JPH04180493A - Stereoscopic television receiver - Google Patents

Abstract

PURPOSE:To reduce a flicker by outputting a RBG output and the signal of average luminance by a field discriminating signal alternately, displaying on a panel for one eye every field and displaying the average luminance signal of the previous field between the fields. CONSTITUTION:An LCD control circuit 11 emits a liquid crystal driving signal (f) and a RGB output signal (h) by the signal from a video/synchronous circuit 1. The signal (h) is inputted to an analog switch 15, an average luminance signal (i) is inputted through an average luminance detecting part 14 and the signals (h) and (i) are switched alternately by a discriminating signal (j) of a field discriminating circuit 3 and are outputted to liquid crystal panels 12 and 13. Since a field between videos displayed alternately on the panels 12 and 13 is displayed by the average luminance signal of the previous field, a flicker is reduced broadly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a three-dimensional television device that uses increasingly diverse liquid crystal display elements.

2. Description of the Related Art In recent years, liquid crystal display devices have been miniaturized by high-density packaging of circuits and have been applied to stereoscopic television devices. The conventional stereoscopic television apparatus described above will be described below with reference to the drawings.

FIG. 2 is a block diagram of a conventional stereoscopic telephony device. In FIG. 2, a video/synchronization circuit l to which a stereoscopic video signal a is input is connected to an RGB output circuit 2 and a field discrimination circuit 3, outputs an RGB signal to the RGB output circuit 2, and also outputs an RGB signal to the RGB output circuit 2. A horizontal/vertical synchronizing signal (hereinafter referred to as H/V synchronizing signal) C is output to the discrimination circuit 3. RG
The B output circuit 2 is connected to a CRT 4, and displays a stereoscopic image on the CRT 4. Further, the field discrimination circuit 3 is connected to the liquid crystal shutter glasses 5, and is configured to output a liquid crystal shutter control signal d to the liquid crystal shutter glasses 5 to perform shutter control.

The operation of the above configuration will be explained below. First, the first
The video signal a for stereoscopic □, which has signals for the right eye and left eye in the second field, respectively, is input to the video/synchronization circuit 1, and the video/synchronization circuit 1 separates the luminance signal and the color signal.
Performs synchronization signal separation and RGB matrix. The video/synchronization circuit 1 outputs the H/■ synchronization signal C to the field discrimination circuit 3, and the field discrimination circuit 3 discriminates each field. A liquid crystal shutter control signal d is outputted from the field discrimination circuit 3 to the liquid crystal shutter glasses 5, and the liquid crystal for the right eye and the liquid crystal for the left eye of the liquid crystal shutter glasses 5 are turned on and off alternately for each field. On the other hand, the video/synchronization circuit l is RGB8
An RGB signal is output to the 15 output circuit 2, and a CRT 4 projects images for the right eye and the left eye for stereoscopic viewing in each field. In this way, in the CRT 4, the stereoscopic video signal a is projected for each field as an image for the right eye and for the left eye. You can view the images.

However, in the conventional configuration described above, during viewing, the liquid crystal shutter of the liquid crystal shutter glasses 5 is turned on and off alternately, so the image and the black display when the liquid crystal shutter is turned off are alternately displayed. As a result, there was a problem of noticeable flicker.

The present invention solves the above-mentioned conventional problems, and aims to provide a stereoscopic television apparatus that can prevent flickers from becoming noticeable during viewing.

Means for Solving the Problems In order to solve the above problems, the stereoscopic television apparatus of the present invention includes a liquid crystal display means for displaying images on right-eye and left-eye liquid crystal panels, and a liquid crystal display means for inputting a video signal and controlling brightness. A video/synchronization means that performs signal and color signal separation, synchronization signal separation, and RGB matrix, and R from the video/synchronization means.
a liquid crystal control means for generating an RGB output signal which is a one horizontal period inversion signal or a one vertical period inversion signal of the GB signal; an average brightness detection means for detecting average brightness from the RGB output signal from the liquid crystal control means; Field discrimination means for discriminating fields based on a synchronization signal from the synchronization means; and switching between the RGB output signal and the average luminance signal based on the field discrimination signal from the field discrimination means, and outputting the RGB to each liquid crystal panel of the liquid crystal display means. It is equipped with an analog switch that alternately outputs the signal and the average luminance signal.

Effect With the above configuration, the analog switch switches between the RGB output signal from the liquid crystal display means and the average brightness signal from the average brightness detection means according to the field discrimination signal from the field discrimination means, and the RGB output signal and the average brightness signal are sent to each liquid crystal panel. The right-eye and left-eye liquid crystal panels output one video signal with a right-eye signal in the first field and a left-eye signal in the second field.
One field is displayed alternately in each frame, and the average luminance signal of the previous field is displayed in the fields between the images displayed on each LCD panel, which greatly reduces flicker. will be done.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a three-dimensional television system showing an embodiment of the present invention, and parts having the same functions and effects as those of the conventional example are given the same reference numerals, and the explanation thereof will be omitted. 1st
In the figure, a video/synchronization circuit 1 is connected to an LCD control circuit 11 and a field discrimination circuit 3.
Horizontal synchronization signal and vertical synchronization signal synchronously separated, R
It outputs each signal e of the GB matrixed RGB signals, and also outputs H, which is a horizontal and vertical synchronizing signal, to the field discrimination circuit 3.
-V output signal C is output. Furthermore, LCD control circuit 1
1 is a right eye liquid crystal panel 12 and a left eye liquid crystal panel 13
and outputs each liquid crystal drive control signal f, which is a reference clock, horizontal/vertical sampling start pulse, gate pulse, and common inversion signal generated by the LCDMa circuit 11, to the right-eye liquid crystal panel 12 and the left-eye liquid crystal panel 13, respectively. to drive and control each liquid crystal panel 12, 13. Further, the LCD control circuit 11 is connected to the average brightness detection section 14 and one of the inputs of the analog switch 15, and applies RGB output signals to the average brightness detection section 14 and the analog switch 15. The average brightness detector 14 is connected to the other input of the analog switch 5, and the average brightness detector 14 detects the average brightness based on the RGB output signals and outputs the average brightness signal i to the analog switch 15. The field discrimination circuit 3 is connected to an analog switch 15, and this analog switch 15 is further connected to the right eye liquid crystal panel 12 and the left eye liquid crystal panel 13, and the field discrimination signal from the field discrimination circuit 3 causes the LCD control circuit 11 to RGB output signals from the average brightness detection unit 1
4, the average luminance signal l from each liquid crystal panel 12 is switched.
．． 13, the RGB output signal and the average luminance signal are alternately applied.

The operation of the above configuration will be explained below. First, each signal e of the horizontal synchronization signal and vertical synchronization signal which are synchronously separated and the RGB signal of RGB matrix is inputted from the video/synchronization circuit 1 to the LCD control circuit 11, and from the horizontal synchronization signal and the vertical synchronization signal, the LCD control circuit 11 generates each liquid crystal drive control signal f such as a reference clock, horizontal/vertical sampling start pulse, gate pulse, and common inversion signal for driving and controlling the right-eye liquid crystal panel 12 and the left-eye liquid crystal panel 13; 1 horizontal period (IH) inverted signal or 1 vertical period (1v) inverted signal 0 from signal
Generates an RGB power signal. First, each liquid crystal drive control signal f is input to the right eye liquid crystal panel 12 and the left eye liquid crystal panel 13 to drive and control them. Also, R
The GB output signal is input to the analog switch 15 and also input to the average brightness detection section 14 to detect the average brightness and input the average brightness signal to the analog switch 15. The analog switch 15 switches between the RGB output signal and the average luminance signal l according to the field discrimination signal from the field discrimination circuit 3, and each liquid crystal panel 12.13i:R
The GB output signal 1 and the average luminance signal 1 are output alternately. Therefore, each liquid crystal panel 12.13 displays one field for each frame of a video signal having signals for the right eye and left eye in the first field and the second field. Virtual images of images alternately displayed on each liquid crystal panel 12, 13 are constructed by convex lenses (not shown) provided in front, respectively.

The viewer can enjoy the stereoscopic image by looking at the right-eye liquid crystal panel 12 with the right eye and the left-eye liquid crystal panel j3 with the left eye and viewing the images that are alternately projected and compared.

At this time, since the analog switch 15 is switched by the field discrimination signal, the video signal is alternately displayed for one field every l frame on each LCD panel 12.13, or the dark field of the video is displayed in the front. Since the average luminance signal of the field is displayed, flicker is significantly reduced.

In addition, in the case of pixel arrangement or delta arrangement of each of the two liquid crystal panels 12 and 13, the timing of the reference clock and horizontal/vertical sampling start pulses from the LCD control circuit 11 is changed by half every horizontal period (IH). Phase delay circuit 16 that delays pixels, LCD control circuit 11 and each liquid crystal panel 1
In some cases, it is interposed between 2.13 and 2.13.

Effects of the Invention As described above, according to the present invention, each liquid crystal panel
The image is displayed frame by frame, or the fields between the images are displayed with the average brightness of the previous field.
It is possible to prevent flicker from becoming noticeable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a stereoscopic television apparatus showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional stereoscopic television apparatus. 1... Video/synchronization circuit, 3... Field discrimination circuit, 11... LCD control circuit, 12... Liquid crystal panel for right eye, 13... Liquid crystal panel for left eye, 14... Average brightness detection Part, 15...Analog switch, C...H.
■Output signal, e...Horizontal synchronization signal and vertical synchronization signal, RGB signal, f...Liquid crystal drive control signal, h...R
GB output signal, i: average luminance signal, j: field discrimination signal.

Claims (1)

[Claims] 1. A liquid crystal display means that is displayed on the right-eye and left-eye liquid crystal panels to form an image, and an image/synchronization means that inputs the video signal and performs separation of the luminance signal and color signal, separation of the synchronization signal, and RGB matrix. , RG from the video/synchronization means
a liquid crystal control means for generating an RGB output signal which is a one horizontal period inversion signal or a one vertical period inversion signal of the B signal; an average brightness detection means for detecting average brightness from the RGB output signal from the liquid crystal control means; Field discrimination means for discriminating fields based on a synchronization signal from the synchronization means; and switching between the RGB output signal and the average luminance signal based on the field discrimination signal from the field discrimination means, and outputting the RGB to each liquid crystal panel of the liquid crystal display means. A stereoscopic television device equipped with an analog switch that alternately outputs a signal and an average brightness signal.