JPH09179531A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which is of a low cost and compact by realizing a constitution which reduce the circuit scale and cost in a liquid crystal display device which allows display of plural images on one screen. SOLUTION: This device is provided with an IC group 17 constituting a scan electrode drive circuit which drives the scanning electrode of a liquid crystal display panel 16, an IC 18 of signal electrode driving circuit, a data signal processing circuit 13, 14 which supply data signals to each of these electrode driving circuit ICs. And the IC group 18 is composed from plural ICs each of which is loaded with plural pieces of video image information obtained by dividing one screen of image information. By plural data signal processing circuits 13, 14 which correspond to these plural ICs, plural data signals which correspond to plural pieces of video image information are produced to be supplied to an IC group 18 of signal electrode driving circuit, enabling simultaneous display of plural kinds of video image information on one screen.

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 device useful as a display for video equipment such as a television.

[0002]

2. Description of the Related Art In recent years, with the technological innovation of multimedia,
There is a strong demand for a liquid crystal display device capable of displaying a plurality of images on one screen, and a conventional liquid crystal display device of this type will be described below with reference to the drawings. FIG. 2 is a block diagram showing a schematic configuration of a liquid crystal display device of the type which is used in recent years to simultaneously output two types of video information on one screen.

In FIG. 2, reference numeral 1 is composed of a tuner or the like for generating a composite video image signal,
Video signal circuit for processing video signal from the outside, 2 A / D conversion circuit, 3 memory circuit, 4 D / A conversion circuit, 5 data signal processing circuit for processing video signal, 6 control signal processing A circuit, 7 is a character image circuit including a microcomputer and an external storage device and having a function of freely reading out still image images such as character characters and maps and a control function of image signals, 8 is a liquid crystal display panel, 9
Is a signal electrode drive circuit IC that drives the signal electrodes of the liquid crystal display panel 8, and 10 is a scan electrode drive circuit IC that drives the scan electrodes of the liquid crystal display panel 8. SG _{1 to} SG ₇ represent various signals, SG ₁ is a video signal generated by the video signal circuit 1, SG ₂ is a control signal generated by the character video circuit 7, and SG ₃ is a character generated by the character video circuit 7. A video signal, SG ₄ is a first data control signal for synchronizing the data signal processing circuit 5 and the control signal processing circuit 6, and SG ₅ is a second data control signal for synchronizing the character video circuit 7 and the control signal processing circuit 6. A data control signal, SG ₆ indicates a data signal to be transmitted, and SG ₇ indicates an electrode IC control signal to be transmitted to the scan electrode driving circuit IC10 and the signal electrode driving circuit IC9.

Next, the operation of displaying two different images on the screen of one liquid crystal display panel 8 with such a configuration will be described. The two images displayed here are an image by the video signal SG ₁ generated by the video signal circuit 1 and an image by the character image signal SG ₃ generated by the character image circuit 7. First, the second data control signal SG ₅ generated by the control signal processing circuit 6 is a signal synchronized with the video signal SG ₁ generated by the video signal circuit 1 and is the first data control signal generated by the data signal processing circuit 5. Made from SG ₄ . Using the second data control signal SG ₅ as a reference, the video control signal SG ₂ is created by the character video circuit 7, and by this signal, A
The video signal SG ₁ generated from the video signal circuit 1 by controlling the / D conversion circuit 2, the memory circuit 3, and the D / A conversion circuit 4
Is converted into a digital signal by the A / D conversion circuit 2, and the memory circuit 3
To memorize. Next, the character video circuit 7 controlled by the second data control signal SG ₅ creates a character video to be displayed on the liquid crystal display panel 8 and sends it to the memory circuit 3 as a character video signal SG ₃ . The sent signal is subjected to video synthesis in the memory circuit 3 based on the video control signal SG _2, and _two video signals of the video signal SG ₁ and the character video signal SG ₃ are generated by an arbitrary image synthesis method. Signals that are displayed simultaneously on one screen are created as digital signals. The combined signal is converted into an analog signal by the D / A conversion circuit 4 and sent to the data signal processing circuit 5.

[0005] Such signal sent to the data signal processing circuit 5 to the, by the data signal processing circuit 5 to signal processing for use in the signal electrode driving circuit IC 9, as a data signal SG _6, the signal electrode Drive circuit I
Sent to C9. At the same time, the data signal processing circuit 5
The electrode I for controlling the scan electrode and the signal electrode by the control signal processing circuit 6 on the basis of the first data control signal SG ₄ generated in
C control signal SG _{7 is} also produced, and signal electrode drive circuit I
It is sent to C9 and the scan electrode drive circuit IC10.

The data signal S sent in this way
The two signals G ₆ electrode IC control signal SG _7, the signal electrode driving circuit IC9 and the scanning electrode driving circuit IC10 is operated, one screen video signal is synthesized on the memory circuit 3 to the SG of the liquid crystal display panel 8 ₁ and character video signal SG ₃
The images based on the two image signals are simultaneously displayed.

[0007]

However, in such a conventional configuration, the A / D conversion circuit, the memory circuit, the D
A / A conversion circuit is required, the circuit configuration is complicated, the scale is increased, and the liquid crystal display device itself is also increased.
In addition, the cost of direct materials also increases.

In view of the above points, the present invention realizes a configuration that suppresses the circuit scale and circuit cost, which are the above problems,
An object is to provide a low-priced and compact liquid crystal display device.

[0009]

A liquid crystal panel having scan electrodes and signal electrodes formed in a matrix, a scan electrode drive circuit IC for driving the scan electrodes, and a signal electrode drive circuit IC for driving the signal electrodes. In a liquid crystal display device having a signal processing circuit for supplying a data signal to each of the electrode driving circuit ICs, a plurality of the signal electrode driving circuit ICs are arranged and one screen of video information is converted into a plurality of video information. A plurality of data signal processing circuits corresponding to the plurality of signal electrode drive circuit ICs are used to create a plurality of data signals corresponding to the plurality of video information, and the plurality of signal electrode drive circuit ICs are divided into the plurality of signal electrode drive circuit ICs. It is supplied so that plural kinds of video information can be simultaneously displayed on one screen.

According to the present invention, A which has been conventionally required
A / D conversion circuit, a memory circuit, a D / A conversion circuit, etc. are not required, and two or more types of video information can be simultaneously output on one screen, the circuit configuration can be simplified, and the circuit scale can be increased. It is possible to provide a small, low-cost, and compact liquid crystal display device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a liquid crystal display device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing its schematic configuration. In the figure, 11 is a character image circuit which is composed of a microcomputer and an external storage device and has a function of freely reading out still image images such as character characters and maps, and 12 is a character image circuit. A video signal circuit including a tuner or the like for generating a composite video image signal and processing an external video signal, and 13 is a first part for processing a divided partial video signal displayed on a liquid crystal display panel described later. A data signal processing circuit, 14 is a second data signal processing circuit for processing video signals of the other divided parts displayed on the liquid crystal display panel, 15 is a control signal processing circuit, 16 is a liquid crystal display panel, 17 is a liquid crystal A scanning electrode driving circuit IC for driving the scanning electrodes of the display panel 16 is a signal electrode driving circuit for driving the signal electrodes arranged in a matrix with the scanning electrodes. In IC group, the plurality of signal electrode driving circuit I
The adjacent ICs, which are composed of C18a and C18b, divide the video signals displayed on the liquid crystal display panel 16 and bear them, and are arranged so as to form one screen as a whole. SG _{8 to} SG ₁₆ indicate various signals, and SG ₈
Is a character video signal generated from the character video circuit 11, SG ₉ is a first data signal transmitted to the signal electrode drive circuit IC 18a, SG ₁₀ is a video signal generated from the video signal circuit 12, and SG ₁₁ is a signal electrode drive circuit IC 18b. The second data signal SG ₁₂ to be transmitted is a first data control signal SG ₁₃ for synchronizing the operation of the data signal processing circuit 14 and the operation of the control signal processing circuit 15 which operate on the basis of the video signal SG _10. The first electrode IC control signal for controlling the signal electrode drive circuit IC 18a, SG ₁₄ is the signal electrode drive circuit IC
The second electrode IC control signal for controlling the 18b, SG ₁₅ and the third electrode IC control signal for controlling the scanning electrode drive circuit IC 17, S
G ₁₆ is a second data control signal SG ₁₂ based on the video signal SG ₁₀ and a second data control signal SG ₁₂ for synchronizing the character video circuit 11 with the video signal SG ₁₀ .
This is a data control signal. The two images displayed here are the video signals SG generated by the video signal circuit 12.
_The image by ₁₀ and the image by the character image signal SG ₈ generated from the character image circuit 11.

The operation of the liquid crystal display device configured as described above will be described. In FIG. 1, the video signal circuit 12
The generated video signal SG ₁₀ is sent to the second data signal processing circuit 14 and subjected to signal processing so that it can be used by the signal electrode drive circuit IC 18b, and as a second data signal SG ₁₁ ,
It is transmitted to the signal electrode drive circuit IC18b. At this time, the second
The first data control signal SG ₁₂ which is a control signal synchronized with the video signal SG ₁₀ sent to the second data signal processing circuit 14 for synchronizing the data signal processing circuit 14 and the control signal processing circuit 15 It is created in the data signal processing circuit 14, and this first data control signal SG ₁₂ is sent to the control signal processing circuit 15. Based on the first data control signal SG ₁₂ , the first electrode IC control signal SG ₁₃ for controlling the signal electrode drive circuit IC _{18 a} and the signal electrode drive circuit IC in the control signal processing circuit 15
The second electrode IC control signal SG ₁₄ for controlling 18b and the third electrode IC control signal SG ₁₅ for controlling the scan electrode driving circuit IC17
And create these signals and send these signals to the signal electrode drive circuit IC group 18
a, signal electrode drive circuit IC 18b, scan electrode drive circuit IC
Transmit to 17 respectively.

In the control signal processing circuit 15, a second data control signal SG ₁₆ which is a control signal synchronized with the video signal SG ₁₀ is also created based on the first data control signal SG ₁₂ , and this signal is used as a character. Send to the video circuit 11. In this character video circuit 11, a character video signal SG ₈ that is synchronized with the video signal SG ₁₀ is created, and the created character video signal SG ₈ is sent to the first data signal processing circuit 13, Electrode drive circuit IC18
the processing of signals for use with a, as a first data signal SG _9, is transmitted to the signal electrode driving circuit IC 18a.

That is, the first data signal SG ₉ which is the character video signal SG ₈ processed by the first data signal processing circuit 13 and the first electrode IC control signal SG ₁₃ are transmitted to the signal electrode drive circuit IC 18a. , the signal electrode driving an image of the character image signal SG ₈ in this first electrode IC control signal SG ₁₃ signal electrode driving circuit which is controlled by IC18a and the third electrode IC control signal scanning electrode driving circuit IC17 which is controlled by the SG ₁₅ Liquid crystal display panel borne by the circuit IC 18a
A second electrode IC control signal SG ₁₄ and a second data signal SG ₁₁ which is a video signal SG ₁₀ displayed on the display screen portion 16 and processed by the second data signal processing circuit 14 are supplied to the signal electrode drive circuit. This second electrode IC is transmitted to IC18b
Controlled by the control signal SG ₁₄ signal electrode driving circuit IC18b
The image of the video signal SG ₁₀ is the signal electrode driving circuit IC group 18b on the display screen of the liquid crystal display panel 16 which is borne by the the third electrode IC control signal SG ₁₅ is controlled by the scan electrode driving circuit IC17 As a result, the video of the character video signal SG _{8 and} the video of the video signal SG ₁₀ can be simultaneously displayed on one screen.

Further, only one of the output signal of the first data signal processing circuit 13 for processing the signal of the character video signal SG ₈ or the output signal of the second data signal processing circuit 14 for processing the signal of the video signal SG ₁₀ is provided. If the signal of is transmitted to both the first data signal SG ₉ and the second data signal SG ₁₁ , either one of the video of the character video signal SG ₈ or the video of the video signal SG ₁₀ is displayed on one screen as a whole. Further, by switching the signals of the first data signal SG ₉ and the second data signal SG ₁₁ , the display locations of the video of the character video signal SG _{8 and} the video of the video signal SG ₁₀ can be changed. It can be replaced.

Further, when the image of the character image signal SG _{8 and} the image of the video signal SG ₁₀ are simultaneously displayed on one screen, the first electrode IC control signal SG ₁₃ and the signal for controlling the signal electrode drive circuit IC 18a are provided. Electrode drive circuit IC18
Since the second electrode IC control signal SG ₁₄ controlling b is transmitted independently, the signal electrode drive circuit IC18a and the signal electrode drive circuit IC18b can also be controlled independently.
For example, the first electrode IC control signal SG ₁₃ for controlling the signal electrode driving circuit IC18a the character image signal SG ₈ is being displayed, by changing the starting position for sampling an image of this control signal, the character image signal SG ₈ It is possible to change the display start position of the image of the character image signal SG ₈ or change the image sampling frequency by controlling the liquid crystal display panel of the liquid crystal display panel composed of the signal electrode drive circuit IC group 18a. The video area of the character video signal SG ₈ displayed in the display area can be freely controlled. Here, the character video signal SG ₈ has been described as an example, but the same modification can be applied to the video signal SG ₁₀ .

Note that the configurations shown in the embodiments of the present invention are merely examples, and there may be a plurality of signal electrode drive circuit IC groups, and the number of signal electrode drive circuit ICs constituting this may be one. good. As the liquid crystal display panel, an active matrix type liquid crystal display panel or a simple matrix type liquid crystal display panel can be used.

As described above, in this embodiment, two or more video signals can be simultaneously displayed on one screen with a simple circuit configuration.

[0019]

As described above, the present invention can simultaneously display two or more video signals on one screen with the above-mentioned simple structure, and the peripheral circuit scale is small, compact and low in cost. The advantageous effect that it can be easily achieved is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a conventional liquid crystal display device.

[Explanation of symbols]

11 ... Character video circuit, 12 ... Video signal circuit,
13 ... First data signal processing circuit, 14 ... Second data signal processing circuit, 15 ... Control signal processing circuit, 16 ... Liquid crystal panel,
17 ... scan electrode driving circuit IC, 18 ... signal electrode driving circuit IC group, SG ₈ ... character video signal, SG ₉ ... first data signal, SG ₁₀ ... video signal, SG ₁₁ ... second data signal, SG ₁₂ ... first 1 data control signal, SG ₁₃ ...
1st electrode IC control signal, SG ₁₄ ... 2nd electrode IC control signal, SG ₁₅ ... 3rd electrode IC control signal, SG ₁₆ ... 2nd
Data control signal.

Claims (2)

[Claims] 1. A liquid crystal panel having scan electrodes and signal electrodes formed in a matrix, a scan electrode drive circuit IC for driving the scan electrodes, a signal electrode drive circuit IC for driving the signal electrodes, and each of these electrodes. In a liquid crystal display device including a signal processing circuit for supplying a data signal to a drive circuit IC, a plurality of the signal electrode drive circuit ICs are arranged, and the video information of one screen is divided into a plurality of video information for each of them. Then, a plurality of data signal processing circuits corresponding to the plurality of signal electrode drive circuits IC generate a plurality of data signals corresponding to the plurality of video information and supply the data signals to the plurality of signal electrode drive circuit ICs. A liquid crystal display device characterized by simultaneously displaying multiple types of video information on one screen. 2. A liquid crystal panel having scan electrodes and signal electrodes formed in a matrix, a scan electrode drive circuit IC for driving the scan electrodes, a signal electrode drive circuit IC for driving the signal electrodes, and each of these electrodes. In a liquid crystal display device including a signal processing circuit for supplying a data signal and a control signal to a drive circuit IC, a plurality of the signal electrode drive circuit ICs are arranged and one screen of image information is divided into a plurality of image information. The plurality of data signals and control signals corresponding to the plurality of video information are generated by the signal processing circuit that supplies the data signals and control signals corresponding to the plurality of signal electrode driving circuits ICs. And a plurality of kinds of video information are displayed on one screen and the video area is controlled. Display device.