KR101679074B1 - Stereoscopic image display device - Google Patents

Abstract

The present invention relates to a stereoscopic image display device. In the stereoscopic image display apparatus of the present invention, the left eye image is displayed during the (N + 1) th (N is a positive integer including 0) and the (N + And a liquid crystal shutter glasses including an electronically controlled left eye shutter and a right eye shutter, wherein the liquid crystal shutter glasses are arranged in the (N + 2) Only the left-eye shutter is opened after the response delay time elapses, and only the right-eye shutter is opened after the liquid crystal response delay time of the display panel has elapsed in the (N + 4) -th frame period.
The present invention provides a stereoscopic image display device capable of reducing a response time of a liquid crystal of a display panel in a three-dimensional image and improving 3D crosstalk.

Description

[0001] STEREOSCOPIC IMAGE DISPLAY DEVICE [0002]

The present invention relates to a stereoscopic image display device.

The stereoscopic display is divided into a stereoscopic technique and an autostereoscopic technique.

The binocular parallax method uses parallax images of right and left eyes with large stereoscopic effect, and both glasses and non-glasses are used, and both methods are practically used. The glasses system displays polarized light of right and left parallax images on a direct-view type display device or a projector in a time-division manner. The glasses system implements a stereoscopic image using polarized glasses or liquid crystal shutter glasses. In the non-eyeglass system, an optical plate such as a parallax barrier or a lenticular lens is generally used to separate the optical axes of the left and right parallax images to realize a stereoscopic image.

As a light source of a backlight unit applied to a stereoscopic image display apparatus, a light emitting diode (hereinafter referred to as "LED") having a faster response speed than a fluorescent lamp is advantageous. When the duty ratio of the LED is increased in the stereoscopic image display apparatus, a 3D crosstalk appears in which the left eye image and the right eye image overlap each other. To solve this problem, it is possible to flicker with a low PWM duty ratio (Pulse Width Modulation Duty Ratio).

1 is a waveform diagram showing a backlight unit control signal C _BLU . The PWM duty ratio DR defines the lighting time ratio of the LED per unit time. The PWM duty ratio DR is expressed by Equation (1).

In Equation 1, DR denotes a PWM duty ratio, d ₁ denotes a high logic level (backlight unit ON time) of the PWM signal, and d ₂ denotes a low logic level (backlight unit OFF time) of the PWM signal. However, when the PWM duty ratio DR is low, the liquid crystal temperature of the display panel is lowered, so that the response speed of the liquid crystal is slowed down. When the response speed of the liquid crystal is slowed, a 3D crosstalk occurs in which the left eye image and the right eye image overlap each other.

The present invention provides a stereoscopic image display device capable of reducing a response time of a liquid crystal of a display panel in a three-dimensional image and improving 3D crosstalk.

In the stereoscopic image display apparatus of the present invention, the left eye image is displayed during the (N + 1) th (N is a positive integer including 0) and the (N + And a liquid crystal shutter glasses including an electronically controlled left eye shutter and a right eye shutter, wherein the liquid crystal shutter glasses are arranged in the (N + 2) Only the left-eye shutter is opened after the response delay time elapses, and only the right-eye shutter is opened after the liquid crystal response delay time of the display panel has elapsed in the (N + 4) -th frame period.

delete

The present invention can improve the 3D crosstalk by controlling the on / off timing of the liquid crystal shutter glasses in consideration of the liquid crystal response delay time of the display panel.

Further, the present invention increases the duty ratio of the backlight in the three-dimensional image. As a result, the present invention can improve the brightness of the display panel, prevent the temperature of the liquid crystal of the display panel from lowering, and increase the response speed of the liquid crystal.

Furthermore, the present invention divides the backlight unit into blocks and sequentially drives the blocks. Further, the present invention controls the lighting timing of the backlight unit and the on / off timing of the liquid crystal shutter glasses in consideration of the liquid crystal response delay time of the display panel and the liquid crystal shutter glasses. As a result, the present invention can improve the uniformity of image quality.

1 is a waveform diagram showing a backlight unit control signal.
2 is a block diagram illustrating a stereoscopic image display apparatus according to an exemplary embodiment of the present invention.
3 is a view showing the driving of the display panel and the liquid crystal shutter glasses of the present invention.
4A is a graph showing a normal gamma characteristic curve.
4B is a graph showing a high gamma characteristic curve.
4C is a graph showing the curve of the low gamma characteristic curve.
5 is a flowchart illustrating a driving method of a stereoscopic image display apparatus according to a first embodiment of the present invention.
6 is a waveform diagram showing driving waveforms of the stereoscopic image display apparatus according to the first embodiment of the present invention.
7 is a waveform diagram showing a driving waveform of a liquid crystal shutter glasses control signal in consideration of liquid crystal characteristics of a display panel in the first embodiment of the present invention.
FIG. 8 is a waveform diagram showing details of driving waveforms of the backlight unit control signal and the left eye liquid crystal shutter glasses control signal during T ₂ and T ₃ shown in FIG. 7.
9A and 9B are flowcharts illustrating a method of driving a stereoscopic image display apparatus according to a second embodiment of the present invention.
10 is a waveform diagram showing driving waveforms of the stereoscopic image display apparatus according to the second embodiment of the present invention.
11 is a view showing a display panel according to a second embodiment of the present invention.
12 is a waveform diagram showing a driving waveform of a liquid crystal shutter glasses control signal in consideration of liquid crystal characteristics of a display panel in a second embodiment of the present invention.
13 is a flowchart illustrating a method of driving a stereoscopic image display apparatus according to a third embodiment of the present invention.
14 is a waveform diagram showing driving waveforms of a stereoscopic image display apparatus according to a third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The component name used in the following description may be selected in consideration of easiness of specification, and may be different from the actual product name.

2 is a block diagram illustrating a stereoscopic image display apparatus according to an exemplary embodiment of the present invention. 2, a stereoscopic image display apparatus according to an exemplary embodiment of the present invention includes a display panel 10, a backlight unit 20, a liquid crystal shutter glasses 30, a display panel driver 110, a backlight unit driver 120, A liquid crystal shutter shutter glasses control signal receiving unit 130, a liquid crystal shutter glasses control signal transmitting unit 140, and a controller 200. [

The display panel 10 alternately displays the left eye image data RGB _L and the right eye image data RGB _R under the control of the controller 200. The display panel 10 may display two-dimensional image data (RGB) having no distinction between the left eye image and the right eye image under the control of the controller 200. [ The display panel 10 may be selected as a hold-type display element requiring the backlight unit 20. [ The hold-type display device is typically a transmissive liquid crystal display panel that modulates light from the backlight unit 20.

The transmissive liquid crystal display panel includes a thin film transistor (hereinafter referred to as "TFT") substrate and a color filter substrate. A liquid crystal layer is formed between the TFT substrate and the color filter substrate. On the TFT substrate, data lines and gate lines (or scan lines) are formed to intersect each other on a lower glass substrate, and liquid crystal cells are arranged in a matrix form in cell regions defined by data lines and gate lines do. The TFT formed at the intersection of the data lines and the gate lines transmits a data voltage supplied to the pixel electrode of the liquid crystal cell via the data lines in response to a scan pulse from the gate line. To this end, the gate electrode of the TFT is connected to the gate line, and the source electrode is connected to the data line. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell. A common voltage is supplied to the common electrode facing the pixel electrode. The color filter substrate includes a black matrix and a color filter formed on the upper glass substrate. The common electrode is formed on the upper glass substrate in a vertical electric field driving method such as a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode, and a horizontal electric field such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) Is formed on the lower glass substrate together with the pixel electrode in the driving method. In each of the upper glass substrate and the lower glass substrate of the transmissive liquid crystal display panel, a polarizing plate is attached and an alignment film for setting a pre-tilt angle of the liquid crystal is formed. A spacer for maintaining a cell gap of the liquid crystal layer is formed between the upper glass substrate and the lower glass substrate of the transmissive liquid crystal display panel. The liquid crystal mode of the transmissive liquid crystal display panel can be implemented not only in the TN mode, the VA mode, the IPS mode, and the FFS mode, but also in any liquid crystal mode.

The display panel driving unit 110 includes a data driving circuit and a gate driving circuit. The data driving circuit converts the data (RGB _L , RGB _R ) of the left eye image and the right eye image inputted from the controller 200 in the three-dimensional image into a positive / negative gamma compensation voltage to generate a positive / negative analog data voltage Lt; / RTI > The positive / negative polarity analog data voltages output from the data driving circuit are supplied to the data lines of the display panel 10. The gate driving circuit sequentially supplies gate pulses (or scan pulses) synchronized with the data voltage to the gate lines of the display panel 10. [

The backlight unit 20 illuminates the display panel 10 for a predetermined period of time, and extinguishes the light for another period. The backlight unit 20 includes a light source, a light guide plate (or diffusion plate), and a plurality of optical sheets, which are turned on in accordance with the driving power supplied from the backlight unit driving unit 120. The backlight unit 20 may be implemented as a direct type backlight unit or an edge type backlight unit. The light sources of the backlight unit 20 according to the first and second embodiments include LEDs. The light sources of the backlight unit 20 according to the third embodiment include a fluorescent lamp.

The backlight unit driving unit 120 generates driving power for lighting the light source. In the first and second embodiments, the backlight unit driving unit 120 periodically turns on / off the driving power supplied to the light source under the control of the controller 200. In the third embodiment, the backlight unit driving unit 120 continuously turns on the driving power supplied to the light source under the control of the controller 200. [

The liquid crystal shutter glasses 30 are provided with an electrically controlled left eye shutter ST _L and a right eye shutter ST _R. Each of the left eye shutter ST _L and the right eye shutter ST _R includes a first transparent substrate, a first transparent electrode formed on the first transparent substrate, a second transparent substrate, a second transparent electrode formed on the second transparent substrate, And a liquid crystal layer sandwiched between the first and second transparent substrates. A reference voltage is supplied to the first transparent electrode and an ON / OFF voltage is supplied to the second transparent electrode. Each of the left eye shutter ST _L and the right eye shutter ST _R transmits the light from the display panel 10 when the ON voltage is supplied to the second transparent electrode while when the OFF voltage is supplied to the second transparent electrode And blocks light from the display panel 10.

The liquid crystal shutter glasses control signal transmission unit 140 transmits the left eye and right eye liquid crystal shutter eyeglass control signals C _LST and C _RST which are connected to the controller 200 and input from the controller 200 through the liquid crystal shutter glasses control And transmits it to the signal receiving unit 130. The liquid crystal shutter glasses control signal receiving unit 130 is installed in the liquid crystal shutter glasses 30 and receives the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST through a wired / wireless interface. The left eye and right eye liquid crystal shutter glasses a left-eye shutter _(L ST) and the right-eye shutter _(R ST) of the liquid crystal shutter glasses 30 according to a control signal _(LST C, C _RST) to open and close.

The ON voltage is supplied to the second transparent electrode of the left eye shutter ST _L when the left eye liquid crystal shutter eyeglass control signal C _LST is input to the liquid crystal shutter eyeglass control signal receiving unit 130 with the first logical value. OFF voltage is supplied to the second transparent electrode of the left eye shutter ST _L when the left eye liquid crystal shutter eyeglass control signal C _LST is input to the liquid crystal shutter eyeglass control signal receiving unit 130 with the second logic value.

The ON voltage is supplied to the second transparent electrode of the right eye shutter ST _R when the right eye liquid crystal shutter glasses control signal C _RST is input to the liquid crystal shutter eyeglass control signal receiving unit 130 with the first logic value. OFF voltage is supplied to the second transparent electrode of the right eye shutter ST _R when the right eye liquid crystal shutter eyeglass control signal C _RST is input to the liquid crystal shutter eyeglass control signal receiving unit 130 at the second logic value.

The first logic value may be set to a high logic voltage, and the second logic value may be set to a low logic voltage.

The controller 200 receives timing signals and digital video data (RGB) from a video source (not shown). The timing signals include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, a dot clock CLK, and the like.

The controller 200 multiplies the frame frequency by L times, preferably four times or more times the input frame frequency, and outputs the display panel control signal C _DIS , the backlight unit control signal C _BLU , Thereby generating the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST . The input frame frequency is 50 Hz in the PAL (Phase Alternate Line) method and 60 Hz in the National Television Standards Committee (NTSC) method. Therefore, when the input frame frequency is multiplied by quadruple, the controller 200 generates the display panel control signal C _DIS , the backlight unit control signal C _BLU , and the left eye and right eye liquid crystal shutter glasses control signal (C _LST , C _RST ). One frame period is 5 msec when the frame frequency is 200 Hz and one frame period is about 4.16 msec when the frame frequency is 240 Hz.

The display panel control signal C _DIS includes a data control signal for controlling the operation timing of the data driving circuit and a gate control signal for controlling the operation timing of the gate driving circuit. The data control signal includes a source start pulse (SSP), a source sampling clock (SSC), a source output enable (SOE) signal, a polarity control signal (POL) The source start pulse SSP controls the data sampling start timing of the data driving circuit. The source sampling clock is a clock signal that controls the sampling operation of the data driving circuit based on the rising or falling edge. The source start pulse SSP and the source sampling clock SSC may be omitted if the digital video data to be input to the data driving circuit is transmitted in the mini LVDS (Low Voltage Differential Signaling) interface standard. The polarity control signal POL inverts the polarity of the data voltage output from the data driving circuit to n (n is a positive integer) horizontal period period. The source output enable signal SOE controls the output timing of the data driving circuit.

The gate control signal includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), and the like. The gate start pulse (GSP) controls the timing of the first gate pulse. The gate shift clock GSC is a clock signal for shifting the gate start pulse GSP. The gate output enable signal GOE controls the output timing of the gate drive circuit.

The backlight unit control signal C _BLU controls the backlight unit driving unit 120 so that the light source of the backlight unit 20 is periodically turned on and off as shown in FIG. 6 and FIG. The backlight unit control signal C _BLU may control the backlight unit driving unit 120 to continuously light the backlight unit 20 as shown in FIG. The left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST are transmitted to the liquid crystal shutter eyeglasses control signal transmission unit 140 to shift the left eye shutter ST _L and the right eye shutter ST _{R of the} liquid crystal shutter glasses 30 Respectively.

The controller 200 may include a frame counter, a line counter, a memory, and the like. The frame counter counts a signal in which a pulse is generated once in one frame period (one vertical period), such as a vertical synchronizing signal (Vsync) or a gate start pulse (GSP), and generates a frame count signal. The line counter counts a signal in which a pulse is generated once in one horizontal period, such as a horizontal synchronizing signal (Hsync) or a data enable signal (DE), and generates a line count signal.

The controller 200 can determine the frame period, the lighting period of the backlight unit, and the operating period of the liquid crystal shutter glasses through the frame counter and the line counter. Therefore, the controller 200 receives the frame count signal and the line count signal, and generates the backlight unit control signal C _BLU and the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST .

The memory temporarily stores input digital video data (RGB). The left eye image data RGB _L and the right eye image data RGB _R are alternately encoded in units of one frame to the input digital video data RGB. The controller 200 rearranges the digital video data RGB input from the memory to separate the left eye image data RGB _L and the right eye image data RGB _R. [ Then, the controller 200 (N + 1) and the N + 2 frame period the same left-eye image data and an (RGB _L) sent continuously, the N + 3 and the N + 4 the same right-eye image data for a frame period for ( RGB _R ) in succession.

The controller 200 may also convert the gamma characteristics of the left eye image data RGB _L differently in units of one frame period and differently convert the gamma characteristics of successive right eye image data RGB _{R in} units of one frame period . A description thereof will be given later with reference to Figs. 4A to 4C.

3 is a view showing driving of the display panel 10 and the liquid crystal shutter glasses 30 of the present invention. 3, the (N + 1) and the N + 2 when the displayed left-eye image data (RGB _L) during a frame, and the left eye shutters (ST _L) of the liquid crystal shutter glasses 30 is opened and the right eye shutter (ST _R ) is cut off. The N + 3 and the N + 4 when the displayed right-eye image data (RGB _L) during a frame, the right eye shutter (ST _R) of the liquid crystal shutter glasses 30 is opened, and blocks the left eye shutters (ST _L).

The display panel 10 continuously displays the left eye image data RGB _L during N + 1 (N is a positive integer including 0) and the (N + 2) -th frame period. (N + 1) and the N + 2 frame period, each of the left-eye image data to be displayed for (RGB _L) is the same data, has the same gamma characteristic of the gamma characteristic curve n.

The display panel 10 successively displays the right eye image data RGB _R during the (N + 3) th and (N + 4) th frame periods. Each right eye image data RGB _R displayed during the (N + 3) th and (N + 4) th frame periods is the same data, and has the same gamma characteristic as the normal gamma characteristic.

And the left eye image data RGB _L displayed during the (N + 1) th and (N + 2) -th frame periods may have different gamma characteristics. The right eye image data RGB _R displayed during the (N + 3) th and (N + 4) th frame periods may have different gamma characteristics.

4A to 4C are graphs showing a normal gamma characteristic curve, a high gamma characteristic curve, and a low gamma characteristic curve. The display panel 10 displays the left eye image data RGB _{L (HG)} modulated with the high gamma characteristic as shown in FIG. 4B during the (N + 1) Eye image data (RGB _{L ( LG )} ) modulated by the characteristic can be displayed. The display panel 10 displays the right eye image data RGB _{R (HG)} modulated with the high gamma characteristic during the (N + 3) frame period and the right eye image data RGB _{R ( LG )} ) can be displayed.

The left and right eye image data (RGB _{L ( HG )} , RGB _{R ( HG )} ) modulated by the high gamma characteristic increase the display luminance in low gradation and middle gradation compared with the normal gamma characteristic. Left and right eye image data (RGB _{L ( LG )} and RGB _{R ( LG )} ) modulated by the low gamma characteristic lower the display luminance in the low gray level and the middle gray level compared with the normal gamma characteristic.

5 is a flowchart illustrating a driving method of a stereoscopic image display apparatus according to a first embodiment of the present invention. 6 is a waveform diagram showing driving waveforms of the stereoscopic image display apparatus according to the first embodiment of the present invention. The stereoscopic image display apparatus shown in FIG. 2 will be described in detail with reference to this embodiment. In Figures 5 and 6, the light sources of the backlight unit include LEDs.

5 and 6, in the two-dimensional image, the controller 200 addresses the two-dimensional image data (RGB) to the display panel 10. The controller 200 generates the backlight unit control signal C _BLU with high logic so that the backlight unit driver 120 turns on the light sources of the backlight unit 20 in response to the backlight unit control signal C _BLU of high logic . (S101, S151)

In the three-dimensional image, the controller 200 generates the display panel control signal C _DIS during the (N + 1) -th frame period. Controller 200 generates a left-eye image data for (N + 1) frame period (RGB _L) supplied to the data driver, and the backlight unit control signal (C _BLU) to a high logic. In addition, the controller 200 generates the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST as low logic during the (N + 1) -th frame period.

The data drive circuitry is addressing the left-eye image data (RGB _L) to the pixels of the left-eye image data and the voltage data of (RGB _L) supplied to the data lines of the display panel is a display panel for a (N + 1) frame period. The backlight unit driving unit 120 turns on the light sources of the backlight unit 20 during the (N + 1) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S102, S103)

The controller 200 generates the display panel control signal C _DIS during the (N + 2) -th frame period and supplies the left eye image data RGB _L to the data driving circuit. Controller 200 generates a low logic to the left and right eyes the liquid crystal shutter glasses control signal _(LST C, C _RST) with the beginning of the N + 2 frame period, T ₁ Eye liquid crystal shutter glasses control signal C _LST to a high logic level at a point of time when the left eye liquid crystal shutter glasses control signal C _LST has passed. Further, the controller 200 generates the backlight unit control signal C _BLU as low logic with the start of the (N + 2) -th frame period, and T ₁ + T ₂ The backlight unit control signal C _BLU is inverted to the high logic level.

In Fig. 6, T ₁ is set in advance from the time when data is written in the liquid crystal cell of the display panel 10 to the time after the liquid crystal response delay time elapses. A detailed description thereof will be given later in conjunction with Fig.

T ₂ is previously set to a time corresponding to the difference between the liquid crystal rising delay time (T _R ) of the liquid crystal shutter glasses 30 and the response delay time of the LED. A detailed description thereof will be given later in conjunction with FIG.

The data drive circuitry is addressing the left-eye image data (RGB _L) to the pixels of the left-eye image data and the voltage data of (RGB _L) supplied to the data lines of the display panel is a display panel for the N + 2 frame period. The liquid crystal shutter glasses control signal receiving unit 130 receives only the left eye shutter ST _L at a point of time T ₁ elapsed from the start point of the (N + 2) -th frame period in response to the left eye liquid crystal shutter glasses control signal C _LST of high logic Open. The backlight unit driving unit 120 turns on the light sources of the backlight unit 20 at a point of time T ₁ + T ₂ elapsed from the start point of the (N + 2) -th frame period in response to the backlight unit control signal C _BLU of the high logic . (S104 to S109)

The controller 200 inverts the left eye liquid crystal shutter eyeglass control signal C _LST to low logic at a point of time T ₁ + T ₂ + T ₃ elapses from the start point of the (N + 2) -th frame period. The liquid crystal shutter glasses control signal receiving unit 130 receives the left eye liquid crystal shutter eyeglass control signal C _LST from the left eye at a point of time T ₁ + T ₂ + T ₃ from the start point of the (N + 2) Shutting off the shutter (ST _L ).

T ₃ is the time when the left-eye liquid-crystal shutter glasses control signal _(LST C) generated a high logic signal, T ₃ after the left-eye liquid-crystal shutter glasses control signal (C _LST) is inverted to the low logic. Before switching from the left eye image data RGB _{L of the} (N + 2) -th frame period to the right eye image data RGB _{R of the} (N + 3) -th frame period, the left eye shutter ST _L ) should be cut off. (S110, S111)

The controller 200 generates the display panel control signal C _DIS during the (N + 3) -th frame period. The controller 200 supplies the right eye image data RGB _R to the data driving circuit during the (N + 3) -th frame period, and generates the backlight unit control signal C _BLU with high logic. Also, the controller 200 low-logic generates the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST during the (N + 3) -th frame period.

The data drive circuitry is addressing the right-eye image data (RGB _R) to the pixels of the display panel by supplying the data voltage of the right-eye image data (RGB _R) for the N + 3 frame periods to the data lines of the display panel. The backlight unit driving unit 120 turns on the light source of the backlight unit 20 during the (N + 3) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S112, S113)

The controller 200 generates the display panel control signal C _DIS during the (N + 4) -th frame period and supplies the right eye image data RGB _R to the data driving circuit. Controller 200 includes a first N + 4, and generates the left and right eyes the liquid crystal shutter glasses control signal _(LST C, C _RST) with the beginning of a frame period to a low logic, T ₁ The right eye liquid crystal shutter glasses control signal C _RST is inverted to the high logic level. Further, the controller 200 low-logic generates the backlight unit control signal C _BLU along with the start of the (N + 4) -th frame period, and T ₁ + T ₂ The backlight unit control signal C _BLU is inverted to the high logic level.

The data drive circuitry is addressing the right-eye image data (RGB _R) to the pixels of the display panel by supplying the data voltage of the right-eye image data (RGB _R) for the N + 4 frame periods to the data lines of the display panel. The liquid crystal shutter glasses control signal receiving unit 130 receives only the right eye shutter ST _R at a point of time T ₁ elapsed from the start point of the (N + 4) frame period in response to the right eye liquid crystal shutter glasses control signal C _RST of high logic Open. The backlight unit driving unit 120 turns on the light source of the backlight unit 20 at a point of time T ₁ + T ₂ from the start point of the (N + 4) frame period in response to the backlight unit control signal C _BLU of the high logic . (S114 to S119)

The controller 200 inverts the right eye liquid crystal shutter eyeglass control signal C _RST to low logic at a point of time T ₁ + T ₂ + T ₃ elapses from the start point of the (N + 4) -th frame period. The liquid crystal shutter glasses control signal receiving unit 130 receives the right eye liquid crystal shutter glasses control signal C _RST in the right eye at a point of time T ₁ + T ₂ + T ₃ elapses from the start point of the (N + 4) Shut off the shutter (ST _R ).

T ₃ is the time when the right-eye liquid-crystal shutter glasses control signal (C _RST) is generated as a high logic signal, T ₃ after the right-eye liquid-crystal shutter glasses control signal (C _RST) it is inverted to the low logic. Before switching from the left eye image data RGB _{L of the} (N + 2) -th frame period to the right eye image data RGB _{R of the} (N + 3) -th frame period, the left eye shutter ST _L ) should be cut off. (S120 to S121)

On the other hand, in order to accelerate the response speed of the liquid crystal in the three-dimensional image, it is necessary to keep the temperature of the liquid crystal of the display panel at a predetermined temperature or more. Therefore, in Figs. 5 and 6, it is advantageous to drive the display panel that the PWM duty ratio DR is 80% to 90%.

7 is a waveform diagram showing a driving waveform of a liquid crystal shutter glasses control signal in consideration of liquid crystal characteristics of a display panel in the first embodiment of the present invention. The response time of the liquid crystal is delayed even if data is supplied with the start of the (N + 1) -th frame period, so that the luminance of the display panel reaches the target value only after a certain time from the (N + 1) -th frame period as shown in FIG. To solve this problem, by supplying the same data in the (N + 1) th and (N + 2) -th frame periods, the luminance of the display panel during the (N + 2) -th frame period can be kept constant.

T ₁ is the time from the starting point of the (N + 2) -th frame period to the point of time when the liquid crystal shutter glasses are turned on. T ₁ is set to the time after the luminance of the display panel in FIG. 7 reaches the target value. Consequently, T ₁ is set in advance from the time when data is written in the liquid crystal cell of the display panel 10 to the time after the liquid crystal response delay time elapses.

FIG. 8 is a waveform diagram showing driving waveforms of the backlight unit control signal C _BLU and the left eye liquid crystal shutter glasses control signal C _LST in detail during T ₂ and T ₃ shown in FIG. 6. 8, L _ON denotes an LED lighting delay time, T _R denotes a liquid crystal rising delay time of the liquid crystal shutter glasses, and T _F denotes a liquid crystal shutter delay time of the liquid crystal shutter glasses.

Referring to FIG. 8, the liquid crystal rising delay time T _R of the liquid crystal shutter glasses is larger than the _ON delay time L _ON of the LED. If the LED is turned on before the liquid crystal of the liquid crystal shutter glasses is fully illuminated, the user can feel the amount of light change during the liquid crystal rising delay time (T _R ). The image quality of the three-dimensional image deteriorates. Therefore, it is necessary to synchronize the lighting section of the liquid crystal shutter glasses with the lighting section of the LED.

The embodiment of the present invention is driven in consideration of the liquid crystal rising delay time (T _R ) and the LED lighting delay time (L _ON ) of the liquid crystal shutter glasses. In FIG. 8, T ₂ is previously set to a time corresponding to the difference between the liquid crystal rising delay time (T _R ) of the liquid crystal shutter glasses (30) and the lighting delay time (L _ON ) of the LED. Specifically, the liquid crystal rising delay time T _R of the liquid crystal shutter glasses 30 is later than the _ON delay time L _ON of the LEDs. Therefore, after the time T ₂ has elapsed from the application of the liquid crystal driving voltage of the liquid crystal shutter glasses 30, the driving voltage of the LED is applied to the LED. As a result, T ₂ is one time so that the rising period of the liquid crystal of the liquid crystal shutter glasses 30 and the start of the lighting period of the backlight unit 20 can be synchronized.

9A and 9B are flowcharts illustrating a method of driving a stereoscopic image display apparatus according to a second embodiment of the present invention. 10 is a waveform diagram showing driving waveforms of the stereoscopic image display apparatus according to the second embodiment of the present invention. The stereoscopic image display apparatus shown in FIG. 2 will be described in detail with reference to this embodiment.

9 to 10, the light sources of the backlight unit include LEDs. The backlight unit 20 can be divided into two or more blocks. 10, the backlight unit 20 is divided into first to third blocks (blocks 1, 2 and 3). Each block can be divided into equal sizes.

9 to 10, in the two-dimensional image, the controller 200 addresses the two-dimensional image data (RGB) to the display panel 10. The controller 200 generates the backlight unit control signal C _BLU with high logic so that the backlight unit driver 120 turns on the light source of the backlight unit 20 in response to the backlight unit control signal C _BLU of high logic . (S201, S251)

In the three-dimensional image, the controller 200 generates the display panel control signal C _DIS during the (N + 1) -th frame period. Controller 200 generates a left-eye image data for (N + 1) frame period (RGB _L) supplied to the data driver, and the backlight unit control signal (C _BLU) to a high logic. In addition, the controller 200 generates the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST as low logic during the (N + 1) -th frame period.

A data drive circuit is left-eye image data to the pixels of the (N + 1) to supply a data voltage of the left-eye image data (RGB _L) during a frame period to the data lines of the display panel 10, the display panel 10 (RGB _L) . The backlight unit driving unit 120 turns on the light source of the backlight unit 20 during the (N + 1) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S202, S203)

The controller 200 generates the display panel control signal C _DIS during the (N + 2) -th frame period and supplies the left eye image data RGB _L to the data driving circuit. Controller 200 generates a low logic to the left and right eyes the liquid crystal shutter glasses control signal _(LST C, C _RST) with the beginning of the N + 2 frame period, T ₁ Eye liquid crystal shutter glasses control signal C _LST to a high logic level at a point of time when the left eye liquid crystal shutter glasses control signal C _LST has passed. In addition, the controller 200 low-logicly generates the backlight unit control signal C _BLU along with the start of the (N + 2) -th frame period.

The data drive circuitry is addressing the left-eye image data (RGB _L) to the pixels of the left-eye image data and the voltage data of (RGB _L) supplied to the data lines of the display panel is a display panel for the N + 2 frame period. The liquid crystal shutter glasses control signal receiving unit 130 receives only the left eye shutter ST _L at a point of time T ₁ elapsed from the start point of the (N + 2) -th frame period in response to the left eye liquid crystal shutter glasses control signal C _LST of high logic Open. (S204 to S207)

The controller 200 receives T ₁ + T ₂ from the start point of the (N + 2) The backlight unit control signal C _BLU of the first block is inverted to the high logic at a time point when the backlight unit control signal C _BLU of the second block is inverted by T ₁ + T ₂ + T ₃ , High logic, and T ₁ + T ₂ + T ₃ + T ₄ The backlight unit control signal C _BLU of the third block is inverted to the high logic level.

The controller 200 calculates T ₁ + T ₂ + W ₁ from the start point of the (N + 2) The elapsed time as to highlight the backlight unit control signal (C _BLU) of a first block to a low logic, T ₁ + T ₂ + T ₃ + W _2, the backlight unit control signal in the second block to the elapsed time by a (C _BLU ) to low logic.

The backlight unit driver 120 from the start of the first block of the backlight unit control signal (C _BLU) in response to the N + 2 frame period of the high logic T ₁ + T ₂ The light sources of the backlight unit 20 of the first block are turned on from the point of time T ₁ + T ₂ + W ₁ The light sources of the backlight unit 20 of the first block are turned off.

The backlight unit driving unit 120 generates a second backlight unit control signal C _BLU in response to the backlight unit control signal C _BLU of the second block of high logic at a time point when T ₁ + T ₂ + T ₃ elapses from the start point of the (N + 2) The light sources of the backlight unit 20 of the block are turned on, and the light sources of the backlight unit 20 of the second block are turned off at the time when T ₁ + T ₂ + T ₃ + W ₂ has elapsed.

The backlight unit driving unit 120 generates the backlight unit control signal C _BLU at the point in time T ₁ + T ₂ + T ₃ + T ₄ that has elapsed from the start point of the (N + 2) The light sources of the backlight unit 20 of the third block are turned on.

11 is a view showing a display panel 10 according to a second embodiment of the present invention. 12 is a waveform diagram showing a driving waveform of the liquid crystal shutter glasses control signal C _ST in consideration of the liquid crystal characteristics of the display panel 10 in the second embodiment of the present invention.

In Fig. 11, the backlight unit 20 is divided into first and third blocks. The first to third blocks of the display panel 10 are opposed to the first to third blocks of the backlight unit 20. Pixel A is included in the first block of the display panel 10, pixel B is included in the second block, and pixel C is included in the third block.

Since the scan pulses are sequentially supplied from the top of the display panel 10, data is sequentially supplied from the first block to the third block. Therefore, as shown in FIG. 12, the response delay time of the liquid crystal is different between the pixel A of the first block, the pixel B of the second block, and the pixel C of the third block.

Further, the luminance of the display panel 10 reaches the target value only after a predetermined time elapses from the (N + 1) -th frame period as shown in Fig. To solve this problem, the brightness of the display panel 10 can be kept constant during the (N + 2) -th frame period by supplying the same data in the (N + 1) th and (N + 2) -th frame periods.

T ₁ is the time from the starting point of the (N + 2) -th frame period to the point of time when the liquid crystal shutter glasses 30 are turned ON. T ₁ is set to the time after the luminance of the display panel 10 reaches the target value in Fig. Consequently, T ₁ is set in advance from the time when data is written in the liquid crystal cell of the display panel 10 to the time after the liquid crystal response delay time elapses.

T ₂ is previously set to a time corresponding to the difference between the liquid crystal rising delay time (T _R ) of the liquid crystal shutter glasses (30) and the lighting delay time (L _ON ) of the LED of the first block. Specifically, the liquid crystal rising delay time T _R of the liquid crystal shutter glasses 30 is later than the _ON delay time L _ON of the LEDs. Therefore, after a time T ₂ has elapsed from the application of the liquid crystal driving voltage of the liquid crystal shutter glasses 30, the driving voltage of the LED of the first block is applied to the LED. As a result, T ₂ is one time to synchronize the rising period of the liquid crystal shutter glasses 30 with the beginning of the lighting period of the backlight unit 20 of the first block.

T ₃ is the time to drive the back light unit 20 in consideration of the liquid crystal response delay time of the second block of the display panel 10. As shown in Fig. 12, the luminance of the display panel 10 in the pixel B of the second block reaches the target value later than the luminance of the display panel 10 in the pixel A of the first block. Therefore, as the luminance of the display panel 10 reaches the target value later, the second block is turned on later.

T ₄ is a time to drive the back light unit 20 in consideration of the liquid crystal response delay time of the third block of the display panel 10. The luminance of the display panel 10 in the pixel C of the third block reaches later than the luminance of the display panel 10 in the pixel A of the first block and the pixel B of the second block as shown in Fig. Therefore, as the luminance of the display panel 10 reaches the target value later, the third block is turned on later. If the sizes of the first to third blocks of the backlight unit 20 are the same, T ₃ and T ₄ are the same.

W ₁ to W ₃ are the times when the backlight unit control signals C _BLU of the first to third blocks are generated as a high logic signal. Therefore, if the sizes of the first to third blocks of the backlight unit 20 are the same, W ₁ to W ₃ are the same. (S208 to S217)

The controller 200 inverts the left eye liquid crystal shutter glasses control signal C _LST to a low logic at a point of time T ₁ + T ₂ + T ₃ + T ₄ + T ₅ from the start point of the (N + 2) . From the start of the liquid crystal shutter glasses control signal reception section 130 in response to the left-eye liquid-crystal shutter glasses control signal of a low logic (C _LST), the N + 2 frame period _{T 1 + T 2 + T 3} + T 4 + T 5 And closes the left-eye shutter ST _L at a time point that has elapsed.

T ₅ is the time when the left-eye liquid-crystal shutter glasses control signal _(LST C) generated a high logic signal, T ₅ after the left-eye liquid-crystal shutter glasses control signal (C _LST) is inverted to the low logic. Before switching from the left eye image data RGB _{L of the} (N + 2) -th frame period to the right eye image data RGB _{R of the} (N + 3) -th frame period, the left eye shutter ST _L ) should be cut off. (S218, S219)

The controller 200 generates the display panel control signal C _DIS during the (N + 3) -th frame period. The controller 200 supplies the right eye image data RGB _R to the data driving circuit during the (N + 3) -th frame period, and generates the backlight unit control signal C _BLU with high logic. Also, the controller 200 low-logic generates the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST during the (N + 3) -th frame period.

The data drive circuitry is addressing the right-eye image data (RGB _R) to the pixels of the display panel by supplying the data voltage of the right-eye image data (RGB _R) for the N + 3 frame periods to the data lines of the display panel. The backlight unit driving unit 120 turns on the light sources of the backlight unit 20 during the (N + 3) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S220, S221)

The controller 200 generates the display panel control signal C _DIS during the (N + 2) -th frame period and supplies the left eye image data RGB _L to the data driving circuit. Controller 200 includes a first N + 1 generates a left and right eyes the liquid crystal shutter glasses with the beginning of a frame period control signal _(LST C, C _RST) to a low logic, and, T ₁ Eye liquid crystal shutter glasses control signal C _LST to a high logic level at a point of time when the left eye liquid crystal shutter glasses control signal C _LST has passed. In addition, the controller 200 low-logicly generates the backlight unit control signal C _BLU along with the start of the (N + 2) -th frame period.

The data drive circuitry is addressing the right-eye image data (RGB _R) to the pixels of the display panel by supplying the data voltage of the right-eye image data (RGB _R) for the N + 4 frame periods to the data lines of the display panel. The liquid crystal shutter glasses control signal receiving unit 130 receives only the right eye shutter ST _R at a point of time T ₁ elapsed from the start point of the (N + 4) frame period in response to the right eye liquid crystal shutter glasses control signal C _RST of high logic Open. (S222 to S225)

The controller 200 receives T ₁ + T ₂ from the start point of the (N + 4) The backlight unit control signal C _BLU of the first block is inverted to the high logic at a time point when the backlight unit control signal C _BLU of the second block is inverted by T ₁ + T ₂ + T ₃ , High logic, and T ₁ + T ₂ + T ₃ + T ₄ The backlight unit control signal C _BLU of the third block is inverted to the high logic level.

The controller 200 reads T ₁ + T ₂ + W ₁ from the start point of the (N + 4) The elapsed time as to highlight the backlight unit control signal (C _BLU) of a first block to a low logic, T ₁ + T ₂ + T ₃ + W _2, the backlight unit control signal in the second block to the elapsed time by a (C _BLU ) to low logic.

The backlight unit driving unit 120 generates the backlight unit control signal C _BLU of the first block at the timing when the time T ₁ + T ₂ from the start point of the (N + 4) The light sources of the unit 20 are turned on, and the light sources of the backlight unit 20 of the first block are turned off from the point of time T ₁ + T ₂ + W ₁ .

The backlight unit driving unit 120 generates a second backlight unit control signal C _BLU in response to the backlight unit control signal C _BLU of the second block of high logic at a time point when T ₁ + T ₂ + T ₃ elapses from the start point of the (N + 2) The light sources of the backlight unit 20 of the block are turned on, and the light sources of the backlight unit 20 of the second block are turned off from the point of time T ₁ + T ₂ + T ₃ + W ₂ .

The backlight unit driving unit 120 generates the backlight unit control signal C _BLU at the point in time T ₁ + T ₂ + T ₃ + T ₄ that has elapsed from the start point of the (N + 2) The light sources of the backlight unit of the third block are turned on. (S226 to S235)

The controller 200 inverts the right eye liquid crystal shutter glasses control signal C _RST to the low logic at a point of time T ₁ + T ₂ + T ₃ + T ₄ + T ₅ from the start point of the (N + 4) . The liquid crystal shutter glasses control signal receiving unit 130 receives T ₁ + T ₂ + T ₃ + T ₄ + T ₅ from the start point of the (N + 4) frame period in response to the low logic right eye liquid crystal shutter glasses control signal C _RST The right-eye shutter ST _R is blocked.

T ₅ is a time generated by the right eye liquid crystal shutter glasses control signal (C _RST) is at a high logic signal, T ₅ since the liquid crystal shutter glasses control signal (C _RST) for the right eye is inverted to the low logic. Eye shutter of the liquid crystal shutter glasses 30 to prevent 3D crosstalk before changing from the right eye image data RGB _{R of the} (N + 4) -th frame period to the left eye image data RGB _{L of the} (N + ST _R ) must be blocked. (S236, S237)

13 is a flowchart illustrating a method of driving a stereoscopic image display apparatus according to a third embodiment of the present invention. 14 is a waveform diagram showing driving waveforms of a stereoscopic image display apparatus according to a third embodiment of the present invention. The stereoscopic image display apparatus shown in FIG. 2 will be described in detail with reference to this embodiment.

13 and 14, the light sources of the backlight unit 20 include a fluorescent lamp. The fluorescent lamp may be a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL).

13 and 14, in the two-dimensional image, the controller 200 addresses the two-dimensional image data (RGB) on the display panel. The controller 200 generates the backlight unit control signal C _BLU with high logic so that the backlight unit driver 120 turns on the light sources of the backlight unit 20 in response to the backlight unit control signal C _BLU of high logic . (S301, S351)

In the three-dimensional image, the controller 200 generates the display panel control signal C _DIS during the (N + 1) -th frame period. Controller 200 generates a left-eye image data for (N + 1) frame period (RGB _L) supplied to the data driver, and the backlight unit control signal (C _BLU) to a high logic. In addition, the controller 200 generates the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST as low logic during the (N + 1) -th frame period.

The data drive circuitry is addressing the left-eye image data (RGB _L) to the pixels of the left-eye image data and the voltage data of (RGB _L) supplied to the data lines of the display panel is a display panel for a (N + 1) frame period. The backlight unit driving unit 120 turns on the light sources of the backlight unit 20 during the (N + 1) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S302, S303)

The controller 200 generates the display panel control signal C _DIS during the (N + 2) -th frame period and supplies the left eye image data RGB _L to the data driving circuit. Controller 200 generates a low logic to the left and right eyes the liquid crystal shutter glasses control signal _(LST C, C _RST) with the beginning of the N + 2 frame period, T ₁ Eye liquid crystal shutter glasses control signal C _LST to a high logic level at a point of time when the left eye liquid crystal shutter glasses control signal C _LST has passed. Further, the controller 200 generates the backlight unit control signal C _BLU with high logic during the (N + 2) -th frame period.

The data drive circuitry is addressing the left-eye image data (RGB _L) to the pixels of the left-eye image data and the voltage data of (RGB _L) supplied to the data lines of the display panel is a display panel for the N + 2 frame period. The liquid crystal shutter glasses control signal receiving unit 130 receives only the left eye shutter ST _L at a point of time T ₁ elapsed from the start point of the (N + 2) -th frame period in response to the left eye liquid crystal shutter glasses control signal C _LST of high logic Open. The backlight unit driving unit 120 turns on the fluorescent lamp, which is the light source of the backlight unit 20, during the (N + 2) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S304 to S307)

The controller 200 inverts the left eye liquid crystal shutter eyeglass control signal C _LST to the low logic at a point of time T ₁ + T ₂ elapses from the start point of the (N + 2) -th frame period. The liquid crystal shutter glasses control signal receiving unit 130 is left-eye shutter (ST to the elapsed time as T ₁ + T ₂ from the starting point of the N + 2 frame period in response to the left-eye liquid-crystal shutter glasses control signal (C _LST) of low logic _L ).

T ₁ is set in advance from the time when data is written to the liquid crystal cell of the display panel 10 to the time after the liquid crystal response delay time elapses. This is described in FIG.

T ₂ is the time at which the left eye liquid crystal shutter glasses control signal C _LST is generated as a high logic signal, and after the time T ₂ , the left eye liquid crystal shutter eye glasses control signal C _LST is inverted to low logic. Before switching from the left eye image data RGB _{L of the} (N + 2) -th frame period to the right eye image data RGB _{R of the} (N + 3) -th frame period, the left eye shutter ST _L ) should be cut off. (S308, S309)

The controller 200 generates the display panel control signal C _DIS during the (N + 3) -th frame period. The controller 200 supplies the right eye image data RGB _R to the data driving circuit during the (N + 3) -th frame period, and generates the backlight unit control signal C _BLU with high logic. Also, the controller 200 low-logic generates the left eye and right eye liquid crystal shutter glasses control signals C _LST and C _RST during the (N + 3) -th frame period.

The data drive circuitry is addressing the right-eye image data (RGB _R) to the pixels of the display panel by supplying the data voltage of the right-eye image data (RGB _R) for the N + 3 frame periods to the data lines of the display panel. The backlight unit driving unit 120 turns on the light sources of the backlight unit 20 during the (N + 3) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S310, S311)

The controller 200 generates the display panel control signal C _DIS during the (N + 4) -th frame period and supplies the right eye image data RGB _R to the data driving circuit. Controller 200 includes a first N + 4, and generates the left and right eyes the liquid crystal shutter glasses control signal _(LST C, C _RST) with the beginning of a frame period to a low logic, T ₁ The right eye liquid crystal shutter glasses control signal C _RST is inverted to the high logic level. In addition, the controller 200 generates the backlight unit control signal C _BLU with high logic during the (N + 4) -th frame period.

The data driving circuit supplies the data voltages of the left eye image data RGB _R to the data lines of the display panel during the (N + 4) -th frame period to address the right eye image data RGB _R to the pixels of the display panel. The liquid crystal shutter glasses control signal receiving unit 130 receives only the right eye shutter ST _R at a point of time T ₁ from the start point of the (N + 2) -th frame period in response to the right eye liquid crystal shutter glasses control signal C _RST of high logic Open. The backlight unit driving unit 120 turns on the light sources of the backlight unit 20 during the (N + 2) -th frame period in response to the backlight unit control signal C _BLU of the high logic. (S312 to S315)

The controller 200 inverts the right eye liquid crystal shutter eyeglass control signal C _RST to the low logic at a point of time T ₁ + T ₂ elapses from the start point of the (N + 4) -th frame period. The liquid crystal shutter glasses control signal receiving unit 130 receives the right eye shutter (ST) at a point of time T ₁ + T ₂ from the start point of the (N + 4) -th frame period in response to the low-logic right eye liquid crystal shutter glasses control signal C _{RST R} ).

T ₂ is a time at which the right eye liquid crystal shutter glasses control signal C _RST is generated as a high logic signal, and after T ₂ , the right eye liquid crystal shutter glasses eye control signal C _RST is inverted to low logic. Eye shutter of the liquid crystal shutter glasses 30 to prevent 3D crosstalk before changing from the right eye image data RGB _{R of the} (N + 4) -th frame period to the left eye image data RGB _{L of the} (N + ST _R ) must be blocked. (S308, S309)

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the present invention should not be limited to the details described in the detailed description, but should be defined by the claims.

10: display panel 20: backlight unit
30: LCD shutter glasses
110: display panel driving unit 120: backlight unit driving unit
130: liquid crystal shutter glasses control signal receiving unit
140: liquid crystal shutter glasses control signal transmitter
200: controller
L _on : LED lighting delay time
T _r : Liquid crystal rising delay time of liquid crystal shutter glasses
T _f : LCD polling delay time of liquid crystal shutter glasses
W _{1 :} High logic level of PWM signal (backlight unit lighting time)
W _{2 :} Low logic level of PWM signal (backlight unit off time)

Claims (21)

A display panel in which a left eye image is displayed during the (N + 1) th frame period and a right eye image is displayed during the (N + 3) th and (N + 4) th frame periods;
A backlight unit including a plurality of LEDs for emitting light to the display panel;
Wherein the controller is configured to open only the left-eye shutter after an elapse of a liquid crystal response delay time of the display panel in the (N + 2) -th frame period, And a liquid crystal shutter glasses for opening only the right eye shutter after the liquid crystal response delay time of the panel has elapsed,
Wherein the LED comprises:
The (N + 1) th and (N + 3) -th frame periods,
And turns off at the beginning of the (N + 2) th and (N + 4)
And is lit in synchronization with the opening of the left eye shutter within the (N + 2) -th frame period, and is lit in synchronization with the opening of the right eye shutter within the (N + 4) -th frame period. delete delete The method according to claim 1,
And the duty ratio for controlling the lighting time of the LED is 80% to 90% in the (N + 1) th to (N + 4) th frame periods. A display panel in which a left eye image is displayed during the (N + 1) th frame period and a right eye image is displayed during the (N + 3) th and (N + 4) th frame periods;
A backlight unit including a plurality of LEDs for emitting light to the display panel;
Wherein the controller is configured to open only the left-eye shutter after an elapse of a liquid crystal response delay time of the display panel in the (N + 2) -th frame period, And a liquid crystal shutter glasses for opening only the right eye shutter after the liquid crystal response delay time of the panel has elapsed,
Wherein the backlight unit is divided into at least two blocks along a scan direction of data of the display panel, the blocks are sequentially lighted in accordance with a scan direction of the data by lighting of the LED,
The blocks are all turned on in the (N + 1) th and (N + 3) -th frame periods,
And is extinguished at the beginning of the (N + 2) th and (N + 4)
Within the (N + 2) -th frame period, the blocks are sequentially turned on and off from the most significant block to the least significant block of the backlight unit, the most significant block is turned on in synchronization with the opening of the left eye shutter, And the stereoscopic image display device is turned off in synchronization with the interruption of the left-eye shutter. delete delete 6. The method of claim 5,
Wherein the blocks are sequentially turned on and off from a top block to a bottom block of the backlight unit in the (N + 4) frame period, the top block is lit in synchronization with the opening of the right eye shutter, And is extinguished in synchronization with interception of the right eye shutter. 9. The method according to claim 5 or 8,
And each of the uppermost layer and the lowest layer blocks is lit for the same time. delete delete delete delete delete delete delete delete delete delete delete delete

Images