JPH06347814A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To surely ground a driving circuit board and to facilitate the removal thereof. CONSTITUTION:This liquid crystal display device is provided with at least a ground pad 24-B formed on the surface on the side opposite to an upper frame 1 of the driving circuit board 35 and a conductive grip 76 for elastically clamping this ground pad and a recessed part 75 formed as a part of the upper frame 1 brought into contact with the surface of the driving circuit board 35 on the side opposite to the ground pad 4-B. The grounding of the driving circuit board 35 is thus assured and the release of the frame 1 from the driving circuit board 35 is made free. Since a part of the upper frame 1 and the ground pad 24 of the driving circuit board 35 are clamped by the conductive clip 76, the grounding of the upper frame 1 and the driving circuit board 35 is surely attained. Since the attachment and detachment of the clip 76 are easy, the assembly and dismounting are extremely simplified.

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 monochrome and multicolor display.

[0002]

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

In such a liquid crystal display device having a twist angle (α) of 90 degrees, there are problems in terms of the steepness (γ) of the change in the transmittance of the liquid crystal layer versus the voltage applied to the liquid crystal layer and the viewing angle characteristic. ,
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 the recent demands for improving the image quality and increasing the display information amount for liquid crystal display elements, a super twisted nematic (STN) has been proposed in which the twist angle α of liquid crystal molecules is larger than 180 degrees, and the birefringence of this STN is Applied Physics is to improve the time-division drive characteristics and increase the number of time-division by utilizing the effect.
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.

This type of liquid crystal display device includes a liquid crystal display panel including an upper frame having a display window, a liquid crystal plate in which a drive circuit board is integrated, a light guide assembly including a light diffusion plate and a light guide plate, It has at least an intermediate frame on which a linear bakulite light source is mounted on at least one side and a lower frame,
These are laminated in the above order, and the upper frame and the lower frame are connected and fixed.

The upper frame and the lower frame are made of thin iron plates, and if necessary, an appropriate spacer or adhesive tape or the like is interposed between the respective constituent members so that the whole is closely laminated and integrally formed. It is fixedly held so that it can be handled.

[0006]

In the above-mentioned conventional liquid crystal display device, the following is known as the grounding means of the drive circuit board constituting the liquid crystal display panel. 12
FIG. 4 is a cross-sectional view of a main part for explaining a typical example of a grounding structure of a drive circuit board that constitutes a liquid crystal display panel according to the conventional technique.

In FIG. 1A, a claw 7 is provided on the upright side of the upper frame 1.
7 is provided, the drive circuit board 35 is installed between the upper frames 1 via the elastic spacer 78, and the drive circuit board 35 is grounded by caulking the claw 77 to the ground pad 24 formed on the drive circuit board 35. . Further, in (b), one end of the conductor stripe 79 is screwed to the upper frame 1 and the other end is elastically contacted with the ground pad 24 of the drive circuit board 35 to ground the drive circuit board 35.

Then, in (c), the tongue piece 81 connected to the upper frame 1 is soldered to the ground pad 24 of the drive circuit board 35 to ground the drive circuit board 35. However, the grounding means (a) described above complicates press molding of the upper frame 1 because the claw 77 is provided on the upper frame 1, and the elastic spacer 78 is provided, so that the conductive connection between the ground pad 24 and the claw 77 is provided. Is incomplete.

Further, the grounding means of (b) involves a plurality of fixing means such as soldering and screwing, so that there is a problem that the work becomes complicated. The grounding means of (c) requires a troublesome work of soldering the iron-based tongue piece 81 connected to the upper frame 1 to the ground pad 24, and there is a problem that the work efficiency is not good like the above. .

All of the above means are difficult to assemble and the drive circuit board is difficult to remove. SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device which solves the above-mentioned problems of the prior art and ensures reliable grounding of a drive circuit board and facilitates its removal.

[0011]

In order to achieve the above object, an upper frame 1 having a display window 3 and a drive circuit board 35.
A liquid crystal display panel 62 including a liquid crystal plate in which
Light guide assembly 3 including a light diffusion plate, a light guide plate, and a reflection plate
7, a frame-shaped intermediate frame 42 in which the light guide assembly 37 is housed in an inner frame, and a linear backlight light source 36 is mounted on at least one side, and a lower frame 2 are stacked in this order, and In the liquid crystal display device in which the frame 1 and the lower frame 2 are connected and fixed, at least the ground pad 24 formed on the surface of the drive circuit board 35 opposite to the upper frame 1 and the drive circuit board 35. A conductive clip 76 for elastically sandwiching a part of the upper frame 1 which is in contact with the surface on the opposite side of the ground pad 24, and secures the grounding of the drive circuit board 35, and also the frame. And the drive circuit board can be released freely.

[0012]

In the above structure, since the conductive clip 76 having elasticity is sandwiched between a part of the upper frame 1 and the ground pad 24 of the driving circuit board 35, the upper frame 1 and the driving circuit board 35 are surely grounded. In addition, since the clip 76 is easily attached and detached, the assembly and the removal are extremely easy.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a developed perspective view for explaining the configuration of a liquid crystal display device according to the present invention, in which 1 is an upper frame,
Reference numeral 18 denotes a protrusion formed by press molding on the short side of the upper frame so as to protrude toward the liquid crystal display panel, 3 denotes a liquid crystal display window, and 6
Reference numeral 2 is a liquid crystal display panel, 35 is a drive circuit board, 14 is a stripe-shaped spacer interposed between the upper frame and the liquid crystal display panel 62, and 13 is an optical element inserted between the liquid crystal display panel and the frame-shaped intermediate frame. A frame-shaped spacer that seals the periphery of a light guide assembly 37 including a diffusion plate, a light guide plate, and a reflection plate, 42 is a frame-shaped intermediate frame made of a resin material on which a linear Bakulite light source is mounted, and 36 is a cold cathode tube. Is a backlight light source (lamp), 17 is a backlight light source cover (lamp cover), 65 is a tape carrier pad for connecting the terminals of the liquid crystal display panel and the terminals of the drive circuit board, 76 is a conductive clip, and 20 is Claws, 25 are claw receivers formed on the lower frame, and 2 is a lower frame.

In FIG. 1, the liquid crystal display device is sandwiched and fixed by an upper frame 1 and a lower frame 2 in the order shown. A linear light source (backlight light source) 36 including a cold cathode tube is installed at one end of the intermediate frame 42, and the lamp cover 1
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 side including the light diffusion plate, the light guide plate, and the reflection plate.

The frame-shaped spacer 13 is interposed between the light guide assembly 37 housed in the inner frame formed in the intermediate frame 42 and the liquid crystal display panel 62 to fix the display area and to control the backlight source 36. Prevent light from leaking out of the light guide assembly. Then, after mounting the backlight light source 36 on one side of the intermediate frame 42, the backlight light source cover 17 is fitted and fixed.

The protruding portion 18 formed on the short side of the upper frame 1 is a driving circuit board 3 which constitutes a liquid crystal display panel 62.
A plurality of them are provided at positions facing the ground pads 24 formed on the No. 5, and the above-mentioned 18 is arranged so as to press the above-mentioned 24 when the whole is assembled. A conductive clip 76 for elastically sandwiching and setting the upper frame 1 and the liquid crystal display panel 62 is attached to a recess formed as a part 75 of the upper frame.

FIG. 2 is a schematic cross-sectional view of the main part of FIG. 1 for explaining the structure of the main part of one embodiment of the liquid crystal display device according to the present invention.
The detailed structure is omitted in FIG. As shown in FIG. 2, on the drive circuit board 35 that constitutes the liquid crystal display panel 62, ground pads 24-A and 24-B are provided at positions corresponding to the recesses formed as the part 75 of the upper frame.
Are formed.

A part 75 of the upper frame is brought into contact with the ground pad 24-A, and clamped together with the drive circuit board 35 by a clip 76. The clip 76 contacts the ground pad 24-B of the drive circuit board 35. With this configuration, the drive circuit board 35 is reliably grounded to the upper frame 1. Further, with the above configuration, the drive circuit board 35 can be removed only by removing the clip 76.

The ground pad formed on the drive circuit board 35 may be only one of 24-A and 24-B. Further, the protrusion 18 formed on the upper frame 1 may be omitted, and the protrusion may be in contact with the insulating portion of the drive circuit board 35 so as to maintain a predetermined distance therebetween.

As a result, it is possible to provide a liquid crystal display device in which the liquid crystal display device can be made thinner, and the drive circuit board can be reliably grounded and easily removed. Hereinafter, a specific example in which the above configuration is applied to a liquid crystal display device of a super twisted nematic (STN) system will be described. In the drawings that follow, those having the same function are designated by the same reference numerals,
The repeated description will be omitted. “Specific Example 1” FIG. 3 shows an arrangement direction of liquid crystal molecules (for example, a rubbing direction), a twisting direction of liquid crystal molecules, a polarization axis (or an absorption axis) direction of a polarizing plate when the liquid crystal display device 62 according to the present invention is viewed from above. And the optical axis direction of the member that brings about the birefringence effect. FIG. 4 shows the liquid crystal display device 6 according to the present invention.
The principal part 2 perspective view is shown.

Twisting direction 10 of liquid crystal molecules and twist angle θ
Is the rubbing direction 6 of the alignment film 21 on the upper electrode substrate 11, 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 optically active substance added. In FIG. 4, in order to align the liquid crystal molecules between the two upper and lower electrode substrates 11 and 12 sandwiching the liquid crystal layer 50 so as to form a twisted spiral structure, A so-called rubbing method, which is a method of rubbing the surfaces of the alignment films 21 and 22 made of an organic polymer resin made of polyimide in contact with the liquid crystal with a cloth, for example, in one direction, is adopted. The rubbing direction at this time, that is, the rubbing direction, the rubbing direction on the upper electrode substrate 11 and the rubbing direction 7 on the lower electrode substrate 12 are the alignment directions of the liquid crystal molecules.

On the two sheets thus oriented,
The lower electrode substrates 11 and 12 are respectively rubbed in directions 6 and 7
Are opposed to each other with a gap d ₁ so that they cross each other at about 180 to 360 degrees.
Is bonded by a frame-shaped sealing material 52 having a notch 51 for injecting liquid crystal, and a nematic liquid crystal having a positive dielectric anisotropy and a predetermined amount of an optical rotatory substance added is sealed in the gap, whereby liquid crystal molecules are Is the twist angle θ between the electrode substrates in the figure.
The molecular arrangement has a helical structure. In addition, 31 and 32 are 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 constructed, and the member 40 and the liquid crystal. Upper and lower polarizing plates 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 200 degrees to 300 degrees, but excellent time division characteristics are avoided by avoiding the phenomenon that the lighting state near the threshold value of the transmittance-applied voltage curve is an orientation that scatters light. From the practical viewpoint of maintaining the above condition, 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 realize an excellent time division characteristic. 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 0.6 μm to 0.9 μm.

The birefringent member 40 acts so as to modulate the polarization state of light passing through the liquid crystal cell 60, and converts a display which is colored only by the liquid crystal cell 60 into a 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 0.5 μm to 0.7 μm.

Further, since the liquid crystal display device 62 according to the present invention uses the elliptically polarized light due to the birefringence, the polarizing plate 15,
When the uniaxial transparent birefringent plate is used as the birefringent member 40, the relationship between the 16 axes 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. . Here, the effect of the above relationship will be described with reference to FIG. The figure shows the relationship between the axis of the polarizing plate, the optical axis of the uniaxial transparent birefringent member, and the liquid crystal alignment 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 upper electrode substrate 11 adjacent thereto, and 7 is the liquid crystal alignment of the lower electrode substrate 12. Direction 8 is the absorption axis or 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 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 is the absorption axis or polarization axis 9 of the lower polarizing plate 16 and the lower electrode substrate 1.
2 is the angle formed by the liquid crystal alignment direction 7.

Here, a method of measuring the angles α, β and γ will be defined. In FIG. 8, 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 will be described as an example. The intersection angle between the optical axis 5 and the liquid crystal alignment direction 6 can be represented by φ ₁ and φ ₂ as shown in FIG. 9, but the smaller angle of φ ₁ and φ ₂ is adopted here. That is, since φ ₁ <φ ₂ in FIG.
₁ is the angle of intersection between the optical axis 5 and the liquid crystal alignment direction 6, and since φ ₁ > φ ₂ in FIG. 8B, φ ₂ is the angle of intersection between the optical axis 5 and the liquid crystal alignment direction 6. Of course, either _one may be adopted when φ ₁ = φ ₂ .

In this type of liquid crystal display device, the angles α, β and γ are extremely important. The angle α is preferably 5
0 to 90 degrees, more preferably 70 to 90 degrees,
The angle β is preferably 20 to 70 degrees, more preferably 30 to 60 degrees, and the angle γ is preferably 0 to 70 degrees.
It is desirable to set the angle to 0 degree, more preferably to 0 degree to 50 degree.

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 above angle α is set regardless of whether the twist direction 10 is clockwise or counterclockwise. , Β, γ may be within the above range. In FIG. 4, the birefringent member 40 is arranged between the upper polarizing plate 15 and the upper electrode substrate 11, but instead, it is arranged between the lower electrode substrate 12 and the lower polarizing plate 16. Good. 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 molecule is 2
A liquid crystal cell having a parallel orientation (homogeneous orientation), that is, a twist angle of 0 degree was used as the uniaxial transparent birefringent member 40.

Here, the ratio d / p between the thickness d (μm) of the liquid crystal layer and the helical pitch p (μm) of the liquid crystal material added with the optical rotatory substance was set to about 0.53. The alignment films 21 and 22 were formed of a polyimide resin film and used after being rubbed. The tilt angle (pretilt angle) at which the alignment film subjected to the rubbing process causes the liquid crystal molecules in contact with the alignment film to be tilted with respect to the substrate surface is about 4 degrees. Δn ₂ · d ₂ of the uniaxial transparent birefringent member 40 is about 0.6 μm.
On the other hand, Δn ₁ · d ₁ of the liquid crystal layer 50 in which the liquid crystal molecules are twisted by 240 degrees is 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 increased. It was possible to realize light non-transmission, that is, black display when the voltage was below the threshold, and light transmission, that is, white and black display when the voltage was above a certain threshold. Further, when the axis of the lower polarizing plate 16 is rotated from the above position by 50 to 90 degrees, when the voltage applied to the liquid crystal layer 50 is below the threshold value, it is white, and when the voltage is above the threshold value, it is black. 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. Although the contrast was extremely high when the angle α was in the vicinity of 90 degrees, the contrast decreased as the angle deviated. Moreover, when the angle α becomes small, both the lit part and the non-lit part become bluish, and when the angle α becomes large, the non-lit part becomes purple and the lit part becomes yellow, and in any case black and white display is impossible. Similar results are obtained for the angle β and the angle γ, but in the case of the angle γ, when the image is rotated from 50 degrees to 90 degrees, the opposite black and white display is performed. The basic structure of "Specific Example 3" is the same as that of "Specific Example 2". However, the twist angle of the liquid crystal molecules of the liquid crystal layer 50 is 260
The difference is that Δn ₁ · d ₁ is about 0.65 μm to 0.75 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 black and white display similar to the "concrete example 1" can be realized. Also, the reverse black-and-white display is possible by rotating the position of the axis of the lower polarizing plate from the above value by 50 to 90 degrees, which is also the same as "Specific example 2". The inclinations of the angles α, β, and γ with respect to the shift are almost the same as in “Specific Example 2”.

In each of the specific examples described above, a parallel alignment liquid crystal cell having no twist of liquid crystal molecules is used as the uniaxial transparent birefringent member 40, but a liquid crystal layer in which liquid crystal molecules are twisted by about 20 to 60 degrees is used. When used, the color changes less depending on the angle. This twisted liquid crystal layer is the liquid crystal layer 5 described above.
Like 0, it is formed by sandwiching a liquid crystal between a pair of transparent substrates that have been subjected to the alignment treatment so that the alignment treatment directions intersect a predetermined twist angle. In this case, the bisected angle of the two alignment treatment directions sandwiching the twisted structure of the liquid crystal molecules may be treated as the optical axis of the birefringent member.

A transparent polymer film may be used as the birefringent member 40 (in this case, a uniaxially stretched film is preferable). In this case, as the polymer film, PET
(Polyethylene terephthalate), acrylic resin, and polycarbonate are effective. Further, in the above specific example, the single birefringent member was used, but in FIG.
In addition to the birefringent member 40, the lower electrode substrate 12 and the lower polarizing plate 1
It is also possible to insert another birefringent member between 6 and 6. In this case, Δn ₂ · d ₂ of these birefringent members may be readjusted. "Specific example 4" The basic structure is the same as that of "specific example 2." However, as shown in FIG. 9, red, green,
Multicolor display is possible by providing the light shielding film 33D between the blue color filters 33R, 22G, 33B and the filters. FIG. 7 shows the relationship among the alignment direction of liquid crystal molecules, the twisting direction of 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 smoothing layer 23 made of an insulating material is formed on each of the color filters 33R, 22G, 33B and the light shielding film 33D to reduce the influence of these irregularities. The upper electrode 31 and the 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 portion of a laptop personal computer, and FIG. 11 shows a state in which the laptop personal computer 64 is mounted.

In FIG. 10, the microprocessor 49
The liquid crystal display module is driven by the drive IC 34 via the control LSI 48 based on the result calculated in (4). The invention described in the claims of the present invention is not limited to the above-mentioned STN type liquid crystal display device, but is similarly applicable to other type liquid crystal display devices equipped with a backlight.

According to this embodiment constructed as described above, the drive circuit board can be surely grounded, and the removal thereof becomes easy. 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 type liquid crystal display devices.

[0040]

As described above, according to the present invention,
Since a conductive clip having elasticity is sandwiched between a part of the upper frame and the ground pad of the drive circuit board, grounding of the upper frame and the drive circuit board is surely achieved, and the clip is easily attached and detached. In addition, it is possible to provide a liquid crystal display device that is extremely easy to assemble and remove and can be made thin.

[Brief description of drawings]

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

FIG. 2 is a schematic cross-sectional view illustrating the structure of a main part of one embodiment of the liquid crystal display device according to the present invention.

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

FIG. 4 is a perspective view of a main part for explaining a stacking relationship of constituent materials of the liquid crystal display device according to the present invention.

FIG. 5 is an explanatory diagram showing a relationship among an alignment direction of liquid crystal molecules, a twisting direction of liquid crystal molecules, a direction of an axis of a polarizing plate, and an optical axis of a birefringent member in 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-crossing angle α characteristics in Example 1 of the liquid crystal display device according to the present invention.

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

FIG. 8 shows an intersection angle α, in the liquid crystal display device according to the present invention.
It is an explanatory view of how to measure β and γ.

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

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

FIG. 12 is a cross-sectional view of essential parts for explaining a typical example of the grounding configuration of a drive circuit board that constitutes a liquid crystal display panel according to the related art.

[Explanation of symbols]

1 Upper Frame 2 Lower Frame 3 Liquid Crystal Display Window 13 Spacer 14 Adhesive Tape for Fixing Upper Frame and Liquid Crystal Display Panel 17 Lamp Cover 18 Cut and Raised Piece (Protrusion) Soldered to Ground Pad Formed on Driving Circuit Board 20 Claws fixed to claw receivers formed on the lower frame 35 Drive circuit board 36 Backlight light source (lamp) consisting of cold cathode tubes 37 Light guide assembly consisting of light diffusing plate, light guide plate and reflecting plate 42 Linear bakulite is mounted Intermediate frame 62 Liquid crystal display panel 65 Tape carrier package 75 Recessed portion 76 Conductive clip.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Umeyama 3300 Hayano, Mobara-shi, Chiba Electronic device division, Hitachi, Ltd. (72) Inventor Shigeharu Hatayama 3300 Hayano, Mobara, Chiba Hitachi, Ltd. (72) Inventor Yuuo Nozawa 3300 Hayano, Mobara-shi, Chiba Hitachi, Ltd. Electronic Device Division

Claims (1)

[Claims] 1. A liquid crystal display panel including an upper frame having a display window, a liquid crystal plate integrated with a drive circuit board, a light guide assembly including a light diffusing plate, a light guide plate, and a reflecting plate. The optical frame assembly is housed in an inner frame and a frame-shaped intermediate frame having a linear backlight light source mounted on at least one side and a lower frame are laminated in this order, and the upper frame and the lower frame are connected and fixed. A liquid crystal display device comprising: a ground pad formed on at least a surface of the drive circuit board opposite to the upper frame; and the upper frame contacting a surface of the drive circuit board opposite to the ground pad. And a conductive clip that elastically clamps a part of the drive circuit board to secure the grounding of the drive circuit board and to release the frame and the drive circuit board freely. Liquid crystal display device.