JP2013195885A - Driving method of three-dimensional display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving method of a three-dimensional display device capable of displaying stereoscopic images without increasing drive frequency.SOLUTION: Provided is the driving method of a three-dimensional display device using an image display means having a display section for sequentially displaying images for right eye and images for left eye and a pair of glasses for enabling viewing the images for right eye and the images for left eye. On the display section, a step of overdriving data in a first half of a writing period and a step of under-driving data in a second half of the writing period are sequentially repeated.

Description

  The present invention relates to a driving method of a stereoscopic display device configured to be suitable for displaying stereoscopic images.

  Conventionally, various methods have been studied for displaying stereoscopic images. As an example, the video signal for one eye and the video signal for the other eye corresponding to the parallax for visually recognizing the stereoscopic video are alternately displayed on the display device, and the shutter of the glasses unit with the electronic shutter is switched. There is a method for generating a stereoscopic image by the above.

  In this method, the video signal of one screen of stereoscopic video includes the video signal of the first frame in which the image data for one eye (for the right eye) is set and the image data for the other eye (for the left eye). It is separated into the set video signal of the second frame. Then, the video signal of the first frame and the video signal of the second frame are alternately displayed on the display unit by a hold type display method in which the luminance of the previous image is held until the next rewrite signal is input to the pixel unit. Is done. The viewer can recognize a three-dimensional image for one screen through the glasses unit that opens and closes the left and right shutters in synchronization with the first frame and the second frame.

  Specifically, when the video signal of the first frame in which image data for the right eye is set is displayed, the left eye shutter of the glasses unit is closed, and the viewer recognizes the video signal for the right eye, When the video signal of the second frame in which the image data for the left eye is set is displayed, the right eye shutter of the glasses unit is closed and the viewer recognizes the video signal for the left eye. Thereby, the viewer can recognize the stereoscopic video.

JP 2010-210712 A

  In the stereoscopic display device, depending on the timing of the glasses shutter, the video signals for the left and right eyes are mixed and recognized by the viewer, so that the stereoscopic display quality is deteriorated and the video signals are not mixed. When switching between black display and 3D display, it is necessary to increase the drive frequency or erase the displayed images all at once, reducing the brightness and increasing the circuit scale required for driving. It was becoming.

  In view of the above problems, an object of the present invention is to provide a driving method for a stereoscopic display device capable of displaying a stereoscopic video without increasing the driving frequency.

  In order to solve the above problems, a driving method of a stereoscopic display device according to the present invention includes an image display unit having a display unit that sequentially displays an image for the right eye and an image for the left eye, the image for the right eye, and the image for the right eye. A driving method of a stereoscopic display device using glasses for sequentially viewing images for the left eye, wherein in the display unit, a step of overdriving data in the first half of the writing period, and a writing period In the latter half, the step of underdriving data is executed repeatedly in sequence.

  According to the driving method of the stereoscopic display device according to the present invention, it is possible to display a stereoscopic video with little crosstalk and high luminance without increasing the driving frequency.

The block diagram which shows the structure of the three-dimensional display apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the three-dimensional display apparatus in FIG. The block diagram which shows the structure of the spectacles part in FIG. FIG. 1 is a timing chart showing drive timing of the stereoscopic display device shown in FIG. A figure showing an example of the display image FIG. 1 is a timing chart showing driving timings during stereoscopic display of the stereoscopic display device shown in FIG. A figure showing an example of the display image

  Hereinafter, a video display system including a stereoscopic display device according to an embodiment of the present invention will be described with reference to the drawings, taking a liquid crystal display device as an example. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted.

  FIG. 1 is a block diagram showing a configuration of a video display system according to the present invention. As shown in FIG. 1, the video display system 1 includes a display device 11, a video signal output unit 12, and a glasses unit 13. The video display system 1 corresponds to the stereoscopic display device in the present invention, and the display device 11 corresponds to the image display means in the present invention.

  The video signal output unit 12 outputs a video signal to the display device 11 and outputs a synchronization signal to the glasses unit 13. Here, the video signal may be either a stereoscopic video or a planar video. The synchronization signal is a signal for transmitting to the glasses unit 13 whether the video signal output to the display device 11 is image data for the right eye or image data for the left eye.

  FIG. 2 is a block diagram showing a configuration of the display device 11 in FIG. As shown in FIG. 2, the display device 11 includes a video display unit 20, a signal input unit 21, a signal processing unit 22, a control circuit 23, a signal transmission unit 24, a scan signal transfer unit 25, and a signal line. And a drive circuit 26. The video display unit 20, the scan signal transfer unit 25, and the signal line drive circuit 26 correspond to the display unit, the scan line drive unit, and the data line drive unit in the present invention, respectively. The control circuit 23, the scan signal transfer unit 25, and the signal line driving circuit 26 correspond to the display control unit in the present invention.

  The video display unit 20 includes a plurality of lines including a plurality of pixel units 17 and displays a video signal based on image data input from the video signal output unit 12 to the display device 11. Each pixel portion 17 has a gate line Hy (y = 1, 2,..., Y−1, y) for supplying a scanning signal for driving the driving element 17 b and a data line for supplying image data to each pixel portion 17. Vx (x = 1, 2,..., X−1, x) is connected.

  Next, the glasses unit 13 will be described.

  As shown in FIG. 1, the glasses unit 13 includes a right eye shutter 13a and a left eye shutter 13b.

  FIG. 3 is a block diagram illustrating a configuration of the glasses unit 13. As shown in FIG. 3, the glasses unit 13 includes an emitter 30, a signal receiving unit 35, and a shutter switching unit 36. The emitter 30 includes a glasses synchronization control unit 31 and a signal transmission unit 32. Here, the emitter 30 may not be provided in the glasses unit 13, but may be an external configuration, or may be incorporated in the display device 11. Moreover, even if it is not wired connection, the structure by which transmission / reception of a signal is performed by infrared rays etc. may be sufficient, for example.

  The glasses synchronization control unit 31 receives the video synchronization signal output from the display device 11 and the synchronization signal output from the video signal output unit 12, and generates a glasses control signal. The glasses control signal opens either the right eye shutter 13a or the left eye shutter 13b for a predetermined period after the start of the video synchronization signal of each frame, and the right eye shutter 13a that has been opened after the predetermined period has elapsed. Alternatively, it is a control signal for closing the left eye shutter 13b. Thereby, when switching the opening and closing of the right eye shutter 13a and the left eye shutter 13b, the control which makes both the shutters a closed state is performed.

  Thereafter, the glasses synchronization control unit 31 outputs the video synchronization signal and the glasses control signal to the signal transmission unit 32.

  The signal transmission unit 32 further supplies the received video synchronization signal and glasses control signal to the signal reception unit 35. At this time, for example, if the emitter 30 is configured to be externally attached to the glasses unit 13, these signals are transmitted from the signal transmission unit 32 to the signal reception unit 35 of the glasses unit 13 by an infrared communication method.

  Upon receiving the video synchronization signal and the glasses control signal, the signal receiving unit 35 supplies these signals to the shutter switching unit 36. The shutter switching unit 36 controls opening and closing of the right eye shutter 13a and the left eye shutter 13b of the glasses unit 13 by the glasses control signal in synchronization with the video synchronization signal. The opening and closing of the shutter of the glasses unit 13 is, for example, a liquid crystal driving method. In this case, the shutter is opened and closed by controlling the applied voltage. Thus, the viewer can recognize the video signal for the right eye with the right eye and the video signal for the left eye with the left eye. The shutter is not limited to the liquid crystal driving method, and may be a shutter of another driving method.

  Next, the driving operation of the display device 11 will be described using a timing chart.

  FIG. 4 is a timing chart showing the driving timing of one frame of the display device 11 during normal time (planar display), and FIG. 5 is a diagram showing an example of a display image during normal time (planar display). FIG. 6 is a timing chart showing driving timing of one frame of the display device 11 at the time of stereoscopic display, and FIG. 7 is a diagram showing an example of a display image at the time of stereoscopic display. In these figures, the case where the scanning lines of the video display unit 20 are 768 lines is shown as an example. 5 and 7, the hatched portion is a video signal that can be viewed by the viewer.

  As shown in FIGS. 4 and 5, in planar display, an H level drive signal (pulse signal) is always supplied from the scanning line drive circuit 25 to the selection element of the pixel unit 17. Thereby, the display apparatus 11 will be in an image display state. The drive signal supplied to the selection element 17 may be in an image display state when it is at the L level.

  Then, an H level pulse signal is sequentially supplied to each line by the first scanning line driving circuit 25, and image data corresponding to each pixel unit 17 is simultaneously supplied from the signal line driving circuit 26. In this way, a 2D image for one frame is displayed on the video display unit 20.

  Also, as shown in FIGS. 6 and 7, in stereoscopic display, a video signal corresponding to the left eye of one frame is displayed, and scanning line driving is performed during a period in which image data corresponding to the right eye is written. A drive signal (pulse signal) of L level and H level is supplied from the circuit 25 to the selection element of the pixel portion 17. Thereby, the display device 11 enters an image non-display state. During the same period, the scanning line driving circuit 25 supplies an H level pulse signal to each line in order.

  Subsequently, during the first half period in which image data is written, an H level drive signal (pulse signal) is supplied from the scanning line drive circuit 25 to the selection element of the pixel portion 17 and at the same time, signal line drive is performed. The image data corresponding to each pixel unit 17 is supplied from the circuit 26 underdrive. In the latter half of the period when image data is written, an H level driving signal (pulse signal) is supplied from the scanning line driving circuit 25 to the selection element of the pixel portion 17 and at the same time, the signal line driving circuit. 26, image data corresponding to each pixel unit 17 is overdriven and supplied. As a result, the display device 11 is supplied with an H level pulse signal by which the scanning time is artificially shortened by the scanning line driving circuit 25.

  In other words, under the control of the control circuit 23, the video switching is intentionally delayed by underdrive in the first half of scanning and the video switching speed is increased by overdriving in the second half of scanning, whereby the image to the pixel unit 17 of all lines is displayed. A 3D image is displayed on the video display unit 20 by artificially shortening the data writing time.

  FIG. 7 is a diagram showing an example of a display image displayed by the above scanning.

  With such a driving method, even in the case of stereoscopic display, a stereoscopic image with high luminance can be obtained by increasing the opening time of the glasses without increasing the driving frequency of the video signal.

  As described above, the driving method of the stereoscopic display device according to the present invention includes the image display means having the display unit for sequentially displaying the right-eye image and the left-eye image, the right-eye image, and the left-eye image. A method of driving a stereoscopic display device using glasses capable of sequentially viewing the images of the display, wherein the display unit lowers the data drive capability and underdrives the row from the first line to the middle of the screen. The scanning time for all the lines is shortened in a pseudo manner by improving the data drive capability from the middle stage to the last line and overdriving. As a result, when scanning from the top of the display unit, the video change can be delayed at the top of the display unit, and the video change is accelerated at the bottom of the display unit. The crosstalk can be reduced. Further, since the operation time can be shortened in a pseudo manner, the opening time of the glasses can be increased, and the brightness of the stereoscopic image can be improved.

  The driving method of the stereoscopic display device according to the present invention is useful for improving the image quality of stereoscopic images.

DESCRIPTION OF SYMBOLS 1 Video display system 11 Display apparatus 13 Glasses part 20 Video display part 23 Control circuit 25 Scan signal transfer part 26 Signal line drive circuit

Claims (1)

Three-dimensional display using image display means having a display unit for sequentially displaying an image for the right eye and an image for the left eye, and glasses capable of sequentially viewing the image for the right eye and the image for the left eye In the driving method of the apparatus, in the display unit, the step of overdriving data in the first half of the writing period and the step of underdriving data in the second half of the writing period are sequentially and repeatedly executed. A driving method of a featured stereoscopic display device.

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