JP3185265B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid crystal driving device and an arrangement of the liquid crystal driving device in a liquid crystal display device.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, as shown in FIG. 4, output terminals 7 corresponding to respective liquid crystal driving elements are arranged parallel to four sides of a semiconductor device, and a power supply terminal 8 and a control terminal 9 are arranged on one side. And a plurality of liquid crystal driving devices.

[0003]

However, in the above-mentioned prior art, the wiring from the output terminal of the liquid crystal driving device to the electrode on the liquid crystal sealing glass is long, and it is difficult to pattern the COF (chip on flexible) and the substrate. There is a problem that a large area is required. In addition, there is a problem that wiring of power supply wiring to each liquid crystal driving device is complicated, wiring resistance is increased, for example, through a through hole between multilayer wirings, and the driving capability of the driving element is affected.

Therefore, the present invention solves these problems and provides a liquid crystal display device with a smaller parting area, and reduces the power supply wiring resistance and makes the power supply wiring resistance uniform to achieve a higher quality liquid crystal display. The purpose is to gain.

[0005]

A liquid crystal display device according to the present invention is a display device including a liquid crystal element, and a liquid crystal driving device for driving the liquid crystal device, wherein a plurality of driving means for generating a driving signal for the liquid crystal element are provided. An element, a plurality of output terminals for outputting the generated drive signal, a plurality of control terminals to which a control signal for controlling operation of the drive element is supplied, and a first drive voltage for the liquid crystal element. First and second power supply terminals, and third and second power supply terminals to which a second drive voltage for the liquid crystal element is supplied.
A liquid crystal driving device including a fourth power supply terminal;
A first power supply line connected to a second power supply terminal to supply the first drive voltage; and a second power supply line connected to the third and fourth power supply terminals to supply the second drive voltage. Power line,
Wherein the planar shape of the liquid crystal driving device is substantially rectangular, the output terminal is disposed on a first long side of the liquid crystal driving device, and the first and third power terminals are , Disposed on a first short side of the liquid crystal driving device;
The second and fourth power terminals are connected to a second terminal of the liquid crystal driving device.
, The control terminal is disposed on a second long side of the liquid crystal driving device, and the first and second power lines are connected to the first and second power lines near the liquid crystal driving device. Second
, And the first to fourth power supply terminals are not disposed on the first and second long sides.

[0006]

FIG. 1 is a structural view of a liquid crystal display device according to an embodiment of the present invention. The liquid crystal display device is constituted by using a flexible tape. 1 is a liquid crystal driving device, 2 is a flexible tape on which the liquid crystal driving device is mounted, 3 is a substrate on which a flexible table is fixedly wired, 4 and 5 are liquid crystal sealing glasses on which transparent electrodes are patterned, and 6 is a liquid crystal display area. The liquid crystal drive output electrode of the flexible tape is connected to the transparent electrode of the liquid crystal sealing glass. FIG. 2 is a layout diagram of input / output terminals of a liquid crystal driving device used in the liquid crystal display device of the present invention. Reference numeral 10 denotes a liquid crystal driving element, 7 denotes an output terminal of the liquid crystal display element, 8 denotes a liquid crystal driving power supply terminal, and 9 denotes a liquid crystal driving element control terminal. Output terminal on one long side of LCD drive
7 and a control terminal 9 on one side of the other long side, and each liquid crystal drive power supply terminal 8 for supplying the same voltage value is disposed on both short sides or on the long side so as to sandwich the control terminal. Two or more are each arranged. FIG. 3 is a diagram in which the liquid crystal driving device is mounted on a flexible tape and connected to a substrate. Reference numeral 2 denotes a flexible tape, 14 denotes a power electrode drawn from a power terminal 8, 1 denotes a liquid crystal driving device, 15 denotes a control electrode drawn from the control terminal 9, and 11 denotes an output electrode drawn from the output terminal 7. Reference numeral 3 denotes a substrate on which a flexible tape is fixedly wired, 12 denotes a power supply line on the substrate, and 13 denotes a control electrode on the substrate, which is connected to a control electrode 15 of the flexible tape. The wiring from the output terminal 7 to the output electrode 11 is routed without being routed on the flexible tape, and the wiring area is very small. The power supply electrodes 14 are drawn out from the liquid crystal drive power supply terminals 8 located on both short sides of the liquid crystal display device, and are formed in the longitudinal direction of the flexible tape.

[0007] When driving the matrix liquid crystal display device, the peripheral crystal panel disposing a liquid crystal driving device, but the wiring region of the driving device and a liquid crystal panel is used in the parting regions (mainly wiring of the liquid crystal display device, (A region that does not contribute to display). Information devices using a liquid crystal display device tend to be smaller and thinner, and it is necessary to make the parting-out area smaller as the display area becomes smaller. When a liquid crystal driving device that outputs liquid crystal driving from four directions as in the past is used, the wiring to the transparent electrode on the liquid crystal sealing glass is large, the width of the liquid crystal driving device is large, and the parting area is small. Did not get smaller.

A liquid crystal encapsulating glass is provided by arranging an elongated liquid crystal driving device having a liquid crystal driving output terminal on one long side such that the long side of the liquid crystal driving device and one side of the liquid crystal display area are parallel to each other. The area in which the wiring is extended to the upper electrode is reduced, and the width of the liquid crystal driving device is also reduced, so that a liquid crystal display device having a smaller parting area can be realized.
As a method of mounting the liquid crystal display device, there is a method of bending the flexible tape on which the liquid crystal drive device is mounted to reduce the parting area, but the type in which the backlight is mounted on the liquid crystal drive device increases the thickness and makes it difficult to reduce the thickness. Would.

The effects of the liquid crystal display device of the present invention will be examined from the viewpoint of display quality. The liquid crystal display element has a characteristic of a capacitive load, and a difference in driving ability appears in a rounded driving waveform. This waveform distortion significantly degrade the display quality appear as effective voltage changes display shades that are marked addition to the liquid crystal display element by. As shown in FIG. 3, the power supply electrode 14 on the flexible tape is connected to the power supply wiring 12 on the substrate below the flexible tape at both ends of the flexible tape. Thereby, the power supply wiring 12 of the substrate can be laid out more linearly, and at the same time as the wiring area of the substrate is reduced, the power supply wiring resistance can be reduced without passing through the through holes between the multilayer substrates. According to the liquid crystal display device of the present invention, the driving waveform is not rounded due to the reduction in the resistance of the liquid crystal driving power supply, and a liquid crystal display device with higher image quality which is not affected by the display pattern can be realized.
In addition, since the liquid crystal driving power is supplied from both ends of the liquid crystal driving device, partial degradation of image quality due to a difference in resistance value can be prevented by making the power supply wiring resistance uniform. When a liquid crystal display device is driven by a plurality of liquid crystal driving devices, lowering and equalizing the power supply wiring has a very large effect in reducing the difference in shading of the liquid crystal display unit by the individual liquid crystal driving device. Further, as the size of the screen of the liquid crystal display device increases and the definition thereof increases, the capacitive load of the liquid crystal display element increases, and the effect of the present invention becomes more remarkable.

FIG. 5 is a configuration diagram of a liquid crystal display device in which a liquid crystal driving device is mounted on a substrate and directly connected to electrodes on the substrate or electrodes on a liquid crystal sealing glass by conductive wires. The liquid crystal driving device is directly connected to the substrate 3 and the power supply wiring 1 on the substrate 3
2 is arranged under the liquid crystal driving device. This is COB
This is a mounting method called “chip-on-port”, which can reduce the parting-out area and make the resistance of the liquid crystal driving power supply small and uniform like the present invention shown in FIG. Thus, a large-capacity liquid crystal display device having excellent display quality can be realized.

[0011]

As described above, according to the present invention, output terminals corresponding to a plurality of driving elements for driving a liquid crystal element are arranged on one long side, and a plurality of control terminals for controlling the driving elements are provided. A liquid crystal driving device arranged on one side of the long side, and two or more power supply terminals for supplying a plurality of liquid crystal driving voltages to the driving element on both short sides or on the long side sandwiching the control terminal, By arranging a plurality of liquid crystal driving devices such that the long side of the liquid crystal driving device and one side of the liquid crystal display area are parallel to each other, the lead-out area of the wiring to the electrode on the liquid crystal sealing glass is reduced, and the parting area is small and very thin. A capacitance liquid crystal display device can be realized. In addition, by employing a slender liquid crystal driving device, a wiring area to a power supply or an output terminal in the liquid crystal device can be reduced, and it is easy to increase the number of outputs of the driving element. As a result, a large screen liquid crystal display device can be controlled with a small number of driving devices,
A low-cost liquid crystal display device can be realized by reducing the mounting cost.

Since the liquid crystal driving power can be supplied from both short sides of the liquid crystal driving device, the resistance of the liquid crystal driving power supply wiring can be reduced on the substrate layout, the power supply wiring resistance caused by the liquid crystal driving device can be suppressed as much as possible, and The power supply wiring resistance can be made uniform. Thereby, the quality of the liquid crystal display can be remarkably improved.

When the liquid crystal driving device is mounted on a flexible tape, the liquid crystal driving device is sealed with a resin to protect the liquid crystal driving device. This makes it possible to provide a highly reliable liquid crystal display device that is resistant to cracks and characteristic changes due to stress after mounting.

As described above, the liquid crystal display device of the present invention has a wide variety of excellent effects.

[Brief description of the drawings]

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

FIG. 2 is a layout diagram of a liquid crystal driving device used in the liquid crystal display device of the present invention.

FIG. 3 is a flexible tape of the liquid crystal display device of the present invention;
Board connection diagram.

FIG. 4 is a layout diagram of a liquid crystal driving device used in a conventional liquid crystal display device.

FIG. 5 is a configuration diagram of a liquid crystal display device showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal drive device 2 Flexible tape 3 Substrate 4, 5 Liquid crystal sealing glass 6 Liquid crystal display area 7 Output terminal 8 Liquid crystal drive power supply terminal 9 Control terminal 10 Liquid crystal drive element 11 Output electrode 12 Power supply wiring 13 Control electrode 14 Power supply electrode 15 Control electrode

Claims (1)

(57) [Claims] 1. A display device including a liquid crystal element, a liquid crystal driving device for driving the liquid crystal element, a plurality of driving elements for generating a driving signal for the liquid crystal element, and outputting the generated driving signal. A plurality of output terminals, a plurality of control terminals to which a control signal for controlling operation of the driving element is supplied, a first and a second power supply terminals to which a first driving voltage of the liquid crystal element is supplied, A liquid crystal driving device including a third and a fourth power supply terminal to which a second driving voltage of the liquid crystal element is supplied; and a liquid crystal driving device connected to the first and second power supply terminals to supply the first driving voltage A liquid crystal display device comprising: a first power supply line, and a second power supply line connected to the third and fourth power supply terminals and supplying the second drive voltage. The shape is substantially rectangular, and the output terminal of the liquid crystal driving device is Disposed long sides of 1, the first, third power supply terminal, a first of said liquid crystal driving device
And the second and fourth power supply terminals are connected to the second side of the liquid crystal driving device.
The control terminal is disposed on a second long side of the liquid crystal driving device, and the first and second power supply lines are disposed near the liquid crystal driving device. The liquid crystal is extended so as to be substantially parallel to the second long side, and the first to fourth power terminals are not arranged on the first and second long sides. Display device.