KR100623726B1 - Stereopsis Liquid Crystal Display Device in Field-Sequential Driving and Method of Driving the same - Google Patents

Abstract

A stereoscopic image liquid crystal display device having a field sequential driving method capable of obtaining a high resolution is disclosed. The present invention time-divisionally applies the left-eye image and the right-eye image to the liquid crystal display panel in the driver, and separates one frame into at least two sub-frames by using an electro-optic element to separate the space. It emits red, green and blue in the subframe. Therefore, since the left eye / right eye image is time-divisionally displayed by one pixel, it has an effect having three times or more resolution than the conventional stereoscopic liquid crystal display device.

Stereoscopic image, field sequential driving method, liquid crystal display device.

Description

Stereoscopic Liquid Crystal Display Device in Field-Sequential Driving and Method of Driving the same

1 is a block diagram illustrating a stereoscopic image liquid crystal display device of a field sequential driving method according to an embodiment of the present invention.

2 is a perspective view illustrating an electro-optic prism of the stereoscopic image liquid crystal display device of the field sequential driving method according to the embodiment of the present invention.

3 is a timing diagram illustrating a method of driving a stereoscopic image liquid crystal display device having a field sequential driving method according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a path through which right eye image data is delivered to a viewer.

5 is a diagram illustrating a path through which left eye image data is delivered to a viewer.

The present invention relates to a three-dimensional image liquid crystal display device of the field sequential driving method, and more specifically, the left eye image and the right eye image are space-separated using time division and electro-optic elements as well as field sequential driving. The present invention relates to a stereoscopic image liquid crystal display device having a field sequential driving method capable of obtaining a high resolution by applying the method.

In general, a stereoscopic image display allows a user to recognize a displayed image in three dimensions. Generally, recognition of a three-dimensional stereoscopic image is felt by a slight image difference between the left and right eyes of the user. You lose.

According to this principle, various types of stereoscopic image displays are under research and development. According to the type of stereoscopic display, the stereoscopic display and the ballistic display are largely classified according to the type of data information for displaying the stereoscopic image. Volumetric Display, Holographic Display.

Among them, the stereoscopic stereoscopic display device mainly generates a slight spatial difference in the image incident to the left eye and the right eye, so that two different lights incident to both eyes enter the retina due to the control of the muscles around the eye. It is a method of properly recognizing three-dimensional images. As an example of a stereoscopic image display apparatus of this type, US Patent No. 5,774, 262 discloses a display apparatus for separating left and right eye images displayed on a liquid crystal display using a prism. However, since the stereoscopic type stereoscopic image display device having the above-described configuration has to simultaneously display an image of a right eye image and a left eye image on a liquid crystal display panel, the resolution of the viewer viewing the image is reduced to less than half. have.

In order to solve the problem, Korean Patent Laid-Open Publication No. 2003-0075321 discloses a stereoscopic image display apparatus which prevents resolution degradation by separating images of left and right eyes using a time division method and an electro-optic device. The domestic patent has the same resolution as a two-dimensional image display device using a conventional color filter. However, with the recent trend of miniaturization of video stereoscopic image display apparatuses and the spread of moving images, there is an urgent need for the development of new stereoscopic image display apparatuses having higher resolution than the stereoscopic image display apparatus disclosed in the above-mentioned Korean Patent Publication.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a stereoscopic image liquid crystal display device using a field sequential driving method for high resolution.

The liquid crystal display of the present invention for achieving the above object is composed of a plurality of pixels, the liquid crystal display for time-divisionally displaying the left eye image and right eye image in each sub-frame by dividing one frame into at least two sub-frames panel; A driver for selecting the plurality of pixels and time-divisionally applying the left eye image data and the right eye image data to the selected pixels; A backlight for irradiating predetermined light on the liquid crystal display panel; A light source controller for controlling light emission of the backlight; An electro-optic prism attached to an image display surface of the liquid crystal display panel and spatially dividing the left eye image or the right eye image; A synchronizer for synchronizing a time division timing of the liquid crystal display panel with an on / off operation of the electro-optic prism; A waveform generator for receiving a synchronization signal from the synchronizer and applying a predetermined voltage to the electro-optic prism for refracting either the left eye image data or the right eye image data; A focusing lens for focusing the left or right eye image transmitted through the electro-optic prism to the left or right eye of the viewer; And a timing controller for controlling operations of the backlight unit, the driver, and the synchronizer.

In addition, the driving method of the liquid crystal display device of the present invention includes a liquid crystal display panel for displaying a three-dimensional image, a backlight for applying a predetermined light to the liquid crystal display panel and an electro-optic prism for refracting the three-dimensional image. In the driving method of,

Dividing one frame into three subframes and time-divisionally applying left eye image data and right eye image data to a liquid crystal display panel in a first sub frame; A second step in which the backlight emits predetermined light in the first subframe; Applying a predetermined voltage to the electro-optic prism to refract the left eye image data or the right eye image data output from the liquid crystal display panel in the first subframe; And a fourth step of repeating the first to third steps in the second and third subframes.

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

1 is a block diagram illustrating a stereoscopic image liquid crystal display device of a field sequential driving method according to an embodiment of the present invention.

Referring to FIG. 1, a stereoscopic image liquid crystal display device having a field sequential driving method according to an exemplary embodiment of the present invention includes a liquid crystal display panel 10, a driver 20, a backlight 30, a light source controller 40, a timing controller ( 50), an electro-optic prism 60, a synchronizer 70, a waveform generator 80, and a focusing lens 90.

The liquid crystal display panel 10 receives time-divided left eye image data Dl and right eye image data Dr, which are stereoscopic images, and displays the same on the corresponding pixels.

The driving unit 20 may scan data (not shown) and data of the liquid crystal display panel 10 such that the left eye image data Dl and the right eye image data Dr are displayed in a time-divided state through the liquid crystal display panel 10. A scan driver (not shown) for applying a scan signal to a line (not shown) and a source driver (not shown) for sequentially applying time-segmented left / right eye image data (Dl and Dr). In addition, in the field sequential driving method, since the previous frame or the previous data affects the current frame or the current data, data is not applied to the reset section for resetting the liquid crystal at the beginning of each image data. Reset means that the light transmittance of the liquid crystal is substantially 0 (black state) or 100 (white state).

The backlight 30 is composed of at least one light emitting diode (LED), for example, a red light emitting diode (RLED), a green light emitting diode (GLED), and a blue light emitting diode (BLED), and includes at least two subframes during one frame. Light is sequentially or simultaneously emitted in synchronization with time-divisional left eye image data D1 and right eye image data Dr applied to the liquid crystal display panel 10 in the divided subframe. In the embodiment of the present invention, the backlight 30 is composed of only R, G, and B light emitting diodes (RLED, GLED, BLED), but R, G, B light emitting diodes and W light emitting diodes emitting W (white) colors (WLEDs). It may be composed of).

The light source controller 40 controls the red light emitting diode (RLED), the green light emitting diode (GLED), and the blue light emitting diode (BLED) constituting the backlight 30 to sequentially emit light in the corresponding subframe.

In the exemplary embodiment of the present invention, since a field sequential driving method is used, one frame is divided into at least two subframes, for example, a red subframe, a green subframe, and a blue subframe, and a left eye / right eye image is included in one subframe. Data D1 and Dr are time-divided and applied to the liquid crystal display panel 10. That is, in one frame, left / right eye image data (Dl, Dr) and R, G, and B light are sequentially applied to one pixel. (In FIG. 1, light is emitted in the order of DlB → DrB → DlG → DrG → DlR → DrR. Therefore, it may have a resolution three times higher than that of a conventional Korean patent disclosed display. The operation timing diagram of FIG. 3 to be described later will be described in detail.

The timing controller 50 applies a control signal so that the driving unit 20, the light source controller 40, and the synchronizer 70 to be described later operate in synchronization with each other in each subframe.

An electro-optic prism 60 is attached to the image display surface of the liquid crystal display panel 10 to refract the left or right eye image. The electro-optic prism 60 will be described with reference to FIG. 2.

2 is a perspective view illustrating an electro-optic prism of the stereoscopic image liquid crystal display device of the field sequential driving method according to the embodiment of the present invention.

Referring to FIG. 2, the electro-optic prism 60 includes an upper plate 61 of a transparent material having a toothed portion formed on an inner surface thereof, a lower plate 63 disposed opposite to the upper plate 61, and an upper plate 61 and a lower plate 63. And an electro-optic material 65 injected into the space between the electrodes, and a transparent conductive film 67 formed on the outer surfaces of the upper plate 61 and the lower plate 63 to apply a voltage to the electro-optic material 65.

The electro-optic prism 60 is designed in consideration of the amount of change in the refractive flow of the electro-optic material 65, the inclination angle θ of the teeth, and the viewing distance. Typically, the viewing distance is set equal to the focal length of the focusing lens 90 installed in front of the electro-optic prism 60. When the viewing distance is 1m, the left eye image data Dl and the right eye image data Dr are Since it should be about 63mm (average distance between both eyes), the amount of change in refractive index and the inclination (θ) of the teeth should be set in consideration of the viewing distance. That is, the closer the viewing distance is, the larger the angle of deflection by the electro-optic prism 60 is. As the distance increases, an electro-optic material having a small change in refractive index may be used, or the tooth slope θ may be set smaller. In this case, as the electro-optic material 65, a nematic liquid crystal, NH ₄ H ₂ PO ₄ , LiNbO _3, or the like may be used. It is preferable to use a nematic liquid crystal having a large change in refractive index when voltage is applied. The thickness of the electro-optic material 65 is suitably several to several tens of micrometers.

Referring back to FIG. 1, a syncronizer 70 receives a control signal from the timing controller 50 to time-division timing of left / right eye image data D1 and Dr of the liquid crystal display panel 10. The on / off operation of the electro-optic prism 60 is synchronized.

The waveform generator 80 receives the synchronization signal S from the synchronizer 70 and refracts only one of the left eye and right eye image data D1 and Dr so that the left or right eye image is spatially divided. The electrical signal S 'is output to the electro-optic prism 60.

The focusing lens 90 focuses an image transmitted through the electro-optic prism 60 to the left or right eye of the viewer.

The stereoscopic image liquid crystal display of the field sequential driving method of the present invention having the above-described configuration time-divisions the left and right eye images, spatially divides the left and right eye images in the electro-optic prism, and R, in the light source controller and the backlight unit. By time-dividing G and B light to display a stereoscopic image, the resolution is improved three times as compared to the technique of the aforementioned Korean Patent Publication, which time-divided and displays the conventional left and right eyes.

3 is a timing diagram illustrating a method of driving a stereoscopic image liquid crystal display device having a field sequential driving method according to an embodiment of the present invention, FIG. 4 is a diagram illustrating a path through which right eye image data is delivered to a viewer, and FIG. 5 is a left eye. A diagram illustrating a path through which image data is delivered to a viewer.

In an embodiment of the present invention, one frame includes three subframes, that is, a first subframe (red) for driving the R backlight, a second subframe (green) for driving the G backlight, and a second subframe for driving the B backlight. It is assumed that it consists of three sub-frames (blue) and emits light sequentially for one frame in the order of R, G, and B backlights. In addition, it is assumed that each image data is applied from the right eye image data Dr and the left eye image data Dl is applied in each subframe.

3, 4, and 5, three red, green, and blue subframes are divided to display a stereoscopic image on one pixel during one frame, and each subframe is inputted by the right eye image data Dr. It is divided into a section to be input and a section into which the left eye image data D _l is input. In addition, there is a reset period re for resetting the liquid crystal at the initial stage when the left eye or right eye image data D1 and Dr are applied. In the reset period re, the liquid crystal is not applied without the image data. Reset it.

First, red (R), green (G), and blue (B) light emission constituting the backlight 30 according to a control signal of the light source controller 40 during the right eye image data section of the first subframe (red). Among the diodes, R LEDs emit light. At the same time, when the right eye image data Dr is applied to the liquid crystal display panel 10 in the eastern part 20, the red light R has a transmittance corresponding to the right eye image data Dr. Is displayed through). As described above, the right eye red image data Dr / R is transmitted through the electro-optic prism 60. At this time, the synchronizer 70 synchronizes the right eye image data Dr signal from the timing controller 50. The signal S is output to the waveform generator 80. However, since no voltage waveform is generated in the waveform generator 80, the voltage is not applied to the electro-optic material 65 inside the electro-optic prism 60. Accordingly, the electro-optic prism 60 functions as one medium having the refractive index n1 of the upper and lower plates, and the right eye red image data Dr / R is used to adjust the refractive index n1 and the tooth inclination θ. The light is refracted by the calculated angle φ of the light and then focused by the focusing lens 90 to be incident into the viewer's right eye.

In addition, during the left eye image data section of the first subframe (red), red (R), green (G), and blue (B) light emission constituting the backlight 30 according to the control signal of the light source controller 40. Among the diodes, R LEDs emit light. At the same time, when the driver 20 applies the left eye image data D _l to the liquid crystal display panel 10, the red light R has a transmittance corresponding to the left eye image data Dr. Is displayed through). As described above, the left eye red image data D _| / R is transmitted through the electro-optic prism 60. At this time, the synchronizer 70 synchronizes with the left eye image data D _| signal from the timing controller 50. The synchronized signal S is output to the waveform generator 80. The waveform generator 80 applies a voltage of a predetermined potential to the electro-optic material 65 through the conductive film 67. Accordingly, the refractive index n2 of the electro-optic material 65 is changed by a predetermined amount according to the magnitude of the applied voltage. The left-eye red image data D incident on the electro-optic prism 60 is thus determined. _l / R is more refracted than the right eye red image data Dr / R according to the change of the refractive index of the electro-optic material 65 and is incident on the focusing lens 90, and then is incident on the left eye of the viewer.

Next, during the right eye image data section of the second subframe (green), red (R), green (G), and blue (B) constituting the backlight 30 according to the control signal of the light source controller 40. Among the light emitting diodes, G light emitting diodes (GLEDs) emit light. At the same time, when the driver 20 applies the right eye image data Dr to the liquid crystal display panel 10, the green light G has a transmittance corresponding to the right eye image data Dr. Is displayed through. As described above, the right eye green image data Dr / G is transmitted through the electro-optic prism 60. At this time, the synchronizer 70 synchronizes with the right eye image data Dr signal from the timing controller 50. The signal S is output to the waveform generator 80. However, since no voltage waveform is generated in the waveform generator 80, the voltage is not applied to the electro-optic material 65 inside the electro-optic prism 60. Accordingly, the electro-optic prism 60 functions as one medium having the refractive index n1 of the upper and lower plates, and the right eye green image data Dr / G is used to adjust the refractive index n1 and the tooth inclination θ. The light is refracted by the calculated angle φ of the light and then focused by the focusing lens 90 to be incident into the viewer's right eye.

In addition, during the left eye image data section of the second sub-frame (green), red (R), green (G), and blue (B) light emission constituting the backlight 30 according to the control signal of the light source controller 40. The G light emitting diode (RLED) of the diode emits light. At the same time, when the driver 20 applies the left eye image data D _l to the liquid crystal display panel 10, the green light G has a transmittance corresponding to the left eye image data Dr. Is displayed through). As described above, the left eye image data D _| / G is transmitted through the electro-optic prism 60. At this time, the synchronizer 70 synchronizes with the left eye image data D _| signal from the timing controller 50. The synchronized signal S is output to the waveform generator 80. The waveform generator 80 applies a voltage of a predetermined potential to the electro-optic material 65 through the conductive film 67. Therefore, the refractive index n2 of the electro-optic material 65 is changed by a predetermined amount according to the magnitude of the applied voltage, so that the left eye green image data D incident on the electro-optic prism 60 is included. _l / G) in accordance with the change in refractive index of the electro-optical material 65 is further refracted right eye than the green image data (Dr / G) it is to be joined after being incident on the focusing lens 90, a viewer's left eye.

Lastly, during the right eye image data section of the third subframe (blue), red (R), green (G), and blue (B) constituting the backlight 30 according to the control signal of the light source controller 40. Among the light emitting diodes, B light emitting diodes (BLEDs) emit light. At the same time, when the driver 20 applies the right eye image data Dr to the liquid crystal display panel 10, the blue light B has a transmittance corresponding to the right eye image data Dr. Is displayed through. As described above, the right eye blue image data Dr / B is transmitted through the electro-optic prism 60. At this time, the synchronizer 70 synchronizes the right eye image data Dr signal from the timing controller 50. The signal S is output to the waveform generator 80. However, since no voltage waveform is generated in the waveform generator 80, the voltage is not applied to the electro-optic material 65 inside the electro-optic prism 60. Accordingly, the electro-optic prism 60 acts as one medium having the refractive index n1 of the upper and lower plates, and the right eye blue image data Dr / R is used to adjust the refractive index n1 and the tooth inclination θ. The light is refracted by the calculated angle φ of the light and then focused by the focusing lens 90 to be incident into the viewer's right eye.

In addition, during the left eye image data section of the third subframe (blue), red (R), green (G), and blue (B) light emission constituting the backlight 30 according to the control signal of the light source controller 40. B light emitting diode (BLED) of the diode emits light. At the same time, when the driver 20 applies the left eye image data D _l to the liquid crystal display panel 10, the blue light B has a transmittance corresponding to the left eye image data Dr. Is displayed through). As described above, the left eye blue image data D _| / B is transmitted through the electro-optic prism 60. At this time, the synchronizer 70 synchronizes with the left eye image data D _| signal from the timing controller 50. The synchronized signal S is output to the waveform generator 80. The waveform generator 80 applies a voltage of a predetermined potential to the electro-optic material 65 through the conductive film 67. Therefore, the refractive index n2 of the electro-optic material 65 is changed by a certain amount according to the magnitude of the applied voltage, and thus the left eye blue image data D incident on the electro-optic prism 60 is included. _l / B is further refracted than the right eye blue image data Dr / B according to the change of the refractive index of the electro-optic material 65 to enter the focusing lens 90, and then to the left eye of the viewer.

As described above, all pixels of the liquid crystal display panel display stereoscopic images having transmittances corresponding to left / right eye time-division image data according to R, G, and B time-division light.

In the present invention, one frame is divided into three subframes, and the R, G, and B LEDs are sequentially driven for each subframe, but the present invention is not limited thereto. In the present invention, one frame is divided into at least two subframes. The point is that it can be. For example, one frame is divided into four or more subframes, and three subframes sequentially drive R, G, and B light emitting diodes, and the other frame drives all of the R, G, and B light emitting diodes, or R, G One or more of the B light emitting diodes may be driven.

Meanwhile, the backlight may be configured of R, G, B, and W light emitting diodes, driving R, G, and B light emitting diodes in three of the four subframes, and configuring a W light emitting diode in the other frame. .

In addition, although the above-described subframes emit light in the order of R, G, and B, the embodiment is illustrated, but is not limited thereto.

Further, although the embodiment has shown that the voltage of the waveform generator is applied to the electro-optic prism when the left eye image data is applied, the voltage may be applied when the right eye image data is applied.

As described above, the field-sequencial stereoscopic liquid crystal display device according to an exemplary embodiment of the present invention has R, G, and B backlights on one pixel that is not divided into R, G, and B pixel units. Is a structure in which R, G, B three primary colors of light are sequentially time-divided sequentially through the liquid crystal from the R, G, and B backlights on one pixel, and the left and right eye image data are time-divisionally divided by the driver. In the electro-optic prism, the left and right eye image data are spatially divided to display a color image using an afterimage effect of an eye. Accordingly, a three-dimensional liquid crystal display device having a field-sequencial driving method has a resolution that is three times higher than that of a stereoscopic image display device obtained by time-dividing conventional left eye and right eye image data.

In the above description, a device in which left and right eye images are displayed on a liquid crystal display panel has been described as an embodiment, but instead of the liquid crystal display panel, a plasma display panel (PDP) organic electroluminescent display (CEL) and a cathode ray tube (CRT) are used. It is also possible to use other display elements.

As described above, the stereoscopic image liquid crystal display of the field sequential driving method of the present invention time-divisions the left / right eye image, and sequentially emits R, G, and B light to one pixel not divided into R, G, and B pixel units. Since displaying a three-dimensional image, there is an effect that can maintain more than three times the resolution than the conventional three-dimensional display.

While the invention has been described above with reference to preferred embodiments, those skilled in the art will be able to variously modify and change the invention without departing from the spirit and scope of the invention as set forth in the claims below. I can understand that you can.

Claims (14)

A liquid crystal display panel composed of a plurality of pixels, for dividing one frame into at least two subframes to time-divisionally display a left eye image and a right eye image in each subframe; A driver for selecting the plurality of pixels and time-divisionally applying the left eye image data and the right eye image data to the selected pixels; A backlight for irradiating predetermined light on the liquid crystal display panel; A light source controller for controlling light emission of the backlight; An electro-optic prism attached to an image display surface of the liquid crystal display panel and spatially dividing the left eye image or the right eye image; A synchronizer for synchronizing a time division timing of the liquid crystal display panel with an on / off operation of the electro-optic prism; A waveform generator for receiving a synchronization signal from the synchronizer and applying a predetermined voltage to the electro-optic prism for refracting either the left eye image data or the right eye image data; A focusing lens for focusing the left or right eye image transmitted through the electro-optic prism to the left or right eye of the viewer; And And a timing controller for controlling the operation of the backlight unit, the driver, and the synchronizer. The method of claim 1, And said backlight comprises a red light emitting diode (RLED), a green light emitting diode (GLED), and a blue light emitting diode (BLED). The method of claim 2, And the one frame is divided into three subframes, and any one of the RLED, the GLED, and the BLED emits light in each subframe. The method of claim 1, The backlight includes a red light emitting diode (RLED), a green light emitting diode (GLED), a blue light emitting diode (BLED), and a white light emitting diode (WLED). The method of claim 4, wherein The one frame is divided into four subframes, and any one of the RLEDs, GLEDs, and BLEDs emits light in any three subframes, and all of the RLEDs, GLEDs, and BLEDs emit light or WLEDs in the other one subframe. The light source emits light in a field sequential liquid crystal display device. The method of claim 1, The electro-optic prism, An upper plate made of a transparent material having teeth on an inner surface thereof; A lower plate disposed to face the upper plate; An electro-optic material injected into a space between the upper and lower plates, the refractive index of which is changed according to an applied voltage; And And a transparent conductive film attached to the upper and lower plates to apply a voltage to the electro-optic material. The method of claim 6, The electro-optic material is any one of a nematic liquid crystal, NH ₄ H ₂ PO ₄ , LiNbO ₃ material, characterized in that the field-sequential liquid crystal display device. The method of claim 1, And wherein each of the subframes has a reset period for initializing the liquid crystal at the initial time of applying the left eye image data and the right eye image data. The method of claim 8, And wherein the light transmittance of the liquid crystal is substantially 0 or 100 in the reset section. A method of driving a field-sequential liquid crystal display device comprising a liquid crystal display panel displaying a stereoscopic image, a backlight for applying a predetermined light to the liquid crystal display panel, and an electro-optic prism for refracting the stereoscopic image. Divide one frame into three subframes, A first step of time-divisionally applying left eye image data and right eye image data to a liquid crystal display panel in a first subframe; A second step in which the backlight emits predetermined light in the first subframe; Applying a predetermined voltage to the electro-optic prism to refract the left eye image data or the right eye image data output from the liquid crystal display panel in the first subframe; And And a fourth step of repeating the first to third steps in the second and third subframes. The method of claim 10, And the backlight comprises a red light emitting diode (RLED), a green light emitting diode (GLED), and a blue light emitting diode (BLED). The method of claim 11, And any one of the RLED, the GLED, and the BLED emits light in each of the sub-frames. The method of claim 10, And wherein each of the subframes has a reset period for initializing the liquid crystal upon initial application of the left eye image data and the right eye image data. The method of claim 13, And wherein the light transmittance of the liquid crystal is substantially 0 or 100 in the reset section.

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