JP2003140126A - Liquid crystal display device - Google Patents

Liquid crystal display device

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Publication number
JP2003140126A
JP2003140126A JP2001333721A JP2001333721A JP2003140126A JP 2003140126 A JP2003140126 A JP 2003140126A JP 2001333721 A JP2001333721 A JP 2001333721A JP 2001333721 A JP2001333721 A JP 2001333721A JP 2003140126 A JP2003140126 A JP 2003140126A
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JP
Japan
Prior art keywords
liquid crystal
crystal display
display panel
prism
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001333721A
Other languages
Japanese (ja)
Inventor
Akira Kobayashi
Toshikazu Miyauchi
Masumi Sasuga
敏和 宮内
晃 小林
眞澄 流石
Original Assignee
Hitachi Ltd
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, 株式会社日立製作所 filed Critical Hitachi Ltd
Priority to JP2001333721A priority Critical patent/JP2003140126A/en
Publication of JP2003140126A publication Critical patent/JP2003140126A/en
Application status is Pending legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which is improved in the luminance of a display screen of a liquid crystal display panel than heretofore. SOLUTION: The liquid crystal display device is furnished with the liquid crystal display panel having liquid crystals held between a pair of substrates and a back light arranged on the side opposite to the display surface of the liquid crystal display panel, in which the back light has a light source for irradiating irradiation light to the liquid crystal display panel and first and second optical elements for condensing the irradiation light from the light source. The first optical element has a multiplicity of first prism elements formed at specified intervals on a first main surface and the second optical element has a plurality of second prism elements which are formed at random intervals on the first main surface and intersect with the ridge line direction of the first prism elements. The second prism elements have the zigzag ridge lines and are so arranged that the ridge line direction parallels to the extension direction of the light source.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly to a technique effective for improving the brightness of a liquid crystal display panel. 2. Description of the Related Art Liquid crystal display modules of the STN (Super Twisted Nematic) type or the TFT (Thin Film Transister) are widely used as display devices for notebook personal computers and the like. These liquid crystal display modules are composed of a liquid crystal display panel around which a drive circuit is arranged, and a backlight unit that irradiates the liquid crystal display panel. This backlight unit, for example, in the mold, light emitted from a light source,
A light guide for guiding the light source away from the light source and uniformly irradiating the entire liquid crystal display panel with light; and a light guide near the side of the light guide, and arranged along the side of the light guide and parallel to the side. A cold cathode fluorescent lamp as a linear light source, an optical sheet (for example, two diffusion sheets and two prism sheets) disposed on the light guide, and extended and disposed below the light guide. And a reflection sheet. Such a technique is described in, for example, JP-A-63-309921, “12.5-type active matrix color liquid crystal display employing a redundant configuration”, Nikkei Electronics, page 19
3-210, published December 15, 1986 by Nikkei McGraw-Hill. [0003] As described above, the optical sheet of the backlight is composed of two prisms each including a first prism sheet and a second prism sheet disposed on a light guide. With sheet. The first and second prism sheets have a top surface (a surface on the side of the liquid crystal display panel) as a prism surface on which a number of stripe grooves are arranged in parallel. Generally, the first and second prism sheets are:
The ridge lines of the stripe grooves on the prism surface of the first prism sheet and the ridge lines of the stripe grooves on the prism surface of the second prism sheet are arranged orthogonally. These prism sheets reduce the diffusion angle of light from the cold cathode fluorescent lamp that enters at a large angle by the prism surface of the prism sheet, that is, the light from the cold cathode fluorescent lamp is perpendicular to the liquid crystal display panel. By focusing near the direction,
It is arranged to increase the brightness of the display screen of the liquid crystal display panel. Conventionally, as this prism sheet, as shown in FIG. 6, a prism sheet having a constant pitch (P1) of stripe grooves 31 (hereinafter referred to as a type 1 prism sheet in the present specification) is shown in FIG. Thus, the pitch (P2, P3) of the stripe groove 31 is random,
Further, a prism sheet in which the stripe groove 31 is undulated for each pit (P4) (hereinafter, referred to as a type 2 prism sheet in the present specification) is known. Note that FIG.
7A is a schematic perspective view, and FIG. 7B is a cross-sectional view showing a cross-sectional structure. In a conventional liquid crystal display module, two prism sheets of the first type or two prism sheets of the second type are used as upper and lower prism sheets. The present inventors have studied this prism sheet in order to improve the brightness of the display screen of the liquid crystal display panel. As a result, combining the type 1 and type 2 prism sheets as the upper and lower prism sheets allows the liquid crystal display It has been found that the brightness of the display screen of the panel can be improved as compared with the conventional case. The present invention has been made based on the above findings, and an object of the present invention is to provide a liquid crystal display device in which the brightness of a display screen of a liquid crystal display panel is improved as compared with the related art. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings. [0005] Of the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows. That is, the present invention is a liquid crystal display device having first and second optical elements for condensing irradiation light from a light source, wherein the first optical element has a predetermined interval on a first main surface. And the second optical elements are formed at random intervals on the first main surface, and the ridge direction intersects the ridge direction of the first prism element. It has a plurality of second prism elements, and the second prism elements are arranged such that the ridge lines meander and the ridge line direction is parallel to the extension direction of the light source. In a preferred embodiment of the present invention, the second optical element is disposed between the first optical element and the liquid crystal display panel. In a preferred embodiment of the present invention, the second optical element has a second main surface that is a light diffusing surface for diffusing light from the light source. In a preferred embodiment of the present invention, the liquid crystal display panel has a polarizing plate on a surface facing the first and second optical elements, and faces the first and second optical elements of the polarizing plate. Is a light diffusing surface for diffusing light from the light source. In a preferred embodiment of the present invention, the liquid crystal display panel has a non-absorbing polarizing plate. In a preferred embodiment of the present invention, the liquid crystal display panel has a field-of-view expanding film. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a TFT type liquid crystal display module will be described below in detail. In all the drawings for describing the embodiments,
Those having the same function are denoted by the same reference numerals, and their repeated description will be omitted. <Basic Configuration of TFT-Type Liquid Crystal Display Module of the Present Embodiment> FIG. 1 is an exploded perspective view showing a schematic configuration of a TFT-type liquid crystal display module (LCM) of an embodiment of the present invention. The liquid crystal display module (LCM) shown in FIG. 1 includes a frame-shaped frame (upper case) 4 made of a metal plate, a liquid crystal display panel (LCD) 5, and a backlight unit. LCD panel 5
Is a TFT on which a pixel electrode, a thin film transistor, etc. are formed
A substrate and a filter substrate on which a counter electrode, a color filter, and the like are formed are overlapped with a predetermined gap therebetween, and the two substrates are bonded to each other by a sealing material provided in a frame shape near a peripheral portion between the two substrates. At the same time, liquid crystal is sealed and sealed inside the seal material between the two substrates from a liquid crystal fill opening provided in a part of the seal material, and further, a polarizing plate is stuck outside the two substrates. [0007] A plurality of drain drivers and gate drivers constituted by a semiconductor integrated circuit device (IC) are mounted on a glass substrate of a TFT substrate. Driving power, display data and control signals are supplied to the drain driver via the flexible printed wiring board 1, and driving power and control signals are supplied to the gate driver via the flexible printed wiring board 2. .
These flexible printed circuit boards (1, 2) are connected to a drive circuit board 3 provided behind the backlight unit. The backlight unit according to the present embodiment includes a cold cathode fluorescent lamp 16, a wedge-shaped (trapezoidal side) light guide 9, an upper diffusion sheet 6, an upper prism sheet 7, a lower prism sheet 17, a lower diffusion sheet 8, a reflection light. Sheet 10
In the order shown in FIG. 1, it has side walls 140 and is fitted into a mold 14 formed in a frame shape. FIG.
, 11 is a rubber bush, 12 is a connector, 1
8 and 19 are cables. <Cross-sectional structure of liquid crystal display module shown in FIG. 1> FIG. 2 is a cross-sectional view showing a schematic cross-sectional structure of the liquid crystal display module of the present embodiment. FIG. 2 is a cross-sectional view showing a cross-sectional structure taken along a plane perpendicular to the extension direction (or length direction) of the cold cathode fluorescent lamp 16, and FIG.
0 indicates a backlight unit. As described above, the backlight unit 20 includes a cold cathode fluorescent lamp 16, a wedge-shaped (trapezoidal side) light guide 9, an upper diffusion sheet 6, an upper prism sheet 7, a lower prism sheet 17, and a lower diffusion sheet 8. And the reflection sheet 10 in the order shown in FIG.
It is configured by being fitted into. As shown in FIG. 2, the cold cathode fluorescent lamp 16 is arranged near the side surface of the light guide 9 and along the side surface of the light guide 9 in parallel with the side surface of the light guide 9.
The light guide 9 guides the light emitted from the cold cathode fluorescent lamp 16 to a direction away from the cold cathode fluorescent lamp 16 and uniformly irradiates the entire liquid crystal display panel with the light. Here, the light guide 9 is formed in a shape such as a wedge shape in which a surface facing the cold cathode fluorescent lamp 16 is formed to have a wide width and a cross section becomes smaller as the distance from the cold cathode fluorescent lamp 16 increases. On the light guide, upper and lower diffusion sheets (6, 8) and upper and lower prism sheets (7, 17)
Is arranged. The cold cathode fluorescent lamp portion has a substantially U-shaped cross section and a white or silver reflective sheet 10 covering the cold cathode fluorescent lamp 16 over substantially the entire length and extending to below the light guide 9. Placed. Thus, light emitted in a direction different from that of the light guide 9 can be collected on the light guide 9 without waste. As shown in FIG. 2, a cable (cable on the ground voltage side) 19 for applying a driving voltage to the cold cathode fluorescent lamp 16 is provided on a side wall 140 of the mold 14.
A groove 30 for guiding the cable into which the cable is inserted is formed. The liquid crystal display panel 5 is disposed between the upper frame 4 and the upper diffusion sheet 6. In FIG. 2, SUB
Reference numeral 1 denotes a glass substrate on a TFT substrate side on which a pixel electrode, a thin film transistor, and the like are formed on a substrate; SUB2, a glass substrate on a filter substrate side on which a counter electrode, a color filter, a black matrix, and the like are formed; P
OL2 is a polarizing plate, and these constitute the liquid crystal display panel 5. In FIG. 2, the semiconductor chip (ICd) for driving each pixel of the liquid crystal display panel is a liquid crystal display panel 5.
Although it is mounted on the side where the cold cathode fluorescent lamp 16 is arranged, it may be mounted on the opposite side. Upper and lower prism sheets (7, 17)
Is made of, for example, a polycarbonate film or an acrylic film having a thickness of about 0.15 mm. As shown in FIG. 3, the lower surface is a smooth surface, and the upper surface is formed by a plurality of stripe grooves 31 each having a V-shaped cross section. The array is formed. Note that the V-shaped angle θ of the stripe groove 31 is 90 ° here. Upper and lower prism sheets (7, 17)
Means that the diffusion angle of the light that is diffused and incident at a large angle from the lower diffusion sheet 8 is made smaller by the prism surface formed on the upper surface of the prism sheet (7, 17) (closer to the direction perpendicular to the display screen). It is provided to increase the luminance in the front direction of the display screen. Therefore, the light from the cold cathode fluorescent lamp 16 can be efficiently used, and a bright and uniform display screen can be obtained. As described above, in the conventional liquid crystal display module, as the upper and lower prism sheets (7, 17), two type 1 prism sheets shown in FIG. 6 or type 2 prism sheets shown in FIG. Two prism sheets are used. The upper and lower prism sheets (7, 1
7), a plurality of stripe grooves 31 formed on each prism sheet are arranged so as to be orthogonal to each other, that is, in a direction parallel to the cold cathode fluorescent lamp 16 and a direction perpendicular to the cold cathode fluorescent lamp 16, whereby the lower diffusion sheet 8 The liquid crystal panel 5 condenses light incident from the liquid crystal display panel 5 in the horizontal and vertical directions, thereby improving the luminance of the display screen of the liquid crystal display panel 5 in the front direction. However, as shown in FIG. 4, the surface emission distribution of the light emitted from the light guide 9 (the light emitted from the cold cathode fluorescent lamp 16) is either parallel or perpendicular to the cold cathode fluorescent lamp 16. Different. Therefore, there is a difference in the rate of increase in the luminance of the prism sheet between the case where the arrangement direction of the many stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16 and the case where the arrangement direction is vertical, as shown in FIG.
The arrangement direction of the many stripe grooves 31 is the same as that of the cold cathode fluorescent lamp 1.
In the case of being parallel to 6, the lifting effect is added to the light condensing effect, and the rate of increase in luminance is about 10% larger than when the arrangement direction of the multiple stripe grooves 31 is perpendicular to the cold cathode fluorescent lamp 16. In FIG. 4, a curve (a) is a surface emission distribution of light emitted from the light guide 9 in a direction perpendicular to the cold cathode fluorescent lamp 16, and a curve (b) is parallel to the cold cathode fluorescent lamp 16. Surface emission distribution of light emitted from the light guide 9 in various directions,
The curve (c) shows a case where the arrangement direction of the plurality of stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16, and a case where the light-collecting effect is added to the lifting effect and the luminance is increased. As the upper and lower prism sheets (7, 17), two type 1 prism sheets shown in FIG. 6 are used, two type 2 prism sheets shown in FIG. 7 are used, and FIG. The liquid crystal display panel 5 in a case where two types of prism sheet of type 1 shown in FIG. 6 and prism sheet of type 2 shown in FIG.
Table 1 shows the results of measuring the luminance of the display screen of the above. In addition,
In Table 1, the prism ridge line is parallel to the CFL tube axis.
The arrangement direction of the many stripe grooves 31 is the same as that of the cold cathode fluorescent lamp 1.
6, the case where the prism ridge line is perpendicular to the axis of the CFL tube indicates the case where the arrangement direction of the plurality of stripe grooves 31 is perpendicular to the cold cathode fluorescent lamp 16, and "None" means that the number of stripes is large. The case where the arrangement direction of the groove 31 does not use a prism sheet parallel or perpendicular to the cold cathode fluorescent lamp 16 is shown. Further, in Table 1, the luminance was set to the upper and lower prism sheets (7, 17) as shown in FIG.
The relative luminance when the luminance when two prism sheets are used is set to 100. [Table 1] <Characteristics of the liquid crystal display module of the present embodiment> As can be seen from Table 1, the prism sheet of the type 2 shown in FIG. The brightness in the case where only the prism sheet perpendicular to 16 is used is 64.69, whereas in the type 2 prism sheet shown in FIG. When only the prism sheet parallel to the cold cathode fluorescent lamp 16 is used, the brightness when using only the prism sheet parallel to the cold cathode fluorescent lamp 16 is 70.77. It can be seen that the direction is larger than in the case where the direction is perpendicular to the cold cathode fluorescent lamp 16. As the prism sheet, a type 1 prism sheet shown in FIG.
The arrangement direction of the plurality of stripe grooves 31 is the same as that of the cold cathode fluorescent lamp 16.
The brightness when using only the prism sheet perpendicular to
The brightness when using only the prism sheet of the type 2 prism sheet shown in FIG. 7 in which the arrangement direction of the plurality of stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16 is 69.74. . The brightness is 70.77 when only the prism sheet of the type 2 shown in FIG. 7 in which the arrangement direction of the many stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16 is used as the prism sheet.
Then, the brightness is 69.74 when only the prism sheet of the type 1 shown in FIG. 6 in which the arrangement direction of the many stripe grooves 31 is perpendicular to the cold cathode fluorescent lamp 16 is used.
It is. As described above, the prism sheet shown in FIG.
The type 1 prism sheet shown in FIG. 6 in which only the prism sheet in which the arrangement direction of the many stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16 is used in the type 1 prism sheet shown in FIG.
Brightness is 1.5% (70.77 / 6) as compared with the case where only the prism sheet in which the arrangement direction of the many stripe grooves 31 is perpendicular to the cold cathode fluorescent lamp 16 is used.
(9.74 ≒ 1.015). This is because the type 2 prism sheet shown in FIG.
This is because the ridge line of the prism element formed by 1 is meandering, and the ridge line of the prism element includes an oblique component, and even if used alone, has a light-condensing action of other components. It becomes larger when the arrangement direction of the stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16. Therefore, as shown in Table 1, as the prism sheet (7, 17), a prism sheet of the type 2 shown in FIG. 7 in which the arrangement direction of a large number of stripe grooves 31 is parallel to the cold cathode fluorescent lamp 16; When the prism sheet of the type 1 shown in FIG. 6 is combined with a prism sheet in which the arrangement direction of a large number of stripe grooves 31 is perpendicular to the cold cathode fluorescent lamp 16, the luminance is 100.31, which is the same as the conventional prism sheet. Prism sheet (7,
17), when the type 2 prism sheet shown in FIG. 7 is combined (the luminance is 97.90 in Table 1), or when the type 1 prism sheet shown in FIG. 6 is combined (in Table 1, the luminance is shown). However, it is possible to improve the brightness as compared with 100). As described above, the present invention combines the type 2 prism sheet shown in FIG. 7 and the type 1 prism sheet shown in FIG. 6 as the upper and lower prism sheets (7, 17) to provide a liquid crystal display. The brightness of the display screen of panel 5 is improved. Conventionally, even when the type 2 prism sheet shown in FIG. 7 and the type 1 prism sheet shown in FIG. 6 are combined as the upper and lower prism sheets (7, 17), the brightness of the display screen of the liquid crystal display panel 5 is reduced. It was thought that there would be no difference. As the upper and lower prism sheets (7, 17), type 2 shown in FIG.
It is possible to improve the brightness of the display screen of the liquid crystal display panel 5 by combining the prism sheet of FIG. 6 with the prism sheet of type 1 shown in FIG.
It has been clarified for the first time by the present inventors. It should be noted that the prism sheet of the present embodiment can be combined with the type 2 prism sheet shown in FIG. 7 and the type 1 prism sheet shown in FIG.
May be an upper prism sheet or a lower prism sheet. [Modification of the Embodiment] The upper diffusion sheet 6 shown in FIGS. 1 and 2 is an upper and lower prism sheet (7,
17) is provided in order to prevent the minute defects of the prism from being noticeable, but a part of the light transmitted through the upper diffusion sheet 6 is absorbed by the upper diffusion sheet 6. Therefore, when the upper diffusion sheet 6 is arranged, the brightness of the display screen of the liquid crystal display panel 5 is lower than when the upper diffusion sheet 6 is not arranged. Table 2 shows an example of actual measurement results of the luminance of the display screen of the liquid crystal display panel 5 and the difference between the case where the upper diffusion sheet 6 is not disposed and the case where the upper diffusion sheet 6 is disposed. Also,
As a result of the experiment, the type 2 prism sheet shown in FIG.
Although not as high as the upper diffusion sheet 6, the diffusion effect was found to be about half that of the upper diffusion sheet 6. Therefore, in the present embodiment, the upper diffusion sheet 6 can be omitted. Thus, the transmittance loss of 5% shown in Table 2 due to the arrangement of the upper diffusion sheet 6 can be prevented, and the weight of the liquid crystal display module can be reduced. For example, by omitting the upper diffusion sheet 6 for a 15-inch liquid crystal display panel, about 10 g (30 cm
(Width) × 24cm (length) × 0.012cm (thickness) ≒ 1
0g) It is possible to reduce the weight. [Table 2] Further, in this embodiment, the upper diffusion sheet 6 is formed by using the type 2 prism sheet shown in FIG.
In the case where is omitted, as shown in FIG. 5, a diffusion effect may be improved by attaching silica beads 35 or the like to the surface opposite to the prism surface. In this case, the type 2 prism sheet shown in FIG. 7 is preferably used as the upper prism sheet 7. Similarly,
The diffusion effect can be obtained by matting the surface of the lower polarizing plate (POL1) on the backlight unit side or by attaching silica beads or the like to the surface of the lower polarizing plate (POL1) on the backlight unit side. And the upper diffusion sheet 6 may be omitted. In addition, by adopting a non-absorption type polarizing plate below the polarizing plate (POL1), the liquid crystal display panel 5 is further improved.
Of the display screen can be improved. It is also effective for a liquid crystal display panel using a viewing angle widening film. The prism sheet (7, 17) may be of various materials, thicknesses, configurations, and the like. For example, the cross-sectional shape of the prism sheet (7, 17) is not limited to that shown in FIG. 3, and for example, the peak of the prism surface may be round instead of having a sharp shape. Various angles and pitches of the V-shaped peaks and valleys of the V-shaped stripe groove can be used in consideration of the refractive index of the material. Further, in the above embodiment,
Although the embodiment in which the present invention is applied to an active matrix type liquid crystal display device has been described, the present invention is not limited to this, and is applicable to a simple matrix type liquid crystal display device. Needless to say.
As described above, the invention made by the inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and can be variously modified without departing from the gist of the invention. Needless to say, The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the brightness | luminance of the display screen of a liquid crystal display panel compared with the former.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a schematic configuration of a TFT type liquid crystal display module (LCM) according to an embodiment of the present invention. FIG. 2 is a sectional view showing a schematic sectional structure of the liquid crystal display module shown in FIG. FIG. 3 is a cross-sectional view illustrating a conventional prism sheet. FIG. 4 is a diagram for explaining a surface emission distribution of light emitted from a light guide. FIG. 5 is a sectional view showing a modification of the prism sheet according to the embodiment of the present invention. FIG. 6 is a diagram illustrating an example of a conventional prism sheet. FIG. 7 is a view showing another example of a conventional prism sheet. [Description of Signs] 1, 2 ... Flexible printed wiring board, 3 ... Drive circuit board, 4 ... Frame, 5 ... Liquid crystal display panel, 6, 8 ... Diffusion sheet, 7 ... Second prism sheet, 9 ... Light guide , 1
0: Reflective sheet, 11: Rubber bush, 12: Connector, 14: Mold, 16: Cold cathode fluorescent lamp, 17: First
Prism sheet, 18, 19 ... cable, 20 ... backlight unit, 30 ... cable guide groove, 31 ... stripe groove, 35 ... silica beads, 140 ... side wall, SU
B1, SUB2: glass substrate, POL1, POL2: polarizing plate, ICd: semiconductor chip.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 324 G09F 9/00 324 9/35 9/35 (72) Inventor Toshikazu Miyauchi Mobara-shi, Chiba 3300 Hayano F-term in Display Group, Hitachi, Ltd.

Claims (1)

  1. Claims: 1. A liquid crystal display panel having a pair of substrates, a liquid crystal sandwiched between the pair of substrates, and disposed on a side opposite to a display surface of the liquid crystal display panel. A liquid crystal display device comprising: a backlight; a light source configured to irradiate the liquid crystal display panel with irradiation light; and first and second optical elements configured to collect the irradiation light from the light source. The first optical element has a large number of first prism elements formed at regular intervals on a first main surface, and the second optical element has a random number on a first main surface. A plurality of second prism elements that are formed at regular intervals and whose ridge direction intersects with the ridge direction of the first prism element. The second prism element has a ridge line meandering and a ridge line direction. Are arranged in parallel with the extension direction of the light source The liquid crystal display device which is characterized in that. 2. The liquid crystal display device according to claim 1, wherein the second optical element is disposed between the first optical element and the liquid crystal display panel. 3. The liquid crystal display device according to claim 1, wherein the second optical element has a second main surface that is a light diffusion surface for diffusing light from the light source. . 4. The liquid crystal display panel has a polarizing plate on a surface facing the first and second optical elements, and a surface of the polarizing plate facing the first and second optical elements, The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a light diffusion surface that diffuses light from the light source. 5. The liquid crystal display device according to claim 1, wherein the liquid crystal display panel has a non-absorption type polarizing plate. 6. The liquid crystal display device according to claim 5, further comprising a diffusion sheet between the non-absorption type polarizing plate and the second prism element of the second optical element. 7. The liquid crystal display device according to claim 1, wherein the liquid crystal display panel has a field-of-view expanding film. 8. The liquid crystal display device according to claim 7, further comprising a diffusion sheet between the field-of-view expanding film and the second prism element of the second optical element.
JP2001333721A 2001-10-31 2001-10-31 Liquid crystal display device Pending JP2003140126A (en)

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