KR102143944B1 - Method of adjusting three-dimensional effect and stereoscopic image display using the same - Google Patents

Abstract

The present invention relates to a three-dimensional effect adjustment method and a stereoscopic image display device using the same, wherein the left-eye image data and the right-eye image data are adjusted by adjusting the positive depth using a first parameter and adjusting the negative depth using a second parameter. Changing the disparity of and not changing left-eye and right-eye image data of zero depth; Transmitting pixel data of a left-eye image and a right-eye image in which the positive depth and the negative depth are adjusted, and left-eye and right-eye image data of zero depth to a data driving circuit; And supplying a data voltage of the pixel data output from the data driving circuit to data lines of the display panel.

Description

A method for adjusting a three-dimensional effect and a three-dimensional image display device using the method {METHOD OF ADJUSTING THREE-DIMENSIONAL EFFECT AND STEREOSCOPIC IMAGE DISPLAY USING THE SAME}

The present invention relates to a three-dimensional effect adjustment method and a three-dimensional image display device using the same.

3D image reproduction technology has been applied to display devices such as TVs and monitors, allowing 3D stereoscopic images to be enjoyed even at home. The stereoscopic image display device may be divided into a glasses type and a non-glasses type. The glasses method displays a three-dimensional image by changing the polarization direction of left and right parallax images on a direct-view display device or projector or by using a time division method, and uses polarized glasses or shutter glasses to implement a stereoscopic image. Optical components such as a parallax barrier and a lenticular lens for separation are installed in front of or behind the display screen to realize a 3D image.

The stereoscopic image display device provides a user interface through which a user can adjust the stereoscopic effect. The user can adjust the depth and focus of the 3D image through the user interface. The 3D image display device adjusts the 3D effect by adding or multiplying the parameter value input from the user to the depth.

The three-dimensional effect that can be felt from the 3D image displayed on the three-dimensional image display device may be adjusted by disparity. When disparity is adjusted, depth is adjusted. As shown in FIGS. 1 and 2, the depth is divided into a negative depth in which a virtual image of an object is formed in the front direction of the screen and a positive depth in which an image of an object is formed behind the screen.

In FIG. 1,'S' denotes pixel data of a left-eye image (hereinafter referred to as "left-eye pixel (L)") and pixel data of a right-eye image (hereinafter, "right-eye pixel (R)") for the same object displayed on the screen. It is a disparity expressed as a distance between the two. When a viewer sees the left eye pixel with the left eye and the right eye pixel with the right eye, the viewer feels a three-dimensional effect due to binocular parallax. 'D' is the distance between the screen and the user, and'l' is the distance between the user's eyes (6~7cm). 'd' is the depth between the screen and the convergence point, that is, the depth. The convergence point is located at the focal length of the viewer's left and right eyes. The viewer perceives the position of the virtual image of the object as the position at the convergence point. The screen is a zero parallax.

Negative depth causes an illusion of an object to form between the viewer and the screen. The light path between the viewer's left and left eye pixels (hereinafter referred to as "L light path") and the viewer's right eye and right eye pixels (hereinafter referred to as "R light path") cross the front of the screen. When negative depth is implemented. Accordingly, the positions of the left-eye and right-eye pixels in the negative depth are the same as the left circular object of FIG. 3. In the geometric analysis as shown in FIG. 1, the negative depth can be expressed as d = (S×D)/(I+S).

Positive depth causes the virtual image of an object to form behind the screen. The L light path and the R light path meet at the convergence pointer located behind the screen. Therefore, the positions of the left-eye and right-eye pixels in the positive depth are the same as those of the triangular object of FIG. 3. In the geometric analysis as shown in FIG. 1, the positive depth may be represented by d = (S×D)/(I-S).

In FIG. 3, a square object is a zero depth object without disparity between a left-eye pixel and a right-eye pixel. The convergence point of the rectangular object is located on the screen.

The conventional method for adjusting the three-dimensional effect changes the three-dimensional effect that the user feels by changing the distance and the degree of intersection between the left-eye pixel and the right-eye pixel, that is, disparity. However, the conventional method of adjusting the three-dimensional effect may distort the three-dimensional effect because the same parameter value is added or multiplied regardless of the depth type or the user's three-dimensional effect perception characteristic. For example, in the conventional stereoscopic value adjustment method, the same parameter value is added or multiplied to all depths of a 3D image including negative depth, zero depth, and positive depth. Since the zero depth has zero disparity, there is no three-dimensional effect because the convergence point is located on the screen. In this method, the three-dimensional effect that the user feels is different for the negative depth and the positive depth, and the three-dimensional effect is distorted by giving a three-dimensional effect to the zero depth.

The present invention provides a three-dimensional effect adjustment method and a three-dimensional image display device using the same, in which three-dimensional effect is reduced in consideration of a viewer's three-dimensional effect when adjusting the three-dimensional effect.

The image data generation method of the present invention includes the steps of separating left-eye image data and right-eye image data from stereoscopic image data; Determining a positive depth and a negative depth of the input stereoscopic image data; The positive depth is adjusted using a first parameter and the negative depth is adjusted using a second parameter to change the disparity of the left-eye image data and the right-eye image data, and the left-eye and right-eye image data of zero depth are changed. Steps not to be taken; Transmitting pixel data of a left-eye image and a right-eye image in which the positive depth and the negative depth are adjusted, and left-eye and right-eye image data of zero depth to a data driving circuit; And supplying a data voltage of the pixel data output from the data driving circuit to data lines of the display panel.
The second parameter is greater than the first parameter.

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The stereoscopic image display device of the present invention separates the left-eye image data and the right-eye image data from the stereoscopic image data to determine the positive depth and the negative depth of the input stereoscopic image data, and adjusts the positive depth using a first parameter. An image adjusting device that adjusts the negative depth using a 2 parameter to change the disparity of the left-eye image data and the right-eye image data, and does not change the left-eye and right-eye image data of zero depth; And a data driving circuit that receives pixel data of a left-eye image and a right-eye image in which the positive depth and the negative depth are adjusted, and the left-eye and right-eye image data of zero depth, converts it into a data voltage, and outputs the data to data lines of the display panel. Include.
The image adjustment device expresses the negative depth as a higher grayscale as the depth of the negative depth is greater, and the disparity map image expresses the positive depth as a lower grayscale as the depth is greater in the positive depth. Create

In the present invention, a parameter for adjusting a negative depth and a parameter for adjusting a positive depth may be independently set to reduce distortion of a three-dimensional effect when adjusting a three-dimensional effect.

1 to 3 are diagrams showing negative depth and positive depth for realizing a three-dimensional effect.
4 is a diagram showing a viewer's three-dimensional perception depth that changes according to disparity in a negative depth.
FIG. 5 is a diagram showing a viewer's three-dimensional perception depth that changes according to disparity in a positive depth.
6 is a flowchart showing a control procedure of a method for adjusting a three-dimensional effect according to an embodiment of the present invention.
7 is a diagram showing examples of a 3D image data format.
8 is a diagram showing parameters for adjusting the positive depth and the negative depth.
9 is a block diagram showing a 3D image display device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals throughout the specification mean substantially the same elements. In the following description, when it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Prior to the description of the embodiment, some terms used in the embodiment will be defined as follows.

Disparity is a distance between pixel data implementing binocular parallax, and is a distance between a left-eye pixel and a right-eye pixel for the same object displayed on the screen.

The present invention implements disparity by a shift amount of pixel data visible from the left eye and pixel data visible from the right eye.

FIG. 4 is a 3D perception depth (y-axis) of a viewer that changes according to disparity (x-axis) in negative depth. 5 is a perspective view of a viewer's three-dimensional perception depth (y-axis) that changes according to disparity (x-axis) in positive depth.

Referring to FIGS. 4 and 5, the three-dimensional effect that a viewer feels may be changed by adjusting disparity. However, it is completely different in the same disparity change in negative depth and positive depth. This has been introduced in "Depth perception in stereoscopic displays (authors Robert Patterson, Steve Becker, G. Scott Boucek, and Ray Phinney)" disclosed in Journal of the SID, 2/2, 1994.

The negative depth gradually increases as the disparity increases and converges to a certain depth value, but the positive depth increases rapidly as the disparity increases. As a result, if the disparity is changed by the same amount in the negative depth and the positive depth, the amount of change in the positive depth becomes significantly larger than that of the negative depth. Therefore, when the same parameter is added or multiplied in the negative depth and the positive depth, as in the conventional method for adjusting the three-dimensional effect of the prior art, the three-dimensional effect is severely distorted when compared to the three-dimensional effect of the original 3D image. In addition, the conventional three-dimensional effect adjustment method of the prior art adds or multiplies the parameters applied to the negative depth and the positive depth to the object on the screen with Disparity = 0 (zero) without the three-dimensional effect, so that the distortion of the three-dimensional effect is more severe. In order to prevent such a problem of the prior art, the method of adjusting the three-dimensional effect of the present invention adjusts the depth by applying different parameters to the negative depth and the positive depth in consideration of the viewer's three-dimensional effect perception characteristics as shown in FIGS. 4 and 5. Do not adjust the depth for objects on the screen with Disparity = 0 (zero).

6 is a flowchart showing a control procedure of a method for adjusting a three-dimensional effect according to an embodiment of the present invention. 7 is a diagram showing examples of a 3D image data format.

6 and 7, the method for adjusting a three-dimensional effect of the present invention receives three-dimensional image data including a 3D image and separates left-eye image data and right-eye image data (S1 and S2). The three-dimensional image data for one frame includes left-eye image data and right-eye image data as shown in FIG. 7.

In the data format as shown in FIG. 7A, one frame data is divided into two left and right, and left-eye image data LEFT is allocated to the left half and right-eye image data RIGHT is allocated to the right half. In the data format as shown in FIG. 7B, one frame data is divided into two vertically, and left-eye image data LEFT is allocated to the upper half and right-eye image data RIGHT is allocated to the lower half. In the data format shown in FIG. 7C, one frame data is divided into check pattern-shaped blocks and left-eye image data LEFT and right-eye image data RIGHT are allocated to neighboring blocks. The method for adjusting the three-dimensional effect of the present invention divides the left-eye image data (LEFT) and the right-eye image data (RIGHT) for each 1/2 frame from one frame data in step S2, and then interpolates the left-eye image data and the right-eye image data. can do.

Subsequently, in the method of adjusting the three-dimensional effect of the present invention, a disparity map image is generated by calculating disparity of the left-eye image data and the right-eye image data. (S3) In the disparity map image, the depth is grayscale. Is expressed. In the negative depth protruding from the screen toward the viewer, the higher the disparity is, the higher the gray scale (or white gray scale) is expressed. On the other hand, in a positive depth that is further away from the screen, the greater the disparity is, the lower the grayscale (or black grayscale) is expressed.

The method for adjusting the three-dimensional effect of the present invention adjusts the three-dimensional effect according to the characteristics of a display panel or when a viewer desires. When 3D effect adjustment is required, the 3D effect adjustment method of the present invention analyzes a disparity map to determine the depth of 3D image data, selects a first parameter (Fig. 8, a) to be applied to the positive depth, and selects a second parameter for the negative depth. The parameters (Fig. 8, b) are selected (S4, S5a, S5b). Subsequently, in the method of adjusting the three-dimensional effect of the present invention, the positive depth is adjusted using the first parameter (a), and the negative depth is adjusted using the second parameter (b). In this case, the method for adjusting the three-dimensional effect of the present invention does not adjust the zero depth (S6).

Subsequently, in the method of adjusting the three-dimensional effect of the present invention, the disparity of the left-eye image data and the right-eye image data is changed and displayed on the display panel based on the disparity map image whose depth is adjusted (S7 and S8).

As shown in FIG. 8, the three-dimensional effect that the viewer feels is significantly changed even with a small disparity change in the positive depth compared to the negative depth. Accordingly, in the method of adjusting the 3D effect of the present invention, the second parameter (b) to be applied to the negative depth is set to a value larger than the first parameter (a) to be applied to the positive depth in consideration of the viewer's 3D perception characteristic.

The first and second parameters a and b may be set to values optimized in advance according to a display panel characteristic measured through an experiment on a viewer's 3D perception characteristic. Accordingly, the first and second parameters a and b may vary according to the characteristics of the display panel. In addition, the first and second parameters a and b may be changed by the viewer through the user interface.

The stereoscopic image display device of the present invention includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode display (Organic Light). It can be implemented based on flat panel display devices such as Emitting Display, OLED), and Electrophoresis (EPD). The stereoscopic image display device of the present invention may be implemented as an autostereoscopic stereoscopic image display device or a glasses stereoscopic image display device, and displays 2D image data in 2D mode and 3D image data in 3D mode. A 3D optical element may be attached to the display panel of the stereoscopic image display device. The three-dimensional image display device of the glasses type may be implemented as a polarizing glasses method or a shutter glasses method.

The 3D optical element is an optical element that separates subpixels seen through the viewer's left eye and subpixels seen through the right eye in a glasses-free method, and may be an optical component such as a parallax barrier or a lenticular lens. In addition, the 3D optical device may be a pattern retarder or an active retarder that converts polarization characteristics of a left-eye image and a right-eye image differently in the glasses method. The parallax barrier and the lenticular lens may be implemented as a switchable barrier or a switchable lens electrically controlled using a liquid crystal panel. The applicant of the present application has proposed a switchable barrier and a switchable lens through US application 13/077565 and US application 13/325272. The glasses method requires 3D glasses such as polarized glasses or shutter glasses.

9 is a block diagram showing a 3D image display device according to an embodiment of the present invention. In FIG. 9, 3D optical elements and 3D glasses are omitted.

Referring to FIG. 9, the stereoscopic image display device of the present invention includes a display panel 100, a display panel driver, and a three-dimensional effect adjusting device 110.

The display panel 100 includes a pixel array in which data lines and scan lines (or gate lines) are orthogonal and pixels are arranged in a matrix form. The pixel array displays 2D images in 2D mode, and displays left and right eye images in 3D mode.

The display panel driver applies a data driving circuit 102 for supplying data voltages of 2D/3D images to the data lines of the display panel 100 and a scan pulse (or gate pulse) to the scan lines of the display panel 100. It includes a scan driving circuit 104 for sequentially supplying, and a timing controller 120 for controlling the driving circuits 102 and 104. The display panel driver writes left-eye and right-eye image data whose disparity is variable by the three-dimensional effect adjustment apparatus 110 by distributing temporally or spatially to pixels of the display panel 100.

The data driving circuit 102 converts digital video data input from the timing controller 120 into an analog gamma voltage, generates data voltages, and supplies the data voltages to data lines of the display panel 100. In the case of a liquid crystal display device, the data driving circuit 102 may invert the polarity of data voltages supplied to the data lines under the control of the timing controller 120. The scan driving circuit 104 supplies scan pulses synchronized with data voltages supplied to the data lines to the scan lines under the control of the timing controller 120 and sequentially shifts the scan pulses.

The timing controller 120 supplies digital video data of a 2D/3D input image input from the host system 200 to the data driving circuit 102. In addition, the timing controller 120 receives timing signals such as a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a main clock input from the host system 200 in synchronization with digital video data of a 2D/3D input image. , Using the timing signal, the operation timing of the display panel drivers 102 and 103 is controlled.

The timing controller 120 can control the operating frequency of the display panel drivers 102 and 103 at a frame rate multiplied by N times by increasing the frame frequency of the input image to a frame frequency of N (N is a positive integer of 2 or more) Hz. have. The frame frequency of the input image is 60 Hz in the NTSC (National Television Standards Committee) method and 50 Hz in the PAL (Phase-Alternating Line) method.

The 3D control apparatus 110 receives 3D image data in the format shown in FIG. 7 from the host system 200. The three-dimensional effect control device 110 adjusts the negative depth and the positive depth excluding the zero depth using the first and second parameters (a, b) according to the control procedure as shown in FIG. 6 to display the left-eye image data and the right-eye image data. Change parity. The left-eye image data and right-eye image data reconstructed by the three-dimensional effect adjustment device 110 are transmitted to the data driving circuit 102 through the timing controller 120.

The host system 200 may be implemented as any one of a TV system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 200 uses a scaler to display digital video data of a 2D/3D input image to the user data input through a user interface (not shown). The host system 110 matching the resolution of the display panel 100 In response, a mode signal is transmitted to the timing controller to switch between 2D mode operation and 3D mode operation.

The viewer can adjust the three-dimensional effect through the user interface 210. The host system adjusts the first and second parameters (a, b) according to the amount of 3D effect input through the user interface 210 and transmits it to the image adjustment device 110. The user interface 210 includes a keypad, a keyboard, a mouse, an on-screen display (OSD), a remote controller, a graphic user interface (GUI), a touch user interface (UI), and voice recognition. It can be implemented as a UI or a 3D UI.

It will be appreciated by those skilled in the art through the above description that various changes and modifications can be made without departing from the technical idea of the present invention. Accordingly, the present invention should not be limited to the content described in the detailed description, but should be defined by the claims.

100: display panel 110: image adjustment device
102: data driving circuit 104: scan driving circuit
120: timing controller 200: host system

Claims (7)

Separating left-eye image data and right-eye image data from the stereoscopic image data;
Determining a positive depth and a negative depth of the stereoscopic image data;
The positive depth is adjusted using a first parameter and the negative depth is adjusted using a second parameter to change the disparity of the left-eye image data and the right-eye image data, and the left-eye and right-eye image data of zero depth are changed. Steps not to be taken;
Transmitting pixel data of a left-eye image and a right-eye image in which the positive depth and the negative depth are adjusted, and left-eye and right-eye image data of zero depth to a data driving circuit; And
Supplying a data voltage of the pixel data output from the data driving circuit to data lines of the display panel,
The second parameter is greater than the first parameter,
The step of determining the positive depth and the negative depth of the stereoscopic image data,
The step of generating a disparity map image expressing the positive depth as a low grayscale as the depth of the negative depth has a higher disparity, the higher the grayscale and the greater the disparity in the positive depth. Three-dimensional control method comprising a. delete delete The left-eye image data and the right-eye image data are separated from the stereoscopic image data to determine the positive depth and the negative depth of the stereoscopic image data, and the positive depth is adjusted using a first parameter, and the negative depth is determined using a second parameter. An image adjustment device that adjusts to change the disparity of the left-eye image data and the right-eye image data, and does not change the left-eye and right-eye image data of zero depth; And
A data driving circuit that receives pixel data of a left-eye image and a right-eye image with the positive depth and negative depth adjusted, and the left-eye and right-eye image data of zero depth, converts it into a data voltage, and outputs it to data lines of a display panel. and,
The second parameter is greater than the first parameter,
The image adjustment device,
In the negative depth, as the depth of the disparity is greater, the negative depth is expressed as a high grayscale, and as the depth in the positive depth, the disparity is high, a disparity map image that expresses the positive depth as a low grayscale is generated. 3D video display device.
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