JPH03150592A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To move and display a cursor pointer on a liquid crystal display screen by displaying the cursor pointer at a position specified on the liquid crystal display screen with an operation body. CONSTITUTION:When the position of the cursor pointer is specified with the operation body such as a remote control part 9, an external switch, or a mouse 10, a pointer position control circuit 8 counts a horizontal and a vertical liquid crystal display timing signal outputted by a liquid crystal display driving means 3 to decide the position of the cursor pointer on the screen, and outputs a pointer position signal. Then a position display data generating circuit 7 outputs pointer display data at the timing of the pointer position signal and a data superposing circuit 6 displays the cursor pointer on the screen of a liquid crystal display unit 5. Consequently, the cursor pointer can be displayed on the liquid crystal screen at an optional position completely irrelevantly to a video signal from a personal computer, etc.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a liquid crystal display device such as a liquid crystal projection panel for over-head projection or a liquid crystal projector that projects and displays a screen based on a video signal from a personal computer. It is.

<Prior Art> For example, in order to drive a CRT display device from a personal computer, a horizontal synchronization signal, a vertical synchronization signal, and a video signal are output. On the other hand, conventional liquid crystal display devices are driven by a completely different driving principle from that of CRT display devices, such as by applying an alternating current voltage between the transparent electrode and the back electrode of each pixel.

Therefore, a liquid crystal display device as shown in FIG. 2 has been proposed which can be connected to a personal computer in a replaceable manner with a CRT display device, and this liquid crystal display device is constructed as follows.

The horizontal/vertical timing and clock generation circuit 1 receives a horizontal synchronization signal H5y for driving a CRT display device, which is input from a personal computer or the like. , vertical synchronization signal V 5y
nc and color video signals R, G, B, a horizontal timing signal Hblank and a vertical timing signal V for controlling the operation of the frame memory writing circuit 2.
A blank signal and a clock signal C1ock are generated, and the color video signals R, G, and B are combined into one serial signal and data whose relationship with the frequency of the clock signal C1ock is adjusted is output.

Then, the write data corresponding to one screen input to the frame memory write circuit 2 is synchronized with the write signal at a predetermined timing to the address of the frame memory of the frame memory circuit 4 corresponding to that screen by the frame memory write circuit 2. They are written sequentially and stored once.

When the writing of data to the frame memory is completed, the read/write switching signal of the frame memory write circuit 2 switches to a data read mode in which data in the frame memory can be read, and the frame memory read and data read signals of the liquid crystal display circuit 3 are activated. The data stored in the frame memory is sequentially read out in synchronization with The liquid crystal display data is output to the liquid crystal display unit 1-5 as serial data for liquid crystal display together with the liquid crystal display synchronization signal, data shift chronograph signal, and alternating current signal. The image corresponding to the screen is displayed on the LCD.

Write and read access to the frame memory is performed in a time-division manner, read access is performed between write accesses, the read data is latched, and the data is processed to match the format of the LCD display and displayed on the LCD. do.

<Problems to be Solved by the Invention> By the way, is the liquid crystal display device used as an over-projection liquid crystal projection panel for projecting and displaying a liquid crystal screen? (9. When using a crystal projector to point out a desired part of the display screen during explanations or presentations, it is difficult for the viewer to You cannot always keep your eyes on the entire display screen because your view is obstructed.

One possible solution to this problem is to use software to superimpose a cursor pointer, which can be moved arbitrarily within the screen using a mouse or keyboard, on the video signal.

However, creating software for superimposing a cursor pointer on a video signal requires an extremely large amount of effort, and there is a problem in that the same amount of effort is required each time the personal computer that is the output source of the video signal is replaced.

The present invention has been made in view of these conventional problems, and provides a liquid crystal display in which a cursor pointer can be moved and displayed at any position on a liquid crystal display screen, completely independent of video signals from a personal computer or the like. The technical problem is to provide a device.

Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a liquid crystal display means is configured as follows. That is, a video signal from a personal computer or the like is processed by a liquid crystal display driving means into liquid crystal display data that matches the format for liquid crystal display, and is displayed on a liquid crystal display unit. a pointer position control circuit that determines based on a liquid crystal display timing signal from the liquid crystal display driving means; a pointer display data creation circuit that creates pointer display data from the pointer position signal from the pointer position control circuit and the liquid crystal display timing signal; , a data superimposition circuit that superimposes the pointer display data on the liquid crystal display data from the liquid crystal display driving means and outputs the same to the liquid crystal display unit, the cursor is placed at a position specified by the operating body on the liquid crystal display screen. It is configured to display a pointer.

<Function> When the position of the cursor pointer is specified using any operating body such as a remote control unit, an external switch, or a mouse, the pointer position control circuit generates horizontal and vertical liquid crystal display timing signals output from the liquid crystal display driving means. is counted to determine the position on the screen of the cursor pointer designated by the operating body, and outputs a pointer position signal.

Subsequently, the pointer display data generation circuit compares the liquid crystal display timing signal with the pointer position signal and outputs pointer display data at the timing of the pointer position signal.

Furthermore, in the data superimposition circuit, new liquid crystal display data is created by superimposing the pointer display data from the pointer display data creation circuit on the liquid crystal display data as normal video data output from the liquid crystal display driving means, and The output is output to the liquid crystal display unit, and a cursor pointer is displayed on both sides of the liquid crystal display unit.

This cursor pointer is displayed by superimposing pointer display data created completely independent of the video signal from a personal computer etc. onto the LCD display data, so it is compared to creating a cursor pointer in the video signal by software. It takes only a little effort.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing an embodiment of the present invention, the same parts as in FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted.

That is, horizontal/vertical timing and clock generation circuit 1;
The structure of the frame memory writing circuit 2, frame memory reading and liquid crystal display circuit 3, frame memory circuit 4, and liquid crystal display unit 5 allows the operation of performing liquid crystal display by inputting only signals for driving the CRT display device from a personal computer, etc. is the same as in the case of FIG. 2, and will therefore be omitted.

The present invention has the configuration shown in FIG. 2 in which a data superimposition circuit 6, a pointer display data creation circuit 7, a pointer position control circuit 8, a remote control unit 9, and an external operating body 10 such as an external switch or a mouse are added. It is.

Next, the operation of the above embodiment will be explained. When the remote control section 9 or the external operating body 10 is operated, a pointer position designation signal is input from either of them to the pointer position control circuit 8, and the pointer position control circuit 8 reads the frame memory and outputs the horizontal signal from the liquid crystal display circuit 3. and a vertical liquid crystal display timing signal to determine the position of the cursor pointer on the screen specified by the pointer position designation signal, and output a pointer position signal.

Subsequently, the pointer display data creation circuit 7 compares the liquid crystal display timing signal with the pointer position signal and outputs pointer display data at the timing of the pointer position signal.

Furthermore, the data superimposition circuit 6 superimposes the pointer display data from the pointer display data creation circuit 7 on the frame memory readout and liquid crystal display data (=9) as normal video data output from the liquid crystal display circuit 3 to generate new data. Creates liquid crystal display data and outputs it to the liquid crystal display unit 5.
Display the cursor pointer on the screen.

This cursor pointer is displayed by superimposing pointer display data created completely unrelated to the video signal from a personal computer etc. on the LCD display data, so it is difficult to create a cursor pointer within the video signal using software. It requires relatively little effort.

<Effects of the Invention> As described above, according to the liquid crystal display device of the present invention, by a simple means of simply superimposing pointer display data created completely independently of a video signal from a personal computer or the like on liquid crystal display data, The cursor pointer can be displayed at any position on the LCD screen, requiring less effort than creating a cursor pointer using software, and can be used as is even if the video signal output source, such as a Vertuna computer, is used. Can be used. In particular, the present invention can be applied to a liquid crystal projection panel for over-height projection or a liquid crystal projector to obtain extremely remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional device. Frame memory readout and liquid crystal display circuit (liquid crystal display driving means) Liquid crystal display unit data superimposition circuit...Pointer display data creation circuit Pointer position control circuit Remote control unit (operating body) External operating body (operating body) Patent applicant Sharp Corporation Representative Patent Attorney Nishi 1) New 11

Claims (1)

[Claims] (1) In a liquid crystal display device in which a video signal from a personal computer, etc. is signal-processed by a liquid crystal display driving means into liquid crystal display data that matches the format for liquid crystal display, and the data is displayed on a liquid crystal display unit, a pointer position specified by an operating body is displayed. a pointer position control circuit that determines the timing using a liquid crystal display timing signal from the liquid crystal display driving means; and a pointer display data creation circuit that creates pointer display data from the pointer position signal from the pointer position control circuit and the liquid crystal display timing signal. and a data superimposition circuit that superimposes the pointer display data on the liquid crystal display data from the liquid crystal display driving means and outputs the same to the liquid crystal display unit, the data superimposing circuit superimposing the pointer display data on the liquid crystal display data from the liquid crystal display driving means and outputting the same to the liquid crystal display unit, the data superimposing circuit superimposing the pointer display data on the liquid crystal display data from the liquid crystal display driving means and outputting the data to the liquid crystal display unit. A liquid crystal display device characterized by displaying a cursor pointer.