KR101211467B1 - stereoscopic 3 dimension display apparatus and display method using the same - Google Patents

Abstract

The present invention relates to a parallax barrier type stereoscopic image display apparatus capable of realizing a more uniform high luminance image in each of the 2D mode displaying a planar image and the 3D mode displaying a stereoscopic image, and an image display method using the same.

Specifically, the present invention provides a stereoscopic image display device for selectively implementing a 2D mode and a 3D mode, comprising: a main liquid crystal panel displaying a planar image; A parallax barrier liquid crystal panel that transmits light over the entire surface in the 2D mode and displays a parallax barrier pattern overlapping the planar image in the 3D mode; A backlight provided behind the main liquid crystal panel to supply light having a first brightness to the main liquid crystal panel in the 2D mode and to supply light having a second brightness higher than the first brightness to the main liquid crystal panel in the 3D mode. It provides a stereoscopic image display device and an image display method comprising a.

Description

Stereoscopic 3 dimension display apparatus and display method using the same}

1 is a schematic diagram of a conventional Paralex barrier type stereoscopic image display device.

2A and 2B are cross-sectional views of 2D and 3D modes of a general Parallax barrier type stereoscopic image display device, respectively.

3 is a simplified exploded perspective view of a stereoscopic image display device according to the present invention.

Figure 4 is an exploded perspective view of the main liquid crystal panel according to the present invention.

5 is an exploded perspective view of the parallax barrier liquid crystal panel according to the present invention;

6 is a cross-sectional view of a hot cathode fluorescent lamp of the stereoscopic image display apparatus according to the present invention.

7A and 7B are waveform diagrams of input currents for a hot cathode fluorescent lamp of a stereoscopic image display device according to the present invention, respectively.

8A and 8B are cross-sectional views of 2D and 3D modes of a stereoscopic image display device according to the present invention, respectively.

<Description of the symbols for the main parts of the drawings>

110: main liquid crystal panel 102, 112: first and second substrate

130: Paralex barrier liquid crystal panel 132, 142: third and fourth substrate

150: backlight 160: hot cathode fluorescent lamp

162 glass tube 172174 first and second electrodes

182: reflective sheet 184: optical sheet

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic 3 dimension display apparatus and an image display method, and is more uniform in each of 2D mode for displaying planar images and 3D mode for displaying 3D images. A parallax barrier type stereoscopic image display apparatus and an image display method capable of realizing a high brightness image are provided.

A general three-dimensional stereoscopic image is based on the stereo visual principle of two eyes.

The parallax of the two eyes, that is, the binocular disparity due to the distance between the two eyes, which is about 65 mm apart, is an important factor that makes you feel a three-dimensional feeling. Two different images can be fused to reproduce the original depth and realism of a three-dimensional image, and this ability is called stereography. Accordingly, three-dimensional stereoscopic image technology using stereography has been introduced, and specific examples thereof include an eyeglass type stereoscopic image display, a holographic display, and an autostereoscopic stereoscopic image display method.

However, the method of displaying stereoscopic images by special glasses shows the inconvenience that many people can enjoy stereoscopic images at the same time, but requires separate polarized glasses or liquid crystal shutter glasses, and minimizes the effect of the observer's position. The holographic display method, known as 3D stereoscopic image, exhibits technical difficulties and large equipments for implementing laser reference light.

On the other hand, in the case of an autostereoscopic 3D display method, despite the disadvantage that the observation range is fixed and limited to a small number of people, it is not preferable that separate glasses are required and the device configuration is simple, and thus the 3D image implementation method is preferred. BACKGROUND ART A parallax barrier type stereoscopic image display device that separates and displays stereo images for left and right eyes so that an observer feels three-dimensional three-dimensional images has been in the spotlight.

Briefly looking at the three-dimensional image implementation principle of the parallax barrier-type stereoscopic image display device, by overlaying the aperture and the barrier (barrier) in the planar image displaying the left / right image for the observer The main component is a main display device for displaying a planar image and a parallax barrier that provides stripe-shaped openings and barriers.

1 is a schematic diagram illustrating a typical Paralex barrier type stereoscopic image display device, in particular, a liquid crystal panel 10 is used as a main display device.

In this case, the liquid crystal panel 10 alternately defines a left eye pixel L for displaying left eye image information and a right eye pixel R for displaying right eye image information, and a backlight, which is a separate dimming device, on the back of the liquid crystal panel 10. (backlight: 20) is provided. In addition, a parallax barrier 30 is interposed between the liquid crystal panel 10 and the observer 40 or between the liquid crystal panel 10 and the backlight 20, and the light from the left and right pixels L and R is interposed therebetween. The slits 32 and the barriers 34 for selectively passing the slit 32 are repeatedly arranged in a stripe shape in the longitudinal direction with respect to the observer 40.

Accordingly, the light L1 passing through the left eye pixel L of the liquid crystal panel 10 among the light emitted from the backlight 20 passes through the slit 32 of the parallax barrier 30 to the left eye of the observer 40. When the light R1 reaches the right eye pixel R of the liquid crystal panel 10, the light R1 reaches the right eye of the observer 40 through the slit 32 of the parallax barrier 30. The display images of the pixels L and R each contain parallax information that can be sensed by humans, and as a result, the observer 40 recognizes a 3D stereoscopic image by stereography.

Meanwhile, the above description relates to the most conventional parallax barrier type stereoscopic image display, in which the slit 32 and the barrier 34 on the parallax barrier 30 are permanently fixed so that the application range is limited to 3D stereoscopic images only. It shows a disadvantage. Furthermore, when viewing 3D stereoscopic image implemented through stereography by binocular parallax for a long time, the observer 40 may feel side effects such as nausea or fatigue.

As a result, an improved form of the parallax barrier type stereoscopic image display has been introduced, and a technology capable of freely selecting a 2D mode for displaying a planar image and a 3D mode for displaying a stereoscopic image according to a user's intention has been introduced. By implementing a parallax barrier using a parallax barrier liquid crystal panel for convenience, the parallax barrier liquid crystal panel transmits light through the entire surface without any action in 2D mode but transmits light in 3D mode. The transmission area of the role and the barrier area of the barrier that blocks light are repeatedly displayed in a stripe form.

2A and 2B are cross-sectional views of a general stereoscopic image display device using a Parallax barrier liquid crystal panel 50, respectively, and FIG. 2A shows an operating state in a 2D mode and FIG. 2B. As shown, the three-dimensional image display device includes a main liquid crystal panel 10 showing a difference in transmittance for a planar image, a backlight 20 for supplying light from the rear surface of the main liquid crystal panel 10 so that the difference in transmittance thereof is projected to the outside. And a parallax barrier liquid crystal panel 50 interposed between the main liquid crystal panel 10 and the backlight 20.

In this case, the main liquid crystal panel 10 is composed of first and second substrates 2 and 4 bonded side by side with the first liquid crystal layer 8 interposed therebetween, similarly to that of a general active matrix type. By changing the arrangement direction of the liquid crystal molecules through the electric field between the two substrates (2, 4) to realize the transmittance difference due to the optical anisotropy and polarization of the liquid crystal. In the main liquid crystal panel 10, pixels, which are basic units of image expression, are defined in a matrix form, and each pixel includes a pixel and a common electrode that face each other with the first liquid crystal layer 8 interposed therebetween. A thin film transistor (TFT) may be provided to switch on / off a liquid crystal driving voltage delivered to each pixel electrode.

The difference in transmittance of the main liquid crystal panel 10 is finally displayed to the outside through the light of the backlight 20.

In addition, the Parallax barrier liquid crystal panel 50 interposed between the main liquid crystal panel 10 and the backlight 20 is also used as the third and fourth substrates 52 and 54 bonded to each other with the second liquid crystal layer 58 interposed therebetween. However, unlike the main liquid crystal panel 10, a stripe-shaped first electrode 62 having a predetermined interval without division of pixels is arranged on an inner surface of one substrate, and a second electrode opposite to the inner surface of the other substrate ( 64). The liquid crystal driving voltage is applied to the first electrode 62 only in the 3D mode under the premise that the second liquid crystal layer 58 is a normal white mode of a twisted nematic liquid crystal.

As a result, in the case of the 2D mode of FIG. 2A in which no electric field is formed inside the parallax barrier liquid crystal panel 50, the parallax barrier liquid crystal panel 50 exhibits a normal white state, and thus, the backlight 20 is used. By simply transmitting the emitted light, the viewer sees a planar image of the main liquid crystal panel 10. On the other hand, in the 3D mode of FIG. 2B in which the liquid crystal driving voltage is supplied to the first electrode 62, only the portion corresponding to the first electrode 62 is selectively driven in the region of the second liquid crystal layer 58. Black is displayed and other white is displayed. As the barrier provides a barrier region (B) acting as a stripe and a transmission region (T) serving as an opening role, the observer can display an image of the main liquid crystal panel 10. It is recognized in three dimensions.

However, the general Paralex barrier type stereoscopic image display device described above exhibits one fatal problem, which is a phenomenon in which the brightness of a display image is significantly different in 2D mode and 3D mode.

That is, as described above, the light emitted from the backlight 20 in the 2D mode displaying the planar image passes through both the Pararex barrier liquid crystal panel 50 and the main liquid crystal panel 10 and reaches the observer. A considerable amount of light loss follows.

Furthermore, in 3D mode, the Pararex barrier liquid crystal panel 50 newly displays the black blocking area B to block the light passing through the part, thereby greatly increasing the light loss, and as a result, the backlight is contrasted with the 2D mode. From 20), the amount of light emitted to the viewer is greatly reduced in proportion to the total area of the blocking area (B). As a specific example, in the case of a liquid crystal display device for a large TV of 20 inches or more, an average luminance image of about 400 nits is displayed based on the 2D mode, but the area occupied by the blocking area B in the 3D mode is the entire display image. The average luminance of the 3D mode stereoscopic image is about 300 nit, which is about 25% of the area, and thus the display of a high luminance 3D stereoscopic image is practically impossible.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to present a concrete strategy for realizing a more uniform high luminance image in each of the 2D mode for the planar image and the 3D mode for the 3D image.

In order to achieve the above object, the present invention provides a stereoscopic image display device for selectively implementing a 2D mode and a 3D mode, comprising: a main liquid crystal panel displaying a planar image; A parallax barrier liquid crystal panel that transmits light over the entire surface in the 2D mode and displays a parallax barrier pattern overlapping the planar image in the 3D mode; A backlight provided behind the main liquid crystal panel to supply light having a first brightness to the main liquid crystal panel in the 2D mode and to supply light having a second brightness higher than the first brightness to the main liquid crystal panel in the 3D mode. It provides a stereoscopic image display device comprising a. In this case, the parallax barrier pattern is characterized in that the barrier (a) of the first width and the opening (b) of the first interval are repeatedly arranged in a stripe shape, and the second luminance is the (a +) of the first luminance. and b) / b times or more.

And the backlight includes a plurality of hot cathode fluorescent lamps arranged side by side on one rear surface of the liquid crystal panel, wherein the backlight changes an amplitude level of an input current supplied to each of the hot cathode fluorescent lamps. The first and second luminance is implemented through a linear dimming scheme or a burst dimming scheme for changing an on-duty time of the input current. The backlight includes the plurality of hot cathode fluorescent lamps and the liquid crystal panel. An optical member interposed therebetween; And a reflective sheet for providing a reflective surface behind the plurality of hot cathode fluorescent lamps.

The parallax barrier liquid crystal panel is positioned in front of the main liquid crystal panel or between the main liquid crystal panel and the backlight, wherein the main liquid crystal panel is face-to-face bonded with a first liquid crystal layer interposed therebetween. First and second substrates of which pixels are defined; A pixel and a common electrode mounted on the pixels and opposed to each other with the first liquid crystal layer interposed therebetween; And a thin film transistor connected to the pixel electrode in a one-to-one correspondence. The parallax barrier liquid crystal panel includes: third and fourth substrates bonded to each other with a second liquid crystal layer interposed therebetween; A first electrode arranged on the inner surface of the third substrate in a stripe shape at a predetermined interval; And a second electrode formed on an inner surface of the fourth substrate.

In addition, the present invention is an image display method of a three-dimensional image display device including a main liquid crystal panel, a Paralex barrier liquid crystal panel, and a backlight, wherein the main liquid crystal panel displays a planar image, the parallax barrier liquid crystal panel in front Light is transmitted through the backlight, and the backlight emits light having a first brightness to display a 2D planar image, or the main liquid crystal panel displays a planar image, and the Paralex barrier liquid crystal panel displays a Paralex barrier pattern. In addition, the backlight provides an image display method of displaying a stereoscopic 3D by emitting light of a second luminance higher than the first luminance.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

3 is an exploded perspective view of a stereoscopic image display device according to an embodiment of the present invention, in which a main liquid crystal panel 100 displaying a planar image and a parallax barrier pattern selectively displaying the planar image are overlapped. Rex barrier liquid crystal panel 130 and the backlight 150 for supplying light from the rear as an essential component, although the parallax barrier between the main liquid crystal panel 100 and the backlight 150 stacked up and down in the figure Although the form in which the liquid crystal panel 130 is interposed is shown, the Parallax barrier liquid crystal panel 130 may be disposed in front of the main liquid crystal panel 100 as needed, and the Paralex barrier liquid crystal panel 130 may be in the 3D mode. Only displays the Paralex barrier pattern.

Look at each of them in more detail.

First, the main liquid crystal panel 100 may have the same structure as an active matrix liquid crystal panel used in a notebook computer, a TV, or various display devices, and thus, the first and second substrates bonded with the first liquid crystal layer interposed therebetween. (102,112), in which a pixel of a matrix form is defined. Each pixel between the two substrates 102 and 112 is provided with a pixel and a common electrode facing each other with a first liquid crystal layer interposed therebetween, and a thin film transistor connected to each pixel electrode in a one-to-one correspondence. 4 is shown in an exploded perspective view.

As shown in the drawing, the main liquid crystal panel 100 has a shape in which the first liquid crystal layer 110 is interposed between the first and second substrates 102 and 112, and a plurality of gate wirings are formed on the inner surface of the first substrate 102. When the 104 and the data lines 106 intersect, the pixels P having a matrix form are repeatedly defined vertically and horizontally, and the thin film transistors T are provided at the intersections of the gate lines 104 and the data lines 106. One-to-one correspondence with the transparent pixel electrode 108 mounted in the pixel P is performed. In addition, the inner surface of the second substrate 112 facing the first substrate 102 with the first liquid crystal layer 110 interposed to cover non-display elements such as the gate and data lines 104 and 106 and the thin film transistor T. A lattice-like black matrix 114 exposing only the pixel electrode 108 and a color filter 116 filled in each lattice thereof, for example, red, green, and blue color filters 116a, 116b, and 116c and a black matrix ( The common electrode 118 covering the 114 and the color filter 116 is provided.

Although not clearly shown in the drawings, an alignment layer for determining an initial alignment direction of liquid crystal molecules may be interposed on inner surfaces of the first and second substrates 102 and 112 contacting the first liquid crystal layer 110. 2 The polarizing plates for controlling the polarization characteristics of light may be attached to the outer surfaces of the substrates 102 and 112. In addition, driving circuits are connected along at least one edge of the main liquid crystal panel 100 through a flexible circuit board, a tape carrier package (TCP), and the like, which are connected to the plurality of gate lines 104 of the thin film transistor T. It can be divided into a gate driver circuit that scans the on / off control signal and a data driver circuit that transmits the image signal to the plurality of data lines 106. When the thin film transistor T selected for each gate line 104 is turned on, the data signal of the data line 106 is transferred to the corresponding pixel electrode 108, thereby causing the pixel electrode 108 and the common electrode. The arrangement direction of the liquid crystal molecules is changed by the perpendicular electric field between 118 to show the transmittance difference.

3 again, the parallax barrier liquid crystal panel 130 converts the planar image of the main liquid crystal panel 100 into 2D or 3D mode according to a user's selection. On the other hand, in the 3D mode, the transmission area of the slit which transmits the light and the blocking area of the barrier which blocks the light are repeatedly displayed in the form of stripes.

The parallax barrier liquid crystal panel 130 may have the same shape as the exploded perspective view of FIG. 5. The parallax barrier liquid crystal panel 130 may include the third and fourth substrates 132 and 142 bonded side by side with the second liquid crystal layer 140 interposed therebetween. The first electrode 134 in a stripe shape that faces the viewer in the longitudinal direction is arranged at an interval on the inner surface of the third substrate 132, and the second electrode 144 is disposed on the inner surface of the fourth substrate 142. It is prepared. In addition, a liquid crystal driving voltage is applied to the first electrode 134 only in the 3D mode under the assumption that the second liquid crystal layer 140 is a twisted nematic liquid crystal representing normal white.

As a result, in the 2D mode in which there is no electrical action between the first and second electrodes 134 and 144, the Paralex barrier liquid crystal panel 130 maintains the normal white state and transmits the light over the entire surface. 134) When only the liquid crystal driving voltage is supplied, only the liquid crystal of the corresponding portion is driven to display the black blocking area, and otherwise, to show the white transmitting area. The transmissive region serving as the opening shows a parallax barrier pattern that is repeatedly arranged in a stripe form.

Subsequently, the backlight 150 for supplying light to the main liquid crystal panel 100 including the Paralex barrier liquid crystal panel 130 is, as illustrated in FIG. 3, the main liquid crystal panel 100, more specifically, the parallax barrier liquid crystal panel. An essential component is a plurality of fluorescent lamps 160 arranged side by side on any one plane behind the 130, and interposed between the plurality of fluorescent lamps 160 and the main liquid crystal panel 100. The optical sheet 184 for processing the light emitted from the 160 to a high quality uniform brightness and a reflective sheet 182 for minimizing light loss by providing a reflective surface behind the fluorescent lamp 160.

As a result, the light emitted from the plurality of fluorescent lamps 160 is processed at a high quality uniform brightness while passing through the optical sheet 184 together with the light reflected by the reflective sheet 182 to produce the parallax barrier liquid crystal panel 130. It is supplied to the main liquid crystal panel 100.

On the other hand, the backlight 150 of the stereoscopic image display device according to the present invention described above is characterized in that it emits light of different brightness, especially in the 2D mode and 3D mode, if the 2D mode is the first brightness arbitrarily 3D In the mode, light having a higher second luminance is supplied to the main liquid crystal panel and the parallax barrier liquid crystal panels 100 and 130. For this purpose, a plurality of fluorescent lamps 160 are called hot cathode fluorescent lamps (HCFLs), and the luminous efficiency is controlled according to the input current of the plurality of fluorescent lamps 160 in the 2D and 3D modes, respectively. An image and a stereoscopic image having a second luminance are realized.

At this time, the hot cathode fluorescent lamp changes the ultraviolet rays generated by the mercury (Hg) discharge by hot electrons into visible light according to the photo luminescence characteristic of the fluorescent material, and is used as a cold light source for a normal backlight ( Compared with Cold Cathode Flourscent Lamp (CCFL) or External Electrode Flourscent Lanm (EEFL), it is well known as the fluorescent lamp with the largest maximum luminance.

As a specific example, in order to realize an average luminance of 400 nit required for a liquid crystal display device for a 20-inch or larger TV, more than 22 devices for maintaining the luminous efficiency 100% are used in the case of a cold cathode fluorescent lamp or an internal electrode fluorescent lamp. In the case of the hot cathode fluorescent lamp, the same luminance can be realized by only about 10 scan driving units having a luminous efficiency of 30%. In the present invention, the hot cathode fluorescent lamp showing the above optical characteristics is used as a light source of the backlight 130. At the same time, the luminance of the hot cathode fluorescent lamp is appropriately adjusted to realize an optimal high luminance image in each of the 2D and 3D modes.

6 is a partial cross-sectional view of the hot cathode fluorescent lamp according to the present invention. Referring to FIG. 3, the hot cathode fluorescent lamp is denoted by the same reference numeral 160 as the fluorescent lamp.

As shown, the hot cathode fluorescent lamp 160 according to the present invention comprises a glass tube 162 and first and second electrodes 172 and 174 provided at both ends thereof.

At this time, a discharge gas such as argon (Ar) or neon (Ne) containing mercury (Hg) is filled in the glass tube 162, and a rare earth element that emits visible light by ultraviolet rays is disposed on the inner surface of the glass tube 162. As a phosphor, phosphors such as yttrium (Y), cerium (Ce) and terbium (Tb) are painted. In addition, tungsten (W) coils coated with oxide emitters such as barium (Ba) and calcium (Ca) are respectively disposed at ends of the first and second electrodes 172 and 174 introduced into the glass tube 162. The filament 170 of the coil is connected, and thermal electron radiation is started from the filament 170 of the cathode electrode by the alternating voltage supplied to the first and second electrodes 172 and 174, and the inside of the glass tube 162 Electrical insulation breakdown is induced, and ultraviolet rays generated through mercury discharge by free electrons are changed into visible light while passing through the fluorescent material on the inner surface of the glass tube 162.

At this time, in the present invention, the input current is adjusted in order to control the light emission luminance of the hot cathode fluorescent lamp 160. The method of controlling the input current is largely the magnitude of the input current supplied to the hot cathode fluorescent lamp 160, that is, Linear dimming to adjust the amplitude level of the input current or on / off time interval of the hot cathode fluorescent lamp, that is, burst dimming to adjust the on duty width of the input current. Can be.

That is, FIG. 7A is a view illustrating input current waveforms supplied to the hot cathode fluorescent lamp 160 in the linear dimming method according to the present invention, and FIG. 7B is a view illustrating input current waveforms in the burst dimming method, respectively. In the figure, the input current of (a) realizes a higher luminance than the input current of (b).

In addition, I1 and I2 represent amplitude levels of the input current supplied to the hot cathode fluorescent lamp 160 in the linear dimming method, and T1 and T2 represent the time when the hot cathode fluorescent lamp 160 is turned on in the burst dimming method, that is, on duty ( on duty) time, and referring to FIG. 7A, it can be seen that the brightness is controlled by adjusting the amplitude levels I1 and I2 of the input current delivered to the hot cathode fluorescent lamp 160, and accordingly, the hot cathode fluorescent lamp The backlight shows first and second luminous efficiencies that emit light of first and second brightness, respectively, according to the amplitude level of the input current while maintaining the on state of 160. On the other hand, in FIG. 7B, the brightness is controlled by adjusting the on-duty time T1 and T2 of the hot cathode fluorescent lamp 160, that is, the emission period, while maintaining the same amplitude level I of the input current, and the hot cathode fluorescent lamp 160. According to the on / off cycle of), the backlight represents the first or second luminous efficiency.

In this case, the first and second luminous efficiencies of the backlight according to the present invention are respectively determined by the area of the transmission region T and the blocking region B indicated by the Paralex barrier liquid crystal panel (see 130 of FIG. 8B). It is closely related. That is, for convenience, the backlight is emitted in 2D mode under the assumption that the width of the blocking area B displayed by the Paralex barrier liquid crystal panel 130 is a and the width of the transmission area T corresponding to the gap therebetween is b. If the efficiency is A%, the luminance of the final 2D display image is x, and the luminance Z of the final 3D display image in accordance with the luminous efficiency B% of the backlight in 3D mode is

In this case, α corresponds to the intrinsic coefficient of the thermocathode fluorescent lamp in consideration of a reduction factor such as a heat increase accompanied by an increase in the luminance of light emitted by the thermocathode fluorescent lamp 160. As a result, when ignoring the influence of the coefficients caused by the intrinsic characteristics of the hot cathode fluorescent lamp, the second luminance due to the second luminous efficiency of the backlight is at least (a + b) / b times the first luminance due to the first luminous efficiency. In this case, the average luminance of the 3D image in the stereoscopic image may be greater than the average luminance of the planar image in the 2D mode.

Hereinafter, the image display method by the stereoscopic image display apparatus according to the present invention will be summarized with reference to FIGS. 8A and 8B.

8A and 8B are cross-sectional views of the 2D mode and the 3D mode using the stereoscopic image display device according to the present invention, respectively, and the first and second electrodes of the Paralex barrier liquid crystal panel 150 in the 2D mode of FIG. 8A. The potential difference between the electrodes 134 and 144 represents less than a threshold voltage required for driving the second liquid crystal layer 140, and thus the parallax barrier liquid crystal panel 150 maintains normal white. In addition, since the backlight 130 receives light having the first luminance H1 due to the first luminous efficiency, the viewer can observe a 2D image of the main liquid crystal panel 100.

Next, in the 3D mode of FIG. 8B, a voltage equal to or higher than a driving threshold voltage of the second liquid crystal layer 140 is applied to the first electrode 134 of the Parallax barrier liquid crystal panel 150. Accordingly, the second liquid crystal layer 140 is applied. Is a parallax barrier pattern in which a barrier region B acting only on a portion corresponding to the first electrode 134 to block light and a transmission region T acting as an opening to transmit light are repeatedly arranged in a stripe shape. Indicates. In this case, the backlight emits light of the second luminance H2 due to the second luminous efficiency greater than the first luminous efficiency, which is based on the premise that the blocking area width of the parallax barrier liquid crystal panel 150 is a and the width of the transmitting area is b. Under the present invention, a second luminous efficiency of (a + b) / b times or more of the first luminous efficiency is shown. An observer can observe a 3D stereoscopic image having an average luminance equal to or higher than that of the 2D planar image.

As a result, the stereoscopic image display apparatus and the image display method according to the present invention have an advantage of realizing a more uniform high luminance image in each of the 2D mode for the planar image and the 3D mode for the stereoscopic image.

Claims (10)

A stereoscopic image display device that selectively implements 2D mode and 3D mode, A main liquid crystal panel displaying a planar image; A parallax barrier liquid crystal panel that transmits light over the entire surface in the 2D mode and displays a parallax barrier pattern overlapping the planar image in the 3D mode; A backlight provided behind the main liquid crystal panel to supply light having a first brightness to the main liquid crystal panel in the 2D mode and to supply light having a second brightness higher than the first brightness to the main liquid crystal panel in the 3D mode. Including, The backlight includes a plurality of hot cathode fluorescent lamps arranged side by side on one rear surface of the main liquid crystal panel, The backlight implements the first and second luminances respectively through a linear dimming method for changing amplitude levels of input currents supplied to the plurality of hot cathode fluorescent lamps or a burst dimming method for changing on duty time of the input currents. Stereoscopic image display device. The method of claim 1, The parallax barrier pattern includes a barrier (a) having a first width and an opening (b) having a first spacing repeatedly arranged in a stripe pattern. 3. The method of claim 2, And the second luminance is (a + b) / b times or more of the first luminance. delete delete The method of claim 1, The backlight is, An optical member interposed between the plurality of hot cathode fluorescent lamps and the main liquid crystal panel; Reflective sheet providing a reflecting surface behind the plurality of hot cathode fluorescent lamps Stereoscopic display device further comprising. The method of claim 1, The parallax barrier liquid crystal panel is positioned in front of the main liquid crystal panel or between the main liquid crystal panel and the backlight. The method of claim 1, The main liquid crystal panel, First and second substrates bonded to each other with the first liquid crystal layer interposed therebetween and in which matrix-shaped pixels are defined; A pixel and a common electrode mounted on the pixels and opposed to each other with the first liquid crystal layer interposed therebetween; One-to-one thin film transistor connected to the pixel electrode Stereoscopic display device comprising a. 9. The method of claim 8, The Paralex barrier liquid crystal panel, Third and fourth substrates bonded to each other with the second liquid crystal layer interposed therebetween; A first electrode arranged on the inner surface of the third substrate in a stripe shape at a predetermined interval; A second electrode formed on an inner surface of the fourth substrate Stereoscopic image display device comprising a. As an image display method of a stereoscopic image display device including a main liquid crystal panel, a Paralex barrier liquid crystal panel, and a backlight, Displaying the 2D planar image by the main liquid crystal panel displaying a planar image, the parallax barrier liquid crystal panel transmitting light over the entire surface, and the backlight emitting light having a first luminance; The main liquid crystal panel displaying a planar image, the parallax barrier liquid crystal panel displaying a parallax barrier pattern, and the backlight emitting a second luminance higher than the first luminance to display a stereoscopic 3D image. Including, The backlight includes a plurality of hot cathode fluorescent lamps arranged side by side on one rear surface of the main liquid crystal panel, The backlight implements the first and second luminances respectively through a linear dimming method for changing amplitude levels of input currents supplied to the plurality of hot cathode fluorescent lamps or a burst dimming method for changing on duty time of the input currents. Image display method.

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