KR20130102386A

KR20130102386A - A method of measuring sync signal period and compensating delay time from 3d conversion system using single digital projector and lcd panel

Info

Publication number: KR20130102386A
Application number: KR1020120023583A
Authority: KR
Inventors: 김준배; 장문기
Original assignee: 주식회사 알아이씨
Priority date: 2012-03-07
Filing date: 2012-03-07
Publication date: 2013-09-17

Abstract

The present invention relates to a method of implementing a 3D stereoscopic image, which is recently in increasing demand. In general, a method of implementing a 3D stereoscopic image implements 3D by outputting left and right images using two projectors, respectively. The present invention relates to a method of implementing 3D using only a single digital projector using an LCD panel without using two expensive projectors.
In addition, the present invention relates to an electric shutter system control method of improving the switching speed and durability by controlling the LCD panel with an electrical signal instead of a circular polarizing filter in order to effectively solve the mechanical problems of the prior art.

Description

A method of measuring sync signal period and compensating delay time from 3D conversion system using single digital projector and LCD panel

The present invention relates to a method of implementing a 3D stereoscopic image, which is recently in increasing demand. In general, a method of implementing a 3D stereoscopic image implements 3D by outputting left and right images using two projectors, respectively. The present invention relates to a method of implementing 3D using only a single digital projector using an LCD panel without using two expensive projectors.

In the related art, a 3D stereoscopic image can be largely divided into an active stereo and a passive stereo.

Here, the active stereo method is a method using emitters and LCD shutter glasses for left / right images sequentially displayed in one project, and alternates left and right images made with binocular disparity on the screen. And shutter glasses that perform left and right opening and closing operations in synchronization with this.

The above active stereo method sends an image to the project, so that the project projects each image on the screen, and sends a sync signal corresponding to the projected image to the emitter, and the emitter receiving the sync signal emits shutter glasses when the left image is projected. By transmitting the left lens open signal and the right lens open signal when the right image is projected, the observer sees the right image, the left eye sees the left image, and feels parallax. To be recognized.

In the active stereo system, the stereoscopic effect does not collapse even when the observer freely moves the gaze within the area of the emitter, and a 3D image without ghost phenomenon can be realized through the opening / closing action of the LCD shutter glass.

The passive stereo method can be implemented without using an LCD shutter glass, and the left and right images of two LCD projectors are projected onto non-depolarized screens that do not reduce the polarization effect through respective polarizing filters. In this way, the projected image can implement a stereoscopic image through passive polarized glasses, and can realize a stereoscopic image at a relatively low cost than an active stereo system.

In the passive stereo system, the left and right eye images are separated using a light shielding effect of a combination of orthogonal polarizers, and images are transferred to each eye to recognize a stereoscopic image. The left and right images produced by) are projected by the projector, and the images projected by this projector are polarized by the circular polarization filter attached to the front of the project lens and arrive at the screen, and the left image matches the lens of the left polarized glasses. The polarized light of the right image corresponds to the lens of the right polarized glasses so that when the viewer sees through the polarized glasses, the right eye only sees the right image and the left eye only sees the left image, so that the object can be perceived in three dimensions by feeling binocular parallax. have.

This passive stereo method is a virtual reality stereo image can be implemented at a relatively low cost, using a circular polarizing filter is relatively free to move the observer's eye gaze, and the price of the passive polarized glasses is low price display implementation for a large number of observers Although it is very effective in reducing the transmittance due to the polarization filter, the texture of the image is poor, the image content and the content that wants to see the precise texture has a disadvantage that the three-dimensional feeling falls.

In addition, in order to solve the problems of the above schemes, a combination of the respective schemes is implemented, and there is a simultaneous implementation of the active stereo and passive stereo, the active stereo and passive stereo simultaneous implementation of the active stereo image active stereo Using a DLP projector that can be implemented, it is a method to project the Z-Screen to the non-depolarized screen.

However, in the conventional active stereo system, the circular polarization filter rotation method uses a V-Sync signal provided by the projector to rotate the circular polarization filter at 4320 rpm to match the synchronization signal with the image. Since the circular polarization filter is driven using the signal, synchronization signal delay occurs due to mechanical operation, and in the case of severe signal degradation, the 3D stereoscopic effect is also attenuated. Also, a linear feedback system is used to maintain 4320 rpm. Since it is implemented, a rotation error of 4.32 rpm occurs due to an error of 0.1%, causing a problem of weakening of the 3D image.

Therefore, the present invention has been made to solve the conventional technical problems as described above, the technical problem to be achieved by the present invention is to replace the LCD panel with an electrical signal instead of a circular polarizing filter to effectively solve the mechanical problems described above. This paper proposes an algorithm for an electric shutter system that improves switching speed and durability by controlling.

In order to achieve the above technical problem, the present invention provides a method of controlling a 3D conversion system of a microprocessor in a 3D conversion system using a single digital projector and an LCD panel, wherein the microprocessor inputs a synchronization signal trigger type and a delay time to compensate. Performing a main loop process including receiving and calculating a timer value according to the input compensation delay time, classifying into an interrupt by a capture and an interrupt by a timer, and interrupting by a flag by a flag. And classifying it as a case of CLEAR or SET.

Here, in the step of classifying the interruption by the capture as a case of CLEAR or SET by the flag, when the flag is read as the case of CLEAR, the step of initializing the output to HIGH, and capturing the value in the capture register Storing the value, initializing the capture, adding the bit-inverted capture value and the timer value to the timer register, and setting the flag to SET.

In addition, in the step of classifying the interruption by the capture into the case of CLEAR or SET by the flag, when the flag is read when the flag is SET, the register control value, which is the set value of the capture mode, and the sync signal trigger type value are added up. Storing the data in the capture control register, initializing the timer, and specifying the flag as CLEAR.

In addition, in the classifying into an interrupt by a capture and an interrupt by a timer, in the case of being classified as an interrupt by a timer, the output is set to LOW and the synchronization signal trigger type value is subtracted from the register control value which is a setting value of the capture mode. And storing the data in the capture control register and initializing the timer.

According to the present invention, there is an advantageous effect that the installation cost is reduced compared to the conventional system using two polarizers and a polarizer filter mounted on the front of the projector, and in the case of a conventional product using a single projector rotates the circular polarization filter There is a problem that the manufacturing cost increases or takes additionally for the mechanical operation in the method, but in the case of the liquid crystal shutter polarization method to be achieved in the present invention, since the mechanical operation is not required, the manufacturing cost of the 3D display system is reduced. It is possible to reduce and to improve image quality.

1 is a flow chart illustrating a main loop progress process in an algorithm of a 3D transform system control method according to the present invention.
2 is a flowchart illustrating a process of an interrupt service routine in an algorithm of a method of controlling a 3D conversion system according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the embodiments of the present invention are used only for the purpose of helping the understanding of the present invention, and may be modified in various forms according to the needs of those skilled in the art, and the scope of the present invention is described in the embodiments described below. It should not be construed as limited.

First, in order to accurately control the LCD panel according to a high speed synchronization signal according to the purpose of the present invention, accurate time measurement and parallax compensation according to time delay of a rising or falling signal should be performed.

Therefore, the present invention aims to measure frequency and compensate for parallax using a capture function and a timer function of a microprocessor.

FIG. 1 is a flow chart illustrating a main loop process in an algorithm of a method of controlling a 3D conversion system according to the present invention, and shows a main loop progress in a microprocessor.

In the main loop of the microprocessor, the capture (normal capture compare PWM) function, the timer, and the general purpose input output (GPIO) are initialized and set (step S11). At this time, Capture operates by sync signal.

As shown in FIG. 1, in the loop of the main loop, a trigger type (Trig Type) of a synchronization signal and a delay time to be compensated for are input (steps S12 and S13). Trig type of the synchronization signal means the left and right signals in the 3D image, the timer value (Timer Value) is calculated by the input compensation delay time means a value such as the minimum delay time, delay time step (Step) ( Steps S14 and S15). Here, the compensation delay time is stored in the Timer Value, and the process proceeds to step S12 again to continue the same process.

FIG. 2 is a flowchart illustrating a process of an interrupt service routine (ISR) in an algorithm of a method of controlling a 3D conversion system according to the present invention, and illustrates an ISR process processed by the above-described microprocessor.

As shown in FIG. 2, the interrupt service routine may be classified into an interrupt by capture and an interrupt by timer (step S201).

First, the interrupt processing by Capture will be described.

The interrupt by Capture is branched by a flag, which is divided into the case of CLEAR and the case of SET (step S202).

If the flag is CLEAR in step S202, the output is set to HIGH in an initial state (step S203). The value in the Capture Register (the Capture Register value is a period (frequency) value) is stored in CaptureValue (step S204), and the Capture is initialized (capture inactivation) (step S205). Add the Bitwise inversion CaptureValue and TimerValue values (TimerValue calculated in the Main Loop and the value calculated by the CaptureValue) to store them in the Timer Register (steps S206 and S207), then set the flag (step) S208), the interrupt flag is cleared (step S209).

If the flag is SET in step S202, RegConValue (Register Control Value) and Sync. The value obtained by adding the Trig Type value (0 or 1) is stored in the Capture Control Register (step S210). Where Sync. Trig Type value is the Sync. The value in Trig Type. Next, the timer is initialized, the flag is cleared (steps S211 and S212), and the interrupt flag is cleared (step S209).

Finally, the interrupt processing by the timer in step S201 will be described.

In the case of Interrupt by Timer in step S201, the output is set to LOW (step S213).

After that, in the RegConValue which is the setting value of Capture Mode (Every Rising Edge), Sync. The value obtained by subtracting the Trig Type value (0 or 1) is stored in the Capture Control Register (step S214), and the timer is initialized (step S215). Where Sync. Trig Type value is the Sync. The value in Trig Type. Next, the timer is initialized (step S215), and the interrupt flag is cleared (step S209).

Or more, with reference to the accompanying drawings has been described in detail a preferred embodiment of the present invention.

However, the above-described embodiments are intended to illustrate the present invention, and are not used to limit the scope or meaning of the present invention, and are common in the art to which the present invention pertains within the scope of the claims. Of course, any person with knowledge may be able to make various modifications.

Currently, RealD Co., Ltd. and Korea's Master Image Co., Ltd. are the only one projects that implement stereoscopic images.

The method to be developed in the present invention will be highlighted as a competitive product of RealD's system, which occupies 86% of the North American and European markets in the Asian and other markets when the development is completed with the Liquid Crystal Shutter polarization method of the US RealD. This is expected to boost exports.

In addition, it has grown into a competitive product of RealD, X-panD, and Dolby products, and has led to import substitution corresponding to the conversion of 3D cinemas in domestic digital cinemas, thereby reducing import price effects due to the import substitution effect and the emergence of competitive products. You can expect it.

Claims

A method of controlling a 3D conversion system of a microprocessor in a 3D conversion system using a single digital projector and an LCD panel,
The microprocessor,
Receiving a synchronization signal trigger type and a delay time to compensate;
Performing a main loop process including calculating a timer value by an input compensation delay time,
Interrupt service routine process of the microprocessor,
A first classification step of classifying into an interrupt by a capture and an interrupt by a timer,
A second classification step of classifying the interruption by the capture as a case of CLEAR or SET by the flag when the first classification step is classified as an interruption by the capture;
If the flag is read as CLEAR in the second classification step,
Setting the initial state Output to HIGH, storing the value in the capture register in the capture value, initializing the capture, summing the bit inverted capture value and the timer value and storing it in a timer register, and flags Follow the steps to specify SET,
If the flag is SET in the second classification step,
Summing the register control value, which is the setting value of the capture mode, and the sync signal trigger type value, and storing them in the capture control register, initializing a timer, and specifying a flag as CLEAR,
In the case of being classified as an interrupt by a timer in the first classification step,
Performing an output low, subtracting a sync signal trigger type value from a register control value, which is a set value of a capture mode, and storing it in a capture control register; and initializing a timer. .

The method of claim 1,
And clearing the interrupt flag after the SET setting of the flag, the CLEAR designation of the flag, and the initializing of the timer.

The method of claim 1,
The trigger type of the synchronization signal is a left / right signal in a 3D image,
And the compensation delay time includes a minimum delay time and a delay time interval.