JPH1185092A - Electrode driving ic for matrix display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an electrode driving IC by adopting the constitution which is rotationally symmetrically arrayed with output terminal groups for electrode driving, is provided with a unidirectional addressing function and is capable of rotating the electrode driving IC 180 deg. with respect to packaging of a normal position display. SOLUTION: The output terminals T1, T2, T3, T4,..., T237, T238, T239, T240 line up in one row as the output terminal groups for scanning electrode driving in the central part of the scanning electrode driving IC 11 and are arrayed rotationally symmetrically around the center of the scanning electrode driving IC 11 as an axis. Power source terminals VDD, VM, VSS and signal input terminals CK, ST are arranged as terminal groups on the short side part of the upper side of the scanning electrode driving IC 11. The terminals of the same name as the name of the terminals on the upper side are arranged in the short side part on the lower side of the scanning electrode driving IC 11. Further, the addressing function is limited to the one direction to make the circuit simpler and the number of the elements smaller. As a result, the area of the scanning electrode driving IC may be made smaller and comply with the fining of the packaging rule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode driving IC for a matrix type display device, and more particularly to an electrode driving IC for a matrix type display device having an arrangement of output terminals for driving electrodes and a circuit portion. .

[0002]

2. Description of the Related Art A matrix type display device displays images by arranging signal electrodes and scanning electrodes at right angles and selectively applying a voltage (or current). These include those using electroluminescence, electrochromic, fluorescent display, plasma, light emitting diode, liquid crystal, and the like, and generally employ a line sequential driving method. In this method, when the scan electrode drive IC selects a scan electrode, the signal electrode drive IC outputs a waveform corresponding to image data to a pixel on the scan electrode.

The present invention will be described by taking a matrix type liquid crystal display device as an example among the matrix type display devices. At the initial stage of the development of the matrix type liquid crystal display device, the addressing function of the scan electrode driving IC was unidirectional, in which the scan electrodes were selected in order from the top to the bottom of the screen. Similarly, the addressing function of the signal electrode driving IC is a one-way function in which one line of image data is stored in the memory of each output block in order from the output block corresponding to the signal electrode at the left end of the screen. Was.

After that, when the matrix type liquid crystal device becomes widespread, a degree of freedom with respect to a mounting position of the electrode driving IC and a vertical (or left / right) inverted display function are required.
Both the scanning electrode driving IC and the signal electrode driving IC have a bidirectional addressing function.

FIG. 9 shows an addressing circuit using a shift register. 9A is a circuit diagram of a one-way shift register, and FIG. 9B is a circuit diagram of a bidirectional shift register.

In the one-way shift register of FIG. 9A, the same clock signal ck is applied to clock input terminals CK of 240 data type flip-flops (hereinafter referred to as D-FFs) D1, D2,. Is entered,
Except for the first and last D-FFs D1 and D2, the previous D-FF
The output terminal Q of the FF is the data input terminal D of the subsequent D-FF.
Connected to A pulsed start signal st indicating the start of scanning is input to the data input terminal D of D-FF · D1,
In synchronization with the clock signal ck, the D-FFs D1, D2,.
, And the selection pulses are transferred in the order of D240. The D-FFs D1, D2, D3,..., D
239, D240 are connected to the output terminal Q of the electrode 240, and the output blocks B1, B2, B3,.
B240 is addressed.

The bidirectional shift register shown in FIG. 9B has D-FFs D1, D2, D3,..., D239, D24.
0, the selectors S1, S2, S3,..., S24
0 is arranged. Each selector S is controlled by the control signal rl.
1 to 240 select the input terminal B and output terminal Q of the preceding D-FF and input terminal D of the succeeding D-FF via the output terminal O.
Is connected, the start signal st is transferred in the forward direction as in (A). Each selector S1 is controlled by the control signal rl.
When 240 to 240 select the input terminal A and connect the output terminal Q of the succeeding D-FF and the input terminal D of the preceding D-FF via the output terminal O, the start signal st is transferred in the reverse direction to drive the electrode. Output blocks B240, B239,..., B
3, B2 and B1 are addressed in this order.

In the past, we have developed scan electrode drive ICs for inputting power and control signals from the short side (Japanese Patent Application No. Hei 5-23753, Japanese Patent Application No. Hei 6-522977). The mounting substrate was glass, and a connection portion was formed by wiring using a transparent electrode. This scan electrode driving IC is a method of mounting a glass substrate and a connecting portion thereof face to face via a conductive material (hereinafter referred to as C).
OG (chip-on-glass), and an output terminal for driving an electrode was also arranged inside the connection surface for miniaturization. In addition, the power supply terminal and the signal input terminal can be connected from the short side to reduce the size of the glass substrate. Hereinafter, the mounting substrate will be described as a glass substrate, and the mounting method will be described as COG.

FIG. 10 is a schematic diagram showing a connection state between the above-described scan electrode drive IC 101 and a glass substrate, and is a view of the terminal surface of the scan electrode drive IC 101 from the back side of the glass substrate. The scanning electrodes C1, C2, C3 shown by dotted lines,
.., C239 and C240 and scan electrode driving IC 101
, T3, T2, T3,..., T
239 and T240 are respectively connected. On the short side on the upper side of the scan electrode driving IC 101, the power supply terminals VD1, VD
D2, VS2, VS1 and the signal input terminals CK, ST are connected to a transparent electrode (ITO) wiring P101 for connection to an external circuit.
P102, P105, P106, P103, and P104 are connected to each other, and the signal input terminal RL2 is connected to the power supply terminal VS1 by a wiring P107. Note that the scanning electrodes C1 and the like also include wirings connected to the scanning electrodes, but since each wiring is connected to only one scanning electrode in the display screen,
In the following description, it is also referred to as a scanning electrode.

In FIG. 10, a scanning electrode driving IC is provided on the left side of the screen.
This is equivalent to the case where 101 is mounted. Output terminals T1, T
If the selected waveform is output in the order of 2,..., T240, the selected waveform is applied to the scan electrodes C1, C2,. The selection pulse transfer direction of the bidirectional shift register built in the scan electrode drive IC 101 is reversed, and the scan electrodes C240, C2
39,..., C3, C2, and C1 can be selected to display a vertically inverted image. The signal for controlling the transfer direction of the selection pulse of the bidirectional shift register is generated in the scan electrode driving IC 101 using the phase relationship of the signals input to the signal input terminals ST and CK.

When the scan electrode driving IC 101 shown in FIG. 10 is arranged on the right side of the screen, the scan electrodes C1, C2,.
239, C240 and an output terminal T1 for driving the scanning electrode
2, T11,..., T230, T229. In the scan electrode driving IC 101, more selectors are added to the circuit of the bidirectional register of FIG.
The degree of freedom in the transfer direction of the selection pulse is increased. The signal input terminal RL2 is connected to the power supply terminal VDD, and output terminals T12, T11,..., T2, T1, T24,
T23, ..., T228, ..., T218, T217,
The normal screen display is performed by outputting the selected waveform in the order of T240, T239,..., T229. By reversing the selection order, reverse display can be performed. This scan electrode drive IC1
No. 01 achieves both the function for the normal display and the reverse display and the degree of freedom for the left and right mounting directions.

[0012]

The above-described scan electrode drive I
In C, since the connection between the terminal group and the connection portion was secured by a conductive paste, the lower limit value of the pitch between terminals was 150 μm.
It was about. . However, recently, anisotropic conductive films (ACF, anisotropic conductive film) have been used in place of the conductive paste, and the lower limit value of the pitch between terminals has been reduced to about 40 μm. For this reason, a terminal arrangement and a circuit that can utilize the miniaturized mounting rules have been required.

The above-mentioned scan electrode driving IC has been adapted by increasing the circuit scale in order to have versatility in the addressing direction and the mounting position. Therefore, the number of elements has increased and the area of the electrode driving IC has increased. Since this goes against the miniaturized mounting rule, miniaturization of the electrode driving IC has been a problem. On the other hand, there is also a problem that the function of the current electrode driving IC must be maintained. Therefore, an object of the present invention is to provide an electrode driving IC of a matrix type display device which solves these problems.

[0014]

In order to achieve the above-mentioned object, the present invention provides an electrode driving output terminal group in which electrode driving ICs are rotationally symmetrically arranged, and a terminal group arranged on the short side. It has a one-way addressing function, is characterized in that the electrode driving IC is rotated by 180 ° with respect to the mounting of the normal display and mounted on the connection portion of the mounting substrate to perform the inverted display.

[0015]

FIG. 1 is a schematic diagram showing a terminal arrangement of a scan electrode driving IC 11 according to a first embodiment of the present invention. An output terminal T1 as an output terminal group for driving the scan electrode;
T2, T3, T4, ..., T237, T238, T23
9, T240 are arranged in a line at the center of the scan electrode drive IC 11, and are arranged rotationally symmetric about the center of the scan electrode drive IC 11. The power supply terminals VDD, VM, and V are provided as terminal groups on the upper short side of the scan electrode driving IC 11.
SS and signal input terminals CK and ST are arranged. A terminal having the same name as the upper side is disposed on the lower short side of the scan electrode driving IC 11. Those with the same name are scan electrode drive ICs
11 has the same function. Further, the power supply terminals VDD, VM, VSS, and the signal input terminals CK, ST arranged on the short side are also rotationally symmetric with respect to the center of the scan electrode driving IC 11.

FIG. 2 is a circuit diagram of the scan electrode driving IC 11 focusing on the addressing function. FIG.
The circuit is similar to that of FIG. 9A, and the same symbols as those in FIG. 9A indicate the same terminals, signals, and blocks. Output blocks B1 to B24 for driving scan electrodes connected to a one-way shift register
In addition to the selection pulse, a signal df for controlling the polarity of the selection pulse, a power supply vdd which is the highest potential of the selection pulse,
A minimum potential vss of the selection pulse and a power supply vm which is a potential applied to the scan electrode when not selected are also input. The signal df is composed of a start signal st and a clock signal ck.
And the logic level of the power supply vm with respect to the power supplies vdd and vss. Each of the output blocks B1 to 240 has an output terminal T1 for driving a scan electrode.
To 240 to output the scan electrode drive waveform.

FIG. 3 is a schematic diagram when the scanning electrode driving IC 11 of FIG. 1 is mounted on a glass substrate on the left side of the screen. The dotted line indicates the wiring of the transparent electrode on the glass substrate, and is a view of the terminal surface viewed through the glass substrate. Power supply VD
D, VM, VSS, and signal input terminals CK, ST are wirings P31, P33, P
35, P32 and P34.

FIG. 3A shows output terminals T1, T2, T3, T4,..., T237, T238,.
T239 and T240 each have the same number of scan electrodes C
1, C2, C3, C4, ..., C237, C238, C
239, 240, display a normal image.

FIG. 3B shows a scanning electrode driving IC centered on the center.
11 is rotated 180 ° and mounted on a glass substrate. Since the arrangement of the output terminal group for driving the scanning electrode and the other terminal groups are symmetrical with respect to the center, the connection portions of the wirings P31 to P35 and the scanning electrodes C1 to C1 on the same glass substrate as in FIG.
240 can be mounted on the connection part. Output terminal T240,
T239, T238, T237, ..., T4, T3, T
2, T1 and scanning electrodes C1, C2, C3, C4,.
Since 237, C238, C239, and C240 are connected, an image upside down is displayed.

FIG. 4 is a schematic diagram showing a case where the scanning electrode driving IC 11 is mounted on a glass substrate on the right side of the screen. Power supply VD
D, VM, VSS, and input signal terminals CK, ST are wirings P41, P43, P
45, P42 and P44. Since the scanning electrode driving output terminals T1, T2,..., T240 are arranged in a line in the center, the scanning electrode C1,
.., C240, and the display is a normal image. When a vertically inverted image is required, the image is mounted in the same manner as in FIG.

FIG. 5 is a schematic diagram showing a terminal arrangement of the scan electrode drive IC 51 of the second embodiment in a case where the output terminal groups for driving electrodes are arranged alternately. The same symbols as those in FIG. 1 represent equivalent terminals, and the scanning electrode driving IC 51
Are different in the arrangement of the electrode driving output terminal groups T1 to T240. If the number of output terminals is even in a staggered arrangement,
Since the arrangement of the output terminals can be rotationally symmetric, the change of the normal display and the reverse display and the change of the mounting position on the left and right are the same as in the first embodiment.

FIG. 6 shows a scan electrode drive IC 61 according to the third embodiment in which electrode drive output terminal groups are arranged in a matrix and two output terminal rows parallel to a short side are provided. It is a schematic diagram. The same symbols as those in FIG. 1 represent equivalent terminals, and the output terminal groups T1-2 of the scan electrode driving IC 61
There are differences in the 40 sequences. Even in a matrix arrangement, if the number of electrode driving output terminals is arranged rotationally symmetrically, the change between normal display and inverted display is the same as in the first embodiment. In order to make the mounting conditions common on the left and right sides of the screen, it is necessary to keep the pitch in the long side direction of the output terminal row parallel to the short side constant.

FIG. 7 shows a scan electrode drive I according to the fourth embodiment.
It is a schematic diagram which shows C71 and its mounting situation. This scan electrode drive IC 71 is the scan electrode drive IC of the first embodiment.
11, power terminals VDD, VM, VSS on the lower short side
And the signal input terminals CK and ST are removed to shorten the long side. The same symbols as those in FIG. 3 denote the same terminals and wirings as viewed from the back side of the glass substrate when viewing the terminal surface of the scan electrode driving IC 71. FIG. 7A shows an arrangement for displaying a normal image, and includes power supply terminals VDD, VM, and VSS.
The signal input terminals CK and ST are connected to wirings P70, 72, 74, 71 and 73 on the upper part of the glass substrate, respectively. FIG. 7B shows an arrangement for displaying an image upside down, in which power terminals VDD, VM, VSS and signal input terminals CK, ST are connected to wirings P79, P under the glass substrate.
77, P75, P78, and P76. in this case,
Wirings P70 to P79 are prepared in advance on a glass substrate in order to secure the function of turning upside down.

FIG. 8 is a schematic diagram showing a connection state when the scan electrode driving ICs 81 and 82 of the fifth embodiment are connected in cascade.
1, 82 are viewed from the terminal surface. The same symbols as those in FIG. 3 indicate equivalent terminals, wirings, and electrodes. Power supplies vdd, vm, vss and a signal ck, which are supplied from an external circuit,
st (see FIG. 2) is the wiring P80, P8 at the top of the figure.
2, scan electrode driving IC via P84, P81, P83
Input to 81. Compared with the scan electrode drive IC 11 of FIG. 1, the terminal arrangement on the lower side of the scan electrode drive IC 81 is different, and the signal input terminal S on the lower side of the scan electrode drive IC 11 is different.
T is the scanning electrode driving IC of the next stage in the scanning electrode driving IC 81
It has changed to the signal output terminal CO of the carry that starts 82. Power supply terminal V of scan electrode driving ICs 81 and 82
DD, VM, VSS and the signal input terminal CK are connected to a wiring P85,
Since the connection is made by P87, P89 and P86, the power supply vdd, vm, vss and the clock signal ck are the same in the scan electrode driving ICs 81 and 82. Scan electrode drive IC8
1 is connected to the signal input terminal ST of the scan electrode driving IC 82 via the wiring P87, so that the scan electrodes C are sequentially provided immediately after the scan electrode C240 is selected.
241, C242, C243, C244,... Are selected. To change the selection direction, each scan electrode driving IC 81,
82 may be rotated by 180 [deg.], But it is necessary to prepare wiring in advance on the lower side as in the third embodiment of FIG.

The present invention can also be applied to a signal electrode driving IC, and the screen can be horizontally inverted. In addition to the COG mounting, a mounting method such as TAB (tape auto bonding) in which an electrode driving IC and a mounting substrate face each other and are connected to each other can be applied. By using only the one-way addressing function, the circuit can be simplified not only by the shift register but also by the addressing method using the counter and the decoder. Further, the present invention can be applied to not only liquid crystal but also an electrode driving IC of another matrix type display device.

[0026]

As described above, according to the first aspect of the present invention, since the addressing function is limited to one direction, the circuit is simplified and the number of elements is reduced. In line with the miniaturization of Terminal groups other than those for driving the electrodes are arranged on the short side of the electrode driving IC, and the output terminal groups for driving the electrodes are rotationally symmetrically arranged. It can be connected to the upper electrode drive connection.
By selecting the mounting direction in this way, the inverted display function could be maintained. Also, the degree of freedom of the mounting position with respect to the screen was maintained.

According to the second aspect of the present invention, the effect of the first aspect of the present invention is that even if the terminal group disposed on the short side has rotational symmetry, the terminal group is rotated by 180 ° and mounted. This has the added effect that terminals on the short side can be connected while the wiring pattern on the board is shared.

According to a third aspect of the present invention, in addition to the effects of the first aspect, the output blocks in the electrode driving IC are linearly arranged corresponding to the linear arrangement of the output terminals for electrode driving. This makes it easier to design electrode drive ICs.

According to a fourth aspect of the present invention, in addition to the effects of the first aspect of the present invention, the arrangement of the output terminal groups for driving the electrodes is alternated, so that the distance between the terminals can be increased. Is added to the effect.

According to a fifth aspect of the present invention, in addition to the effects of the first aspect of the present invention, the electrode drive IC can be widely used in the plane of the electrode drive IC by the matrix arrangement of the electrode drive output terminals. Can be increased in number.

The invention of claim 6 is obtained by adding the effect of shortening the long side of the electrode drive IC to the effect of the invention of claim 1.

According to the seventh aspect of the invention, the effect of the invention of the first aspect is added to the effect that a large number of electrodes can be driven by cascade connection.

[Brief description of the drawings]

FIG. 1 is a scanning electrode driving IC according to a first embodiment of the present invention;
FIG. 11 is a schematic diagram showing an arrangement of terminals 11;

FIG. 2 is a scan electrode drive IC according to the first embodiment of the present invention;
11 is a circuit diagram mainly illustrating an addressing function of the eleventh embodiment.

FIG. 3 is a scan electrode drive IC according to the first embodiment of the present invention;
11A and 11B are schematic diagrams illustrating a connection state when 11 is mounted on the left side of the screen, in which (A) a normal image is displayed and (B) a vertically inverted image is displayed.

FIG. 4 is a scan electrode driving IC according to the first embodiment of the present invention;
FIG. 11 is a schematic diagram showing a connection state when 11 is mounted on the right side of the screen.

FIG. 5 is a scan electrode drive IC according to a second embodiment of the present invention;
The schematic diagram which shows the terminal arrangement of 51.

FIG. 6 is a scan electrode drive IC according to a third embodiment of the present invention;
The schematic diagram which shows the terminal arrangement of 61.

FIG. 7 shows a scan electrode driving IC according to a fourth embodiment of the present invention.
7A is a schematic diagram illustrating a connection status of 71, (A) when displaying a normal image, and (B) when displaying a vertically inverted image.

FIG. 8 shows a scan electrode driving IC according to a fifth embodiment of the present invention.
The schematic diagram which shows the connection situation at the time of connecting 81 and 82 in tandem.

FIG. 9 is a circuit diagram of a conventional example having an addressing function.
(A) is a one-way shift register, and (B) is a two-way shift register.

FIG. 10 is a schematic diagram showing a conventional scanning electrode driving IC 101 and a connection state thereof.

[Explanation of symbols]

11, 51, 61, 71, 81, 82 Scan electrode drive IC VDD power terminal VM power terminal VSS power terminal CK signal input terminal ST signal input terminal CO signal output terminal T1 to T240 Scan electrode drive output terminals C1 to C244 Scan Electrodes and wiring P31 to P89 Wiring

Claims (7)

[Claims] 1. An electrode driving IC for a matrix type display device in which a connection portion of a mounting board and a terminal surface are superposed face to face and electrically connected to each other, wherein the electrode driving ICs are rotationally symmetrically arranged. Output terminal group, and a terminal group arranged on the short side, and has a unidirectional addressing function,
An electrode drive IC for a matrix type display device, wherein the electrode drive IC is rotated by 180 ° to mount a normal display and mounted on the connection portion to perform inverted display. 2. The matrix according to claim 1, wherein the terminal group arranged on the short side of the electrode driving IC also has rotational symmetry about a common axis with the output terminal group for driving the electrode. Drive IC for a display device. 3. The matrix-type display device according to claim 1, wherein the output terminal group for driving the electrodes is arranged in a line parallel to a long side at a center of the electrode driving IC. Electrode drive IC. 4. The electrode driving IC according to claim 1, wherein the output terminals for driving the electrodes have a staggered arrangement, and the number of terminals included therein is even. . 5. The electrode driving output terminal group has a matrix arrangement, and electrode driving output rows parallel to the short sides are arranged at equal intervals. 1
An electrode drive IC for the matrix type display device according to the above. 6. The electrode driving IC of a matrix type display device according to claim 1, wherein a terminal group arranged on a short side of said electrode driving IC is arranged only on one short side. 7. A first electrode driving IC and a second electrode driving IC
The electrode driving of the matrix type display device, characterized in that terminals facing each other across the short side of C are connected via wiring on a mounting substrate, and the first and second electrode driving ICs are connected in tandem. IC.