JPH0962230A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform multiple image plane display only by control of a timing signal by dividing source drivers, and providing a mode to operate them in parallel to each other. SOLUTION: A first source driver 2 and a second source driver 3 correspond to image planes divided into two parts. Switches SW1 to SW3 are arranged between the first source driver 2 and the second source driver 3, and respectively switch an RBG signal, a clock and a start pulse, and switch so as to connect the first source driver 2 and the second sorce driver 3 in series or in parallel to each other. For example, in the case of a parallel connection condition, image information 1 (RGB1) is inputted to the first source driver 2 as a different picture signal, and a picture signal 2 (RGB2) generated by a picture signal generator 7 is inputted to the second source driver 3, and a clock signal and a start pulse are sent from a controller 5.

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 used for displaying a television image and other images simultaneously on a multi-screen on a television receiver using liquid crystal.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display device using a liquid crystal has been widely used for in-vehicle use as a television receiver of low power consumption and small size. The role of a television receiver as a general-purpose display device that not only receives a television image but also displays information of a navigation system and other information has been reviewed. On the other hand, the television signal has an aspect ratio of 4: 3 to 16: in order to enlarge a clear-vision or cine-size image.
It is shifting to the 9-wide screen. A wide aspect panel is also demanded for in-vehicle liquid crystal televisions, and further, there is an increasing demand for simultaneously displaying a television image and a navigation image on one screen by using a wide screen.

An example of a conventional liquid crystal display device will be described below.
FIG. 2 shows a conventional liquid crystal display device.

In FIG. 2, the liquid crystal panel 1 is a liquid crystal panel having an aspect ratio of 16: 9. For example, a conventional example in which the display unit of the liquid crystal panel is horizontally divided into two and two screens are displayed will be shown.

In FIG. 2, reference numeral 1 is a screen on the left side of the liquid crystal panel, and 2 is a screen on the right side. The TV signal is displayed on the screen 1 and the map information from the navigation system is displayed on the screen 2. The liquid crystal drive circuit is composed of a first source driver 2, a second source driver 3 and a gate driver 4. Each source driver is composed of a shift register and a sample and hold circuit, samples and holds the given RGB analog signals at the timing of a given clock, and gives them to the liquid crystal panel. First source driver 2 and second source driver 3
Since the internal shift registers are connected in series,
It works as if it were a shift register. On the other hand, the gate driver 4 opens the gate once in a horizontal cycle in synchronization with the timing of the horizontal clock, sends the signal held by the source driver to the liquid crystal cell, and actually drives the liquid crystal. In order to display two screens at the same time, the RGB television signal generated by the television signal processing circuit 6 is written once in the line memory 8 and the signal RGB1 read out in 1/2 horizontal period with double the read clock.
And the signal RG of 1/2 horizontal period generated by the video signal generator 7
The synthesizing circuit 9 synthesizes B2 in the first half and the latter half of one horizontal period, and supplies it to the first source driver 2 and the second source driver 3. Video signal generator 7
Produces a video signal synchronized with the horizontal pulse H and the vertical pulse V of a television signal, and is specifically a character signal generator having a map image for navigation and a character generator. The controller 5 generates a clock and a start pulse to be given to the liquid crystal panel, and also generates a clock and a control signal for synthesizing two screens.

Of course, when the line memory and the synthesizing circuit are made inoperative and the signal of the television signal processing circuit is directly applied to the source driver to display not only two screens but only the television signal on the full screen or the navigation map information is displayed. It can also be displayed on the screen.

[0007]

However, in the above-mentioned conventional configuration, in order to display not only two screens but also multiple screens, an expensive video line memory and a synthesizing circuit are required. Therefore, the circuit becomes complicated in the case of multi-screen display, and there is a problem in cost.

That is, when a general source driver is connected in series and displays one screen on all screens,
Although convenient, when displaying two screens as described above, a circuit configuration such as time compression using a memory and synthesizing signals of two screens is required.

In order to solve the above-mentioned problems, the present invention provides a liquid crystal display device which is inexpensive and has a simple structure by changing a panel drive circuit.

[0010]

In order to solve this problem, according to the present invention, in a liquid crystal display device having a plurality of source drivers, a plurality of source drivers are connected in series, and the same image is provided to each source driver. Information and a first mode for supplying the same clock for driving the shift register of the source driver, and a plurality of source drivers are divided into a plurality of groups, and different groups are driven with different image information and source driver shift registers. A liquid crystal panel drive device having a second mode for applying a clock to perform parallel operation and having a switch means for switching between the first mode and the second mode is used, and in the first mode in which source drivers are connected in series, the entire screen is displayed. Display one screen, divide the source drivers into groups, and display different images for each. No. and in the second mode operated in parallel to give a clock, and has a configuration capable of displaying more than 2 screen multi-screen simultaneously.

[0011]

With this configuration, by dividing the source drivers into a plurality of groups and inputting different video signals to each group, a dual-screen TV can be used with only a simple timing signal without using an expensive video signal memory. Can be configured. Further, by connecting the source driver in series with the mode switch, the same usage as the conventional liquid crystal panel is possible.

[0012]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The same numbers are given to the same circuit blocks as in the conventional example of FIG. The liquid crystal panel 1 is a 16: 9 wide liquid crystal panel and divides the screen into two in the horizontal direction to display two screens. The left screen 1 displays a television signal, and the screen 2 displays a navigation map screen made by the video signal generator 7. First source driver 2 and second
The source driver 3 of corresponds to a screen divided into two. Switches SW1, SW2, and SW3 are provided between the first source driver 2 and the second source driver 3 to switch the RGB signal, clock, and start pulse, respectively, and the first source driver 2 and the second source driver 3 are switched. Are connected in series or in parallel. The state of the switches in FIG. 1 shows the state of parallel connection. In this case, as different video signals, the video information 1 (RGB1) generated by the television signal processing circuit is input to the first source driver 2, and the second source driver 3 is generated by the video signal generator 7. Video signal 2
(RGB2) is input. The controller 5 sends necessary clock signals and start pulses to the respective source drivers. Further, the controller 5 controls the video signal generator 7 based on the horizontal synchronizing signal H and the vertical synchronizing signal V of the television signal.

Although there are two screens in this embodiment, many multi-screen display methods are possible by combining a plurality of source drivers into a group of screen areas.

[0015]

As described above, by dividing the source driver and having a mode for operating in parallel, it is not necessary to have an expensive video memory when displaying two screens, and simply by controlling the timing signal. The present invention realizes a liquid crystal display device capable of multi-screen display.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a liquid crystal display device in a conventional example.

[Explanation of symbols]

 1 Liquid Crystal Panel 2 First Source Driver 3 Second Source Driver 4 Gate Driver 5 Controller 6 Television Signal Processing Circuit 7 Video Signal Generator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Ohira, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A liquid crystal panel comprising a liquid crystal panel, a plurality of source drivers, a controller for supplying a clock for driving a shift register of the source drivers, and a switch means for switching a connection method between the plurality of source drivers. Display device.