JP2000047209A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a yield by the ease of assembly in picture frame narrowing, the reduction of the spaces for arrangement of parts and the avoidance of the external damage of the parts in assembly work. SOLUTION: This liquid crystal display device is held and fixed by an upper case SHD which has a liquid crystal display element and an illumination light source having a light transmission body, a wire-shaped light source arranged in proximity along at least one end face of this light transmission body and a reflection sheet installed on the surface of the light transmission body on the side opposite to the liquid crystal display element, is formed with a window in the effective display region of the liquid crystal display element and is formed with threaded holes HLD in the corner parts on at least one side edge and a lower case MCA which is formed with a recess for holding the illumination light source. The threaded holes HLD of the upper case SHD are formed at the difference-in-level surface SHDP successively connected by a side wall SHDS where the threaded holes HLD of the upper case SHD drop the outer edge of the picture frame of the upper case to the lower case MCA side. Notches CUTF are formed in the positions in contact with the heads SCH of the headed screws SC of the successive connection parts of the difference-in-level surface SHDP and the side wall SHDS.

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, and more particularly to a liquid crystal display device in which the ease of assembling in a narrow frame, the space for arranging parts are reduced, and the damage to parts in assembling work is avoided to improve the yield. The present invention relates to a liquid crystal display device having the same.

[0002]

2. Description of the Related Art A liquid crystal display device has been widely used as a display device capable of high-definition and color display for a notebook computer or a display monitor.

[0003] The liquid crystal display device includes a simple matrix type using a liquid crystal panel in which a liquid crystal layer is sandwiched between a pair of substrates on which parallel electrodes formed so as to cross each other are formed on each inner surface;
2. Description of the Related Art An active matrix liquid crystal display device using a liquid crystal panel having a switching element for selecting a pixel in one of a pair of substrates is known.

An active matrix type liquid crystal display device is
A so-called vertical electric field type liquid crystal display device (generally, a TN type active matrix type) using a liquid crystal panel in which an electrode group for pixel selection is formed on a pair of upper and lower substrates as represented by a twisted nematic (TN) type. A liquid crystal panel in which an electrode group for pixel selection is formed only on one of a pair of upper and lower substrates,
There is a so-called in-plane switching mode liquid crystal display device (generally referred to as an IPS mode liquid crystal display device).

In the liquid crystal panel constituting the former TN mode active matrix type liquid crystal display device, the liquid crystal is twisted by 90 ° in a pair (two) of substrates, and is absorbed on the outer surfaces of the upper and lower substrates of the liquid crystal panel. Two polarizing plates are laminated with the axial direction arranged in crossed Nicols and the absorption axis on the incident side made parallel or perpendicular to the rubbing direction.

In such a TN type active matrix type liquid crystal display device, when no voltage is applied, the incident light becomes linearly polarized light on the incident side polarizing plate, and this linearly polarized light propagates along the twist of the liquid crystal layer, and the outgoing side polarized light. When the transmission axis of the plate coincides with the azimuthal angle of the linearly polarized light, all the linearly polarized light is emitted and white display is performed (a so-called normally open mode).

When a voltage is applied, the direction (director) of a unit vector indicating the average alignment direction of the liquid crystal molecular axes constituting the liquid crystal layer is oriented in a direction perpendicular to the substrate surface, and the azimuth of the incident side linearly polarized light. Since the angle does not change, it coincides with the absorption axis of the exit-side polarizing plate, so that black display is performed. (See "Basics and Applications of Liquid Crystals" published by the Industrial Research Council in 1991).

On the other hand, an electrode group for pixel selection and an electrode wiring group are formed only on one of a pair of substrates, and a voltage is applied between adjacent electrodes (between a pixel electrode and a counter electrode) on the substrate by applying a voltage. In an IPS type liquid crystal display device in which layers are switched in a direction parallel to the substrate surface, a polarizing plate is arranged so as to display black when no voltage is applied (a so-called normally closed mode).

The liquid crystal layer of this IPS mode liquid crystal display device is
In the initial state, the director of the liquid crystal layer is in a homogeneous orientation parallel to the substrate surface, and in a plane parallel to the substrate, the director of the liquid crystal layer is parallel or somewhat angled with the electrode wiring direction when no voltage is applied, and the liquid crystal layer is oriented when the voltage is applied. The direction of the director shifts in a direction perpendicular to the electrode wiring direction with the application of the voltage, and the director direction of the liquid crystal layer is 45 times smaller than the director direction when no voltage is applied.
° When tilted in the electrode wiring direction, the liquid crystal layer at the time of applying the voltage has an azimuth of 90 degrees of polarization as if it were a half-wave plate.
And the azimuth of the polarized light coincides with the transmission axis of the exit-side polarizing plate, and a white display is obtained.

This IPS mode liquid crystal display device has a feature that a change in hue and contrast is small even at a viewing angle and a wide viewing angle is achieved (Japanese Patent Laid-Open No. 5-505).
247).

In the above-mentioned full-color liquid crystal display devices, a color filter system is mainly used. In this method, a pixel corresponding to one dot of color display is divided into three, and a color filter corresponding to each of three primary colors, for example, red (R), green (G), and blue (B) is arranged in each unit pixel. This is achieved by doing so.

The present invention can be applied to the above-mentioned various liquid crystal display devices. The outline of the present invention will be described below by taking a TN type active matrix type liquid crystal display device as an example.

As described above, in a liquid crystal display element (also referred to as a liquid crystal panel) constituting a TN type active matrix type liquid crystal display device (for simplicity, hereinafter simply referred to as an active matrix type liquid crystal display device), a liquid crystal layer is formed. A gate line group extending in the x-direction and juxtaposed in the y-direction on a surface of one of two transparent insulating substrates made of glass or the like which face each other via a liquid crystal layer; A drain line group extending in the y direction while being insulated from the line group and arranged in parallel in the x direction is formed.

Each region surrounded by the group of gate lines and the group of drain lines becomes a pixel region, and a switching element such as a thin film transistor (T
FT) and a transparent pixel electrode.

When the scanning signal is supplied to the gate line, the thin film transistor is turned on, and a video signal from the drain line is supplied to the pixel electrode via the turned on thin film transistor.

It is to be noted that, in addition to the drain lines of the drain line group, the gate lines of the gate line group extend to the periphery of the substrate to form external terminals, and are connected to the external terminals. Video driving circuit, gate scanning driving circuit, that is, a plurality of driving ICs constituting them
(Semiconductor integrated circuit) is externally mounted around the substrate. In other words, a plurality of tape carrier packages (TCP) on which these drive ICs are mounted are externally provided around the substrate.

However, since such a substrate has a structure in which a TCP on which a driving IC is mounted is externally mounted, an intersecting region of a gate line group and a drain line group of the substrate is formed. The area occupied by the area between the outline of the display area and the outer frame of the substrate (usually called a frame) becomes large, and the liquid crystal display element is integrated with the illumination light source (backlight) and other optical elements. This is contrary to the desire to reduce the external dimensions of the liquid crystal display module.

Therefore, in order to solve such a problem as much as possible, that is, due to demands for high-density mounting of the liquid crystal display element and miniaturization of the outer shape of the liquid crystal display module, the video drive is performed without using TCP parts. The so-called flip-chip method or chip-on-glass (COG) method in which a scanning IC and a scanning drive IC are directly mounted on a substrate has been proposed.

The flip-chip type liquid crystal display device is disclosed in Japanese Patent Application No. 6-256426 filed by the same applicant.
There is a number.

[0020]

A liquid crystal display device of this type is, for example, a substrate made of two sheets of glass or the like at a predetermined gap so that the surfaces on which a transparent electrode for display and an alignment film are laminated face each other. Are superimposed, and the two substrates are bonded together with a sealing material provided in a frame shape (a square shape) in the vicinity of the peripheral portion between the two substrates, and the liquid crystal sealing opening, which is a cutout provided in a part of the sealing material, A liquid crystal display element (referred to as a liquid crystal display panel, a liquid crystal panel, etc.) in which a liquid crystal is injected and sealed inside a sealing material between the two substrates, and a polarizing plate is further provided outside the two substrates, A backlight disposed on the back of the element to supply light to the liquid crystal display element; a liquid crystal drive circuit board disposed outside the outer periphery of the liquid crystal display element; and a molded article for housing and holding the backlight. Lower case and each of the above Wood and the storage, metal shield case having a display window (upper case, also referred to as an upper frame)
And so on.

The backlight is, for example, a synthetic resin plate such as a transparent acrylic plate for guiding light emitted from a light source to a direction away from the light source and uniformly irradiating the entire surface of the liquid crystal display element with light. A linear light source (a fluorescent tube such as a cold cathode fluorescent lamp) arranged parallel to and along the end face near at least one end face (one side face) of the light guide body. A fluorescent tube is covered over substantially the entire length thereof, and a cross-sectional shape is substantially U-shaped, and a light source reflector whose inner surface is a reflection surface is disposed on a light guide, for example,
The upper surface is a prism surface formed by arranging a large number of triangular prisms in parallel, the lower surface is formed of a smooth surface, and the light of the backlight emitted over a wide angle range is aligned in a certain angle range, and the light guide is formed. A diffusion sheet for diffusing light from
It is composed of a prism sheet for improving the brightness of the backlight, a reflection sheet disposed below the light guide, and reflecting light from the light guide to the liquid crystal display element to the side.

In such a liquid crystal display device, with the recent narrowing of the frame, it has become difficult to secure a space for a mounting portion for mounting equipment such as a personal computer.

FIGS. 48A and 48B are explanatory views of a configuration example of a mounting portion of the liquid crystal display device. FIG. 48A is a plan view of a main part, and FIG. 48B is a cross-sectional view taken along line AA of FIG. . SHD is an upper case, MCA is a lower case, BOSS is a mounting boss formed on the mounting device side, SC is a headed screw, SCH is a screw head, SHDF is a side wall, and SHDP is a step surface.

A headed screw for mounting to a mounting device is a stepped surface SHDP in which the outer edges of the corners of the upper case SHD are connected by a side wall SHDF which is lowered toward the lower case MCA.
Is screwed into the mounting portion BOSS of the mounting device through the screw hole HLD formed in the above and the screw receiving hole MH of the lower case MCA.

The width of the upper case SHD has been reduced due to the narrowing of the frame, and it has become difficult to secure a sufficient installation space for the headed screws for the width of the stepped surface SHDP. As shown in FIG. 48, the screw head SCH of the head screw SC used for mounting the liquid crystal display device is in contact with the side wall SHDF and cannot fit in the space of the step surface DHDP. Therefore, it was considered to remove the side wall SHDF,
There has been a problem that the mechanical strength of the step surface DHDP is reduced and mounting of the liquid crystal display device becomes uncertain.

A plurality of printed circuit boards such as a hard printed circuit board or a flexible printed circuit board on which a drive circuit is mounted are provided around the periphery of the liquid crystal display element constituting the liquid crystal display device. The connection is
This is performed via a so-called inter-board connector.

FIGS. 49A and 49B are explanatory diagrams of an inter-board connector for connecting printed circuit boards, wherein FIG. 49A is a plan view of the female connector CT2, and FIG. 49A is along the line BB in FIG. Sectional view, (b) is a plan view of the male connector T4,
(B ') is a cross-sectional view taken along line CC of (b), (c) is a rear view for explaining dimensions of the board-to-board connector, and (c') is a side view of (c) viewed from the D direction. It is.

As shown in (a) and (a '), the female connector CT2 has a contact terminal CTCT provided inside the recess of the housing CTHS.
Connection terminals CTL (1-n) connected to the housing C
The connection CTT protrudes outward from the side wall on the bottom side of the THS.
L is welded to the wiring pattern formed on the printed circuit board.

As shown in (b) and (b '), in the male connector CT4, the contact terminal CTCT is provided on the outer periphery of a convex portion which fits into the concave portion of the female connector CT2 on the upper surface of the housing CTHS. The connection terminals CTTL (1-n) connected to the contact terminals CTCT are connected to the housing CTH.
The connection CTL protrudes outward from the side wall on the S bottom surface side and is welded to a wiring pattern formed on a printed circuit board.

In (c) and (c ′), the width of the housing CTHS is W ₁ , and the connection terminals CT provided on both sides thereof are provided.
The width between the tips of the TL is W ₂ , and the pitch of the connection terminal CTTL is P ₂ .

As the frame of the liquid crystal display device becomes narrower, the width of the printed circuit board must be reduced. Accordingly, the space for mounting components on the printed circuit board is reduced, and the space for mounting these inter-board connectors is also limited. Since the connector itself has a limit in miniaturization, mounting becomes difficult.

By the way, in the upper frame formed by pressing a metal plate, burrs are usually left on the edges which are the shearing surfaces. When assembling the liquid crystal display device, the burrs come into contact with the flexible printed circuit board constituting the liquid crystal display element, thereby breaking the insulating film or damaging the wiring, thereby causing a defect.

FIG. 50 is an explanatory view of the assembling work of the liquid crystal display device. The backlight BL mounted on the lower flexible MCA which is a plastic mold is laminated on the back surface of the liquid crystal display element PNL, and the upper frame SHD is covered. Then, the cut-and-raised portion formed on the peripheral edge of the upper frame SHD is engaged with and fixed to the lower frame MCA.

At this time, if the burrs E remaining on the edge of the upper frame SHD come into contact with the flexible printed circuit board FPC, the flexible printed circuit board will be damaged, causing disconnection and the like. Also, contact with other portions of the liquid crystal display element PNL causes undesired damage.

An object of the present invention is to provide a liquid crystal display device having a structure in which the ease of assembly in narrowing the frame, the space for arranging parts is reduced, and the parts are prevented from being damaged during the assembling work, thereby improving the yield. is there.

[0036]

Means for Solving the Problems In order to achieve the above object, the present invention is characterized in that the present invention has the following constitutions (1) to (4).

(1) A liquid crystal display element, a light guide, a linear light source disposed at least along one end face of the light guide, and a surface of the light guide opposite to the liquid crystal display element. An upper case in which a window is formed in an effective display area of the liquid crystal display element and a screw hole is formed in at least one corner of a side edge, and the illumination light source is held. The upper case is screwed and fixed with a lower case having a recess formed therein, and a screw hole of the upper case is formed on a step surface in which an outer edge of a frame of the upper case is connected with a side wall dropped into the lower case, A notch was formed at a portion of the joint between the step surface and the side wall where the head of the headed screw hits.

With this configuration, even if the mounting space for the screws for mounting the upper frame to the electronic device is reduced due to the narrowing of the frame, the strength of the step formed on the outer edge of the upper frame for mounting the screws is not reduced. The liquid crystal display device can be reliably mounted on the electronic device.

(2) The printed circuit boards are electrically connected by board-to-board connectors attached to at least two peripheral edges of the liquid crystal panel and mounted on a printed circuit board on which a drive circuit for driving the liquid crystal panel is mounted, The inter-board connector is a housing formed of an insulating material, a plurality of contact terminals exposed on an upper surface of the housing, and implanted outward from a side wall of the housing in connection with each of the contact terminals, And a plurality of connection terminals which are partially or wholly folded back on the bottom side of the housing and welded to the printed circuit board.

With this configuration, the mounting area of the inter-board connector can be reduced, and the frame of the liquid crystal display device can be easily narrowed.

(3) The plurality of connection terminals in (2) are folded back to the bottom side of the housing every other one.

With this configuration, the pitch between terminals can be reduced, the size of the connection terminal installation side of the inter-board connector can be reduced, and the mounting efficiency of the printed circuit board can be improved.

(4) A liquid crystal display element, a light guide, a linear light source disposed at least along one end face of the light guide, and a surface of the light guide opposite to the liquid crystal display element. An illumination light source having a reflection sheet installed in the upper case having a bent side bent to the lower case side while forming a window in the effective display area of the liquid crystal display element,
The liquid crystal display element and the illumination light source are sandwiched and fixed by engaging the periphery of the lower case with the bent side of the upper case,
The edge of the bent side of the periphery of the upper case was subjected to a burr crushing process.

With this configuration, it is possible to prevent the flexible printed circuit board and other parts from being damaged at the time of assembling the liquid crystal display device, and it is possible to prevent undesired damage such as disconnection from occurring.

It should be noted that the present invention is not limited to the above configuration, and various changes can be made without departing from the technical idea of the present invention.

[0046]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view of a first embodiment of the liquid crystal display device according to the present invention, wherein SHD is an upper frame formed by pressing a metal plate, SHDP is a stepped surface, and SHDS is
Is a side wall, HLD is a screw hole formed on the step surface, SC is a headed screw, SCH is a screw head, and cutoff is a cutout.

FIG. 2 is a side view of a main part viewed from the direction of arrow F in FIG. 1. In FIG. 2, MCA is a lower frame made of a plastic mold, BOSS is a boss for mounting a liquid crystal display device of a mounting device, Corresponds to the same part.

FIG. 3 is a sectional view of a main part of FIG. 1 for further schematically explaining the structure of the first embodiment of the present invention.
1A is a cross-sectional view taken along line GG of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along line HH of FIG.

In this embodiment, the liquid crystal display device has attachment portions at four corners, and as shown in FIG. 1, the outer edges of the frame of the upper frame are connected to each other by the side wall SHDS lowered into the lower case. Screw hole HLD formed in step surface SHDP
Then, the headed screw SC is screwed into the mounting boss BOSS of the mounting device and fixed through the screw receiving hole MH formed in the lower frame MCA.

A cutout CUT is formed at a portion of the side wall SHDS connected to the step surface SHDP, where the head of the headed screw SC contacts.
F is formed, and the screw head SCH of the headed screw SC fits into the cutout CFTF so that the narrow step surface SHD is formed.
Even with P, a headed screw having sufficient strength can be used. Further, since the notch CUTF may be large enough to receive the screw head SCH of the head screw SC, the step surface SHDP
Without impairing the mechanical strength.

According to this embodiment, the strength of the step surface formed on the outer edge of the upper frame to which the screws are attached can be reduced even if the space for installing the screws for mounting the upper frame to the electronic device is reduced due to the narrowing of the frame. Therefore, the liquid crystal display device can be securely mounted on the electronic device.

FIG. 4 is an explanatory view of a first example of an inter-board connector for explaining a second embodiment of the liquid crystal display device of the present invention.
(A) is a rear view, and (b) is a side view as viewed from the direction of arrow I in (a).

The board-to-board connector CT has connection terminals CT
The TL is folded back on the back surface of the housing CTHS, and the folded connection terminal CTTL is welded to the wiring of the printed circuit board. Each size of the substrate between the connector CT is similar to the connector between a conventional substrate described in FIG. 49, the aspect of housing CTHS is L _1, W _1,
Pitch of the connection terminals CTTL (1 to n) is P _1. However, since the connection terminal CTTL is folded back on the rear surface of the housing CTHS, the width between the terminals is substantially equal to the housing CTHS.
Equal to the width W ₁ of the HS.

Thus, the mounting area of the board-to-board connector CT can be reduced, and the frame of the liquid crystal display device can be easily narrowed.

FIG. 5 is an explanatory view of a second example of an inter-board connector for explaining a second embodiment of the liquid crystal display device of the present invention.
(A) is a rear view, and (b) is a side view as viewed from the direction of arrow I in (a).

This inter-board connector CT has the connection terminals CTTL (1 to n) alternately folded on the back surface of the housing CTHS, and the folded connection terminals CTT.
The connection terminal CTL which does not turn back with L is welded to the wiring of the printed circuit board. This board-to-board connector CT
As in the case of the conventional board-to-board connector described with reference to FIG. 49, the side of the housing CTHS is W ₁ , and the size between the ends of the connection terminals is W _2.
Place By folded to the rear surface of the housing CTHS to One, the pitch of the connection terminals CTTL (1 to n) may be a narrower P ₂ from the P _1, vertical size L ₂
Can is made smaller than L ₁ of the. This also makes it possible to reduce the mounting area of the board-to-board connector CT, and to facilitate a narrow frame of the liquid crystal display device.

FIG. 6 is an exploded cross-sectional view of a liquid crystal display device according to a third embodiment of the present invention, in which the same reference numerals as those in FIG. 50 correspond to the same functional portions. When assembling the liquid crystal display device, the backlight BL mounted on the lower flexible MCA, which is a plastic mold, is laminated on the back surface of the liquid crystal display element PNL, the upper frame SHD is covered, and the cut and raised formed on the periphery of the upper frame SHD is formed. It is engaged with and fixed to the lower frame MCA.

In this embodiment, the edge of the upper frame SHD is subjected to the burr crushing process K. Therefore, when the upper frame SHD is put on the liquid crystal display element PNL, even if the edge of the upper frame SHD and the flexible printed circuit board FPC come into contact with each other, the flexible printed circuit board is not damaged and the disconnection or the like is caused. Can be prevented.
Also, even if it touches another part of the liquid crystal display element PNL, it does not cause undesired damage.

According to each of the embodiments described above, the problems in the prior art caused by the narrowing of the frame are solved, and a liquid crystal display device having high quality and high reliability can be provided.

Next, the specific contents of the overall example of the liquid crystal display device to which the above embodiments are applied will be described in detail. In the drawings described below, components having the same functions are denoted by the same reference numerals, and the description thereof will not be repeated.

FIGS. 7 and 8 are exploded perspective views for explaining an entire configuration example of the liquid crystal display device according to the present invention, and FIG. 7 covers the liquid crystal display element with an upper case constituting the housing of the liquid crystal display device. FIG. 8 is an exploded perspective view showing the previous state, and FIG. 8 is a plan view of FIG. 7 in which an illumination light source (backlight) and various optical films laminated on the upper case and the lower surface of the liquid crystal display element shown in FIG. FIG. 7 is an exploded perspective view showing a state before being fixed to the upper case.

7 and 8, SHD is an upper case (shield case), PNL is a liquid crystal display element, SPC
(SPC1 to SPC2) are insulating spacers, SCP-P is a protrusion of the spacer SPC (fitted into an opening formed in the upper case SHD), BAT is a double-sided adhesive tape, FPC1,
FPC2 is a multilayer flexible substrate (FPC1 is a gate-side substrate, FPC2 is a drain-side substrate), PCB is an interface substrate, SPS is a diffusion sheet, PRS is a prism sheet, GLB is a light guide, RFS is a reflector, G is a rubber cushion, MCA is the lower case (mold frame),
LP is a cold cathode fluorescent tube (CFL), LS is a light source reflector, L
PCH is a cable holder for a cold cathode fluorescent tube.

The upper case SHD shown in FIG.
Is manufactured by stamping and bending a single metal plate by a press working technique. WD is an opening that exposes the liquid crystal display element PNL to the field of view. In the liquid crystal display element PNL, a liquid crystal layer is sandwiched between two substrates, and a plurality of gate lines and drain lines arranged crosswise and thin film transistors are arranged at intersections of the gate lines and drain lines on the lower substrate. One pixel is composed of a pixel electrode driven by a thin film transistor.

The driving IC for driving the gate is a liquid crystal display element P
It is mounted on the lower board edge of the NL interface board PCB side, and supplies a drive signal to a drive IC for gate drive by the flexible board FCP1. A drive IC for driving the drain is mounted on the lower substrate on the side adjacent to the side on which the interface substrate is installed, and the flexible substrate FCP
2 supplies a drive signal to a drain drive IC.

Each of the above-described drive ICs and the flexible substrate F
The liquid crystal display device on which the CP1, the FCP2, and the interface substrate PCB are mounted is hereinafter referred to as a peripheral circuit mounted liquid crystal display device ASB.

A light guide GLB is provided on the inner periphery of the lower case MCA via a rubber cushion GC. Light guide GL
A reflector RFS is laminated on the back surface of B. On the upper surface of the light guide GLB, two prism sheets PRS (PR
S1, PRS2) and the diffusion sheet SPS are laminated, and the peripheral circuit-mounted liquid crystal display element ASB shown in FIG. 3 is mounted thereon, the upper case SHD is covered, and the fixed claws NL formed on the periphery of the upper case SHD are formed. A fixing recess formed in the lower case MCA is fitted and fixed, and a liquid crystal display device (also called a liquid crystal display module) is assembled.

Next, an example of the configuration of the liquid crystal display device according to the present invention will be described in more detail with reference to FIGS. In addition,
Although there may be slight differences in the configuration of each drawing, it should be understood that this means that the present invention is applicable to a plurality of types of liquid crystal display devices.

FIG. 9 is a completed assembly view of a liquid crystal display device (hereinafter also referred to as a liquid crystal display module). FIG. 9 is a front view and side views of the liquid crystal display element PNL as viewed from the front side (ie, the liquid crystal display element PNL side). It is. FIG. 10 is an explanatory diagram of an interface substrate on which the liquid crystal display module of FIG. 9 is mounted on the back surface and the side surface.

The liquid crystal display module MDL has two types of storage / holding members, a lower case (mold frame) MCA and an upper case (shield frame) SHD. H
LD is a personal computer with the module MDL as a display unit,
These are four mounting holes (screw holes) provided for mounting on an information processing device such as a word processor. The mounting hole H of the upper case SHD is located at a position corresponding to the mounting hole MH (shown enlarged in FIG. 22) of the lower case (mold case) MCA.
An LD is formed (FIG. 9), and is fixed to an information processing device (electronic device) such as a personal computer through a screw or the like in a mounting hole of both, and mounted. In the module MDL, a backlight inverter is arranged in the MI section (FIG. 13),
Power is supplied to the backlight BL via the connection connector LCT and the lamp cable LPC.

Signals from the main computer (host) and necessary power are supplied to the interface connector CT1 on the interface board located on the back of the module.
To the controller section and the power supply section of the liquid crystal display module MDL via the.

FIG. 10B shows an interface substrate P
It is explanatory drawing of the example of a structure of CB. The interface board PCB has a connector CT1 for receiving a signal from the main computer and a necessary power supply, and a low-voltage differential receiving circuit for converting a serial low-voltage differential signal received from the main computer into an original parallel signal. Chip LVD
S, a control circuit chip TCON, a digital / digital conversion circuit chip DD for generating various DC voltages, and connectors (inter-board connectors) CT3 and CT2 for connecting a gate-side flexible board FPC1 and a drain-side flexible board FPC2 described later. It is installed.

FIG. 11 shows a gate-side flexible substrate FPC.
FIG. 4 is a plan view of a principal part for explaining the arrangement of a flexible printed circuit board 1 and a drain-side flexible substrate FPC2. A driving IC for driving a gate is mounted on the upper surface of the liquid crystal display element PNL on the interface substrate side, and a gate-side flexible substrate FPC1 connected to the driving IC is arranged. Flexible board FP
A drive IC for driving the drain is mounted on the lower side of the liquid crystal display element PNL adjacent to C1, and a flexible substrate FPC2 connected to the drive IC is arranged. Gate side flexible substrate FPC1 of flexible substrate FPC2
A protruding portion JN4 is formed at the end on the side, and an inter-substrate connector CT4 for connecting to the inter-connector inter-connector CT2 of the interface substrate PCB is provided at the end, and the flexible substrate FPC2 is mounted on the back surface of the liquid crystal display element PNL. The connector CT4 is bent and connected to the connector CT2 of the interface board.

FIG. 8 is an exploded perspective view illustrating the overall structure of another example of the liquid crystal display device according to the present invention. As before,
SHD is the upper case, WD is the display window, SPC1 to SPC
4 is an insulating spacer, FPC1 and FPC2 are bent multilayer flexible circuit boards (FPC1 is a gate-side circuit board, FPC2 is a drain-side circuit board), PCB is an interface circuit board, and ASB is an assembled liquid crystal display element with a drive circuit board. , PNL is a liquid crystal display element having a driving IC mounted on one of two superposed transparent insulating substrates, PRS is a prism sheet (2 sheets), SP
S is a diffusion sheet, GLB is a light guide, RFS is a reflection sheet, MCA is a lower case (mold case) formed by integral molding, LP is a linear light source (cold cathode fluorescent tube), L
PC1 and LPC2 are lamp cables, LCT is a connector for an inverter, and GB is a rubber bush for indicating a cold cathode fluorescent tube, which is stacked in the vertical arrangement shown and fixed by the upper case SHD and the lower case MCA. The liquid crystal display device (liquid crystal display module) is assembled. Details of other configurations will be described below.

FIG. 13 is an assembled view of the liquid crystal display module, which is a front view, a front side view, a right side view, and a left side view of the liquid crystal display element PNL viewed from the front side (that is, the upper side, the display side). .

FIG. 14 is an assembled view of the liquid crystal display module, and is a rear view of the liquid crystal display element PNL as viewed from the rear side (ie, from below).

The liquid crystal display module MDL has two types of housing / holding members: a mold case MCA and a shield case SHD. The HDL is four mounting holes provided for mounting the module MDL as a display unit on an information processing device such as a personal computer or a word processor. A mounting hole HLD of the shield case SHD is located at a position corresponding to a mounting hole MH of the molded case MCA (FIGS. 21 and 22 described later).
Are formed (see FIG. 5), and are fixed and mounted on the information processing apparatus through screws and the like in both mounting holes. In the module MDL, the inverter for backlight is set to MI.
Connector LCT, lamp cable L
Power is supplied to the backlight BL via the PC.

Signals from the main computer (host) and necessary power are supplied to the controller and power supply of the liquid crystal display module MDL via the interface connector CT1 located on the back of the module.

FIG. 40 is a block diagram showing a TFT liquid crystal display element of the liquid crystal display module shown in FIG. 12 and circuits arranged on the outer periphery thereof. Although not shown, in the present configuration example, the drain drivers IC _{1 to} IC _M are the drain-side lead lines DT formed on one substrate of the liquid crystal display element.
Chip-on-glass mounting (COG mounting) is carried out using M and the gate side lead line GTM and an anisotropic conductive film or an ultraviolet curing resin.

In this configuration example, the XGA specification 800
Corresponding to × 3 × 600 effective dots, M drain driver ICs and N gate driver ICs are COG mounted. The drain driver section 103 is disposed below the liquid crystal display element, the gate driver section 104 is disposed on the left side, and the controller section 101 and the power supply section 102 are disposed on the same left side. The controller section 101, the power supply section 102, the drain driver section 103, and the gate driver section 104 are interconnected by electrical connection means JN1 and JN2, respectively. Also, the controller unit 101
The power supply unit 102 is disposed on the back surface of the gate driver unit 104.

Next, the structure of each component is shown in FIGS.
This will be described in detail with reference to FIG.

<< Metal Shield Case >> FIG. 13 shows an upper surface, a front side surface, a right side surface, and a left side surface of the upper case SHD.
FIG. 12 is a perspective view of the upper case SHD as viewed from obliquely above.

The upper case SHD is manufactured by stamping and bending a single metal plate by a press working technique. W
D is an opening that exposes the liquid crystal display element PNL to the field of view,
Hereinafter, it is referred to as a display window.

NL is the upper case SHD and the lower case MC
For example, there are 12 fixing claws with A. HK is also provided with, for example, six fixing hooks, each of which is provided integrally with the upper case SHD. The fixing claws NL shown in FIGS. 12 and 13 store the liquid crystal display element ABS with the drive circuit in the upper case SHD with the spacer SPC interposed therebetween before being bent, and are then bent inward to lower case MCA. Is inserted into a square fixing recess NR (see each side view of FIG. 21) (see FIG. 14 for a folded state).

The fixing hooks HK are fitted into fixing projections HP (see the side view in FIG. 21) provided on the lower case MCA. As a result, the upper case SHD for holding and housing the liquid crystal display element ABS with a drive circuit and the molded case MCA for holding and housing the light guide GLB, the cold cathode fluorescent lamp LP and the like are firmly fixed. A thin and long rectangular rubber cushion is provided around four edges of the lower surface of the light guide GLB (the rear surface of the reflection sheet) (see FIGS. 36 to 39 described later).

Further, the fixing claw NL and the fixing hook HK
Extend the bending of the fixing claws NL and fix the fixing hooks H
Since the removal is easy only by removing the K, the repair is easy and the replacement of the cold cathode fluorescent tube of the backlight BL is also easy. Further, in this configuration example, as shown in FIG. 14, one side is mainly fixed by the fixing hook HK, and the opposite side is fixed by the fixing claw NL. Can be disassembled simply by removing some of the fixing claws NL. Therefore, repair and replacement of the backlight are also easy.

The CSP is a through hole, and the relative position between the upper case SHD and the other parts is accurately set by inserting the through hole CSP into the pin that is fixed and erected at the time of manufacture and mounting the upper case SHD. It is for. The insulating spacers SPC1 to SPC4 are coated with an adhesive on both sides of the insulator, and can securely fix the upper case SHD and the liquid crystal display element ABS with a drive circuit while keeping the spacing between the insulating spacers. When the module MDL is mounted on an application product such as a personal computer, the through-hole CSP can be used as a reference for positioning.

<< Insulating Spacer >> FIGS. 12, 36 to 39
As shown in the figure, the insulating spacers SPC (SPC1 to SPC)
C4) not only secures the insulation between the upper case SHD and the liquid crystal display element ABS with a drive circuit, but also
Liquid crystal display device with drive circuit, ensuring position accuracy with D
S and the upper case SHD are fixed with a double-sided adhesive tape BAT.

<< Multilayer Flexible Substrates FPC1, FPC
2 >> FIG. 15 is a front view of a liquid crystal display device with a drive circuit board in which a gate-side flexible substrate FPC1 and a drain-side flexible substrate FPC2 before being bent are mounted on the outer peripheral portion of the liquid crystal display device PNL.

FIG. 16 shows an interface circuit board PCB.
FIG. 16 is a rear view of the liquid crystal display device with a drive circuit board of FIG.

FIG. 17 shows a case where the flexible boards FPC1, FPC2, and the interface circuit board PCB are mounted under the upper case SHD, and then the flexible board FPC is mounted.
2 to bend the liquid crystal display element PNL to the upper case SHD
FIG. 7 is a rear view showing a state in which the sheet is stored.

The left IC chip in FIG. 15 is a driving IC chip on the vertical scanning circuit side, the lower IC chip is a driving IC chip on the video signal driving circuit side, and an anisotropic conductive film (A in FIG. 34).
It is COG mounted on the substrate using CF2) or an ultraviolet curing agent.

In the conventional method, a tape carrier package (TCP) in which a driving IC chip is mounted by a tape automated bonding method (TAB) is connected to a liquid crystal display element PNL using an anisotropic conductive film. CO
In the G mounting, since the direct drive IC is used, the above TA
The process B is not required, the process is shortened, and the tape carrier is not required. In addition, CO
G mounting is suitable as a mounting technology for a high-definition and high-density liquid crystal display element.

Here, drain driver ICs are arranged in a line on one long side of the liquid crystal display element PNL, and a drain line is drawn out on one long side. The gate lines are also drawn out to one short side, but when the definition is further improved, the gate lines can be drawn out to two opposing short sides.

In the method of alternately drawing out the drain line or the gate line, the drain line DTM or the gate line GT is used.
The connection between M and the output-side bumps BUMP of the drive IC becomes easy, but it is necessary to arrange the peripheral circuit board on the outer periphery of the two long sides of the liquid crystal display element PNL opposed to each other. For this reason, there is a problem in that the outer dimensions are larger than in the case of one-side drawing. In particular, when the number of display colors increases, the number of data lines of display data increases and the outermost dimension of the information processing apparatus increases. In this configuration example, the drain line is drawn out to only one side using a multilayer flexible substrate. I have to.

FIGS. 25A and 25B are explanatory diagrams of the multilayer flexible substrate FPC2 for driving the drain driver. FIG. 25A is a back surface (lower surface) diagram, and FIG. 25B is a front (upper surface) diagram. FIGS. 26A and 26B are explanatory diagrams of the multilayer flexible substrate FPC1 for driving the gate driver. FIG. 26A is a back surface (lower surface) diagram, and FIG. 26B is a front (upper surface) diagram.

FIG. 31 is a structural explanatory view of the multilayer flexible substrate FPC2 shown in FIG. 25, and FIG.
(A) is a sectional view taken along line AA ', (b) is a sectional view taken along line B-
FIG. 3C is a cross-sectional view along the line B ′, and FIG. 3C is a cross-sectional view along the line CC ′. For the sake of explanation, the ratio of the dimension in the thickness direction and the dimension in the plane direction in FIG. 31 is different from the actual dimension and is exaggerated.

FIG. 28 is a schematic wiring diagram showing the connection relationship between signal wiring in the multilayer flexible substrate FPC and input signals to the driving IC on the substrate SUB1. The signal wiring in the multilayer flexible substrate FPC includes a first wiring group parallel to one side of the substrate SUB1 and a second wiring group perpendicular to the one side of the substrate SUB1. The first wiring group is a common wiring group for supplying a common signal between the driving ICs, and the second wiring group is a wiring group for supplying a signal required for each driving IC. Therefore, at least the partial FSL is 1
It is composed of multiple conductor layers. Further, the partial FML is composed of at least two conductor layers, and it is necessary to electrically connect the first wiring group and the second wiring group with through holes. In this configuration example, it is necessary to reduce the short side length of the portion FML to a length that does not touch the end of the lower deflection plate when bent.

That is, as shown in FIG. 31, three or more conductor layers, for example, eight conductor layers L1 to L in this configuration example.
8 is provided in parallel with one side of the liquid crystal display device PNL, and peripheral circuit wiring and electronic components are mounted on this portion, so that the number of layers can be maintained while maintaining the external dimensions of the substrate even when the number of data lines increases. Can be dealt with by increasing.

The conductor layer L1 is for component pad, ground,
2 is for a gray scale reference voltage _Vref , 5V (or 3.3V) power supply, L3 is for ground, L4 is for data signals and clocks CL2 and CL1, L5 is for lead-out wiring which is the second wiring group, and L6 is for gradation reference voltage V _ref, L7 is a data signal, L8 is 5V (or, 3.3V) power supply.

The connection between the conductor layers is made through holes VIA (FIG. 3).
3 (a)). Conductor layer L
1 to L8 are formed of copper Cu wiring, and input terminal wiring Td to the drive IC of the liquid crystal display element PNL (FIGS. 29 and 3)
0) is further plated with Au on a nickel-Ni underlayer on copper Cu.
Therefore, the connection resistance between the output terminal TM and the input terminal wiring Td can be reduced.

Each of the conductor layers L1 to L8 has an intermediate layer made of a polyimide film BFI as an insulating layer, and the conductor layers are fixed by an adhesive layer BIN. The conductor layer is covered with an insulating layer except for the output terminal TM, but the multilayer wiring portion F
In the ML, a solder resist SRS is applied to the uppermost and lowermost layers to secure insulation. Further, an insulating silk material SLK is attached to the outermost surface.

The advantage of the multilayer flexible substrate is that the conductor layer L5 including the connection terminal portion TM necessary for COG mounting is provided.
Can be integrally formed with other conductor layers, and the number of parts is reduced.

[0104] Further, by forming a portion FML of three or more conductor layers, a hard portion with little deformation can be provided, and a positioning hole FHL can be arranged in this portion. Even when bending the multilayer flexible substrate, reliable and accurate bending can be performed without deformation at this portion. Further, as will be described later, the solid shape or, for example, a diameter of 200 mm
A mesh-shaped conductor pattern ERH (see FIG. 33 (a)) provided with a large number of fine holes ESH of about m can be arranged on the surface layer L1, and the remaining two or more conductor layers are used for component mounting and peripheral wiring conductor patterns. Wiring can be performed.

Note that the protruding portion FSL does not need to be a single conductor layer, and the protruding portion FSL may be composed of two conductor layers. In this configuration, when the pitch of the input terminal wiring Td to the driving IC becomes narrow, the patterns of the terminal wiring Td and the connection terminal portion TM are formed in a staggered pattern in a plurality of rows of wiring groups. Or the like, and when the connection terminal portion TM in the first conductor layer is pulled out, the wiring group in one row meets the through hole VIA and is connected to the multilayer second conductor layer. When a part of the peripheral wiring is arranged on the second conductor layer in the protruding portion FSL, the configuration of the second conductor layer is effective.

As described above, by forming the projecting portion FSL with two or less conductor layers, heat transfer is good at the time of thermocompression bonding by heat sealing, pressure can be applied uniformly, and the connection terminal portion TM and the terminal The reliability of the electrical connection of the wiring Td can be improved. Also, when bending a multilayer flexible substrate,
Bending with high accuracy can be performed without applying bending stress to the connection terminal portion TM. Further, since the protruding portion FSL is translucent, the pattern of the conductor layer can be observed from the upper surface side of the multilayer flexible substrate, so that there is an advantage that pattern inspection such as a connection state can be performed from the upper surface side. In addition,
JT2 of FIG. 25 is a drain side flexible substrate FPC2.
A concave portion for electrically connecting the circuit board and the interface circuit board PCB, CT4 is a flexible substrate FPC2 provided at the tip of the convex portion JT and the interface circuit board PCB
This is a flat type connector for electrically connecting the power supply and the power supply.

FIGS. 26A and 26B are explanatory views of a main part of the multilayer flexible printed circuit FPC2. FIG. 26A is an enlarged detailed view of a portion J in FIG. 25A, and FIG. It is a side view.

[0108] In FIG. 26 (a), P _X is the wave of the wavelength of the polyimide film BFI end wavy, P _Y its wave height (amplitude × 2 wave), P ₁ is connecting the mountain each other wave linear (Referred to as a wave peak line), and P ₂ is a straight line connecting the wave valleys (referred to as a wave valley line). LY2 is (referred to as connection length) length of the connection portion of the substrate SUB1 of the multilayer flexible substrate FPC2, LY1 is the length between the connection portion and mountain line P ₁ of the wave with the substrate SUB1 of the multilayer flexible substrate FPC2 is there.

The drain-side flexible substrate FPC2 is
As shown in FIG. 26B, one end of the liquid crystal display element PN
The terminal of the drain line at the end of SUB1 of L (FIGS. 29 and 3)
0 Td) via an anisotropic conductive film ACF, folded at the middle of the wave height P _Y outside the edge, and the multilayer wiring portion FML at the other end is disposed on the lower surface of the SUB1 and has a double-sided adhesive. It is stuck on the lower surface of SUB1 by a tape BAT. The numbers 1 to 45 assigned to the output terminal TM in FIG. 21B are the numbers 1 assigned to the terminals T in FIGS. 29 and 30.
45, and are electrically connected via the anisotropic conductive film ACF1.

As described above, in this configuration, in the flexible board FPC2 for signal input whose one end is connected to the end of the substrate SUB1 of the liquid crystal display element and the other end is folded back on the lower surface (or upper surface) of the substrate SUB1. By forming the end of the polyimide film BFI of the projecting portion FSL into a wavy shape (or a shape having peaks and valleys such as a sawtooth shape) along the bending line direction, the end of the polyimide film BFI at the bent portion is formed. , And a good bending curve (R) can be provided at the bent portion, the occurrence of disconnection can be suppressed, and the reliability can be improved.

In this configuration example, the gate-side multilayer flexible substrate FPC1 has three conductor layers, and L1 is V
_dg (10V), V _sg (5V), V _ss (ground), L
2 is a lead wiring, clock CL3, FLM, V _dg (1
0 V), L3 is V _EG (-10 to -7 V), V _EE (-1
4 V), V _SG (5 V), and common voltage V _com .

Next, the alignment marks ALMG (FIG. 27A) on the multilayer flexible substrate and the ALMDs (FIG. 2)
6 (a)) will be described.

In the multilayer flexible substrates FPC1 and FPC2 shown in FIGS. 25 and 27, the length of the output terminal TM is usually designed to be about 2 mm in order to secure connection reliability. However, since the long sides of the flexible substrates FPC1 and FPC2 are long, a positional shift including slight rotation in the long axis direction may cause a positional shift between the input terminal wiring Td and the output terminal TM, resulting in a connection failure. . Liquid crystal display element PN
Positioning of the L and the flexible substrates FPC1 and FPC2 is performed by inserting holes FHL opened at both ends of each substrate into fixing pins, and then aligning the input terminal wiring Td and the output terminal TM at several places. However, in order to further improve the accuracy, two alignment marks ALMG and ALMD are provided for each protruding portion FSL.

In this configuration example, in order to improve the connection reliability, a dummy line NC is provided at a position adjacent to a predetermined number of input terminals TM, and a square-shaped alignment mark ALMG is formed on the dummy line by a pattern. The connection is made, and the square filling pattern (on the drain side, see ALC in FIGS. 29 and 30) on the opposing substrate SUB1 is positioned so as to fit exactly in the square.

The common voltage is applied from the conductive beads or paste to the substrate S through the pattern of the wiring Td on the substrate SUB1.
It is supplied to the common transparent pixel electrode COM on the UB2 side.

The alignment mark ALMG is provided in pattern connection with a terminal electrically connected to the common transparent pixel electrode COM, and is aligned with a square filling pattern ALD (see FIG. 26) on the substrate SUB1. Furthermore, in this configuration example, a joint pattern (not shown) for connecting to the flexible substrate FPC1 of the gate driver is provided at the lower end of the flexible substrate FPC2 of the drain driver in FIG.

Next, the shape of the conductor layer portion FSL of two or less layers will be described.

FS composed of single-layer or two-layer conductor wiring
The projecting shape of L was a convex shape separated for each driving IC. Thus, the pitch P _G and P _D terminal TM vary thermal expansion multilayer flexible substrate in the longitudinal direction at the time of thermocompression bonding of a heat tool, it is possible to prevent the phenomenon of peeling or poor connection occurs between the connection terminals Td. That is, the driving IC
It can be a thermal expansion amount corresponding to the length of the pitch P _G and P _D cycle of each even driver IC shift by up to a terminal TM by a separate convex shape for each. In this configuration example, the multilayer flexible substrate is formed into a convex shape divided into 10 in the major axis direction, the amount of thermal expansion can be reduced to about 1/10, which contributes to relaxation of application to the terminal TM, and The reliability of the liquid crystal display module MDL can be improved.

As described above, the alignment mark ALM
G and ALMD, and drive the protruding shape of the portion SL.
By forming the convex shape separated for each C, even if the number of connection wirings or the number of display data increases, the peripheral driving circuit can be reduced with high accuracy while ensuring connection reliability.

Next, three or more conductor layer portions FML will be described.

Chip capacitors CHG and CHD are mounted on the conductor layer portion FML of the FPC1 and FPC2. That is, in the gate-side multilayer flexible substrate FPC1, the chip capacitor CHG is soldered between the ground potential V _SS (0V) and the power supply V _dg (10V) or between the power supply V _sg (5V) and the power supply V _dg . Further, in the flexible substrate FCP2 on the drain side B, the ground potential V _SS
And the power supply V _dd (5 V or 3.3 V) or between the ground potential V _SS and the power supply V _dd
Is soldered. These capacitors CHG and CHD are for reducing noise superimposed on the power supply line.

In this configuration example, the above chip capacitor C
The HD was soldered only to one surface conductor layer L1 and was designed to be located entirely below the substrate SUB1 after bending. Therefore, it is possible to mount the power supply noise smoothing capacitor on the flexible substrates FPC1 and FPC2 while keeping the thickness of the liquid crystal display module MDL constant.

Next, a method for reducing high-frequency noise generated from an information processing device equipped with a liquid crystal display device will be described.

Since the upper case SHD side is the front side of the liquid crystal display module MDL and the front side of the information processing apparatus, the generation of EMI (electromagnetic interference) noise from this side depends on the usage environment for external devices. It creates big problems. For this reason, in this configuration example,
The surface layer L1 of the conductor portion FML is covered with a solid or mesh pattern ERH of a DC power supply as much as possible.

FIGS. 33A and 33B are explanatory diagrams of a conductor pattern of a multilayer wiring portion. FIG. 33A is a plan view showing a configuration of a surface conductor layer pattern of a multilayer wiring portion FML in a part of FIG. ) Shows a partially enlarged view of the interface circuit board PCB shown in FIG.

The mesh MESH is composed of a large number of holes of about 300 μm formed in the surface conductor layer L1, and this mesh-shaped pattern ERH is formed by the through holes VIA and the capacitors CHD.
It covers almost the entire surface except for parts.

<< Interface Circuit Board PCB >> FIG.
5 is an explanatory view of an interface circuit board having a controller section and a power supply section, and FIG.
(B) is a partial front side view of the mounted hybrid integrated circuit HI, and (c) is a front (top) view.

In this configuration example, a multilayer printed circuit board made of a glass epoxy material was used for the interface circuit board PCB (hereinafter, simply referred to as the board PCB). It should be noted that a multilayer flexible substrate can be used, but since this portion did not employ a bent structure, a multilayer printed circuit board was used which was relatively inexpensive.

All the electronic components are mounted on the lower surface side of the substrate PCB, which is the back side when viewed from the information processing apparatus side. One integrated circuit element TCON is disposed on the substrate for the display control device. The integrated circuit element TCON is not housed in a package, and is directly mounted on a circuit board PCB by using a ball grid array (Ball Grid Array).
y) It is implemented.

The interface connector CT1 is connected to the substrate P
It is located substantially at the center of the CB, and further includes a plurality of resistors, capacitors, circuit components EMI for removing high-frequency noise, and the like.

The hybrid integrated circuit HI is formed by hybridizing a part of the circuit and mounting a plurality of integrated circuits and electronic components mainly for forming a power supply on the upper and lower surfaces of a small circuit board. PCB
One is mounted above.

The electrical connection of the flexible board FPC1 as the gate driver board and the interface circuit board PCB via the electrical connection means JN1 uses the connector CT3 in this configuration.

FIG. 36 is a cross-sectional view taken along the line AA 'in FIG. 9, FIG. 37 is a cross-sectional view taken along the line BB', FIG. 38 is a cross-sectional view taken along the line CC ', and FIG. FIG. 4 shows a cross-sectional view taken along line D ′.

As shown in FIG. 37, the liquid crystal display element PN
When viewed from a direction perpendicular to the substrates SUB1 and SUB2 constituting L, the interface circuit substrate PCB is overlapped with the liquid crystal display element PNL, and is disposed below the lower surface of SUB1. Further, one end of the flexible substrate FPC1 for the gate driver has a liquid crystal display element PN.
L directly and mechanically connected to the substrate SUB1 of L,
Unlike the drain side, almost the entire width is superimposed on the interface circuit board PCB without bending.

As described above, the interface circuit board P
By partially overlapping the CB with the substrate SUB1 of the liquid crystal display element PNL and further arranging the gate driver circuit board FPC1 on the interface circuit board PCB, the width and area of the frame portion can be reduced, and the liquid crystal display can be reduced. The external dimensions of the device and an information processing device such as a personal computer or a word processor incorporating the liquid crystal display device as a display portion can be reduced.

Liquid crystal display element PNL and shield case SH
D is provided with a spacer SPC made of resin or the like between the substrate SUB1 below the liquid crystal display element PNL, and is fixed above and below it with a double-sided adhesive tape BAT interposed therebetween.

A plurality of openings HOLS are formed in the shield case SHD in the longitudinal direction, and the protrusions SPC2-P formed on the spacer SPC are fitted to prevent the spacer SPC from shifting.

<< Liquid crystal display element ABS with drive circuit board >>
As shown in FIG. 26, a flexible substrate F for a drain driver is provided on the side opposite to the pattern forming surface of the substrate SUB1.
PC2 is bent and adhered. Polarizing plates POL1 and POL2 are located slightly (about 1 mm) outside the effective display area AR, and the end of the FPC 2 is located about 1 to 2 mm away therefrom.

The distance from the end of the substrate SUB1 to the tip of the bent portion of the FPC2 is as small as about 1 mm.
Compact mounting becomes possible. Therefore, in the present configuration example, the distance from the effective display area AR to the tip of the protrusion of the bent portion of the FPC 2 was about 7.5 mm.

FIG. 32 is a perspective view for explaining a method of bending and mounting a multilayer flexible substrate. The connection between the flexible substrate FPC2 for the drain driver and the flexible substrate FPC1 for the gate driver is performed by using a FP as a joiner.
A flat connector CT4 provided at the tip of a convex portion JT2 made of a flexible substrate integrated with C2 is used.

The flat connector CT4 is provided on the surface side of the convex portion JT2. First, the flat connector CT4 is folded around the line BTL in the BENT1 direction, and then folded in the BENT2 direction to be connected to the connector CT2 of the interface board PCB (see FIG. 37). . In addition, fixing of the FPC2 and the substrate SUB1 is as follows.
This is performed by inserting a double-sided adhesive tape between the FPC 2 and the substrate SUB1.

<< Rubber Cushion GC >> Rubber Cushion G
C is as shown in FIGS. 8, 12, 36 to 39,
The light guide GLB and the liquid crystal display element PNL are interposed between the reflection sheet provided on the lower surface of the light guide GLB and the lower case MCA, and the elasticity of the light guide GLB and the liquid crystal display element PNL are used for the upper case SHD and the lower case MCA. Fix between. The rubber cushion GC is installed around the light guide GLB, or alternatively, the nail NL formed on the upper case SHD and the lower case MCA
May be interposed only in the engagement portion of.

At least one surface of the rubber cushion GC is provided with an adhesive or a double-sided adhesive tape.
B and the lower case MCA are attached to one of them, and the other is fixed.

<< Backlight BL >> As shown in FIG. 36, the backlight BL includes a light guide GLB, an optical sheet member including a diffusion sheet SPS and a prism sheet PRS provided on the upper surface thereof, and a lower surface of the light guide GLB. Sheet RFS installed in the light source, a linear light source (cold cathode fluorescent tube) LP installed along one end surface of the light guide GLB, and a light source reflector LS
It is composed of Each of these members is a lower case MCA
In the recess.

The light source reflector LS is installed above the linear light source LP along the longitudinal direction, and is fixed to the edge of the light guide GLB (above the prism sheet PRS) and the edge of the lower case MCA with a double-sided adhesive tape BAT. Have been.

In the configuration example, the reflection sheet RFS provided on the lower surface of the light guide GLB is extended to a position below the linear light source LP, and the extended portion RFS-E is used as a lower light source reflector. However, the lower light source reflector is not necessarily required, and the inner surface of the lower case MCA only needs to be light reflective (mirror surface or white). Also, on the inner wall side of the linear light source LP opposite to the light guide GLB, even if light from the linear light source LP is reflected, most of the light is blocked by the linear light source and is not used. Although it is not necessary to install, if the gap between the linear light source LP and the reflection plate LS or the lower surface of the lower case MCA becomes large, the inner wall (including the bottom surface) of the lower case MCA is made light-reflective (mirror surface or (White), the light utilization factor can be improved.

FIG. 18 is a front view of the backlight BL (the liquid crystal display element PNL side), FIG. 19 is a front view of the backlight of FIG. 18 with the prism sheet PRS and the diffusion sheet SRS removed, and FIG. FIG. 20 is a front view similar to FIG.

The lamp cables LPC (LPC1, LPC2) of the cold cathode fluorescent tubes, which are the linear light sources LP, are wired on the side surfaces of the liquid crystal display element PNL, and supplied with power from an inverter power supply board (not shown) via the lamp connector LCT. GB is a rubber bush that holds the lamp cable LPC.

<< Diffusion Sheet SPS >> Diffusion Sheet SPS
Is mounted on the light guide GLB and diffuses light emitted from the upper surface of the light guide GLB to uniformly certify the liquid crystal display element PNL.

<< Prism Sheet PRS >> In this configuration example, the prism sheet PRS is composed of two sheets, and the diffusion sheet SPS is used.
Are placed on top of each other, and each prism sheet having a smooth lower surface and a prism surface as an upper surface is arranged so that the prism grooves are perpendicular to each other. This prism sheet P
RS transmits light from the diffusion sheet SPS to the liquid crystal display element PNL.
Light is collected in the direction to improve the brightness of the backlight BL.
As a result, the power consumption of the backlight can be reduced, and the size and weight of the liquid crystal display module can be reduced.

Diffusion sheet SPS and prism sheet PRS
Are provided with two fixing small holes SLV whose positions coincide with each other at the time of installation of the sheet, and a pin-shaped protrusion M is formed at the corresponding one end of the mold case MCA.
A PN is formed, and both are inserted and aligned via the sleeve SLV. The sleeve SLV is made of, for example, an elastic body such as silicon rubber, and has an inner diameter smaller than an outer diameter of the convex portion MPN, thereby preventing the sleeve SLV from falling off.

Note that, as shown in FIG.
On the side opposite to P, the diffusion sheet SPS is provided on a pin-shaped projection MPN integrally provided at one side end of the lower case MCA.
By inserting a small hole provided in the prism sheet PRS and aligning it, more accurate alignment can be performed.

Since the convex portion MPN is located below the gate-side flexible substrate FPC1 at a position not overlapping the circuit board PCB in a plane, the thickness of the liquid crystal display module is not increased.

<< Lower Case (Molded Case) MCA >>
FIG. 21 is an explanatory view of the mold case MCA, and FIG.
22 is an enlarged view of a portion A, a portion B, a portion C, and a portion D of FIG. A molded case MCA, which is a lower case formed by molding, includes a cold cathode fluorescent tube LP, a lamp cable LPC,
This is a backlight storage case that holds the light guide GLB and the like, and is made of a synthetic resin in one mold by integral molding.

The lower case MCA is tightly united with the metal upper case SHD by the action of each fixing member and the elastic body, so that the vibration resistance and the thermal shock resistance of the liquid crystal display module MDL can be improved, and the reliability is improved. Is increasing.

On the bottom surface of the lower case MCA, a large opening MO occupying at least half the area of the bottom surface is formed at the center except for the surrounding frame portion. Thus, after assembling the lower case NCA, the lower surface is formed by the force applied vertically from the upper surface to the lower surface on the bottom surface of the lower case MCA by the action of the rubber cushion GC between the backlight BL and the lower case MCA. The bottom surface of the case MCA can be prevented from expanding, the increase in the maximum thickness is suppressed, and the liquid crystal display module MDL can be made thinner and lighter.

The MCL in FIG. 21 is a cutout provided in the lower case MCA at a location corresponding to the mounting portion of the power supply circuit DC-DC converter shown in FIG. 16 and FIG. 35 on the interface circuit board PCB. Notch (including notch for connecting connector CT1).

As described above, by providing the cutout without covering the heat generating portion on the circuit board PCB with the lower case, the heat radiation of the heat generating portion of the interface circuit board PCB can be improved. In addition, an integrated circuit TC for display control
ON is also considered a heat-generating part, and the lower case MCA above this
May be cut out.

MH in FIG. 21 is a reference numeral 4 for attaching the liquid crystal display module MDL to an electronic device such as a personal computer.
Mounting holes (screw holes). The upper case SHD is also provided with mounting holes HLD corresponding to the mounting holes MH of the lower case MCA, and is fixed and mounted on the application device using screws or the like passing through these mounting holes. MB in FIGS. 21 and 22 is a holding portion of the light guide GLB, and PJ is a positioning portion. MC1 to MC4 are storage sections for the lamp cables LPC1 and LPC2.

<< Storing of Light Guide GLB in Lower Case MCA >> FIGS. 23A and 23B are explanatory views of a housing portion of the light guide GLB in the lower case MCA. FIG. 23A is a plan view of a main part, and FIG. (A) shows the conventional structure of the corner portion, and (c) shows the structure of this configuration example of the corner portion.

As shown in FIG. 23A, the light guide GL
The four corners of B are provided with straight bevels which are chamfered, and a straight slanting positioning part PJ is also formed on the lower case MCA corresponding to the bevels. Conventionally, as shown in (b), since the corner portion is at a right angle, the light guide GLB, which is a weak component against the force F in the side direction (y direction) of the light guide GLB and is heavy, is subject to vibration and impact. As a result, the positioning portion PJ was sometimes damaged.

In this configuration example, as shown in FIG. 23 (c), the light acting on the positioning portion PJ is dispersed in two directions fx and fy by forming the light guide GLB and the positioning portion PJ in an oblique shape. In addition, the positioning portion PJ can be prevented from being damaged, and the reliability is improved.

<< Arrangement of Cold Cathode Fluorescent Tube LP and Light Source Reflecting Plate LS >> As shown in FIG. 23A, the light source reflecting plate LS is provided above the linear light source (cold cathode fluorescent tube) LP by a light guide. G
The LB and the mold case MCA are bridged and fixed using a double-sided adhesive tape. The cross-sectional structure of this part is shown in FIG.

As shown in FIG. 36, a cold cathode fluorescent tube LP as a linear light source is installed near one end surface of a light guide GLB, and a light source reflector LS is provided above the light guide GLB.
Fixed at T.

In FIG. 18 to FIG. 20, the cold cathode fluorescent lamp LP constituting the backlight BL is a liquid crystal display module MDL.
Are arranged on the long side and below the display area. That is, as shown in FIGS. 46 and 47, when mounted on an information processing device such as a personal computer or a word processor, the cold cathode fluorescent lamp LP is located below the long side of the display unit. In the example shown in FIGS. 18 and 19, when the inverter IV is arranged in the inverter storage section MI in the display section, the lamp cable LPC1 is connected to the left and upper 2 of the liquid crystal display module MDL.
The lamp cable LPC2 is wired along the right side.
Wired along the sides. On the other hand, in the example shown in FIG.
The case where the inverter IV is arranged in the keyboard is shown,
The lamp cable LPC1 is wired along three sides of the left, upper and right sides of the liquid crystal display module MDL, and both lamp cables LPC1 and LPC2 are from the lower right.

By arranging the cold cathode fluorescent lamps LP below the display section of the liquid crystal display module MDL in this manner, FIG.
When the inverter IV is arranged in the keyboard section as shown in FIG.
The length of the PC 2 can be shortened, the impedance causing noise and a change in waveform can be reduced, and the startability of the cold cathode fluorescent lamp LP can be improved. In addition,
When the inverter IV is arranged on the keyboard side, the width of the display unit can be further reduced. Furthermore, a cold cathode fluorescent tube LP
Is arranged below the display unit, the shock caused by opening and closing the display unit is reduced, and the reliability is improved. Then, since the center of the display surface of the liquid crystal display element PNL shifts upward,
There is also an effect that it is possible to prevent a hand striking the keyboard by the user from being difficult to see below the display screen.

In the above configuration, the cold-cathode fluorescent lamp LP is installed below the long side of the liquid crystal display element PNL. However, it is needless to say that it can be installed above the long side or the short side. In the liquid crystal display device shown in FIG. 8, it is installed on the right short side.

FIG. 40 is a block diagram illustrating a circuit configuration of a liquid crystal display element PNL and a driving circuit and the like arranged on the outer periphery thereof. In this configuration, a thin film transistor (TFT)
Driver unit 103 is disposed only below the liquid crystal display element PNL (TFT-LCD).
The gate driver unit 104 and the controller unit 1
01, a power supply unit 102 is provided.

The drain driver section 103 is mounted by bending the above-mentioned multilayer flexible substrate. The interface board PCB on which the controller unit 101 and the power supply unit 102 are mounted is arranged on the back surface of the gate driver unit 104 arranged on the outer periphery of the short side of the liquid crystal display element PNL. This is because the width of the information processing apparatus is limited, and it is necessary to reduce the width of the liquid crystal display module MDL constituting the display unit as much as possible.

As shown in FIG. 41, the thin film transistor TFT is arranged in an intersection region between two adjacent drain signal lines DL and two adjacent gate signal lines GL. A drain electrode and a gate electrode of the thin film transistor TFT are respectively connected to a drain signal line DL and a gate signal line GL.
Connected to.

Since the source electrode of the thin film transistor TFT is connected to the pixel electrode and a liquid crystal layer is provided between the pixel electrode and the common electrode, a liquid crystal capacitance (C _LC ) is provided between the thin film transistor TFT and the source electrode of the thin film transistor TFT. Connected equivalently. The thin film transistor TFT becomes conductive when a positive bias voltage is applied to the gate electrode, and becomes non-conductive when a negative bias voltage is applied. A storage capacitor C _add is connected between the source electrode of the thin film transistor TFT and the previous gate signal line.

It should be understood that the source electrode and the drain electrode are originally determined by the bias polarity between them, and in this liquid crystal display device, the polarities are inverted during the operation, so it is understood that the source electrode and the drain electrode are switched during the operation. However, in the following description, one is fixed as a source electrode and the other is fixed as a drain electrode for convenience.

FIG. 42 is a block diagram showing a schematic configuration of each driver (drain driver, gate driver, common driver) of the liquid crystal display element and a signal flow. The display control element 201 and the buffer circuit 210 are provided in the controller unit 101 shown in FIG.
Are provided in the drain driver unit 103 shown in FIG.
The gate driver 206 is the gate driver unit 10 of FIG.
4.

The drain driver 211 comprises a data latch section for display data and an output voltage generating circuit. Further, the gradation reference voltage generator 208 and the multiplexer 20
9, common voltage generation unit 202, common driver 203,
Level shift circuit 207, gate-on voltage generator 20
4. The gate-off voltage generation unit 205 and the DC-DC converter 212 are provided in the power supply unit 102 shown in FIG.

FIG. 43 is a diagram showing the levels of the common voltage, the drain voltage, and the gate voltage and their waveforms. The drain waveform shows a waveform in black display.

FIG. 44 is an explanatory diagram of the flow of display data and clock signals for the gate driver 206 and the drain driver 211. FIG. 45 is a timing chart showing display data input from the main computer (host) to the display control device 201 and signals output from the display control device 201 to the drain driver and the gate driver.

The display control device 201 is provided with control signals (clock signal, display timing signal,
(A synchronization signal), a clock D1 (CL1), a shift clock D
2 (CL2) and display data, and at the same time, a frame start instruction signal FLM, a clock G (CL3) and display data as control signals to the gate driver 206.

The carry output at the preceding stage of the drain driver 211 is directly used as the drain driver 211 at the next stage.
Carry input.

As is apparent from FIG. 45, the shift clock signal D2 (CL2) of the drain driver is the same as the frequency of the clock signal (DCLK) and display data input from the main body computer, and is about 40 MHz in the XGA display element. And the EMI countermeasures become important.

<< Information Processing Apparatus Mounted with Liquid Crystal Display Module MDL >> FIGS. 46 and 47 are perspective views of a notebook computer or a word processor mounted with the liquid crystal display module MDL, respectively. As described above, FIG. 46 shows the inverter IV as a display unit, that is, a liquid crystal display module MD.
FIG. 47 shows a case where it is arranged in the keyboard unit, and FIG.

A signal from the information processing device first goes from a connector located at substantially the center of the left interface substrate PCB to the display control integrated circuit element TCON, and the converted display data is sent to the drain driver peripheral circuit. Flows. As described above, by using the COG method and the multilayer flexible substrate, the restriction on the outer width of the information processing device can be eliminated, and a small-sized information processing device with low power consumption can be provided.

<< Plane and Cross-sectional Structure Near the Driving IC Chip Mounting Portion >> FIG. 29 shows the lower substrate S of the liquid crystal display element PNL.
FIG. 3 is an enlarged view of a main part showing a state where a driving IC is mounted on UB1. FIG. 30 shows the vicinity of the mounting portion of the drain driving IC of the lower substrate SUB1 of the liquid crystal display element and the cutting line CT of the substrate.
1 is a plan view of a main portion near FIG.
It is sectional drawing along the -B 'line and CC' line. In FIG. 29, the upper substrate SUB2 is indicated by a dashed line, but is positioned above the lower substrate SUB1 so as to overlap with the seal pattern S.
L encloses the liquid crystal LC including the effective display area AR.

The electrode COM on the substrate SUB1 is a wiring to be electrically connected to the common electrode pattern on the substrate SUB2 via conductive beads or silver paste. Wiring DTM
(Or GTM) is to supply an output signal from the driving IC to a wiring in the effective display unit AR. The input wiring Td supplies an input signal to the driving IC.
The anisotropic conductive film ACF includes a plurality of driving I
An elongated ACF2 common to the portion C and an elongated ACF1 common to the input wiring pattern portions to the plurality of driving ICs are separately attached.

The passivation film (protective film) PSV1,
The PSV2 is also shown in FIG. 34, but covers the wiring portion as much as possible to prevent electrolytic corrosion, and exposes the anisotropic conductive film ACF1.
To cover.

Further, the periphery of the side surface of the driving IC is filled with an epoxy resin or a silicone resin SIL (see FIG. 34), and protection is multiplexed.

In FIG. 43, the gate-on level waveform (DC) and the gate-off level waveform are -9V to -14V.
V, and turns on at 10V. The drain waveform (during black display) and the common voltage V _com waveform are approximately 0V to 3V.
The level changes between V. For example, in order to change the drain waveform of the black level every horizontal period (1H), the logic processing circuit performs logical inversion on a bit-by-bit basis and inputs the result to the drain driver. The gate off-level waveform operates with substantially the same amplitude and transfer as the common voltage V _com .

FIG. 42 is an explanatory diagram of the flow of display data and clock signals to the gate driver 104 and the drain driver 103. As described above, the display control device 10
1 is a control signal (clock signal,
Upon receiving the display timing signal and the synchronization signal, the clock D1 (CL) is used as a control signal to the drain driver 103.
1), a shift clock D2 (CL2) and display data are generated, and at the same time, as a control signal to the gate driver 104, a frame start instruction signal FLM and a clock G (CL
3) and generate display data.

The carry output at the previous stage of the drain driver 103 is directly used as the drain driver 103 at the next stage.
Is given to the carry input.

As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention. Needless to say. For example, in the above embodiment, the present invention is applied to an active matrix type liquid crystal display device.
The present invention can be similarly applied to other types of liquid crystal display devices. The present invention is not limited to the flip-chip type in which the driving IC is directly mounted on a substrate, but can be similarly applied to a conventional device using TCP.

[0190]

As described above, according to the present invention,
It is possible to provide a liquid crystal display device having a structure in which the ease of assembly in narrowing the frame, the space for arranging parts are reduced, and the parts are prevented from being damaged during the assembling work to improve the yield.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a side view of a main part viewed from the direction of arrow F in FIG.

FIG. 3 is a cross-sectional view of a main part of FIG. 1, which further schematically illustrates the configuration of the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a first example of an inter-board connector for explaining a second embodiment of the liquid crystal display device of the present invention.

FIG. 5 is an explanatory diagram of a second example of an inter-board connector for explaining a second embodiment of the liquid crystal display device of the present invention.

FIG. 6 is an expanded sectional view of a main part for explaining a third embodiment of the liquid crystal display device of the present invention.

FIG. 7 is an exploded perspective view showing a state before a liquid crystal display element is covered by an upper case constituting an example of a housing of the liquid crystal display device.

8 shows a state before an illumination light source (backlight) and various optical films stacked on the upper case and the lower surface of the liquid crystal display element shown in FIG. 3 are housed in the lower case and fixed to the upper case in FIG. 7; FIG.

FIG. 9 is an assembled view of the liquid crystal display device (liquid crystal display module), showing a front view and side views of the liquid crystal display element PNL as viewed from the front side.

10 is an explanatory diagram of an interface board mounted on the back and side surfaces of the liquid crystal display module of FIG.

FIG. 11 is a plan view of an essential part for explaining an arrangement of a gate-side flexible substrate FPC1 and a drain-side flexible substrate FPC2.

FIG. 12 is an exploded perspective view illustrating all other configurations of the liquid crystal display device according to the present invention.

FIG. 13 is an assembled view of the liquid crystal display module,
FIG. 3 is a front view, a front side view, a right side view, and a left side view of the liquid crystal display element as viewed from the front side.

FIG. 14 is an assembled view of the liquid crystal display module,
FIG. 3 is a rear view of the liquid crystal display element as viewed from the rear side.

FIG. 15 is a front view of a liquid crystal display device with a driving circuit board in which a gate-side flexible substrate and a drain-side flexible substrate before being bent are mounted on an outer peripheral portion of the liquid crystal display device.

FIG. 16 shows a state in which an interface circuit board is mounted.
FIG. 3 is a rear view of the liquid crystal display device with a drive circuit board of FIG.

FIG. 17 is a rear view showing a state in which a flexible board and an interface circuit board are mounted under a shield case SHD, and then the flexible board is bent to accommodate a liquid crystal display element in the shield case.

FIG. 18 is an explanatory diagram of a front side and a front side of a backlight.

FIG. 19 is an explanatory view of a front surface and a front side surface in which a prism sheet and a diffusion sheet are removed from the backlight of FIG. 18;

FIG. 20 is an explanatory view of the front and front sides similar to FIG. 19, showing another configuration example of the backlight.

FIG. 21 is an explanatory diagram of a lower case (mold case).

FIG. 22 is an enlarged explanatory view of a corner portion of the mold case of FIG. 21;

FIG. 23 is an explanatory diagram of mounting a light source reflector in a storage portion of the light guide GLB in a molded case MCA.

FIG. 24 is an explanatory diagram of an installation state of a reflection plate of a linear light source.

FIG. 25 is an explanatory diagram of a multilayer flexible substrate FPC2 that drives a drain driver.

FIG. 26 is an explanatory diagram of a mounting portion of the multilayer flexible substrate PC2.

FIG. 27 is an explanatory diagram of a multilayer flexible substrate that drives a gate driver.

FIG. 28 is a wiring diagram showing a connection relationship between signal wiring in a multilayer flexible substrate and input signals to a driving IC on a lower substrate.

FIG. 29 is an explanatory diagram of a state where a driving IC is mounted on a lower substrate of a liquid crystal display element.

FIG. 30 shows a drain driving I on the lower substrate of the liquid crystal display element.
FIG. 4 is a plan view of a main part around a mounting portion of C and near a cutting line CT1 of the substrate.

FIG. 31 is a sectional view taken along lines AA ′, BB ′, and CC ′ in FIG. 25;

FIG. 32 is a perspective view showing a method of bending and mounting a multilayer flexible substrate and a connection portion with another multilayer flexible substrate.

FIG. 33 is a partially enlarged view of the surface conductor layer of the multilayer flexible board FPC and the interface circuit board shown in FIG. 35;

FIG. 34 is a sectional view taken along line A-A ′ of FIG. 29;

FIG. 35 is an explanatory diagram of an interface circuit board PCB.

36 is a sectional view taken along line A-A 'of FIG.

FIG. 37 is a sectional view taken along line B-B ′ of FIG. 9;

FIG. 38 is a sectional view taken along line C-C ′ of FIG. 9;

39 is a sectional view taken along line D-D 'of FIG.

FIG. 40 is a block diagram illustrating a circuit configuration of a liquid crystal display element PNL and a driving circuit and the like arranged on an outer peripheral portion thereof.

FIG. 41 is a block diagram illustrating an equivalent circuit of a liquid crystal display element.

FIG. 42 is a diagram illustrating the flow of display data and a clock signal for a gate driver and a drain driver.

FIG. 43 is a diagram showing levels of common voltage, drain voltage, and gate voltage and waveforms thereof.

FIG. 44 is a block diagram showing a schematic configuration of each driver (drain driver, gate driver, common driver) of the liquid crystal display element and a signal flow.

FIG. 45 is a timing chart showing display data input from the main computer (host) to the display control device and signals output from the display control device to the drain driver and the gate driver.

FIG. 46 is a perspective view of a notebook computer or a word processor on which a liquid crystal display module is mounted.

FIG. 47 is a perspective view of another notebook computer or word processor on which a liquid crystal display module is mounted.

FIG. 48 is an explanatory diagram of a configuration example of a mounting portion of a liquid crystal display device.

FIG. 49 is an explanatory diagram of an inter-board connector for connecting printed circuit boards.

FIG. 50 is an explanatory diagram of the assembling work of the liquid crystal display device.

[Explanation of symbols]

 SHD Upper case (Shield case) MCA Lower case (Mold case) HLD Screw hole MH Screw receiving hole SHDS Side wall SHDP Step plane Cut-off Notch GLB Light guide LP Linear light source (Cold cathode fluorescent tube) LS (LS-1, LS-2) Light source reflector ALCV recess RFS reflector.

Claims (4)

[Claims] 1. A liquid crystal display element, a light guide, a linear light source disposed at least along one end face of the light guide, and a surface of the light guide opposite to the liquid crystal display element. An upper light source comprising an illumination light source having a reflection sheet installed therein, an upper case having a window formed in an effective display area of the liquid crystal display element and a screw hole formed in at least one corner of a side edge, and a recess holding the illumination light source. In the liquid crystal display device sandwiched and fixed between the lower case and the lower case, a screw hole of the upper case is formed on a step surface in which an outer edge of a frame of the upper case is connected to a side wall dropped into the lower case side. A notch is formed in a portion of the connecting portion between the step surface and the side wall where the head of the headed screw abuts. 2. A liquid crystal display device in which printed circuit boards are electrically connected by board-to-board connectors mounted on at least two peripheral edges of the liquid crystal panel and mounted with a drive circuit for driving the liquid crystal panel. The inter-board connector includes a housing formed of an insulating material and a plurality of contact terminals exposed on an upper surface of the housing.
A plurality of connection terminals connected to each of the contact terminal portions and implanted outward from the side wall of the housing and partially or entirely folded back to the bottom surface side of the housing and welded to the printed circuit board. A liquid crystal display device comprising: 3. The liquid crystal display device according to claim 2, wherein the plurality of connection terminals are alternately folded on the bottom side of the housing. 4. A liquid crystal display element, a light guide, a linear light source disposed at least along one end face of the light guide, and a light guide on a surface of the light guide opposite to the liquid crystal display element. An illumination light source having an installed reflection sheet and an upper case having a bent side bent toward the lower case side while forming a window in an effective display area of the liquid crystal display element, and a bent side of the upper case. In a liquid crystal display device in which the periphery of the lower case is engaged and the liquid crystal display element and the illumination light source are sandwiched and fixed, the edge of the bent side of the periphery of the upper case is subjected to a burr crushing process. Characteristic liquid crystal display device.