JP2002182184A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a liquid crystal display device capable of improving assembling accuracy and effectively preventing light leakage and entry of foreign matter. SOLUTION: A liquid crystal display panel 62 composed of an upper frame 1 having a display window 3, a liquid crystal plate integrated with a drive circuit board 35, and a light guide assembly 37 composed of a light diffusion plate and a light guide plate.
And a frame-shaped intermediate frame 42 that accommodates the light guide assembly 37 and mounts a linear backlight light source 36 on at least one side, and the lower frame 2 are stacked in this order, and the upper frame 1 and the lower frame 2 are stacked. The inner side of the intermediate frame 42 for accommodating the light guide assembly 37 is connected and fixed to the frame 2 to cover each side of the light guide assembly from the liquid crystal display panel side.
A frame-shaped spacer composed of -1, 13-2, 13-3, and 13-4 was integrally formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device,
The present invention relates to a field-effect liquid crystal display device having particularly excellent time-division driving characteristics and capable of displaying monochrome and multicolor images.

[0002]

2. Description of the Related Art As one type of liquid crystal display device, a twisted nematic type (TN) is a 90-degree twisted helical structure formed by a nematic liquid crystal having a positive dielectric anisotropy between two electrode substrates. And a polarizing plate is disposed outside the two electrode substrates such that the polarization axis (or absorption axis) is orthogonal or parallel to the liquid crystal molecules adjacent to the electrode substrate (Japanese Patent Publication No. 51-1971). -136
No. 66).

[0003] Such a liquid crystal display element having a twist angle (α) of 90 degrees has problems in the steepness (γ) of the change in the transmittance of the liquid crystal layer with respect to the voltage applied to the liquid crystal layer and the viewing angle characteristics. ,
The number of time divisions (corresponding to the number of scanning electrodes) was 64, which was a practical limit. However, in order to cope with recent demands for improving the image quality and increasing the amount of display information for liquid crystal display devices, a super twisted nematic (STN) having a twist angle α of liquid crystal molecules larger than 180 degrees has been proposed, and the STN has a birefringence. It is important to improve the time-sharing drive characteristics by using the effect to increase the number of time-sharing.
Letter 45, No. 10, 1021 1984 (Applied Physics Lette
r, TJScheffer, J.Nehring: "A new, highly multiplexab
le liquidcrystal display "), and a super twisted birefringence effect (SBE) liquid crystal display device has been proposed.

A liquid crystal display device of this type includes a liquid crystal display panel including an upper frame having a display window and a liquid crystal plate on which a drive circuit board is integrated, a light guide assembly including a light diffusion plate and a light guide plate, and An intermediate frame accommodating the light guide assembly and mounting a linear backlight source on at least one side, and at least a lower frame, are stacked in the above order,
The upper frame and the lower frame are connected and fixed.

FIG. 12 is an exploded perspective view for explaining the structure of a conventional liquid crystal display device, wherein 1 is an upper frame, 3 is a liquid crystal display window, 62 is a liquid crystal display panel, 35 is a drive circuit board, 1
Reference numeral 3 denotes a frame-shaped spacer; 37, a light guide assembly including a light diffusion plate and a light guide plate; 42, an intermediate frame on which a linear backlight source is mounted; 36, a backlight source (lamp) including a cold cathode tube; Denotes a lamp cover, and 2 denotes a lower frame.

Reference numeral 18 denotes a cut-and-raised piece soldered to the ground pad 24 formed on the drive circuit board 35;
Reference numeral 20 denotes a nail fixed to a nail receiver 25 formed on the lower frame 2, and reference numeral 14 denotes an adhesive tape for fixing the upper frame 1 to the liquid crystal display panel 62.

In FIG. 1, a liquid crystal display device is sandwiched and fixed between an upper frame 1 and a lower frame 2 in the order shown. At one end of the intermediate frame 42, a linear light source (backlight light source) 36 composed of a cold cathode tube is installed.
At 7, the direct light in the direction of the liquid crystal display panel 62 is blocked, and the emitted light is directed to the light guide assembly 37 composed of the light diffusion plate and the light guide plate.

The frame-shaped spacer 13 is interposed between the liquid crystal display panel 62 and the light guide assembly 37 installed in the concave portion formed in the intermediate frame 42 to define a display area, and the light guide assembly 37 is provided. To prevent light from leaking from and intrusion of foreign matter.

It is also known that a sponge-like silicon rubber piece is used on each side instead of the frame-like spacer 13 as described above.

FIG. 13 is an explanatory view of an intermediate frame portion used in a conventional liquid crystal display device. FIG. 13A is a perspective view showing a state in which a frame-shaped spacer 13 is placed at a predetermined position, and FIG. (A) is a partial cross-sectional view of AA ', BB', and CC 'in (a), and (c) is a partial cross-sectional view of DD' in (a).

As shown in FIG. 1A, the frame-shaped spacer 13 covers the side of the light guide assembly 37 housed inside the frame of the intermediate frame 42 from above (the liquid crystal display panel side). Placed on

It is to be noted that one side of the light guide assembly 37 extends to a position close to the backlight light source 36 and receives light from the backlight light source 36.

That is, as can be seen from the cross-sectional views (b) and (c), each side of the light guide assembly 37 has a frame-shaped spacer 1.
3 prevents light leakage and foreign matter intrusion by being covered from above.

[0014]

In the above-mentioned conventional liquid crystal display device, the spacers 13 of the frame covering each side of the light guide assembly are manufactured by pressing a resin sheet such as polyethylene terephthalate (PET). Therefore, there is a problem in that the so-called material taking efficiency is low, the alignment work with the intermediate frame is difficult, and it is difficult to assemble with high accuracy.

In addition, when the sponge-like silicon rubber piece is used for each side in place of the frame-like spacer, there is a problem that the alignment work with the intermediate frame is more difficult than the above-mentioned frame-like spacer.

It is an object of the present invention to provide a liquid crystal display device which solves the above-mentioned problems of the prior art, improves the assembling accuracy, and can effectively prevent light leakage and foreign matter intrusion.

[0017]

In order to achieve the above object, the present invention relates to a liquid crystal panel having an upper frame 1 having a display window 3 and a driving circuit board 35 as shown in FIG. Liquid crystal display panel 62, a light guide assembly 37 including a light diffusing plate and a light guide plate, and a frame-shaped intermediate body that accommodates the light guide assembly 37 and mounts a linear backlight light source 36 on at least one side. In the liquid crystal display device in which the frame 42 and the lower frame 2 are laminated in this order, and the upper frame 1 and the lower frame 2 are connected and fixed,

As shown in FIG. 2, the intermediate frame 4
2 that covers the sides of the light guide assembly from the liquid crystal display panel side.
-1, 13-2, 13-3, and 13-4 are integrally molded.

[0019]

The respective side spacers 13-1, 13-2, 13 for covering the respective sides of the light guide assembly from the liquid crystal display panel side on the inner side of the intermediate frame 42 which accommodates the light guide assembly 37.
By integrally molding the frame-shaped spacer composed of -3 and 13-4, there is no need to prepare a separate spacer as in the related art, and positioning work with the light guide assembly is not required, and light leakage occurs. And a high-precision liquid crystal display device free from intrusion of foreign substances and foreign substances can be provided.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view illustrating the configuration of a liquid crystal display device according to the present invention, where 1 is an upper frame,
3 is a liquid crystal display window, 62 is a liquid crystal display panel, 35 is a drive circuit board, and 13-1, 13-2, 13-3, and 13-4 are frame-shaped spacers formed integrally with the intermediate frame. A side spacer, 37 is a light guide assembly composed of a light diffusion plate and a light guide plate, 42 is an intermediate frame on which a linear backlight light source 36 is mounted, 36 is a backlight light source (lamp) composed of a cold cathode tube, and 17 is a lamp. The cover 2 is a lower frame.

Reference numeral 18 denotes a cut-and-raised piece soldered to the ground pad 24 formed on the drive circuit board 35;
20 is a nail fixed to a nail receiver 25 formed on the lower frame;
Reference numeral 14 denotes an adhesive tape for fixing the upper frame 1 and the liquid crystal display panel. In the figure, a liquid crystal display device is sandwiched and fixed between an upper frame 1 and a lower frame 2 in the order shown. At one end of the intermediate frame 42, a linear light source (backlight light source) 36 composed of a cold cathode tube is installed.
At 7, the direct light in the direction of the liquid crystal display panel 62 is blocked, and the emitted light is directed to the light guide assembly 37 composed of the light diffusion plate and the light guide plate.

The light guide assembly 37 is provided on each side 13-1, 1 constituting a frame spacer integrally formed on the intermediate frame 42.
Each side is covered with 3-2, 13-3, and 13-4 to prevent light leakage from the backlight light source 36 and entry of foreign matter.

FIGS. 2A and 2B illustrate the structure of an intermediate frame constituting an embodiment of the liquid crystal display device according to the present invention, wherein FIG. 2A is a perspective view, and FIG. 2B is a view showing AA 'and BB' in FIG. , CC '
FIG. 1C is a sectional view taken along line DD ′ of FIG. 1A, and the same reference numerals as those in FIG. 1 correspond to the same parts.

As shown in the figure, the intermediate frame 42 accommodates the light guide assembly 37 and each side constituting a frame-shaped spacer covering each side of the light guide assembly from the liquid crystal display panel side. Spacers 13-1, 13-2, 13-3, 1
3-4 are integrally formed, and the light guide assembly is housed from below the intermediate frame 42 so that each side of the light guide assembly is located at each of the side spacers 13-1, 13-2, 13-3, 13-. 4, one side is exposed in the direction of the backlight light source 36 and arranged to receive light from the backlight light source 36.

That is, since the sides 13-1, 13-2, 13-3, and 13-4 constituting the frame-shaped spacer are formed integrally with the intermediate frame 42, these spacers are formed around the liquid crystal display panel. No light leakage occurs, and no foreign matter enters between the light guide assembly and the liquid crystal display panel.

The side spacers 13-1, 13-2, 13-3, and 13-4 constituting the frame-shaped spacer are manufactured integrally with the intermediate frame 42, so that the number of parts is reduced. It is possible to reduce the cost and improve the cost and work efficiency.

A specific example in which the above configuration is applied to a super twisted nematic (STN) type liquid crystal display device will be described below. In the following drawings, those having the same functions are denoted by the same reference numerals, and their repeated description will be omitted.

FIG. 3 shows a liquid crystal display device 62 according to the present invention as viewed from above, in which liquid crystal molecules are arranged (eg, rubbing direction), the liquid crystal molecules are twisted, and the polarizing axis (or absorption axis) of the polarizing plate. 4) shows a direction and an optical axis direction of a member providing a birefringence effect. FIG. 4 is a perspective view of a main part of a liquid crystal display device 62 according to the present invention.

The twist direction 10 and the twist angle θ of the liquid crystal molecules
The rubbing direction 6 of the alignment film 21 on the upper electrode substrate 11 and the rubbing direction 7 of the alignment film 22 on the lower electrode substrate 12 and the nematic liquid crystal layer 50 sandwiched between the upper electrode substrate 11 and the lower electrode substrate 12 It is defined by the type and amount of the optical rotation substance added.

In FIG. 4, in order to align the liquid crystal molecules in a twisted spiral structure between the two upper and lower electrode substrates 11 and 12 sandwiching the liquid crystal layer 50, the upper and lower electrode substrates 1 and 12 are required.
The surfaces of the alignment films 21 and 22 made of an organic polymer resin made of, for example, polyimide, in contact with the liquid crystal on
For example, a method of rubbing in one direction with a cloth or the like, a so-called rubbing method is employed. The rubbing direction at this time, that is, the rubbing direction, that is, the rubbing direction 6 in the upper electrode substrate 11 and the rubbing direction 7 in the lower electrode substrate 12 is the alignment direction of the liquid crystal molecules.

On the two sheets thus oriented,
The lower electrode substrates 11 and 12 are moved in the respective rubbing directions 6, 7
Intersect at approximately 180 to 360 degrees with each other
Gap d ₁And the two electrode substrates 11 and 12
With a cutout 51 for injecting liquid crystal
Bonded by the sealing material 52, and a positive dielectric anisotropy
Encloses nematic liquid crystal with a predetermined amount of optical rotation substance
Then, the liquid crystal molecules have a twist angle θ between the electrode substrates in the figure.
Has a helical structure. 31 and 32 are
These are the upper and lower electrodes, respectively.

A member (hereinafter, referred to as a birefringent member) 40 for providing a birefringence effect is disposed above the upper electrode substrate 11 of the liquid crystal cell 60 thus configured. Upper and lower polarizers 15 and 16 are provided with the cell 60 interposed therebetween.

The twist angle θ of the liquid crystal molecules in the liquid crystal 50 is preferably from 200 degrees to 300 degrees, but is excellent in avoiding the phenomenon that the lighting state near the threshold of the transmittance-applied voltage curve becomes an alignment that scatters light. From the practical viewpoint of maintaining the time division characteristic, the range of 230 degrees to 270 degrees is more preferable.

This condition basically acts to make the response of the liquid crystal molecules to the voltage more sensitive and to realize excellent time-division characteristics. In order to obtain excellent display quality, the product [Delta] n ₁ · d ₁ of the refractive index anisotropy [Delta] n ₁ and a thickness d ₁ of the liquid crystal layer 50 is preferably from the 0.5 [mu] m 1.0 micron
m, more preferably in the range of 0.6 μm to 0.9 μm.

The birefringent member 40 functions to modulate the polarization state of the light transmitted through the liquid crystal cell 60, and converts the liquid crystal cell 60, which could only be colored, to black and white display. For this purpose, the product [Delta] n ₂ · d ₂ of the refractive index anisotropy [Delta] n ₂ and the thickness d ₂ of the birefringent member 40 is extremely important, 0.8 micron preferably from 0.4μm
m, more preferably in the range of 0.5 μm to 0.7 μm.

Further, since the liquid crystal display device 62 according to the present invention utilizes elliptically polarized light due to birefringence, the polarizing plate 15,
In the case where a uniaxial transparent birefringent plate is used as the birefringent member 40, the relationship between the optical axis and the liquid crystal alignment directions 6 and 7 of the electrode substrates 11 and 12 of the liquid crystal cell 60 is extremely important. .

The operation and effect of the above relationship will be described with reference to FIG. This figure shows the relationship between the axis of the polarizing plate, the optical axis of the uniaxial transparent birefringent member, and the liquid crystal array direction of the electrode substrate of the liquid crystal cell when the liquid crystal display device having the configuration of FIG. 4 is viewed from above. is there.

In FIG. 3, 5 is the optical axis of the uniaxial transparent birefringent member 40, 6 is the liquid crystal alignment direction of the birefringent member 40 and the adjacent upper electrode substrate 11, and 7 is the liquid crystal alignment of the lower electrode substrate 12. The direction 8 is an absorption axis or a polarization axis of the upper polarizing plate 15, the angle α is the angle between the liquid crystal alignment direction 6 of the upper electrode substrate 11 and the optical axis 5 of the uniaxial birefringent member 40, and the angle β is the upper direction. The angle and angle γ between the absorption axis or polarization axis 8 of the polarizing plate 15 and the optical axis 5 of the uniaxial transparent birefringent member 40 are determined by the absorption axis or polarization axis 9 of the lower polarizing plate 16 and the lower electrode substrate 1.
2 is an angle formed with the liquid crystal alignment direction 7.

Here, how to measure the angles α, β, γ is defined. In FIG. 8, an example will be described in which the intersection angle between the optical axis 5 of the birefringent member 40 and the liquid crystal alignment direction 6 of the upper electrode substrate 11 is used.

The intersection angle between the optical axis 5 and the liquid crystal alignment direction 6 is shown in FIG.
Can be represented by φ ₁ and φ ₂ as shown in
Here, the smaller angle of φ ₁ and φ ₂ is adopted.
That is, since φ ₁ <φ ₂ in FIG. 8A, φ ₁ is the intersection angle between the optical axis 5 and the liquid crystal alignment direction 6, and φ ₁ > φ ₂ in FIG. 8B. Therefore, φ ₂ is the intersection angle between the optical axis 5 and the liquid crystal alignment direction 6. Of course φ ₁ = φ
_In the case of ₂ , either may be adopted.

In this type of liquid crystal display, the angles α, β, and γ are extremely important. Is preferably 5
From 0 degrees to 90 degrees, more preferably from 70 degrees to 90 degrees,
Is preferably between 20 and 70 degrees, more preferably between 30 and 60 degrees, and angle γ is preferably between 0 and 70 degrees.
Degrees, more preferably from 0 to 50 degrees.

If the twist angle θ of the liquid crystal layer 50 of the liquid crystal cell 60 is in the range of 180 ° to 360 °, the angle α can be obtained regardless of whether the twist direction 10 is the clockwise direction or the counterclockwise direction. , Β, and γ may be within the above ranges.

In FIG. 4, the birefringent member 40 is disposed between the upper polarizing plate 15 and the upper electrode substrate 11, but instead is disposed between the lower electrode substrate 12 and the lower polarizing plate 16. May be provided. In this case, the entire configuration of FIG. 4 is inverted.

[Specific Example 2] The basic structure is the same as that shown in FIGS. In FIG. 5, the twist angle θ of the liquid crystal molecules is 240 degrees, and the uniaxial transparent birefringent member 4
As 0, a liquid crystal cell having a parallel orientation (homogeneous orientation), that is, a twist angle of 0 degree was used.

Here, the thickness d (μm) of the liquid crystal layer and the optical rotation
Spiral pitch p (μm) of the liquid crystal material to which the substance is added
The ratio d / p was about 0.53. The alignment films 21 and 22 are made of poly.
It is made of imide resin film and rubbed
used. The rubbed alignment film is in contact with this.
Angle at which tilting liquid crystal molecules are tilted with respect to the substrate surface
(Pretilt angle) is about 4 degrees. Uniaxial transparent above
Δn of the birefringent member 40 _Two・ D_TwoIs about 0.6 μm.
On the other hand, the liquid crystal layer 50 having a structure in which liquid crystal molecules are twisted by 240 degrees
Δn₁・ D₁Is about 0.8 μm.

At this time, by setting the angle α to about 90 degrees, the angle β to about 30 degrees, and the angle γ to about 30 degrees, the voltage applied to the liquid crystal layer 50 via the upper and lower electrodes 31 and 32 is reduced. When the voltage is equal to or less than the threshold, light opaque, that is, black, is obtained. When the axis of the lower polarizing plate 16 is rotated from 50 degrees to 90 degrees from the above position, the white color is applied when the voltage applied to the liquid crystal layer 50 is equal to or less than the threshold, and the black color is applied when the voltage is equal to or more than the threshold. Black and white display was realized.

FIG. 6 shows a change in contrast during time-division driving at 1/200 duty when the angle α is changed in the configuration of FIG. When the angle α is around 90 degrees, the contrast is extremely high, but the contrast decreases as the angle α deviates from this angle. In addition, when the angle α is small, the lighted portion and the non-lighted portion are both bluish, and when the angle α is large, the non-lighted portion is purple and the lighted portion is yellow. The results are almost the same for the angles β and γ. However, in the case of the angle γ, when the image is rotated from 50 degrees to nearly 90 degrees as described above, the reverse black and white display is obtained.

"Specific Example 3" The basic structure is the same as that of "Specific Example 2".
Is the same as However, the twist angle of the liquid crystal molecules of the liquid crystal layer 50 is 260 degrees, and Δn ₁ · d ₁ is about 0.65 μm to 0.75 μm.
The difference is that it is 5 μm. Δn ₂ · d ₂ of the parallel alignment liquid crystal layer used as the uniaxial transparent birefringent member 40 is about 0.58 μm, which is the same as in “Specific Example 2”.

At this time, by setting the angle α to about 100 degrees, the angle β to about 35 degrees, and the angle γ to about 15 degrees, the same monochrome display as that of the “Example 1” was realized. Also, as in the case of "Specific Example 2", by rotating the position of the axis of the lower polarizing plate by 50 to 90 degrees from the above value, it is possible to perform inverted black and white display. The inclination with respect to the deviation of the angles α, β, γ is almost the same as in “Specific Example 2”.

In each of the above embodiments, the uniaxial transparent birefringent member 40 is a parallel alignment liquid crystal cell having no twist of liquid crystal molecules. However, a liquid crystal layer having twisted liquid crystal molecules of about 20 to 60 degrees is used. When used, the color change due to the angle is small. This twisted liquid crystal layer corresponds to the liquid crystal layer 5 described above.
Similarly to the case of 0, the liquid crystal is formed by sandwiching a liquid crystal between the pair of transparent substrates which have been subjected to the alignment processing so that the alignment processing directions intersect at a predetermined twist angle. In this case, the direction of the bisecting angle between the two alignment processing directions sandwiching the twisted structure of the liquid crystal molecules may be treated as the optical axis of the birefringent member.

Further, a transparent polymer film may be used as the birefringent member 40 (in this case, a uniaxially stretched one is preferable). In this case, the polymer film is PET
(Polyethylene terephthalate), acrylic resin, and polycarbonate are effective.

Further, in the above specific examples, the birefringence
Although the member was single, in FIG.
Between the lower electrode substrate 12 and the lower polarizer 16.
One birefringent member can be inserted. in this case
Is the Δn of these birefringent members. _Two・ D_TwoIf you readjust
Good.

[Specific Example 4] The basic structure is the same as that of "Specific Example 2". However, as shown in FIG.
Red, green, and blue color filters 33R, 22G, 33
B. Multi-color display is possible by providing the light shielding film 33D between the filters. FIG. 7 shows the relationship between the arrangement direction of the liquid crystal molecules, the twist direction of the liquid crystal molecules, the direction of the axis of the polarizing plate, and the optical axis of the birefringent member in "Specific Example 4".

In FIG. 9, a smooth layer 23 made of an insulator is formed on each of the color filters 33R, 22G, 33B and the light shielding film 33D to reduce the influence of these irregularities. An upper electrode 31 and an alignment film 21 are formed.

FIG. 10 shows a block diagram in which the liquid crystal display module 63 according to the present invention shown in FIG. 1 is used for a display section of a laptop personal computer, and FIG.

In FIG. 10, the microprocessor 49
The liquid crystal display module is driven by the driving IC 34 via the control LSI 48 based on the result calculated in the above.

According to the present embodiment configured as described above, it is possible to provide a liquid crystal display device which has no display unevenness due to heat generation of the backlight light source, and has improved luminance by eliminating leakage current of the backlight. it can.

The invention described in the claims of the present invention is not limited to the above-mentioned STN type liquid crystal display device, but can be similarly applied to other types of liquid crystal display devices equipped with a backlight. It is.

[0059]

As described above, according to the present invention,
The lower frame that holds the liquid crystal display unit together with the upper frame is made of aluminum thin plate to reduce the weight of the liquid crystal display device and improve the heat radiation effect of the backlight light source.
Further, a cutout provided at a position symmetrical to a line orthogonal to the center of the backlight light source over at least a region of the liquid crystal display panel in a direction orthogonal to the backlight light source forms a uniform temperature distribution over the entire surface of the liquid crystal display panel. In addition, it is possible to prevent uneven display.

The leakage current of the backlight is reduced by at least two cutout portions provided in the longitudinal direction of the backlight directly below the backlight light source and cutouts provided below both ends of the backlight light source. It is possible to provide a variety of liquid crystal display devices capable of obtaining a high-quality image display by reducing the brightness and suppressing a decrease in luminance.

[0061]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating the configuration of an embodiment of a liquid crystal display device according to the present invention.

FIGS. 2A and 2B are perspective views illustrating the structure of an intermediate frame constituting one embodiment of a liquid crystal display device according to the present invention; FIGS.
(B) is an AA ′, BB ′, CC ′ sectional view of (a), and (c) is a DD ′ sectional view of (a).

FIG. 3 is an explanatory diagram showing the relationship among the alignment direction of liquid crystal molecules, the twist direction of liquid crystal molecules, the direction of the axis of a polarizing plate, and the optical axis of a birefringent member in the specific example 1 of the liquid crystal display device according to the present invention.

FIG. 4 is a perspective view of an essential part for explaining a stacking relation of components of the liquid crystal display device according to the present invention.

FIG. 5 is an explanatory diagram showing the relationship among the alignment direction of liquid crystal molecules, the twist direction of liquid crystal molecules, the direction of the axis of a polarizing plate, and the optical axis of a birefringent member in a specific example 2 of the liquid crystal display device according to the present invention.

FIG. 6 is an explanatory diagram of contrast and transmitted light color-intersection angle α characteristics in the specific example 1 of the liquid crystal display device according to the present invention.

FIG. 7 is an explanatory diagram showing the relationship among the arrangement direction of liquid crystal molecules, the twist direction of liquid crystal molecules, the direction of the axis of a polarizing plate, and the optical axis of a birefringent member in Example 3 of the liquid crystal display device according to the present invention.

FIG. 8 shows an angle of intersection α,
FIG. 4 is an explanatory diagram of how to measure β and γ.

FIG. 9 is a partially cutaway perspective view illustrating the configuration of an upper electrode substrate in the liquid crystal display device according to the present invention.

FIG. 10 is a block diagram in a case where the liquid crystal display device according to the present invention is used for a display unit of a laptop personal computer.

FIG. 11 is an external view of a case where the liquid crystal display device according to the present invention is used for a display unit of a laptop personal computer.

FIG. 12 is an exploded perspective view illustrating a configuration of a conventional liquid crystal display device.

13A and 13B are explanatory views of an intermediate frame portion used in a conventional liquid crystal display device, where FIG. 13A is a perspective view showing a state where a frame-shaped spacer is placed at a predetermined position, and FIG. a) AA ′, BB ′, CC ′ partial cross-sectional view of FIG.
(C) is a partial sectional view taken along the line DD ′ of (a).

[Explanation of symbols]

Reference Signs List 1 upper frame 2 lower frame 3 liquid crystal display window 13-1, 13-2, 13-3, 13-4 spacer 14 adhesive tape fixing upper frame and liquid crystal display panel 17 lamp cover 18 ground formed on drive circuit board Cut-and-raised pieces soldered to the pad 20 Claws fixed to the claw receivers formed on the lower frame 24 Ground pads 25 Claw receivers 35 Drive circuit board 36 Backlight light source (lamp) composed of a cold cathode tube 37 Light diffusion plate and light guide plate Light guide assembly composed of 42 An intermediate frame on which a linear backlight is mounted 62 A liquid crystal display panel.

Continued on the front page F-term (reference) 2H089 HA40 JA10 QA05 QA08 TA13 TA20 2H091 FA23Z FA34X FA41Z FD06 FD12 LA03 LA07 5C094 AA03 AA25 AA43 AA47 AA48 AA54 BA43 BA45 CA19 CA24 DB02 EB02 ED01 A01 A01 EB13 A01 A01 BB CC09 CC12 EE03 EE04 EE05 EE07 EE09 EE13 EE27 EE36 FF05 FF06 FF08 KK02

Claims (3)

[Claims] 1. A liquid crystal display device comprising a liquid crystal display panel and a frame accommodating a light guide plate inside the liquid crystal display panel, wherein the frame has a light-shielding portion covering a side of the light guide plate from the liquid crystal display panel side. A liquid crystal display device which is formed integrally. 2. The liquid crystal display device according to claim 1, wherein the frame has a light source mounted on at least one side. 3. The light source according to claim 1, wherein the light source is mounted on a side where the light shielding portion is formed.
3. The liquid crystal display device according to 1.