JPH06250198A - Liquid crystal display module - Google Patents

Abstract

PURPOSE:To increase the degree of freedom in designing the patterns of a driving circuit part and to reduce the size of the liquid crystal module by directly forming at least a part of passive elements in a liquid crystal panel and using these passive elements by electrically connecting the elements. CONSTITUTION:The driving circuit part is composed of plural active element groups and the plural passive element groups and at least a part of these passive element groups are disposed on the liquid crystal panel. Transparent electrodes 2 of one electrode substrate are drawn out up to both ends of an insulating substrate 1 and transparent electrodes 2 of the other electrode substrate are drawn out up to the end on one side of the insulating substrate 1. The other end side thereof is provided with a region where the transparent electrodes 2 are not formed. Resistors 3 consisting of the same material as the material of the transparent electrodes 2 are formed in this region. The respective transparent electrodes 2 of this liquid crystal module are electrically connected to a PCB provided with the active element groups for driving the liquid crystal panel. The resistors 3 formed in the region where the transparent electrodes 2 are not drawn out are so connected as to function as the passive elements of the driving circuit part.

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 module, and more particularly to improvement of its drive circuit element.

[0002]

2. Description of the Related Art Liquid crystal display modules have come to be used in various fields such as OA applications, TVs, and vehicle installations in recent years due to their features such as light weight, thinness, and low power consumption. .

Such a liquid crystal display module is a simple matrix type liquid crystal module comprising a liquid crystal panel in which a liquid crystal layer is sandwiched between a pair of electrode substrates having stripe electrodes, and a switching element for each display pixel. Are roughly divided into active matrix liquid crystal modules including a liquid crystal panel.

Each of the simple matrix type and active matrix type liquid crystal display modules includes a liquid crystal panel and a drive circuit board electrically connected to the liquid crystal panel for driving the liquid crystal panel.

Generally, the drive circuit board is a PCB (Printe
A d-Circuit-Board) is provided with a driving circuit element group consisting of a plurality of active element groups and passive element groups, and is connected to a liquid crystal panel by soldering or the like.

[0006]

By the way, in recent years, in order to realize even higher definition display images, there is an increasing demand for multi-gradation display images in liquid crystal modules.

In order to realize such multi-gradation display, it is necessary to supply drive voltages of a plurality of levels to electrodes forming a liquid crystal panel in correspondence with a display image, and conventionally, it is provided on a drive circuit board. Further, the driving voltage is resistively divided into a plurality of levels of the driving voltage by the passive element, that is, the resistance element, and is supplied.

However, the number of active elements or passive elements constituting the drive circuit board is further increasing in accordance with the demand for a complicated and higher display mode, and the drive circuit board becomes large accordingly.

Such an increase in the size of the drive circuit board causes an increase in the area other than the display area of the liquid crystal module as compared with the display area of the liquid crystal module, which is an obstacle to downsizing of the entire liquid crystal display module.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal display module capable of sufficiently increasing the display area in the liquid crystal display module by reducing the size of the drive circuit section. .

[0011]

The present invention comprises a liquid crystal panel having a display area composed of a plurality of display pixels, and a drive circuit section electrically connected to the liquid crystal panel and driving the liquid crystal panel. In the liquid crystal module, the drive circuit unit is configured by a plurality of active element groups and a plurality of passive element groups, and at least a part of the passive element groups is arranged in the liquid crystal panel.

[0012]

According to the present invention, the degree of freedom in designing the drive circuit section can be increased by disposing at least a part of the passive elements constituting the drive circuit section in the liquid crystal panel. Can be made sufficiently small. As a result, the display area of the liquid crystal display module can be made sufficiently large with respect to the overall size. In particular,
By forming the passive element along one side of the liquid crystal panel, it is possible to take out the passive element from any position where it is formed, so that it is possible to further increase the degree of freedom in the pattern design of the PCB, and as a whole. The liquid crystal display module can be miniaturized.

In addition, a passive element may be formed especially outside the display area of the liquid crystal panel, and by utilizing the area which has not been conventionally required and which does not contribute to the display, the size of the liquid crystal display module can be further reduced. Can be achieved.

[0014]

The present invention will be described in detail below with reference to examples. FIG. 1 shows a schematic front view of a liquid crystal panel portion of a liquid crystal display module according to an embodiment of the present invention.

As shown in FIG. 1, this liquid crystal panel comprises an ITO (Indium Tin Oxid) on an insulating substrate 1 made of glass.
A pair of electrode substrates formed with a plurality of stripe-shaped transparent electrodes 2 of e) are arranged so that the respective transparent electrodes 2 face each other at substantially right angles, and two electrodes that are arranged so as to face each other. A liquid crystal layer (not shown) is sandwiched between the substrates via an alignment film (not shown), and a peripheral portion is sealed with a sealant (not shown).

On one of the electrode substrates, the transparent electrode 2 is the insulating substrate 1.
Of the other electrode substrate, the transparent electrode 2 is extended to one end of the insulating substrate 1 and the other electrode substrate is provided with a region where the transparent electrode 2 is not formed. There is. In this embodiment, the same material as that of the transparent electrode 2 is used in the region where the transparent electrode 2 is not formed.
A resistor 3 made of TO is formed.

Although not shown, each transparent electrode 2 of this liquid crystal display module is electrically connected to a PCB provided with a plurality of active element groups for driving a liquid crystal panel at its end. . Further, the resistor 3 formed in the area outside the effective display area of the liquid crystal panel and where the transparent electrode 2 is not drawn out is connected so as to function as a passive element of the drive circuit section.

The resistor 3 is, for example, as shown in FIG. 1 or FIG.
As shown in FIG. 4, the transparent electrode 2 may have a rod-like shape having a certain area extended along one side of the insulating substrate 1 in the non-extracted area, or a rectangular wave shape as shown in FIG. You may form. And, this resistor 3
For example, since it does not need to have a high resistance if it is used to divide the resistance for supplying the liquid crystal driving voltage of a plurality of levels, it can be formed of the same material as the transparent electrode 2 as described above. It can be formed without increasing the number of steps.

The resistor 3 may be made of the same material as the transparent electrode 2 as described above, but a metal film or the like may be used instead. That is, resistor 3
Various materials can be selected depending on the value of the voltage across.

FIG. 5 shows a method of taking out the formed resistor 3 as a resistance element having a predetermined resistance value. It is possible to take out a plurality of levels of voltages V0 to V5 by using the conductive rubber connector 4. it can. In addition, as shown in FIGS. 6 and 7, FPC (Flexible-Printed-Circuit)
5 is also used, a TAB (Tape-Automatic) is formed by arranging a driving IC chip on a flexible support (not shown).
Needless to say, ed-Bonding) film may be used.

According to the above-described embodiment, since the resistor 3 is formed in a rod shape along one side of the liquid crystal panel,
Since it is possible to take out the resistor 3 from any position formed, the degree of freedom in the pattern design of the PCB can be increased, and thus a liquid crystal display module having a display area sufficiently large with respect to the outer shape can be obtained. it can.

In the above-described embodiment, the case where the rod-shaped resistor 3 is formed along one side of the insulating substrate 1 where the transparent electrode 2 is not formed is shown. As described above, the transparent electrode 2 of the insulating substrate 1 may be formed at a corner outside the display area. By forming the resistor 3 in a region which does not contribute to display and which is not necessary in the past, the liquid crystal display module can be further downsized.

Although the above embodiments have been described by taking the simple matrix type liquid crystal display module as an example, it is needless to say that the present invention is not limited to this and can be applied to an active matrix type liquid crystal display module.

[0024]

As described above, according to the present invention, at least a part of the passive element is directly formed on the liquid crystal panel, and the passive element is electrically connected to the liquid crystal panel to be used. The degree of freedom in design can be increased. In addition, since it is possible to take out as a resistance element from any position of the formed resistor, it is possible to increase the degree of freedom in the pattern design of the drive circuit section, and the size of the display area can be adjusted according to the size of the liquid crystal display module. It can be miniaturized.

[Brief description of drawings]

FIG. 1 is a schematic front view of an essential part of an embodiment of the present invention.

FIG. 2 is a schematic view showing an embodiment of the present invention as in FIG.

FIG. 3 is a schematic diagram showing an example of the shape of the resistor of FIGS. 1 and 2.

FIG. 4 is a schematic view showing an example of the shape of the resistor in FIGS. 1 and 2 as in FIG.

5 is a schematic view showing an example of connection of the resistors of FIGS. 1 and 2. FIG.

FIG. 6 is a schematic diagram showing an example of connection of the resistors of FIGS. 1 and 2 similarly to FIG.

FIG. 7 is a schematic view showing an enlarged part A of FIG.

[Explanation of symbols]

 1 ... Substrate 2 ... Transparent electrode 3 ... Resistor

Claims (1)

[Claims] 1. A liquid crystal module comprising: a liquid crystal panel having a display area composed of a plurality of display pixels; and a drive circuit section electrically connected to the liquid crystal panel for driving the liquid crystal panel. Is composed of a plurality of active element groups and a plurality of passive element groups, and at least a part of the passive element groups is disposed in the liquid crystal panel.