JP3280752B2 - Simple matrix 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 simple matrix liquid crystal display device used for a display screen of a word processor, a notebook computer, a portable device or a device.

[0002]

2. Description of the Related Art In recent years, many simple matrix liquid crystal display devices have been manufactured as portable, thin, and low power consumption display devices. Conventionally, the method of mounting the product used a method using zebra rubber and a method using heat sealing, but in recent years TAB with a liquid crystal drive driver mounted on a film substrate has been used as a signal input terminal of a simple matrix liquid crystal panel. Connect using anisotropic conductive film,
In addition, a system in which a TAB input terminal is connected to a terminal of a printed circuit board for supplying a signal by soldering has become mainstream. This is advantageous in automating the mounting and assembly and making the product thinner and smaller, and is an indispensable mounting method for products requiring a high mounting density, such as a simple matrix color liquid crystal display device.
The TAB is slimmed down in order to reduce the frame size other than the screen and to reduce the cost.

FIG. 5 shows a configuration of a conventional TAB, FIG. 6 shows a configuration of a simple matrix liquid crystal display device, and FIG. 7 shows a configuration of a printed circuit board. 5 is a liquid crystal drive driver 5-2 in which a signal terminal 5-4 including an enable signal output terminal 5-6 is mounted on a film substrate 5-1 having a circuit pattern of one layer.
At the same pitch on the same side at the same pitch and at one place, and in accordance with the signal terminal 5-4, the printed circuit board 6-7.
Are formed and connected by soldering. The printed circuit board 6-7 has two layers, and a lower circuit pattern is formed in a straight line on a layer opposite to the TAB, and a through hole 7-11 is formed for each TAB.
7 connected to the upper circuit pattern and connected to TAB
Connected to -10a and 10b. The plurality of simple matrix liquid crystal drive signal output terminals 5-3 are connected to the plurality of signal input terminals of the simple matrix liquid crystal panel 6-8 via an anisotropic conductive film.

In a simple matrix liquid crystal panel 6-8, a glass substrate on which a plurality of liquid crystal drive scanning signal electrodes 6-12 are formed and a glass substrate on which a plurality of liquid crystal drive data signal electrodes 6-13 are formed are arranged such that the electrodes face each other in a matrix. This is a structure in which a certain gap is held between liquid crystals.

The plurality of liquid crystal drive data signal electrodes 6-1
The TAB connected to 3 inputs a signal to the circuit pattern 7-9 of the printed circuit board 6-7, and first receives the data. The enable input terminal of the signal terminal 6-4 of the TAB of the liquid crystal driving driver 6-2a is the liquid crystal driving driver. Connect to LOW or HI level depending on driver manufacturer. After receiving the data, an enable signal is transmitted from the liquid crystal drive driver 6-2a. The enable signal is supplied from a terminal 7-6a of the connected printed circuit board to an enable signal input terminal of a TAB mounted with a liquid crystal drive driver 6-2b for receiving a next signal, and a circuit pattern 7-5 of the printed circuit board 6-7.
The liquid crystal drive driver 6-2b receives data after receiving the enable signal. The liquid crystal driving drivers 6-2a and 6-2b simultaneously output a plurality of liquid crystal driving data signals in synchronization with the liquid crystal driving scanning signal, and apply the signals to the plurality of liquid crystal driving data signal electrodes 6-13 of the simple matrix liquid crystal panel 6-8. Tell

The plurality of liquid crystal drive scanning signal electrodes 6-12
Since the TAB and the printed circuit board connected to the above have the same configuration as the TAB connected to the plurality of liquid crystal drive data signal electrodes, 6-2a and 6-2b in FIG. 6 are liquid crystal drive drivers that output scanning signals. , 6-13 are scanning signal electrodes, which can be described with reference to FIGS. A liquid crystal driving driver 6-2a that inputs a signal to a circuit pattern 7-9 of a printed board 6-7 and first outputs a liquid crystal driving scanning signal
The frame signal is input to the terminal 7-5a of the printed circuit board connected to the enable input terminal of the TAB on which is mounted, and the liquid crystal drive selection scanning signal is output from the plurality of simple matrix liquid crystal drive signal output terminals one by one in order. At this time, a terminal that does not output the liquid crystal drive selection scanning signal outputs a non-selection scanning signal. The liquid crystal driving scan signal is supplied to the liquid crystal driving driver 6
When all the terminals of the LCD-2a have been output, an enable signal is transmitted from the liquid crystal drive driver 6-2a. The enable signal is connected from the terminal 7-6a of the printed circuit board 7-9 to the terminal 7-5b to the enable signal input terminal of the liquid crystal drive driver 6-2b for outputting the liquid crystal drive scan signal. -2b outputs a liquid crystal drive scanning signal after receiving an enable signal for data and displays a screen in the same manner as the liquid crystal drive driver 6-2a.

[0007]

As described above,
In the conventional arrangement of the input terminals and the enable output terminals of the TAB, in a simple matrix liquid crystal display device in which two or more TABs are mounted on at least one side of a simple matrix liquid crystal panel, a circuit pattern has at least two or more multilayer patterns. If not formed, the input terminal of the TAB, the output terminal of the enable signal and the circuit pattern could not be connected.

[0008]

To solve this problem, a simple matrix liquid crystal display device comprising at least a simple matrix liquid crystal panel and two or more TABs having a liquid crystal drive driver mounted on a film substrate is provided.
B has a plurality of signal input terminals and an enable signal output terminal,
At least two or more sides or blocks are arranged with respect to the outer shape so that the enable signal output terminal and the enable signal input terminal are separated. A plurality of circuit patterns for supplying a drive signal to the TAB are formed on a simple matrix liquid crystal panel or on a printed circuit board without intersecting in one layer.

When a plurality of signal input terminals and enable signal output terminals of the TAB are connected to the circuit pattern with a connection material such as an anisotropic conductive film or solder, a TAB having a liquid crystal drive driver for receiving data at a preceding stage is mounted. By arranging the enable signal output terminal and the enable signal input terminal of the TAB mounted with the liquid crystal drive driver for receiving data next so that they can be connected in the same order to the circuit pattern formed in one layer without crossing, The enable signal output terminal and the enable signal input terminal were connected via the circuit pattern. As a result, the number of circuit pattern layers on the printed circuit board can be reduced as compared with the conventional case, and a single-layer circuit pattern can be used. Further, it is possible to form a circuit pattern without crossing over a substrate on which electrodes of a simple matrix liquid crystal panel are formed.

A signal input terminal formed on two or more sides or blocks of the TAB is provided with a dummy terminal at a position where connection with the terminal of the circuit board is unnecessary to stabilize the connection state. Connection yielded a stable connection yield.

[0011]

As described above, according to the present invention, it is possible to input a signal to the TAB with a minimum circuit board and a single circuit pattern. Further, it becomes possible to form a circuit pattern on a substrate on which electrodes of a simple matrix liquid crystal panel are formed, and if both the liquid crystal drive scanning signal electrode side and the liquid crystal drive data electrode side are used, a printed circuit board is not required at all. I was able to.

[0012]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a TAB of the present invention, FIG. 2 shows the configuration of a simple matrix liquid crystal display device, and FIG. 3 shows the configuration of a circuit pattern. The TAB shown in FIG.
2 is mounted on a one-layer wiring film substrate 1-1.
In the TAB circuit pattern, input signal terminals 1-4a and 1-4b including an enable signal output terminal are provided in two places, and enable signal input terminals 1-5 and enable signal output terminals 1-6 are separately provided. , And are arranged at symmetrical positions. By inputting a signal to this signal terminal, a liquid crystal drive signal is output from the simple matrix liquid crystal drive signal output terminal 1-3. A circuit pattern for supplying a signal to the TAB is a single-layer circuit pattern for each signal formed on the substrate on which the electrodes of the simple matrix liquid crystal panel are formed without crossover. FIG. 2 is a configuration diagram in which an anisotropic conductive film is connected to the circuit pattern.

The plurality of liquid crystal drive data signal electrodes 2-1
3 is input to the cable 2-14 connected to the circuit pattern 3-9, and the enable input terminal of the TAB of the LCD driver 2-2a which receives data first is set to the LOW level by the LCD driver manufacturer. Alternatively, connect to the HI level. After receiving the data, an enable signal is transmitted from the liquid crystal drive driver 2-2a. The enable signal is supplied from a terminal on the connected liquid crystal panel substrate to a liquid crystal drive driver 2 which receives the next signal.
The liquid crystal driver 2-2b is connected to the enable signal input terminal of the TAB on which the -2b is mounted by a circuit pattern 3-15, and then receives data after receiving the enable signal. The liquid crystal driving drivers 2-2a and 2-2b simultaneously output a plurality of liquid crystal driving data signals in synchronization with the liquid crystal driving scanning signal.
-8 to a plurality of liquid crystal drive data signal electrodes 2-13.

The plurality of liquid crystal drive scanning signal electrodes 2-12
Since the TAB and the printed circuit board connected to the same have the same configuration as the TAB connected to the plurality of liquid crystal drive data signal electrodes, 2-2a and 2-2b in FIG. 2 are liquid crystal drive drivers that output signal electrodes. , 2-13 are scanning signal electrodes, which can be explained with reference to FIGS. A liquid crystal driving driver 2 that inputs a signal to a cable 2-14 connected to the circuit pattern 3-9 and first outputs a liquid crystal driving scanning signal
A frame signal is input to the circuit pattern 3-16 connected to the enable input terminal of the TAB on which the -2a is mounted, and a liquid crystal drive selection scanning signal is sequentially output line by line from a plurality of simple matrix liquid crystal drive signal output terminals. At this time, a terminal that does not output the liquid crystal drive selection scanning signal outputs a non-selection scanning signal. When all the terminals of the liquid crystal driving driver 2-2a have output the liquid crystal driving selection scanning signal, an enable signal is transmitted from the liquid crystal driving driver 2-2a. The enable signal is connected to the enable signal input terminal of the liquid crystal drive driver 2-2b for outputting the liquid crystal drive selection scanning signal in a circuit pattern 3-15. The liquid crystal drive driver 2-2b receives the enable signal from the data. After that, similarly to the liquid crystal driving driver 2-2a, the liquid crystal driving scanning signal is output to the liquid crystal driving scanning electrode 2-12 to display the screen.

When a printed circuit board is used as a circuit pattern, the circuit pattern has the same shape as that of the circuit pattern 3-9. In the above description and figures, the number of TAB signal input terminals is reduced for simplicity, but the number is actually 18 or the like. Even if the number is increased, if the enable input terminal and the enable output terminal are arranged separately on different sides, the connection can be made with a single-layer circuit pattern without crossover.

Further, in the above example, a liquid crystal display device having two TABs on both the liquid crystal drive scanning signal side and the liquid crystal drive data signal side has been described. It is the same. The scanning signal side is T
Even in a liquid crystal display device having a combination of one AB and two or more TABs, only the data signal side can be connected using the circuit pattern of the present invention.

In the above example, as shown in FIG. 3, an example in which the circuit pattern is a straight line has been described. However, as shown in FIG. Connection is possible. (Embodiment 2) FIG. 4 shows a TAB embodiment 2 of the wiring position of the present invention.
Is shown.

The input terminals including the TAB enable output terminals are provided with dermy terminals (symbol NC in the drawing) on the left side so that the number of terminals is equal to the number of left and right terminals. Are provided between pin 5 and pin 6, one below pin 5 and two below, and the pitch and line width are aligned to enable enable input terminal 2 and enable output terminal 5
At the same time, the pressure distribution at the time of thermocompression bonding became symmetrical, and the connection yield by the anisotropic conductive film increased.

[0019]

The circuit pattern of the printed circuit board can be wired and connected with one layer, and the cost of the printed circuit board can be reduced. Further, the circuit pattern can be formed on the simple matrix liquid crystal panel without crossover, and the cost can be reduced by eliminating the printed circuit board.

The frame size other than the display screen of the simple matrix liquid crystal display device can be made smaller by arranging the TAB input terminal at a position of 90 degrees with respect to the conventional one. In addition, a product in which a circuit pattern is formed on a simple matrix liquid crystal panel has increased durability against vibration and the like, and has improved reliability compared to the related art. Furthermore, there is no need to connect the TAB to the printed circuit board in the manufacturing process, so that the process can be simplified and the cost can be reduced. However, in some cases, the number of pieces that the glass outer shape of the simple matrix liquid crystal panel becomes larger is reduced, but in the case of a simple matrix color liquid crystal panel using an electrodeposition color filter,
Since the circuit pattern can be formed on the glass substrate facing the electrodeposited terminal portion, it can be manufactured without any problem in the number of pieces to be taken, and the cost can be surely reduced.

[Brief description of the drawings]

FIG. 1 is a terminal arrangement TAB according to a first embodiment.

FIG. 2 is a simple matrix liquid crystal display device of Example 1.

FIG. 3 is a simple matrix liquid crystal panel on which a circuit pattern of Example 1 is formed.

FIG. 4 shows a TAB provided with terminals according to the second embodiment.

FIG. 5 is a conventional terminal arrangement TAB.

FIG. 6 is a prior art simple matrix liquid crystal display device.

FIG. 7 is a printed circuit board on which a conventional circuit pattern is formed.

FIG. 8 is a simple matrix liquid crystal panel on which a circuit pattern according to the first embodiment is formed.

[Explanation of symbols]

1-1, 4-1, 5-1 Film substrate 1-2, 4-2, 5-2 Liquid crystal drive driver 1-3, 4-3, 5-3 Liquid crystal drive signal output terminals 1-4a, 1-4b Signal input terminals including an enable signal output terminal 4-4a, 4-4b Signal input terminals including an enable signal output terminal 5-4, 6-4 Signal input terminals including an enable signal output terminal 1-5, 5-5 Enable signal Input terminal 1-6, 5-6 Enable signal output terminal 2-2a, 6-2a Liquid crystal driving driver 2-2b, 6-2b Liquid crystal driving driver 2-8, 3-8, 6-8 Simple matrix liquid crystal panel 2- 12, 6-12 Liquid crystal drive scanning signal electrode 2-13, 6-13 Liquid crystal drive data signal electrode 2-14 Cable 3-9, 7-9 Circuit pattern 3-15 Enable signal input / output terminal connection pattern 3- 6 Enable signal input terminal connection pattern 6-7, 7-7 Printed circuit board 7-5a Terminal part of circuit pattern connected to enable signal input terminal 7-5b Terminal part of circuit pattern connected to enable signal input terminal 7-6a Enable Terminal part of the circuit pattern connected to the signal input terminal 7-10a Terminal part of the circuit pattern connected to the liquid crystal driving driver 7-10b Terminal part of the circuit pattern connected to the liquid crystal driving driver 7-11 through hole

Claims (2)

(57) [Claims] 1. A simple matrix liquid crystal panel and a film substrate on which at least two TABs each having a liquid crystal drive driver having an enable signal input terminal and an enable signal output terminal separately mounted on at least one side of the terminals of the simple matrix liquid crystal panel are mounted. In the simple matrix liquid crystal display device described above, the TAB has a plurality of signal input terminals and the enable signal output terminal, and at least two or more sides of the outer shape so that the enable signal output terminal and the enable signal input terminal are separated. Or TAB
Are formed on a simple matrix liquid crystal panel or on a printed circuit board without intersecting in a single layer, and a plurality of signal input terminals and enable signal output terminals of the TAB are connected by a connecting material. When connected to the circuit pattern, a TAB enable signal output terminal mounted with a liquid crystal drive driver for latching a liquid crystal drive data signal at the previous stage and an enable signal input terminal of the TAB mounted with a liquid crystal drive driver for receiving data next, or The one layer intersects the enable signal output terminal of the TAB in which the liquid crystal drive driver for outputting the liquid crystal drive scanning signal is mounted in the previous stage and the enable signal input terminal of the TAB in which the liquid crystal drive driver for outputting the liquid crystal drive scan signal is mounted next. Simple connection characterized by being connected by a circuit pattern formed without performing Matrix liquid crystal display device. 2. The method according to claim 1, wherein a dummy terminal is provided on two or more sides of the TAB or on a portion other than a terminal of a circuit pattern connected to a signal input terminal formed in blocks. 2. The simple matrix liquid crystal display device according to 1.