JPH04132489A - Liquid crystal drive circuit - Google Patents

Abstract

PURPOSE:To attain stereoscopic vision when a software for stereoscopic vision is inputted by distributing an RGB output signal into right and left eye RGB output signals through the changeover of a switch based on a field discrimination signal and outputting the result. CONSTITUTION:The above circuit is provided with a field discrimination circuit 10 discriminating a field based on a horizontal and vertical composite synchronizing signal of a video synchronization circuit 2, a field delay circuit delaying the RGB output signal by one field, and a switch 14 receiving an RGB output signal passing through the field delay circuit 12 and an RGB output signal not therethrough and selecting either of the RGB output signals based on a field discrimination signal outputted from the field discrimination circuit 10 so as to output the right and left eye RGB output signals. Thus, stereoscopic vision is realized when a software for stereoscopic vision is inputted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal drive circuit that applies diversified liquid crystal display elements.

2. Description of the Related Art In recent years, liquid crystal drive circuits have been reduced in size due to high-density packaging of circuits.

Hereinafter, without reference to FIG. 2, an example of the above-mentioned conventional liquid crystal drive circuit will be described. The conventional liquid crystal drive circuit is
A video/synchronization circuit 2 inputs the video signal 1 and performs separation of the luminance signal and color signal, synchronous separation, and RGB matrix, and two images for the right eye and left eye from the signal synchronously separated by the video/synchronization circuit 2. The reference clock that drives the liquid crystal panel 6.7, the horizontal and vertical sampling start pulses, the gate pulse, the common inversion signal 4, and the RGB signal 1
A signal (RG
It was equipped with a liquid crystal display control circuit (hereinafter abbreviated as LCD control circuit) 3 which generates a Bffl power signal) 8.

The right-eye and left-eye liquid crystal panels 6.7 are each driven by a reference clock, horizontal/vertical sampling start pulses, gate pulses, common inversion signal 4, and RGB output signal 8 input via the transistor 8a. A convex lens was used to magnify the image so that it could be viewed with either binoculars or one eye. In addition, two LCD panels 6
．． In the case of a 7 or delta arrangement, a phase delay circuit 5 may be provided to delay the timing of the reference clock and the horizontal/vertical sampling start pulse by half a pixel every horizontal scanning period, and FIG. 2 shows the second case. ing.

However, in the conventional liquid crystal drive circuit described above, since the RGB output signals that drive the right-eye and left-eye liquid crystal panels 6.7 are the same, it is difficult to input stereoscopic video software. However, there was the issue of not being able to see it in 3D.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a liquid crystal drive circuit that provides stereoscopic viewing when stereoscopic viewing software is input.

Means for Solving the Problems In order to solve the above problems, the liquid crystal drive circuit of the present invention inputs a video signal and separates a luminance signal and a color signal, performs synchronization separation,
The video/synchronization circuit that performs RGB matrix and this video/synchronization circuit.
RGB is obtained by inverting the reference clock for driving the liquid crystal panel, horizontal/vertical sampling start pulses, gate pulses, common inversion signals, and RGB signals for one horizontal scanning period or one vertical scanning period from the signals synchronously separated by the synchronous circuit.
a liquid crystal display control circuit that generates an output signal, and a liquid crystal display control circuit that generates an output signal;
A field discrimination circuit that discriminates the field from the horizontal/vertical composite synchronization signal of the synchronization circuit;
A field delay circuit that delays the field is connected to the subsequent stage of the field delay circuit, and inputs RGB output signals that have passed through the field delay circuit and RGB output signals that have not passed through the field delay circuit, and also inputs these RGB output signals from the field discrimination circuit. The device includes a switch that outputs an RGB output signal for the right eye and an RGB output signal for the left eye by switching based on the field discrimination signal that is output.

Effect In the above configuration, when the video signal of the stereoscopic video software is input, the LCD control circuit sends the R for the right eye and the R for the left eye.
The GB output signals are applied in a state in which they are alternately combined for each field. This RGB output signal is divided into an RGB output signal for the right eye and an RGB output signal for the left eye by switching a switch based on the field discrimination signal output from the field discrimination circuit, and is outputted by the field delay circuit. l field delayed R
The GB output signal is also divided by the switch into an RGB output signal for the right eye and an RGB pressure signal for the left eye and output.

As a result, the RGB output signal for the right eye and the RGB output signal for the left eye are each continuously output from the switch to each LCD panel, and both LCD panels receive the reference clock, horizontal/vertical sampling start pulse, gate pulse, and common inversion signal. , and the RGB output signals for the right eye and the left eye, respectively. Therefore, by viewing both liquid crystal panels with your right and left eyes, you can view stereoscopic software in 3D.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. In addition, the same numbers are given to the same parts as the conventional liquid crystal drive circuit.
The explanation will be omitted.

FIG. 1 is a block diagram of a liquid crystal drive circuit according to an embodiment of the present invention. As shown in FIG. 1, the liquid crystal drive circuit includes, in addition to the conventionally provided video/synchronization circuit 2, LCD control circuit 3, phase delay circuit 5, and liquid crystal panels 6.7 for the coarse right eye and the left eye. A field discrimination circuit 10 that discriminates a field from the horizontal/vertical composite synchronization signal 9 of the video/synchronization circuit 2; a field delay circuit 12 that delays the RGB output signal 8 by one field; and this field delay circuit 12.
An RGB output signal 13 that is connected to the subsequent stage and has passed through the field delay circuit 12, and an RGB output signal 8 that has not passed through the field delay circuit 12.
and these RGB output signals 8.13
It is configured to include an analog switch 14 which switches and outputs the signal to the right-eye and left-eye liquid crystal panels 6.7 based on the field discrimination signal 11 output from the field discrimination circuit 10.

In the above configuration, when a video signal of stereoscopic video software is input, the LCD control circuit 3 outputs RGB output signals for the right eye and for the left eye in a state in which they are alternately combined for each field. Then, this RGB output signal 8 is divided into an RGB output signal 15 for the right eye and an RGB output signal 16 for the left eye by switching the analog switch 14 based on the field discrimination signal 11 output from the field discrimination circuit 10, and is output. be done. Along with this, RGB is delayed by one field by the field delay circuit 12.
The output signal 8 is also set to RG for the right eye by the analog switch 14.
The RGB output signal 15 for the right eye and the RGB output signal 16 for the left eye are output from the analog switch 14 by being distributed to the B output signal 15 and the RGB output signal 16 for the left eye. output to the LCD panel 6.7. Each liquid crystal panel 6.7 has RGB for the right eye along with a reference clock, horizontal/vertical sampling start pulse, gate pulse, common inversion signal 4, etc.
They are driven separately by the output signal 15 and the left-eye RGB output signal 16, and by viewing both of these liquid crystal panels 6.7 with the right and left eyes, stereoscopic software can be viewed stereoscopically.

Incidentally, if the pixels of the two liquid crystal panels 6 and 7 are not arranged in a delta arrangement, it is not necessary to provide the phase delay circuit B5.

Effects of the Invention As described above, according to the present invention, in addition to the conventionally provided video/synchronization circuit, LCD control circuit, and liquid crystal panels for right and left eyes, horizontal/vertical composite synchronization of the video/synchronization circuit is provided. A field discrimination circuit that discriminates a field from a signal, a field delay circuit that delays the RGB output signal by one field, and an RGBffl power signal that is connected to the subsequent stage of this field delay circuit and that has passed through the field delay circuit and an RGB output signal that has not passed through the field delay circuit. and a switch that outputs an RGB output signal for the right eye and an RGB output signal for the left eye by switching these RGB output signals based on the field discrimination signal output from the field discrimination circuit. Therefore, when inputting stereoscopic viewing software, you can see stereoscopic images and see good images without flickering.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a liquid crystal drive circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional liquid crystal drive circuit. l...Video signal, 2...Video/synchronization circuit, 3...
LCD screen control circuit (liquid crystal display control circuit), 4: reference clock, horizontal/vertical sampling start pulse, gate pulse, common inversion signal, 6: liquid crystal panel for right eye, 7: liquid crystal panel for left eye , 8... RGB output signal, 9... Horizontal/vertical composite synchronization signal, 10... Field discrimination circuit, 11... Field discrimination signal, 12...
・Field delay circuit, 13...1' field delay RGB output signal, 14...analog switch, 15.
...RGB output signal for right eye, 16...RGB output signal for left eye.

Claims (1)

[Claims] 1. A video/synchronization circuit that inputs a video signal and performs separation of the luminance signal and color signal, synchronous separation, and RGB matrix, and a reference clock for driving the liquid crystal panel from the signal synchronously separated by this video/synchronization circuit. Horizontal/vertical sampling start pulse, gate pulse, common inversion signal and RG
a liquid crystal display control circuit that generates an RGB output signal obtained by inverting the B signal for one horizontal scanning period or one vertical scanning period; a field discrimination circuit that discriminates a field from a horizontal/vertical composite synchronization signal of the video/synchronization circuit; A field delay circuit that delays the RGB output signal by one field, and an RGB output signal that is connected after this field delay circuit and that has passed through the field delay circuit and an RGB that has not passed through the field delay circuit.
RGB for the right eye is input by inputting an output signal and switching these RGB output signals based on a field discrimination signal output from the field discrimination circuit.
It is equipped with a switch that outputs an output signal and an RGB output signal for the left eye, and the two liquid crystal panels for the right eye and the left eye are connected to the reference clock, horizontal/vertical sampling start pulse, gate pulse, and common inversion signal. A liquid crystal drive circuit driven by the signal, the RGB output signal for the right eye, and the RGB output signal for the left eye.