JPS61269134A - Liquid crystal projection type display device - Google Patents

Abstract

PURPOSE:To display an image on a rectangular picture plane by changing expanding magnification in the X and Y axis directions and changing the changing magnifications of X and Y axes in accordance with the expanding magnification. CONSTITUTION:A photographing optical part 9 consists of projection lenses 15, 16, the projection lens 15 expands both the X and Y axes uniformly by n times and the projection lens 16 is a semicircular type lens expanding the X axis by (m) times and the Y axis by unmagnification, so that an image obtained through the two projection lenses 15, 16 can be expanded by (m).(n) times in the X axis and (n) times in the Y axis. Speed control circuits 22X, 22Y control the X axis moving speed and Y axis moving speed of an optical axis of a laser beam in accordance with speed command values outputted from circuits 21X, 21Y. The outputs of the circuits 22X, 22Y are inputted to a mirror driving system 31. Magnification correcting circuits 25, 26 formed for the X axis side correct magnification so that the ratio of the X axis to the Y axis is m times on the basis of the expanding magnification of a projection optical part 9 and only the X axis is set up to 1/m (magnification of Y axis projection optical part/magnification of X axis projection optical part) by correcting units 25, 26 on the basis of a speed command and a position command.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a liquid crystal projection display device with a rectangular screen.

[Background of the invention]

A conventional example of a liquid crystal projection type display device is ``Projection type liquid crystal display device'' (Chapter 4, 9.351-361B) in ``Display Advanced Technology Collection (Second Edition)''.

However, the display screen of a liquid crystal projection display device is a square screen, and the projection method is to enlarge and project a figure thermally written on a square liquid crystal element with the same magnification on both the X and Y axes using a magnifying projection lens. take the approach.

However, the display screen of most large display devices, such as industrial process diagram displays and railway vehicle monitoring displays, is often a rectangular display screen with a 1% rectangular length and a long horizontal rectangular display screen. There were also limitations on expansion to a rectangular shape due to the writing system.

[Purpose of the invention]

An object of the present invention is to provide a liquid crystal projection display device that enables display on a rectangular screen.

[Summary of the invention]

In order to project figures onto a rectangular screen, the present invention adjusts the magnification of the X-axis (hereinafter referred to as the horizontal axis) and Y-axis (hereinafter referred to as the vertical axis) of the projection optical section. In other words, the Y-axis is increased, and the thermally written figure is projected onto the liquid crystal element. When thermally writing to the liquid crystal element,
Change the Y-axis of the optical axis control unit that controls the thermally written figure and the rate of change of the Y-axis, that is, change the magnification of the projection optical unit and the rate of change of the optical axis control unit (between Y-axes or between Y-axes). By making the product constant, a figure with the same magnification on both the Y and Y axes is projected onto the rectangular screen.

[Embodiments of the invention]

FIG. 1 shows an embodiment of a liquid crystal projection display device of the present invention.

The write control unit includes a laser 2, an optical axis controller 3 that two-dimensionally scans the optical axis of the emitted laser beam from the laser light source 2, and controls the light intensity and optical axis of the laser beam that is emitted multiple times by the laser 2. It consists of a write control circuit 4 that controls the two-dimensional position of the original axis of the laser beam emitted from the device 3.

j The liquid crystal element 5 is a liquid crystal element that utilizes the thermoelectro-optic effect of smectic physiognomic liquid crystal, and stores figures by means of a laser beam that is two-dimensionally scanned in the X-Y direction by the optical axis controller 3.

The projection optical section 12 includes a light source, a lens 7, and a half mirror.
8, a projection optical section 9, and a screen LO.

The light from the light source 6 is transformed into parallel light by the lens 7.

The half mirror 8 illuminates the liquid crystal element 5 with half the amount of light. The light irradiated onto the liquid crystal element 5 is reflected only in a portion other than the line written by the writing control section, and is again passed through the half mirror 8 and projected onto the screen 10 through the projection optical section 9. Here, the two-dimensional luminous flux reflected by the liquid crystal element 5 is the luminous flux of the figure drawn on the liquid crystal element 5, and the luminous flux of this figure is expanded by the projection optical section 9, forms an image of the screen figure, and V The writing control unit IK optically displays the figure written on the liquid crystal element 5.

The screen controller 11 creates control data for graphic creation to the write control circuit 4 and voltage data for graphic creation to the liquid crystal element 5.

FIGS. 2(a) and 2(b) show an embodiment of the projection optical section 9 of the present invention. Projection optics! 159 is a projection lens 15.
It consists of 16 parts. (a) The figure shows the situation on the Y axis, and (b) the situation on the #:l″X axis.

The projection lens L5 is a lens that uniformly magnifies the Y-axis by n times, and the projection lens 16 is a lens that magnifies the Y-axis by m times.

The Y axis is a 1x Kamabot type lens. As a result, the image obtained through the two projection lenses 15 and 16 can be enlarged by men times in X@ and n times in Y411.

FIG. 3 shows an embodiment of the optical axis control section 3.

The optical axis control section 3 includes a position command circuit 30 and a lens drive system 3.
1 and so on. Position command circuit 30u, X-axis circumferential position control circuit 20X, Y-motion position control circuit 20Y, X-axis circumferential upper limit speed control circuit 21X, Y-axis circumferential upper limit speed control circuit 21Y, X-axis circumferential speed control circuit 22X, Y-axis circumferential upper limit Speed control circuit 22Y
, a speed magnification correction circuit 25, and a position magnification correction circuit 26.

The position control circuits 20X and 20Y output moving operation speed signals in order to control the position of the optical axis of the laser beam in the Y-axis and Y-axis directions in accordance with the 1-position command. In the upper limit speed control circuit 21, 21Y limits the speed signals from the 1-position control circuits 20X and 20Y to below the speed command signal.

The speed control circuits 22X and 22Y are the circuit 21X.

According to the speed command value of 21Y, the X of the original axis of the laser beam
Controls the axis movement speed and Y-axis movement speed. This output becomes an input to the mirror drive system 31.

The magnification correction circuits 25 and 26 provided for the X-axis side are
The magnification of the projection optical section 9 shown in the figure corrects the fact that the Y-axis is m times as large as the Y-axis.

Namely 1. The speed command 1 position command is sent to the correction circuits 25 and 26, and only the Y-axis is set to 17 m (Y-axis projection optical section magnification/X-axis projection optical section magnification) to correct the projected figure.

The lens drive system 31 includes an X-axis peripheral mirror drive section 23X.

It consists of a Y-axis circumferential mirror drive section 23Y, an X-axis mirror 24X, and a Y-axis mirror 24Y.

In the Mitsu drive unit 23, 23Y is a speed control circuit 22X,
Using the output speed of 22Y as input, 24Y is driven to the mirror 24. In this mirror drive section 23, negative feedback is provided from 23Y to one circuit 20X, 20Y and 22X, 22Y as shown in the figure to improve accuracy.

The mirror 24Y is irradiated with an output laser beam from the laser source 2 and is subjected to direction control in the Yil11 direction. Receiving laser beams from mirror 24XFi and mirror 24Y,
X-axis direction control is performed, and from this mirror 24X,
Laser light controlled in both Y-axis directions is output. This output laser light becomes input light to the liquid crystal element 5, serves as a storage position command, and also serves as data to be stored, and is subjected to thermal embedding.

Correction will be explained graphically in FIGS. 4(a), (b), and (C). In FIG. 4, (a) is the original figure to be displayed, (b) is the figure thermally written on the liquid crystal element, and (C) is the figure projected onto the screen. Namely.

The original figure in (a) is enlarged by the correction circuits 25 and 26 so that only the speed and position of the ), so the relationship between (b) and (C) is as follows.

By substituting equation (1) into equation (2), the next image projected onto the screen can be enlarged to n- times the original image without loss of resolution.

That is, the projection optical unit 9 can display the image on a rectangular screen whose X axis (horizontal axis) is m times the Y axis (vertical axis), and the figure can be an enlarged view of the original figure.

Note that it is clear that the X-axis and Y-axis can be either vertical or horizontal.

〔Effect of the invention〕

According to the present invention, there is an effect that it is possible to enlarge a rectangular screen having a dimension difference in the horizontal and vertical axes without impairing the resolution in the longitudinal direction.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the liquid crystal projection display device of the present invention, and FIG.
Figures (a) and (b) are diagrams for explaining the instruction and operation of the projection optical section, and Fig. 3 is a diagram of an embodiment of the optical axis control section. FIGS. 4(a), 4(b), and 4(C) are correction explanatory diagrams. ■...Writing control unit, 2...Laser light source, 3...
Optical axis controller, 4... narrow control circuit, 5... liquid crystal display element.

Claims (1)

[Claims] 1. A laser light source, an optical axis control section that controls changing the optical axis of the laser light from the laser light source, and a liquid crystal element on which thermal writing is performed by irradiation with the laser light from the control section. A liquid crystal projection display device comprising: a projection optical section that reads out a figure written on the liquid crystal element through reflected light from irradiation and obtains an enlarged figure; and a screen that displays the output light of the projection optical section. The projection optical section is configured to have different magnifications in the X-axis and Y-axis directions, and the optical axis control section
A liquid crystal projection display device configured to have different magnifications of change on the axis and Y axis.