JPH06342143A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To maintain the voltages of non-display transparent electrodes at non-selection voltages at all times without providing circuits for forming and supplying the non-selection voltages subjected to current alternating and to prevent the adverse influence that the voltages of transparent electrodes for non-display of a liquid crystal display element exert on the display. CONSTITUTION:This liquid crystal display device includes a tape carrier package(TCP) 1 which is mounted with a semiconductor IC chip 34 for driving liquid crystals by a time-division driving system and electrically connects the liquid crystal display element and a driving circuit board. This TCP 1 has at least one piece of output terminals 2 for non-display which alternately output one of two pieces of the non-selection voltages by a current alternating signal with one of two pieces of the non-selection voltage inputted to '1' of the inputted current alternating signal as output and another one of two pieces of the non- selection voltage inputted to '0' of the inputted current alternating signal as output. These output terminals 2 for non-display are connected to the transparent electrodes for non-display of the liquid crystal display element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a tape carrier package ((Tape Carrier Package)) which mounts a liquid crystal driving semiconductor IC chip by a time division driving system and electrically connects a liquid crystal display element and a driving circuit board. Hereinafter, a liquid crystal display device including TCP).

[0002]

2. Description of the Related Art A conventional twisted nematic type of liquid crystal display device has a 90 ° twisted helix structure made of nematic liquid crystal having a positive dielectric anisotropy between two electrode substrates, and A pair of polarizing plates is arranged outside the electrode substrate such that the polarization axis (or absorption axis) thereof is orthogonal or parallel to the axis of liquid crystal molecules adjacent to the electrode substrate (Japanese Patent Publication No. 13666
Issue).

In such a liquid crystal display device having a twist angle of 90 °, there are problems in the steepness γ of the change in the transmittance of the liquid crystal layer with respect to the voltage applied to the liquid crystal layer and in the viewing angle characteristics. The practical limit was 64 for the number of electrodes). However, in order to cope with recent demands for improving image quality and increasing the amount of display information for liquid crystal display elements, the twist angle α of liquid crystal molecules sandwiched between a pair of polarizing plates is set to be larger than 180 °, and the voltage applied to this liquid crystal layer is increased. Applying physics by TJ Scheffer and J. Nailing to improve the time-division drive characteristics and increase the number of time-divisions by adopting a configuration that detects changes in the birefringence effect of the liquid crystal layer due to
Letter 45, No. 10, 1021, 1984 "Ann Hailey
Multiplexer "(Applied Physics Letter, T.J.
Scheffer, J. Nehring: “A new, highly multiplexabl
e liquid crystal display ”), and a super twisted birefringence effect (SBE) liquid crystal display device has been proposed.

In a liquid crystal display device, for example, an upper electrode substrate and a lower electrode substrate are superposed on each other with a predetermined gap so that the surfaces on which electrodes made of a transparent conductive film and an alignment film are laminated face each other. And a liquid crystal display element in which a liquid crystal is sealed between both substrates by a sealing material provided around the edge between the two substrates and liquid crystal is sealed between the both substrates. , A driving circuit board having a driving circuit for the liquid crystal display element, which is arranged on the outer side of three sides of the liquid crystal display element, and a semiconductor IC chip for driving the liquid crystal, are mounted to electrically connect the liquid crystal display element and the driving circuit board. A plurality of TCPs to be connected, a backlight provided below the liquid crystal display element for supplying light to the liquid crystal display element, a frame-shaped body which is a molded product holding each of these members, and each of these members To store Is configured to include a liquid crystal display window is opened metal frame or the like.

The output terminal of the drive circuit board and the input terminal of the TCP (outer lead on the input side) are connected, and the output terminal of the TCP (outer lead on the output side) is connected to the input terminal taken out from the transparent electrode of the liquid crystal display element. It Conventional TC
As the output terminal of P, only the output terminal connected to the transparent electrode for display in the image display area is provided, or in addition to this, there is a so-called NC ((No Connection) no connection) terminal without output. was there. In the latter case, the NC terminal on the output side and the NC terminal on the input side were connected in TCP, and when a signal was input to the NC terminal on the input side, the signal could be output to the NC terminal on the output side.

Further, as described in Japanese Patent Application Laid-Open No. 4-81887, in order to always keep the color tone of the display screen constant, a transparent electrode facing the area other than the image display area is provided, and X on the transparent electrode other than the image display area
A liquid crystal display device provided with a circuit for applying an electrode non-selection voltage has been proposed.

FIG. 14 is a diagram showing a configuration including a drive circuit of this liquid crystal display device.

Reference numeral 62 denotes a liquid crystal display element of this liquid crystal display device,
Reference numeral 11 is an upper electrode substrate, 12 is a lower electrode substrate, 71 is an image display region, 72 is a non-display transparent electrode other than the image display region 71 (transparent electrode for controlling the gap between both substrates), and 73 is a part of a drive circuit. Is.

That is, conventionally, in the area other than the image display area 71, the transparent electrode is provided only on one of the substrates 11 and 12. Therefore, in this region, the distance between the substrates 11 and 12 is wider than that of the image display region 71 in which the transparent electrodes are provided so as to face each other, and a difference occurs in the threshold voltage between the central portion and the peripheral portion of the screen, and There is a problem that a contrast difference occurs on the screen and the display color tone changes. In order to solve this problem, in this technique, the transparent electrode 72 facing the area other than the image display area is provided. Further, as is apparent from the figure, the drive circuit of this liquid crystal display device is a circuit for outputting V ₅ and V ₆ to V ₇ in response to “1” and “0” of the alternating signal M inputted. Have a configuration.

[0010]

The inventors of the present invention have found that the non-display transparent electrode 72 other than the image display region 71 and the display transparent electrode in the image display region 71 adjacent to the non-display transparent electrode 72 (here (Not shown), when the potential difference between the display and the transparent electrode becomes large enough to disturb the alignment of the liquid crystal in that part, or compared to the capacitance between the display transparent electrode and the non-display transparent electrode, the non-display It was found that if the electrostatic capacity of the transparent electrode itself was not sufficiently small, the transparent electrode in that part would abnormally light up.

To prevent this, the above-mentioned JP-A-4-81
With the drive circuit configuration of the technique described in Japanese Patent No. 887,
If an X electrode non-selection voltage is applied to the non-display transparent electrodes 72 other than the image display area 71 so that no voltage is applied between the transparent electrodes facing each other in the area, the non-display transparent electrodes other than the image display area 71 are transparent. Since the potential difference between the electrode 72 and the adjacent display transparent electrode can be reduced at the same time, the problem of abnormal lighting can be solved. However, this technique requires a circuit for generating a voltage obtained by converting the X electrode non-selection voltage into an alternating current and a circuit for supplying this voltage to the non-display transparent electrode 72 as shown by reference numeral 73 in FIG.

The non-display transparent electrode is shown in FIG.
It is not limited to the non-display transparent electrode 72 for adjusting the distance between the substrates 11 and 12 shown in FIG. That is, since the leading wiring of the display transparent electrode connected to the output terminal of the TCP is formed in the diagonal direction, and the leading wirings of the adjoining TCPs are wide in a triangular shape, a portion where the leading wiring is present. Triangular display unevenness (contrast unevenness) occurs in the non-existing portion.Therefore, in order to prevent the electrodes from being seen, a transparent electrode for preventing the electrodes from seeing in a triangular pattern (Fig. (See reference numeral 67 of 2)
Was provided. The above problem similarly occurs in the case of such a transparent electrode for preventing electrode visibility.

An object of the present invention is to provide a liquid crystal display device capable of preventing the abnormal lighting without providing the above circuit.

[0014]

In order to achieve the above object, the present invention mounts a liquid crystal driving semiconductor IC chip by a time division driving system, and electrically connects a liquid crystal display element and a driving circuit board. In a liquid crystal display device including a TCP, one of two input non-selection voltages is output as an output for an input alternating signal "1", and the input alternating signal "0" is output. On the other hand, the TCP is provided with at least one output terminal that outputs the other of the two unselected voltages that are input and alternately outputs one of the two unselected voltages according to the alternating signal. Provided is a liquid crystal display device in which the output terminal is connected to a non-display transparent electrode of the liquid crystal display element.

[0015]

In the liquid crystal display device of the present invention, since the output terminal of the TCP that constantly outputs the non-selection voltage is connected to the non-display transparent electrode other than the image display area as described above, the non-display transparent electrode is not selected. The voltage can be constantly supplied. Therefore, the voltage applied between the non-display transparent electrode and the adjacent display transparent electrode can be made equal to or less than the difference between the selection voltage and the non-selection voltage, so that the abnormal lighting of these transparent electrodes can be prevented. it can. Further, since the liquid crystal driving IC chip constantly outputs the non-selection voltage to the output terminal, the TCP input side is not required for other than normal display, and the generation and supply of the alternating non-selection voltage can be performed. No circuit configuration is required.

[0016]

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

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

Reference numeral 1 is TCP, 65 is a base film of TCP1, 34 is a liquid crystal driving semiconductor I mounted on TCP1.
C chip, 4 is a display input terminal of TCP1, 3 is a display output terminal, and 2 is a non-display output terminal.

FIG. 2 is a partial plan view of the liquid crystal display element of the liquid crystal display device of one embodiment of the present invention to which the TCP of FIG. 1 is connected. It should be noted that FIG. 1 is schematically drawn, and TC of FIG.
The number of terminals of P does not match that of FIG.

62 is a liquid crystal display element (see FIG. 11), 11
Is an upper electrode substrate, 12 is a lower electrode substrate, 66 is both substrates 11,
12, a transparent electrode for display of the liquid crystal display element 62 formed so as to face 12; 67, a non-display transparent electrode for preventing the visibility of electrodes in a triangular pattern; and 68, a non-display for preventing the visibility of electrodes in a trapezoidal pattern. Transparent electrode, 69 is a display input terminal of the liquid crystal display element 62 to which the TCP display output terminal (reference numeral 3 in FIG. 1) is connected, and 70 is a TCP non-display output terminal (reference numeral 2 in FIG. 1). It is a non-display input terminal of the connected liquid crystal display element 62.

FIG. 3 is a circuit configuration of a liquid crystal driving semiconductor IC chip and a liquid crystal display element according to an embodiment of the present invention (FIG. 14).
FIG. 7 is a diagram showing a portion corresponding to the conventional circuit configuration of FIG. The circuit as shown in this figure supplies the liquid crystal drive voltage necessary for the liquid crystal display device of the present invention based on the known voltage averaging method.

The display input terminal 4 of the TCP 1 of FIG. 1 is connected to the output terminal of the printed circuit board (see reference numeral 35 in FIG. 11), and a signal necessary for display is input from the printed circuit board. The display output terminal 3 of the TCP1 is connected to the display input terminal 69 connected to the display transparent electrode 66 in the image display area of the liquid crystal display element 62 of FIG. The non-display output terminal 2 of the TCP 1 is connected to the non-display input terminal 70 of the non-display transparent electrodes 67 and 68 for preventing electrode visibility other than the image display area. The non-display output terminal 2 connected to the non-display transparent electrodes 67 and 68 via the non-display input terminal 70 is
2 for the input "1" of the alternating signal
One of the two non-selection voltages is output, and the other of the two non-selection voltages that are input is output with respect to “0” of the alternating current signal that is input. One of them is alternately output by the alternating signal. Therefore, the display voltage is supplied to the display transparent electrode 66 from the display output terminal 3 of the TCP 1, and at the same time, the non-selection voltage is supplied to the non-display transparent electrodes 67 and 68 from the display output terminal 2 of the TCP 1. It

In the liquid crystal display device of this embodiment, since the non-display output terminal 2 of the TCP 1 that constantly outputs the non-selection voltage is connected to the non-display transparent electrodes 67 and 68 outside the image display area, A non-selection voltage (off output) can be constantly supplied to the display transparent electrodes 67 and 68. Therefore, the voltage applied between the non-display transparent electrodes 67 and 68 and the leading wiring of the adjacent display transparent electrode 66 can be made equal to or less than the difference between the selection voltage and the non-selection voltage. Abnormal lighting can be prevented. That is, the voltage of the non-display transparent electrodes 67 and 68 can be held at a non-selection voltage that causes no problems in display and circuit operation. Further, as compared with the case where the conventional non-display transparent electrode is electrically floated, the evaluation of the capacitance, that is, the measurement and the calculation are unnecessary. Further, since the liquid crystal driving IC chip 34 constantly outputs the non-selection voltage to the non-display output terminal 2 of the TCP1, the input side of the TCP1 does not need to be any other than the normal display input terminal 4, and therefore, FIG. As is apparent by comparing the circuit of FIG. 14 with the circuit of FIG. 14, the conventional circuit configuration for generating and supplying the non-selection voltage that has been converted into an alternating current and is shown by reference numeral 73 in FIG.

FIG. 4 shows an arrangement direction (for example, rubbing direction) of liquid crystal molecules on an electrode substrate, a twisting direction of liquid crystal molecules, and a polarization axis (or absorption axis) of a polarizing plate when the liquid crystal display element 62 according to the present invention is viewed from above. The (axial) direction and the optical axis direction of the member that brings about the birefringence effect are shown, and FIG. 5 is a perspective view of a main part of the liquid crystal display element 62 according to the present invention.

Twisting direction 10 of liquid crystal molecules and twist angle θ
Is a rubbing direction 6 of the alignment film 21 on the upper electrode substrate 11, a rubbing direction 7 of the alignment film 22 on the lower electrode substrate 12, and a positive dielectric anisotropy sandwiched between the upper electrode substrate 11 and the lower electrode substrate 12. It is defined by the type and amount of the optical rotatory substance added to the nematic liquid crystal layer 50 having the property.

In FIG. 5, in order to align the liquid crystal molecules between the upper and lower electrode substrates 11 and 12 sandwiching the liquid crystal layer 50 so as to form a twisted spiral structure, a transparent upper layer made of, for example, glass is used. The rubbing method, which is a method of rubbing the surfaces of the alignment films 21 and 22 made of an organic polymer resin made of polyimide, for example, in contact with the liquid crystal on the lower electrode substrates 11 and 12 with a cloth in one direction, is used. ing. The rubbing direction at this time, that is, the rubbing direction, the rubbing direction 6 in the upper electrode substrate 11, and the rubbing direction 7 in the lower electrode substrate 12 are the alignment directions of the liquid crystal molecules. The two upper and lower electrode substrates 1 that have been oriented in this way
1 and 12 are made to face each other with a gap d ₁ so that the rubbing directions 6 and 7 intersect each other at approximately 180 to 360 degrees, and the two electrode substrates 11 and 12 are notched for injecting liquid crystal. When a nematic liquid crystal having a positive dielectric anisotropy and having a predetermined amount of an optical rotatory substance is sealed in by adhering with a frame-shaped sealant 52 having a portion 51,
The liquid crystal molecules have a helical molecular arrangement with a twist angle θ in the figure between the electrode substrates. Reference numerals 31 and 32 are transparent upper and lower electrodes made of, for example, indium oxide or ITO (Indium Tin Oxide). A member that produces a birefringence effect on the upper electrode substrate 11 of the liquid crystal cell 60 thus configured (hereinafter referred to as a birefringence member. Fujimura et al., "ST
N-LCD retardation film ", magazine electronic material 1991
(February issue, pages 37-41) 40, and upper and lower polarizing plates 15 and 16 with the member 40 and the liquid crystal cell 60 sandwiched therebetween.

The twist angle θ of the liquid crystal molecules in the liquid crystal 50 can take a value in the range of 180 ° to 360 °, preferably 200 ° to 300 °, but the transmittance-applied voltage curve is turned on near the threshold value. From the practical viewpoint of avoiding the phenomenon that the state becomes an orientation that scatters light and maintaining excellent time division characteristics, the range of 230 to 270 degrees is more preferable. This condition basically makes the response of the liquid crystal molecules to the voltage more sensitive and acts to realize excellent time division characteristics. In order to obtain excellent display quality and the refractive index anisotropy [Delta] n ₁ of the liquid crystal layer 50 a product [Delta] n ₁ of the thickness d ₁
-D ₁ is preferably set in the range of 0.5 μm to 1.0 μm, more preferably 0.6 μm to 0.9 μm.

The birefringent member 40 acts so as to modulate the polarization state of light passing through the liquid crystal cell 60, and converts what could be colored display by the liquid crystal cell 60 alone into black and white display. Thus the birefringent member 40 refractive index anisotropy [Delta] n ₂ and is extremely important product [Delta] n ₂ · d ₂ of a thickness d _2, preferably 0.8μm from 0.4 .mu.m, more preferably 0.5μm To 0.7 μm.

Further, since the liquid crystal display element 62 according to the present invention utilizes the elliptically polarized light due to the birefringence, the polarizing plate 15,
When the uniaxial transparent birefringent plate is used as the birefringent member 40, the relationship between the 16 axes and the liquid crystal alignment directions 6 and 7 of the electrode substrates 11 and 12 of the liquid crystal cell 60 is extremely important. .

The function and effect of the above relationship will be described with reference to FIG. FIG. 4 shows an axis of a polarizing plate, an optical axis of a uniaxial transparent birefringent member when the liquid crystal display device having the configuration of FIG. 5 is viewed from above,
3 shows the relationship between the alignment directions of liquid crystal molecule axes of an electrode substrate of a liquid crystal cell.

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

Here, how to measure the angles α, β, and γ in this specification will be defined. In FIG. 9, the intersection angle between the optical axis 5 of the birefringent member 40 and the liquid crystal alignment direction 6 of the upper electrode substrate will be described as an example. The intersection angle between the optical axis 5 and the liquid crystal alignment direction 6 is shown in FIG.
As shown in FIG. ₂ , it can be represented by φ ₁ and φ ₂ , but in the present specification, the smaller corner of φ ₁ and φ ₂ is adopted. That is, since φ ₁ <φ ₂ in FIG. 9A, φ ₁ is defined as an intersection angle α between the optical axis 5 and the liquid crystal alignment direction 6,
Since φ ₁ > φ ₂ in FIG. 9B, φ ₂ is defined as an intersection angle α between the optical axis 5 and the liquid crystal alignment direction 6. Of course, either one may be adopted when φ ₁ = φ ₂ .

In the liquid crystal display device according to the present invention, the angles α, β and γ are extremely important.

The angle α is preferably 50 to 90 degrees, more preferably 70 to 90 degrees, the angle β is preferably 20 to 70 degrees, more preferably 30 to 60 degrees, and the angle γ is preferably. It is desirable to set each to 0 to 70 degrees, and more preferably to 0 to 50 degrees.

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

In FIG. 5, the birefringent member 40 is disposed between the upper polarizing plate 15 and the upper electrode substrate 11, but instead of this position, the lower electrode substrate 12 and the lower polarizing plate 16 are provided.
It may be disposed between and. This case corresponds to the case where the entire configuration of FIG. 5 is inverted.

FIG. 6 is a diagram showing a specific example of the twist angle θ and the like. As shown in the figure, the twist angle θ of the liquid crystal molecules is 240 degrees, and as the uniaxial transparent birefringent member 40, a liquid crystal cell having a parallel orientation (homogeneous orientation), that is, a twist angle of 0 degree was used. Here, the thickness d (μm) of the liquid crystal layer and the helical pitch p (μ of the liquid crystal material added with the optical rotatory substance)
The ratio d / p of m) was set to 0.67. Alignment films 21 and 22
Was used, which was formed of a polyimide resin film and rubbed. The tilt angle (pretilt angle) at which the alignment film subjected to the rubbing process causes the liquid crystal molecules in contact with the alignment film to be tilted with respect to the substrate surface is 4 degrees. The Δn ₂ · d ₂ of the uniaxial transparent birefringent member 40 is about 0.6 μm. On the other hand, Δn ₁ · of the liquid crystal layer 50 in which the liquid crystal molecules are twisted by 240 degrees
d ₁ is about 0.8 μm.

At this time, by setting the angle α to about 90 degrees, the angle β to about 30 degrees, and the angle γ to about 30 degrees, the voltage applied to the liquid crystal layer 50 via the upper and lower electrodes 31 and 32 is increased. When the voltage is below the threshold value, light non-transmission, that is, black display, and when the voltage exceeds a threshold value, light transmission, that is, white and black display, can be realized. In addition, the axis of the lower polarizing plate 16 is 50
When rotated 90 degrees from 90 degrees, white display was realized when the voltage applied to the liquid crystal layer 50 was below the threshold value, and black when the voltage was above the threshold value, which was the reverse of the above.

FIG. 7 shows changes in contrast during time-division driving at 1/200 duty when the angle α is changed in the configuration of FIG. Although the contrast was extremely high when the angle α was in the vicinity of 90 degrees, the contrast decreased as the angle deviated. Moreover, when the angle α is small, both the lighting part and the non-lighting part are bluish, and when the angle α is large, the non-lighting part is purple and the lighting part is yellow, and in any case black and white display is impossible. Similar results are obtained for the angle β and the angle γ, but in the case of the angle γ, as described above, when the image is rotated from 50 degrees to 90 degrees, the black and white display is reversed.

FIG. 8 is a diagram showing another specific example of the twist angle θ and the like. The basic structure is the same as the specific example shown in FIG.
However, the twist angle of the liquid crystal molecules of the liquid crystal layer 50 is 260 degrees,
The difference is that Δn ₁ · d ₁ is about 0.65 μm to 0.75 μm. The Δn ₂ · d ₂ of the parallel alignment liquid crystal layer used as the uniaxial transparent birefringent member 40 is about 0.58 μm, which is the same as the specific example.
m. The ratio between the thickness d ₁ (μm) of the liquid crystal layer and the helical pitch p (μm) of the nematic liquid crystal material added with the optical rotatory substance was set to d / p = 0.72.

At this time, by setting the angle α to about 100 degrees, the angle β to about 35 degrees, and the angle γ to about 15 degrees, the black and white display similar to the concrete example can be realized. Further, the reverse black-and-white display is possible by rotating the position of the axis of the lower polarizing plate by 50 to 90 degrees from the above value, which is almost the same as the specific example. The tendency with respect to the deviations of the angles α, β, and γ is almost the same as in the specific example.

In each of the specific examples described above, a parallel alignment liquid crystal cell having no twist of liquid crystal molecules is used as the uniaxial transparent birefringent member 40, but rather a liquid crystal layer in which liquid crystal molecules are twisted by about 20 to 60 degrees is used. There is less color change depending on the angle. Like the above-mentioned liquid crystal layer 50, this twisted liquid crystal layer is formed by sandwiching liquid crystal between a pair of transparent substrates that have been subjected to the alignment treatment so that the alignment treatment directions intersect a predetermined twist angle. It In this case, the bisected angle of the two orientation treatment directions sandwiching the twisted structure of the liquid crystal molecules may be treated as the optical axis of the birefringent member. A transparent polymer film may be used as the birefringent member 40 (uniaxially stretched film is preferable at this time). In this case, PET (polyethylene terephthalate), acrylic resin film and polycarbonate are effective as the polymer film.

Further, although the single birefringent member is used in the above-described embodiments, in addition to the birefringent member 40 in FIG. 5, another birefringent member is provided between the lower electrode substrate 12 and the lower polarizing plate 16. It is also possible to insert a bending member. In this case, Δn ₂ · d ₂ of these birefringent members should be readjusted.

However, as shown in FIG. 10, the upper electrode substrate 1
Red, green, and blue color filters 33R, 33G, 3 on top of 1
By providing the light shielding film 33D between the filters 3B and the respective filters, multicolor display is possible. FIG. 8 shows an arrangement direction of liquid crystal molecules in another specific example, a twisting direction of liquid crystal molecules,
The relationship between the axis direction of the polarizing plate and the optical axis of the birefringent member is shown.

In FIG. 10, each filter 33
On the R, 33G, 33B and the light shielding film 33D, a smoothing layer 23 made of an insulating material is formed in order to reduce the influence of these irregularities, and then an upper electrode 31 and an alignment film 21 are formed.

FIG. 11 is an exploded perspective view showing a liquid crystal display element 62, a drive circuit for driving the liquid crystal display element 62, and a liquid crystal display module 63 in which a light source is compactly integrated. Semiconductor I for driving liquid crystal display element 62
The C chip 34 has a configuration as shown in FIG. 1 and is mounted on a frame-shaped printed board 35 having a window portion for fitting the liquid crystal display element 62 in the center. That is, TCP
Reference numeral 1 designates an output terminal (not shown here, reference numeral 2 in FIG. 1) for always outputting a non-selection voltage, and a non-display transparent electrode (not shown here in FIG. 1) of the liquid crystal display element 62. Reference numerals 67 and 68 in FIG. )
Since it is connected to, the abnormal lighting of the transparent electrode can be prevented as described above. The printed circuit board 35 in which the liquid crystal display element 62 is fitted is fitted in the window portion of the frame-like body 42 formed by plastic molding, and the metal frame 4 is inserted therein.
The frame 41 is fixed to the frame-like body 42 by stacking 1 and folding the claw 43 into the notch 44 formed in the frame-like body 42.

A cold cathode fluorescent lamp 36 disposed at the upper and lower ends of the liquid crystal display element 62, a light guide 37 made of an acrylic plate for uniformly irradiating the liquid crystal display cell 60 with light from the cold cathode fluorescent lamp 36, A reflecting plate 38 formed by applying white paint to a metal plate and a milky white diffusing plate 39 for diffusing light from the light guide 37 are fitted into the window portion from the back side of the frame-shaped body 42 in the order of FIG. Be done. An inverter power supply circuit (not shown) for lighting the cold cathode fluorescent lamp 36 is provided with a recess (not shown) provided on the right side rear portion of the frame-shaped body 42. The recess 4 of the reflection plate 38 is provided.
It is located at a position facing No. 5. ). Diffuser 3
9, light guide 37, cold cathode fluorescent lamp 36, and reflector 38
Attaches the tongue piece 46 provided on the reflection plate 38 to the frame-shaped body 42.
It is fixed by bending it in the small edge 47 provided in the.

FIG. 12 is a block diagram of a laptop personal computer using the liquid crystal display module 63 for the display portion, and FIG. 13 is a diagram showing a state in which the liquid crystal display module 63 is mounted on the laptop personal computer 64. In this laptop personal computer 64, the microprocessor 4
The liquid crystal display module 63 is driven by the liquid crystal driving semiconductor IC chip 34 via the control LSI 48 based on the result calculated in 9.

As described above, according to the above specific example, it is possible to realize a field effect liquid crystal display device having excellent time-division driving characteristics and capable of monochrome and multicolor display.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. . For example, in the embodiment shown in FIGS. 1 to 3, the non-display output terminal 2 of the TCP 1 of FIG.
14 shows an example in which the non-display transparent electrodes 67 and 68 for preventing electrode visibility of the liquid crystal display element 62 of FIG. 2 are connected.
It is also possible to connect to the non-display transparent electrode 72 for controlling the gap between the two substrates 11 and 12 provided in the non-display area other than the image display area 71 as shown in FIG. Can be held at.

[0051]

As described above, according to the liquid crystal display device of the present invention, the voltage of the non-display transparent electrode is always set to the non-selection voltage without providing a circuit for generating and supplying an alternating non-selection voltage. This can be maintained and the voltage of the non-display transparent electrode of the liquid crystal display element can be prevented from adversely affecting the display.

[Brief description of drawings]

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

FIG. 2 is a partial plan view of a liquid crystal display device of one embodiment of the present invention to which the TCP of FIG. 1 is connected.

FIG. 3 is a diagram showing a circuit configuration of a liquid crystal driving semiconductor IC chip and a liquid crystal display element according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an example of a relationship among an alignment direction of liquid crystal molecules, a twisting direction of liquid crystal molecules, a direction of an axis of a polarizing plate, and an optical axis of a birefringent member in a liquid crystal display device to which the present invention is applicable. .

FIG. 5 is an exploded perspective view of a main part of an example of a liquid crystal display element.

FIG. 6 is an explanatory diagram showing the relationship between the twist direction of liquid crystal molecules, the direction of the axis of the polarizing plate, and the optical axis of the birefringent member in another liquid crystal display element.

FIG. 7 is a contrast of the liquid crystal display element of FIG.
It is a graph which shows a transmitted light color-crossing angle alpha characteristic.

FIG. 8 is an explanatory diagram showing a relationship among an alignment direction of liquid crystal molecules, a twisting direction of liquid crystal molecules, a direction of an axis of a polarizing plate, and an optical axis of a birefringent member in another liquid crystal display element.

FIG. 9 is a diagram for explaining how to measure intersection angles α, β, and γ.

FIG. 10 is a partially cutaway perspective view of an example of an upper electrode substrate portion of a liquid crystal display element.

FIG. 11 is an exploded perspective view of an example of a liquid crystal display module.

FIG. 12 is a block diagram of an example of a laptop computer.

FIG. 13 is a perspective view of an example of a laptop computer.

FIG. 14 is a diagram showing a configuration including a drive circuit of a conventional liquid crystal display device.

[Explanation of symbols]

1 ... TCP, 2 ... TCP non-display output terminal, 3 ... TC
P display output terminal, 4 ... TCP display input terminal, 1
DESCRIPTION OF SYMBOLS 1 ... Upper electrode substrate, 12 ... Lower electrode substrate, 34 ... Liquid crystal driving semiconductor IC chip, 62 ... Liquid crystal display element, 65 ... Base film, 66 ... Display transparent electrode, 67, 68 ... Non-display transparent electrode, 69 ... Display input terminal of liquid crystal display element, 7
0 ... Non-display input terminal of liquid crystal display element.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Suzuki 3300 Hayano, Mobara, Chiba Prefecture, Hitachi, Ltd. Electronic Device Division (72) Inventor Tomohide Ohira 3300 Hayano, Mobara, Chiba Hitachi, Ltd. Electronic Device Business (72) Inventor Ken Saito 3300 Hayano, Mobara-shi, Chiba Hitachi, Ltd. Electronic Device Division

Claims (1)

[Claims] 1. A liquid crystal driving semiconductor I according to a time division driving method.
In a liquid crystal display device including a C chip and including a TCP that electrically connects a liquid crystal display element and a drive circuit board, two input signals are input in response to an alternating signal "1". One of the two non-selection voltages is output, and the other of the two non-selection voltages that are input is output with respect to “0” of the alternating signal that is input, and one of the two non-selection voltages is output. At least one that is output alternately by the alternating signal
The liquid crystal display device, wherein the TCP has a plurality of output terminals, and the output terminals are connected to a non-display transparent electrode of the liquid crystal display element.