CN1104776A - Liquid crystal spectacles for stereo TV - Google Patents

The liquid crystal spectacles for watching any video display or time-share stereo video image in different systems is composed of frequency generator, frame-frequency converter, phase control circuit, driver and liquid crystal eye lens. The drive frequency of the eye lens is same as the composite frequency of time-share stereo image. Left and right frames of stereo image made by active frequency-phase regulation and synchronous track time sharing are switched to drive the left and right eye lens.

Liquid crystal spectacles for stereo TV

The invention belongs to a kind of viewing apparatus of the stereoscopic video images made from time-sharing procedure, particularly a kind of liquid crystal spectacles for stereo TV.

Be used to watch the three-dimensional television viewing apparatus made from time-sharing procedure at present, all be the principle that has adopted the transmission of passive type frame width of cloth synchronizing signal, driven, i.e. the driving of left and right sides eyepiece must rely on the left and right sides eyepiece synchronized signal of video image institute appendix passively.As the utility model patent of having been authorized by Patent Office of the People's Republic of China: " the three-dimensional production of TV, receiving end Mk " sees 92 years Granted publications for details: 92-8-17 ON:2085587U.This technology is that the framing control signal with left and right image is compound in the television audio signals, demodulates frame width of cloth synchronizing signal again from sound channel, is amplified, in order to drive infrared eyepiece, realizes watching of three-dimensional television.Product as Xi'an Guoyi Stereoscopic Television Co.Ltd: " 3DSYS93-1 " stereotelevision viewing apparatus.Adopted and utilized video channel, frame width of cloth synchronizing signal is apparent in the cursor form under the screen angle of televisor, the wire transmission of finishing the frame frequency synchronizing signal by light/electric transducer, driver drives the liquid crystal eyepiece to realize the reproduction of three-dimensional television image again.Above-mentioned technology or product, following weak point is arranged: in the transmission course of light/electricity conversion, synchronizing signal, because the brightness of TV screen itself changes, image flashes, so that the feature of light/electrical part itself all makes its synchronized signal be interfered, and makes the viewing effect instability.Because synchronized signal adopts the wired electric signal connecting mode, so that brought many inconvenience to the user.Because the restriction of its technology or product itself makes it can not be applicable to the use in public place.

The objective of the invention is to overcome the weak point of above-mentioned technology or product, a kind of liquid crystal spectacles for stereo TV is provided, the open and close of the left and right sides eyepiece of these glasses can be synchronous fully with the demonstration of the left-right frames images of time-sharing procedure stereo video image, and do not need to rely on passively the frame frequency synchronized signal of video image institute appendix.

Principal character of the present invention is: device itself has adopted and display device frame frequency same frequency, (driving frequency that is the liquid crystal eyepiece is identical with time-sharing procedure stereoscopic image frequency synthesis) adopted active frequency, phase place adjustment, and the switching of the left-right frames width of cloth of the stereoscopic video images picture that synchronous track time sharing method is made is to drive left and right eyepiece.It by: frequency generator, frame-rate conversion device, phase-control circuit, driver and liquid crystal eyepiece etc. are formed.Principle of work of the present invention is described below:

Frequency generator of the present invention; Adopt the good crystal oscillating circuit of frequency stability, and the driving frequency and the identical frequency of time-sharing procedure stereoscopic image frequency synthesis of liquid crystal eyepiece have been obtained by frequency dividing circuit, dutycycle is 50% square-wave signal, this signal is again by the frame-rate conversion device, adopted active frequency to adjust mode, switch as required and required synchronous rate signals and export phase-shift circuit to, adjust mode owing to adopted active phase place, suitably adjust phase shift potentiometer W, the phase place of frame synchronization drive signal can be adjusted in 0-180 ° of scope continuously, make its phase place consistent with the phase place of the frame width of cloth synchronizing signal of the stereo video image of display device.The frame width of cloth synchronized signal that makes output by one-level T ' trigger respectively the switching of the left and right frame amplitude of the stereoscopic video images made of synchronous track time sharing method to drive left and right eyepiece.Reproduce with the reduction that realizes stereo video image.

Owing to adopted technique scheme to realize purpose of the present invention: the open and close of the left and right eyepiece of these glasses can be synchronous fully with the demonstration of the left and right frame amplitude image of time-sharing procedure stereo video image, and do not need to rely on passively the left and right eyepiece synchronized signal of video image institute appendix.The present invention compares with product with prior art and has the following advantages;

The present invention adopts integrated technique, and the circuit control section all can be contained in the anaglyph spectacles, has saved the process of passive type synchronizing signal transmission, does not have any electrical equipment and physical property relation with televisor.Fully showed its practicality.

Owing to used the identical fixed frequency of picture frame amplitude-frequency rate with display device, and adopted active Phase Tracking to regulate, so it is easy to use, be not subjected to condition restriction, can many people wear separately, use does not produce interference simultaneously.

Owing to adopted active frequency and phase control, applicable to watching of the time-sharing procedure stereoscopic video images of multiple display device.As: video-projection, computer display etc.

The present invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is an electrical block diagram of the present invention.

Fig. 2 is the embodiments of the invention circuit theory diagrams.

IC is operational amplifier, T1 among the figure ... T4 is the N channel junction field-effect transistors, and T ' is left and right eyepiece for T ' trigger L, R.

Principle of work referring to accompanying drawing 2 embodiment of the invention is as follows;

This device by: frequency generator, frame-rate conversion device, phase-control circuit, driver and left and right eyepiece L, R etc. form.

It is the 1.2288MH fundamental frequency signal that the base frequency oscillation circuit of being made up of operational amplifier IC, quartz crystal, capacitor C 1, C2 in the frequency generator produces frequency, its exact value is determined by building-out capacitor C1, the frequency dividing circuit that the fundamental frequency signal of its generation is formed via T1, T2 and divider etc. produces the 25/30HZ rate signals, the driving frequency that is the liquid crystal eyepiece is identical with the time-sharing procedure stereoscopic image frequency synthesis of corresponding video standard, and (its dutycycle is 50%) exports to the frame-rate conversion device.

Frame-rate conversion device K1 has adopted active frequency to adjust mode, can switch as required required synchronous rate signals and export to phase-control circuit.

Phase-control circuit is made up of T3, T4, C3 and potentiometer W, adjust mode owing to adopted active phase place, suitably adjust phase shift potentiometer W, the phase place of its output signal can be set up arbitrarily between 0-180 °, and is synchronous with the synchronous rate signals and the image display device that guarantee its output.

By T ' trigger in liquid crystal eyepiece driving circuit of the frame width of cloth synchronizing signal of phase-shift circuit output (its state equation is: the frame width of cloth synchronized signal that QN+1=T ' QN+ T ' QN) export respectively the switching of the left-right frames width of cloth of the stereoscopic video images picture of synchronous track time sharing method making to drive left and right eyepiece.(left and right eyepiece is made up of two controllable type liquid crystal light valve sheets) is because 180 ° of the electric phasic differences mutually of the output terminal Q of T ' trigger and Q, so the output terminal Q of T ' trigger and Q end will be distinguished the left and right liquid crystal light valve of driven, in order to the stereoscopic video images of realizing watching time-sharing procedure to make.