guide 11, a reflective tape 20 for preventing leakage of the light introduced into the outside is adhered.
[0038]
In such a configuration, the light L introduced into the light guide 11 by the light emission of the light emitting diode 7 as shown in FIG. 6 (a) is partially reflected on the light reflecting surface as shown in FIG. 6 (b). The light is reflected by the inclined surface of the substantially V-shaped groove in the cross section of the light reflection pattern 11a formed on the main surface of the light reflection sheet 18 and the reflection sheet 18, introduced into the light diffusion sheet 14 as reflected light L5, and diffused by the light diffusion sheet 14. The light is developed into a planar shape by the two prism lens sheets 13 and 12 and is irradiated on the back surface of the main liquid crystal display element 1.
[0039]
The other part of the light L introduced into the light guide 3 passes through the inside of the light guide 11, and the substantially U-shaped section is prevented from leaking light by the reflection tape 20, and the outline arrow B is used. 6B, the light is reflected by the inclined surface of the groove of the light reflection pattern 11a formed on the light reflection surface and the light reflection sheet 19 as shown in FIG. Then, the light is diffused by the light diffusion sheet 17, developed into a planar shape by the two prism lens sheets 16 and 15, and illuminated on the back surface of the sub liquid crystal display element 6. Therefore, a display screen having a high luminance substantially equal to that of the main liquid crystal display element 1 can be obtained for the sub liquid crystal display element 6. In addition, the screen dimensions of the main liquid crystal display element 1 and the sub liquid crystal display element 6 can be set to the same dimensions, and a display screen having substantially the same brightness can be obtained for both the liquid crystal display elements 1 and 6.
[0040]
According to such a configuration, the light L introduced into the light guide 11 having a substantially U-shaped cross section is reflected by the light reflection pattern 11a in the direction of the light emission surface, and the diffusion sheet 14 and the prism lens sheet, respectively. 13, 12 and the diffusion sheet 17 and the prism lens sheets 16 and 15 are spread in a plane and can be irradiated on the back surfaces of the main liquid crystal display element 1 and the sub liquid crystal display element 6, respectively. Is used, a bright display screen having a uniform luminance distribution for both the main liquid crystal display element 1 and the sub liquid crystal display device 6 can be obtained. Therefore, since the light guide 11 is formed in a substantially U-shaped cross section, it can be used on both the back surfaces of the main liquid crystal display element 1 and the sub liquid crystal display element 6, so that both display screen dimensions are the same. In addition to setting, the number of components such as the light emitting diode and the light guide can be halved.
[0041]
Although the present invention has been described with reference to a transflective liquid crystal display device as a liquid crystal display device, the present invention is not limited to this, and is applicable to a total transmission liquid crystal display device, a reflective liquid crystal display device, and the like. As a matter of course, the same effect as described above can be obtained.
[0042]
【The invention's effect】
As described above, according to the liquid crystal display device of the present invention, the light emission for emitting the introduced light between the back surfaces of the first liquid crystal display element and the second liquid crystal display element in opposition to the first liquid crystal display element. A light guide having a light-reflecting surface on which a light-reflecting pattern comprising a plurality of grooves having a substantially V-shaped cross section for reflecting the introduced light is provided on a back surface facing the light-emitting surface; By providing a reflection sheet having an opening window in opposition to the reflection surface, it is possible to irradiate the light introduced into the light guide to the back surface of the sub liquid crystal display element, so that only one light guide is required. By using this, both the main liquid crystal display element and the sub liquid crystal display device can be irradiated with the introduced light, and the number of components such as a light emitting element and a light guide conventionally used can be greatly reduced. In addition, by reducing the number of parts, the number of assembling steps can be greatly reduced, and assembling workability can be improved. As a result, cost reduction, low power consumption, and small size and light weight can be achieved. Is obtained.
[0043]
According to another liquid crystal display device of the present invention, light having a substantially V-shaped cross section with a large depth in the thickness direction is formed on the light reflecting surface of the light guide opposed to the opening window of the reflection sheet. By providing the reflection pattern, the sub liquid crystal display element is radiated to the sub liquid crystal display element as outgoing light having a high light reflection and diffusion degree. It has an extremely excellent effect of being obtained.
[0044]
According to still another liquid crystal display device of the present invention, a plurality of grooves each having a substantially V-shaped cross section are formed on the light emitting surface of the light guide along the same direction as the traveling direction of the principal ray of the light emitting element. By providing the diffusion pattern, the amount of diffusion of the introduced light to the first liquid crystal display element is increased, so that an extremely excellent effect of obtaining a uniformly bright display screen without uneven brightness is obtained.
[0045]
According to another liquid crystal display device according to the present invention, the liquid crystal display device has a light exit surface for emitting guided light between the first liquid crystal display device and the second liquid crystal display device facing the back surface. A light guide having a substantially U-shaped cross section having a light reflection surface on which a light reflection pattern formed of a plurality of grooves having a substantially V-shaped cross section for reflecting the introduced light with respect to the light emission surface is provided on the opposed back surface. This makes it possible to set the screen dimensions of the first liquid crystal display element and the second liquid crystal display element to the same dimensions, and to reduce the light introduced from the side of the light guide to the main liquid crystal display element and the sub liquid crystal display element. Since it is possible to irradiate both of the liquid crystal display elements, a bright display screen with uniform luminance distribution and the same screen size can be obtained. Furthermore, the number of components, such as a light emitting element and a light guide, which have been conventionally used can be significantly reduced. In addition, by reducing the number of parts, the number of assembling steps can be greatly reduced, and assembling workability can be improved. As a result, cost reduction, low power consumption, and small size and light weight can be achieved. Is obtained.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a main part of a liquid crystal display device according to an embodiment of the present invention, excluding a printed board and a mold case as a housing.
FIG. 2 is a cross-sectional view illustrating a configuration of the light guide shown in FIG.
FIG. 3 is a cross-sectional view illustrating an operation of the liquid crystal display device shown in FIG.
FIG. 4 is a plan view illustrating another embodiment of the reflection sheet shown in FIG.
FIG. 5 is a perspective view illustrating another embodiment of the light guide shown in FIG.
FIG. 6 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to another embodiment of the present invention.
FIG. 7 is an exploded perspective view illustrating a configuration of a liquid crystal display device having a backlight device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main liquid crystal display element 2 Deflection sheet 3 Light guide 3a Light reflection pattern 3b Light reflection pattern 3c Light diffusion pattern 4 Reflection sheet 4a Open window 4b Open window 4c Open window 4d Open window 5 Deflection sheet 6 Sub liquid crystal display element 7 Light emitting diode Reference Signs List 11 light guide 11a light reflection pattern 12 prism lens sheet 13 prism lens sheet 14 light diffusion sheet 15 prism lens sheet 16 prism lens sheet 17 light diffusion sheet 18 reflection sheet 19 reflection sheet 20 reflection tape

Claims (4)

A first liquid crystal display element;
A second liquid crystal display element, which is installed at a distance from the first liquid crystal display element and opposite to each other, and
A light-emitting surface that is installed to face between the back surfaces of the first liquid crystal display element and the second liquid crystal display element and that emits guided light in opposition to the first liquid crystal display element; A light guide having a light reflection surface formed on a back surface facing the light emission surface and having a light reflection pattern formed of a plurality of grooves having a substantially V-shaped cross section for reflecting the introduced light with respect to the light emission surface. When,
A light emitting element installed on a side wall of the light guide and irradiating light to the light guide,
A light emitting device is disposed between the light exit surface of the light guide and the first liquid crystal display element so as to be opposed to the first liquid crystal display element. 1 deflection sheet,
A reflection sheet which is provided so as to face the light reflection surface of the light guide, and has an opening window formed at least in part,
A second deflecting sheet that is disposed between the reflective sheet and the second liquid crystal display element so as to face each other, and that develops and emits light that has passed through an opening window of the reflective sheet in a planar shape;
A liquid crystal display device comprising: The light guide has a light reflection pattern including a groove having a substantially V-shaped cross section with a large groove depth in a thickness direction of the light guide on a surface of the light reflection surface facing the opening window. The liquid crystal display device according to claim 1, wherein: The light guide has a light diffusion pattern in which a plurality of grooves having a substantially V-shaped cross section are formed on the light emitting surface along the same direction as the traveling direction of the principal ray of the light emitting element. The liquid crystal display device according to claim 1. A first liquid crystal display element;
A second liquid crystal display element, which is installed at a distance from the first liquid crystal display element and opposite to each other, and
A light emitting surface is provided to face the back surface of the first liquid crystal display element and the second liquid crystal display device, and has a light emitting surface for emitting the introduced light, and is formed on the back surface facing the light emitting surface. And a light guide having a light reflection surface on which a light reflection pattern formed of a plurality of grooves having a substantially V-shaped cross section for reflecting the introduced light with respect to the light emission surface,
A light emitting element installed on a side wall of the light guide and irradiating light to the light guide,
A light reflecting tape attached to an outer surface of the substantially U-shaped section of the light guide,
At least one light reflector that is installed to face the light reflection surface of the light guide, and reflects the introduced light to the light emission surface;
At least one first optical sheet disposed opposite to the back surface of the first liquid crystal display element;
A first light diffusing sheet disposed opposite to a back surface of the first optical sheet;
At least one second optical sheet provided so as to face the rear surface of the second liquid crystal display element;
And a second light diffusing sheet disposed opposite to the back surface of the second optical sheet.

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