JP2012137696A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-view display image by determining an image of a content with noticeable Moire and crosstalk based on image feature information and suppressing the Moire and crosstalk by automatic control.SOLUTION: When an image determination unit 6 determines Moire and crosstalk based on image feature information that is transmitted simultaneously with a video signal transmitted to a liquid crystal display unit 5, the image determination unit 6 classifies luminance into three levels of dark, intermediate and bright, and determines the feature of the image by the number of pixels for every classification. When a bright subject with a large number of high-luminance pixels is present at a predetermined ratio or more, the image determination unit 6 determines that the Moire is apt to be noticeable and outputs determination information to a control voltage output unit 7. The control voltage output unit 7 applies a decreased control voltage to a switching liquid crystal unit 5a, thereby controlling the Moire of the liquid crystal display unit 5 to be unnoticeable.

Description

  The present invention relates to a liquid crystal display device using a parallax barrier method capable of 3D (three-dimensional) display without using special glasses.

  As an example, this type of conventional liquid crystal display device is capable of switching between 2D (2D) / 3D (3D) display in the liquid crystal display device, and can display different images from a plurality of viewpoints, A liquid crystal display panel and a liquid crystal display device capable of switching between a display method for displaying one image on a full screen.

  The left and right eyes of the human are viewing images viewed from different positions on the left and right, and the human brain recognizes the stereoscopic effect by the parallax between these two left and right images. Using this stereoscopic effect recognition principle, parallax is generated by causing the left and right eyes to recognize images viewed from different viewpoints, and stereoscopic liquid crystal display devices that perform 3D (three-dimensional) display have been developed.

  In order to perform 3D (three-dimensional) display, the left and right separate images are encoded on the display screen according to the polarization state and display timing in order to make the left and right eyes visually recognize images with different viewpoints, and the display image is confirmed. The left and right images are separated by a glasses-like polarization system worn by the person so that only the images that can be seen by the left and right eyes can be visually recognized.

  A liquid crystal display device in which a liquid crystal display panel is combined with a parallax barrier in which a light blocking area and a transmissive area are striped, and a 3D (three-dimensional) image can be obtained without a visual aid such as a glasses-like polarization system. There is a 3D liquid crystal display device that can be recognized.

  As described above, a conventional 3D liquid crystal display device that performs 3D (three-dimensional) display by combining a conventional liquid crystal display device with a parallax barrier in which a light blocking region and a transmissive region are striped, for example, It is disclosed in Patent Document 1. In Patent Document 1, a configuration using a patterned retardation plate as a parallax barrier is disclosed.

  In addition, in a conventional liquid crystal display device combined with a parallax barrier, a method of switching ON / OFF of the parallax barrier effect is combined with a switching liquid crystal unit or the like to electrically switch between 2D (2D) / 3D (3D) display. A conventional liquid crystal display device is disclosed in Patent Document 2. In the conventional liquid crystal display device disclosed in Patent Document 2, when the parallax barrier effect is enabled by turning on / off the switching liquid crystal unit, 3D (three-dimensional) display is performed and the parallax barrier effect is disabled. Then, 2D (two-dimensional) display can be performed. A display control configuration of such a conventional 3D liquid crystal display device will be briefly described with reference to FIG.

  FIG. 5 is a block diagram schematically showing a display control configuration example of a conventional 3D liquid crystal display device.

  In FIG. 5, a conventional 3D liquid crystal display device 100 has a display screen on which an L-side master camera 101, an R-side slave camera 102, and video signals from the L-side master camera 101 and the R-side slave camera 102 are input. LCDC 103 that controls the display of the display, and a 3D liquid crystal display unit (LCD) 104 of a display screen on which 3D display is performed based on image data from LCDC 103.

  Further, Patent Document 3 discloses a 3D liquid crystal display device that includes a liquid crystal parallax barrier on the surface of a liquid crystal panel and defines a voltage value applied to the liquid crystal parallax barrier that allows easy viewing of a 3D video display screen.

  FIG. 6 is a principle diagram of a liquid crystal parallax barrier of a conventional 3D liquid crystal display device disclosed in Patent Document 3.

  In FIG. 6, a parallax barrier 301 that is a light shielding barrier is disposed at a predetermined distance in front of the liquid crystal panel 300. In the parallax barrier 301, openings 301a... And light shielding portions 301b. The interval between the openings 301a... Is set corresponding to the arrangement of the left-eye pixels L and the right-eye pixels R. The parallax barrier 301 separates the left-eye image and the right-eye image into left and right, and the separated images enter the observer's left eye and right eye, respectively. As a result, the observer can observe a stereoscopic image through the opening 301a at an optimal position in front.

  When performing 3D video display, the voltage applied to the parallax barrier 301 is set to a voltage immediately before saturation. In this case, the voltage applied to the parallax barrier 301 is preferably a voltage that sets the transmittance of the light shielding portion 301b of the parallax barrier 301 to a transmittance of 2% to 25%. It is more preferable to set the voltage of 301b so that the transmittance is 3% or more and 10% or less. Thereby, it is possible to reduce moire generated on the display screen of 3D video.

JP-A-10-229567 JP-A-10-123461 JP 2004-294862 A

  In the above conventional parallax barrier methods disclosed in Patent Documents 1 and 2, a stripe image arranged in one dimension is viewed in principle from the opening slit of the parallax barrier arranged in one dimension. There is a problem that the image quality deteriorates due to the occurrence of black vertical stripes. For this reason, the deterioration of the image quality is uncomfortable for the observer, and the moire moves even if the viewpoint moves slightly, so that there is a problem that the depth or the feeling of popping out of the stereoscopic image is impaired. In such a conventional parallax barrier method, there is a problem that moire occurs. However, when a liquid crystal parallax barrier is used as the parallax barrier, the one where the contrast between the translucent part and the light shielding part is stronger Crosstalk (called a ghost, resulting in a double image) is reduced. For this reason, the transmittance of the light-shielding part of the liquid crystal parallax barrier is set to approximately 0%, and the contrast between the light-transmitting part and the light-shielding part is increased. On the other hand, when the contrast between the light-transmitting part and the light-shielding part is strong, moire occurs. There was also a problem that it became easier.

  The following problems occur in the 2D (two-dimensional) / 3D (three-dimensional) switching type liquid crystal display device disclosed in Patent Documents 1 and 2.

  That is, in the 2D (two-dimensional) / 3D (three-dimensional) switching type liquid crystal display device disclosed in Patent Documents 1 and 2, 2D (two-dimensional) / 3D (three-dimensional) display is performed only by switching ON / OFF of the switching liquid crystal unit. 3D (3D) under certain conditions (ON, OFF) when switching 3D (3D) display, even for video signals in which moire and crosstalk occur in 3D (3D) display The display is switched. For this reason, even when a video signal in which moire or crosstalk occurs is sent, the problem is that there is no function for determining moire or crosstalk for the video signal, and moire and crosstalk are reduced. There was a problem that could not be done. For this reason, when a video signal in which moiré or crosstalk occurs is displayed, there arises a problem that the observer is uncomfortable and eyes are tired.

  FIG. 7 is a diagram for explaining the relationship between the luminance histogram for each subject, moire, and crosstalk.

  As shown in FIG. 7, when the ratio of a dark subject with many low-luminance pixels on one screen is large, moire is not noticeable, and the ratio of a bright subject with many high-luminance pixels on one screen is large. Moire is conspicuous, and crosstalk is conspicuous in a high-contrast subject with a high ratio of the number of high and low luminance pixels in one screen and a small ratio of the number of medium luminance pixels.

  On the other hand, Patent Document 3 has a problem that it is impossible to transmit and determine a feature signal for each video signal transmitted to the 3D liquid crystal display device. For this reason, there has been a problem that it is impossible to control the voltage applied to the parallax barrier 301 of the liquid crystal suitable for the transmitted video signal. That is, as described above with reference to FIG. 7, moire and crosstalk may be conspicuous depending on the display content of the subject (subject content), but display control for reducing moire and crosstalk cannot be performed for each display content (subject content). There was a problem.

  The present invention solves the above-described conventional problems, and it is possible to obtain an easy-to-view display image by suppressing the moire and crosstalk by automatic control by performing image determination on content with conspicuous moire and crosstalk based on image feature information. An object is to provide a liquid crystal display device.

  The liquid crystal display device of the present invention is a liquid crystal display device that displays an image on a liquid crystal display unit based on a video signal from a video input device, a feature information acquisition unit that acquires image feature information from the video signal, and the feature information acquisition An image determination unit that can determine whether moire or crosstalk is output based on the image feature information acquired by the unit and output the determination information, and either the moire or crosstalk by controlling the liquid crystal display unit And a control voltage output unit that outputs a control voltage corresponding to the determination information to the liquid crystal display unit so that the above-described object is achieved.

  Preferably, the feature information acquisition unit in the liquid crystal display device of the present invention acquires the number of pixels for each luminance range of the luminance signal from the video signal as the image feature information.

  Further, preferably, the image feature information in the liquid crystal display device of the present invention is acquired for all the pixels of one screen or every predetermined number of pixels, and the luminance value for each pixel of the one screen is at least 3. The range of the luminance range of the stage is determined and counted sequentially, and the luminance ratio of the one screen is totalized.

  Further preferably, the image determination unit in the liquid crystal display device of the present invention determines either the moire or the crosstalk based on the image feature information and outputs the determination information.

  Further preferably, the image determination unit in the liquid crystal display device of the present invention extracts a value corresponding to the control voltage output to the liquid crystal display unit from the table based on the luminance ratio or the number of pixels by luminance. Output as judgment information.

  Still preferably, in a liquid crystal display device according to the present invention, the control voltage output unit is 2D (two-dimensional) / in accordance with determination information from the image determination unit so as to reduce either the moire or the crosstalk. The control voltage is output to a switching liquid crystal unit for 3D (three-dimensional) display switching.

  Further preferably, the output destination of the liquid crystal display unit to which the control voltage output unit in the liquid crystal display device of the present invention outputs the control voltage is a switching liquid crystal unit for 2D (2D) / 3D (3D) display switching It is.

  Further preferably, the switching liquid crystal unit in the liquid crystal display device of the present invention switches the effect of the parallax barrier in which the light blocking region and the transmissive region are formed in a stripe shape, thereby switching the 2D (two-dimensional). / 3D (3D) display is switched.

  Further preferably, the video input device in the liquid crystal display device of the present invention is any one of a receiving device, a 3D camera, and an information recording / reproducing device.

  Further preferably, in the liquid crystal display device of the present invention, the luminance values for each pixel of one screen are aggregated, and the number of pixels or luminance ratio by luminance range of at least three luminance ranges of high luminance, medium luminance and low luminance. When the image feature information is acquired and the number of pixels by luminance range of the high luminance or the ratio of the high luminance is equal to or greater than a predetermined value, the image determination unit determines that moire is conspicuous and outputs the control voltage The control information is output to the control unit, and the control voltage output unit applies the lower voltage to the switching liquid crystal unit so that the moire of the liquid crystal display unit is not noticeable.

  Further preferably, in the liquid crystal display device of the present invention, the luminance values for each pixel of one screen are aggregated, and the number of pixels or luminance ratio by luminance range of at least three luminance ranges of high luminance, medium luminance and low luminance. The image feature information is acquired, and the number of pixels of the low luminance and the high luminance or the luminance ratio of the low luminance and the high luminance is greater than a predetermined value, and the number of pixels of the medium luminance or the luminance ratio of the medium luminance Is less than a predetermined value, the image determination unit determines that the crosstalk is a conspicuous display image, and the control voltage output unit determines determination information so that the light blocking rate of the light blocking unit of the liquid crystal parallax barrier is high. The control voltage output unit increases the applied voltage to the switching liquid crystal unit and applies the control voltage so that the crosstalk of the liquid crystal display unit is not noticeable.

  Further preferably, in the liquid crystal display device of the present invention, in order to suppress the crosstalk, a voltage applied to the switching liquid crystal unit is increased in advance, and is set to a control voltage that stably reduces the crosstalk. The control is performed by reducing the control voltage based on the image feature information of the occurrence of moire.

  With the above configuration, the operation of the present invention will be described below.

  In the present invention, in the liquid crystal display device that displays an image on the liquid crystal display unit based on the video signal from the video input device, the feature information acquisition unit that acquires the image feature information from the video signal and the feature information reporting unit An image determination unit that can determine whether moire or crosstalk is output based on image feature information and output the determination information, and determination information that controls the liquid crystal display unit to reduce either moire or crosstalk And a control voltage output unit that outputs a control voltage according to the above to the liquid crystal display unit.

  Thus, either moire or crosstalk is determined in advance from the image feature information of the video signal indicating brightness or the like, and the voltage to the liquid crystal display unit is controlled according to the determination information indicating the determination result. As described above, it is possible to perform image determination on content with conspicuous moire and crosstalk based on image feature information, and to obtain a display image that is easy to view while suppressing moire and crosstalk by automatic control.

  As described above, according to the present invention, it is possible to perform image determination based on the image feature information for content with conspicuous moire and crosstalk, and to obtain a display image that is easy to view while suppressing moire and crosstalk by automatic control.

It is a block diagram which shows the principal part structural example of the liquid crystal display device in Embodiment 1 of this invention. It is a figure for demonstrating the histogram according to the brightness | luminance of a to-be-photographed object, and a moire correction. It is a figure for demonstrating the relationship between the histogram according to the brightness | luminance of a high contrast object, and crosstalk suppression processing. It is a table which shows the voltage setting value of 0-255. It is a block diagram which shows roughly the example of a display control structure of the conventional 3D liquid crystal display device. It is a principle figure of the liquid crystal parallax barrier of the conventional 3D liquid crystal display device currently disclosed by patent document 3. FIG. It is a figure for demonstrating the relationship between the histogram according to the brightness | luminance of a to-be-photographed object, moire, and crosstalk.

  Hereinafter, a liquid crystal display device according to a first embodiment of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration example of a main part of a liquid crystal display device according to Embodiment 1 of the present invention.

  In FIG. 1, a liquid crystal display device 1 according to the first embodiment includes an L (left) master camera 2 that captures a subject and obtains a video signal, and an R (right) slave camera that captures a subject and obtains a video signal. 3 and the LCDC 4 that receives the video signals from the L-side master camera 2 and the R-side slave camera 3 and performs predetermined signal processing to obtain a color image signal and control display of the display screen. The liquid crystal display unit (LCD) 5 as a display screen unit for performing 2D or 3D display based on the color image signal of the video signal and the video signal input to the LCDC 4 for display are obtained from the video signal. An image determination unit 6 that determines moire and crosstalk based on image feature information indicating a brightness ratio and outputs the determination information, and a liquid crystal display based on the determination information from the image determination unit 6 5 has a control voltage output unit 7 (SWLCD / voltage DAC) that outputs a control voltage (applied voltage) to the switching liquid crystal unit 5a, and controls the switching liquid crystal unit 5a of the liquid crystal display unit 5 from the determined determination information. To reduce moiré and crosstalk.

  In the L-side master camera 2 and the R-side slave camera 3, the feature information acquisition units 2 a and 3 a configured by the respective CPUs (control units) can detect the pixel brightness from the video signal to be transmitted to the LCDC 4 on the camera side. Image feature information indicating the ratio is acquired for each screen (one frame in the case of a moving image). That is, each of the feature information acquisition units 2a and 3a sequentially determines the luminance value for each pixel on one screen and belongs to three luminance ranges of low luminance, medium luminance, and high luminance, and sequentially counts them. The image feature information is obtained by summing up the luminance ratios of low luminance, medium luminance, and high luminance with respect to all pixels in the screen. The feature information acquisition units 2a and 3a respectively acquire the number of pixels for each luminance signal from the video signal as image feature information.

  The image determination unit 6 obtains the moire and crosstalk determination information of the transmitted video signal from the table based on the luminance ratio (or the number of pixels for each luminance) of low luminance, medium luminance, and high luminance as the image feature information. Then, a value corresponding to the applied voltage (control voltage) to the switching liquid crystal unit 5a is taken out and output as determination information.

  Based on the determination information from the image determination unit 6, the control voltage output unit 7 reduces either moire or crosstalk displayed on the liquid crystal display unit 5 that is a 2D / 3D switching type liquid crystal display unit. An output voltage (control voltage) applied to the switching liquid crystal unit 5a of the liquid crystal display unit 5 is controlled.

  The switching liquid crystal unit 5a can switch ON / OFF the effect of the parallax barrier in which the light blocking region and the transmissive region are formed in a stripe shape. The switching liquid crystal unit 5a can electrically switch between 2D (2D) / 3D (3D) display. When the parallax barrier effect is enabled by turning on / off the switching liquid crystal unit 5a, 3D (three-dimensional) display is performed, and when the parallax barrier effect is disabled, 2D (two-dimensional) display can be performed.

  With the above configuration, as an example of image feature information of the video signal displayed on the liquid crystal display unit 5, the camera side obtains the number of pixels (luminance ratio) by luminance from the luminance signal in the video signal, and based on this luminance ratio. In addition, data from which the image determination unit 6 predicts the occurrence of moire or crosstalk in advance is extracted from the table, and is output to the control voltage output unit 7 as determination information corresponding to the luminance ratio. In the control voltage output unit 7, the voltage applied to the switching liquid crystal unit 5 a for 2D / 3D switching of the liquid crystal display unit 5 is applied to the liquid crystal display unit 5 according to the determination information that is data from the table. Control to perform reduced display.

  FIG. 2 is a diagram for explaining a histogram and moire correction for each luminance of a subject.

  As shown in FIG. 2, when the image determination unit 6 determines moire and crosstalk based on image feature information transmitted simultaneously with the video signal transmitted to the liquid crystal display unit 5, as shown in FIG. The brightness is classified into three levels of dark, medium, and light, and the image characteristics are determined by the number of pixels for each classification. In FIG. 2, when a bright subject with a large number of high-luminance pixels has a predetermined ratio or more, the image determination unit 6 determines that moire is conspicuous, and outputs determination information to the control voltage output unit 7. 7 is applied by lowering the applied voltage to the switching liquid crystal unit 5a so that the moire of the liquid crystal display unit 5 is not noticeable. At this time, the light blocking rate of the light blocking portion of the parallax barrier is lowered.

  In this way, when the ratio of bright subjects with a large number of high-luminance pixels is larger than a predetermined ratio, the image determination unit 6 determines that moire is conspicuous and outputs determination information to the control voltage output unit 7, Control is performed so that the moire of the liquid crystal display unit 5 is not noticeable by the control voltage output unit 7 applying a lower voltage to the switching liquid crystal unit 5a.

  FIG. 3 is a diagram for explaining the relationship between a histogram of a subject with high contrast and crosstalk suppression processing.

  As shown in FIG. 3, the number of pixels of a dark subject and a bright subject in a display image is a predetermined ratio when there are a large number of low and high luminance pixels and a small number of medium luminance pixels in one screen. If the number is larger than that, it is determined that the contrast of the subject is high. In this case, the luminance values for each pixel of one screen are aggregated, and image feature information is acquired as a luminance ratio in a three-level luminance range of high luminance, medium luminance, and low luminance, and the number of pixels of low luminance and high luminance is obtained. Is larger than the predetermined number and the number of medium-luminance pixels is smaller than the predetermined number, the image determining unit 6 determines that the display image is prominent in crosstalk, and the light blocking rate of the light blocking unit of the liquid crystal parallax barrier is high. The determination information is output to the control voltage output unit 7 so that the control voltage output unit 7 increases the applied voltage to the switching liquid crystal unit 5a and applies the 2D (two-dimensional) / 3D (three-dimensional) switching type liquid crystal. Control is performed so that the crosstalk of the display unit 5 is not noticeable. At this time, the light shielding rate of the light shielding part of the parallax barrier is further increased.

  As described above, the determination based on the image feature information transmitted to the image determination unit 6 at the same time as the video signal transmitted to the liquid crystal display unit 5 is performed by a combination of the number of pixels for each luminance range (or luminance ratio) classified into three stages. ). A combination (or luminance ratio) of the number of pixels by luminance that is determined in advance along each luminance ratio (or the number of pixels by luminance range) and 2D (2 of the liquid crystal display unit 5 associated therewith (2) It is possible to adjust the voltage value to an appropriate voltage value from the voltage applied to the switching liquid crystal unit 5a for (dimensional) / 3D (three-dimensional) switching, and to make the display easy to see with reduced moire and crosstalk.

  As such a voltage control method for the switching liquid crystal unit 5a, the control voltage output unit 7 switches the switching liquid crystal unit for 2D (2D) / 3D (3D) display switching in accordance with the determination information from the image determination unit 6. The control voltage to be output to 5a is applied to the switching liquid crystal unit 5a of the 2D (two-dimensional) / 3D (three-dimensional) switching type liquid crystal display unit 5 in accordance with the luminance gradation values 0 to 255. (About 7V) is assigned to 0 to 255 stages. If the applied voltage is 2 V or less, it will not be visible in 3D. Therefore, the voltage applied to the switching liquid crystal unit 5a is controlled to a voltage range of about 2V to 7V.

  As described above, the range of the applied voltage MIN (about 2V) to MAX (about 7V) is made to correspond to the voltage value in 255 steps, but the ratio of the number of high-luminance pixels in one screen is larger than the predetermined ratio. In this case, the applied voltage is lowered to lower the light shielding rate of the light shielding part of the liquid crystal parallax barrier, thereby suppressing moire. Also, when the number of low and high luminance pixels is large and the number of medium luminance pixels is small in one screen, the applied voltage is increased to increase the light blocking rate of the light blocking portion of the liquid crystal parallax barrier, thereby reducing crosstalk. If the light shielding rate of the light shielding part of the liquid crystal parallax barrier is high, moire tends to occur. This image determination is performed for each screen (every frame or frame thinning) in the case of a moving image. The brightness of the entire screen is divided into three levels (low luminance, medium luminance, and high luminance), and the voltage applied to the switching liquid crystal unit 5a is set according to the ratio and tabulated. In this table, 0 to 255 gradation data (voltage range of about 2V to 7V) corresponding to the luminance ratio of low luminance, medium luminance and high luminance is included. On the other hand, what is the range of the luminance ratio of low luminance, medium luminance, and high luminance corresponding to 0 to 255 gradation data (voltage range of about 2V to 7V) is obtained from experimental values. Here, the luminance is divided into three levels, but the present invention is not limited to this, and may be four levels or five levels.

  With the above configuration, first, the number of pixels for each luminance range in the histogram is read as image feature information as the image feature information of the video signal, and 3D (from the voltage setting range is determined based on the number of pixels for each luminance range (or luminance ratio). It is assigned to a voltage corresponding to a luminance gradation value in which moire and crosstalk are reduced within a voltage range that can be viewed in three dimensions.

  Next, based on the image feature information (number of pixels or luminance ratio for each luminance range) obtained from the video signal to be sent to the liquid crystal display unit 5, the applied voltage corresponding to the assigned luminance gradation value is 2D (2 By applying to the switching liquid crystal unit 5a of the (dimensional) / 3D (three-dimensional) switching type liquid crystal display unit 5, it is possible to display a display image without eye fatigue with reduced moire and crosstalk.

  The crosstalk at the time of 3D (3D) display of the 2D (2D) / 3D (3D) switching type liquid crystal display unit 5 is the voltage applied to the 2D (2D) / 3D (3D) switching liquid crystal unit 5a. Since it can be reduced in the raised state, the control is set to an applied voltage at which crosstalk is stably reduced, and when an image feature signal of moiré is sent, the applied voltage is lowered. The liquid crystal display unit 5 can be controlled more efficiently.

  As described above, in the display control method according to the first embodiment shown in FIG. 1, the voltage applied to the switching liquid crystal unit 5a for switching 2D (two-dimensional) / 3D (three-dimensional) of the liquid crystal display unit 5 is controlled. Since it is possible to reduce moire and crosstalk, image feature information obtained from the video signal is transmitted to the image determination unit 6 simultaneously with the video signal transmitted to the liquid crystal display unit 5, and the image determination unit 6 , The moire and the crosstalk are determined from the image feature information, and the control voltage output unit 7 controls the applied voltage to the switching liquid crystal unit 5a based on the determination result (determination information) to display 3D (three-dimensional) display. Sometimes it is possible to obtain an eye-free image with reduced moire and crosstalk.

  When performing voltage control of the switching liquid crystal unit 5a for 2D (2D) / 3D (3D) switching for each video signal sent, image feature information (image feature signal) is acquired from the video signal each time. Then, the image determination unit 6 determines moire and crosstalk, and the control voltage output unit 7 determines the voltage applied to the switching liquid crystal unit 5a for 2D (two-dimensional) / 3D (three-dimensional) switching of the liquid crystal display unit 5. decide.

  From the experimental results in a voltage range (about 2V to about 7V) that can be stereoscopically viewed in 3D (3V), if the applied voltage to the switching liquid crystal unit 5a is increased, crosstalk is reduced, and if the applied voltage is reduced, moire is reduced. Is possible.

  As described above, according to the first embodiment, as shown in FIG. 2, the image determination unit 6 performs moire and crosstalk based on the image feature information transmitted simultaneously with the video signal transmitted to the liquid crystal display unit 5. In the determination, the luminance is classified into three levels of dark, medium, and light, and the feature of the image is determined by the number of pixels for each classification. When a bright subject with a large number of high-luminance pixels has a predetermined ratio or more, the image determination unit 6 determines that moire is conspicuous and outputs determination information to the control voltage output unit 7. The control voltage output unit 7 switches the switching liquid crystal. Control is performed so that the moire of the liquid crystal display unit 5 is not noticeable by applying a lower voltage to the unit 5a. In addition, as shown in FIG. 3, when the number of high luminance pixels and the number of low luminance pixels are equal to or higher than a predetermined ratio and the number of medium luminance pixels is equal to or lower than the predetermined value, the image determination unit 6 determines and controls that crosstalk is easily noticeable The determination information is output to the voltage output unit 7, and the control voltage output unit 7 increases the applied voltage to the switching liquid crystal unit 5a and applies the control voltage so that the crosstalk of the liquid crystal display unit 5 is not noticeable.

  As described above, when a video signal in which moiré and crosstalk are generated is sent, the number of pixels by luminance is counted from the luminance signal, which is a characteristic of the sent video signal, and the state of the video signal and moiré are determined. Alternatively, it is determined whether or not the image is crosstalk and the voltage applied to the switching liquid crystal unit 5a for switching 2D (2D) / 3D (3D) can be controlled in accordance with the transmitted video signal. Is possible. As a result, it is possible to obtain an eye-free image with reduced moire and crosstalk.

  In the first embodiment, the 3D cameras of the L-side master camera 2 and the R-side slave camera 3 are used as the video input device. However, the present invention is not limited to this, and the video input device is a receiving device such as a television or a mobile phone device. Or an information recording / reproducing apparatus that obtains video information from a DVD or the like.

  In the first embodiment, the feature information acquisition units 2a and 3a respectively acquire the number of pixels for each luminance range of the luminance signal from the video signal as the image feature information, and the image feature information is stored in all the pixels for each screen. The brightness value obtained for each pixel of one screen is determined as to which of the three levels of brightness range it belongs and sequentially counted, and is counted as the brightness ratio of one screen. The image feature information is acquired for every predetermined number of pixels of every pixel in one screen, and the luminance value for each pixel in one screen is judged to belong to which range of the three stages of luminance ranges. It may be counted and tabulated as a luminance ratio of one screen.

  As mentioned above, although this invention has been illustrated using preferable Embodiment 1 of this invention, this invention should not be limited and limited to this Embodiment 1. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range from the description of the specific preferred embodiment 1 of the present invention based on the description of the present invention and the common general technical knowledge. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  According to the present invention, in the field of a parallax barrier liquid crystal display device capable of 3D (three-dimensional) display without using special glasses, according to the present invention, content with conspicuous moire and crosstalk is displayed as image feature information. It is possible to obtain an easy-to-view display image by suppressing the moire and crosstalk by automatic control based on the image determination.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 L (left) side master camera (image input device)
2a, 3a Feature information acquisition unit 3 R (right) side slave camera (image input device)
4 LCDC (Display Control Unit)
5 Liquid crystal display (LCD)
5a Switching liquid crystal unit 6 Image determination unit 7 Control voltage output unit

Claims (12)

In a liquid crystal display device that displays an image on a liquid crystal display unit based on a video signal from a video input device,
A feature information acquisition unit for acquiring image feature information from the video signal;
An image determination unit capable of determining one of moire and crosstalk based on the image feature information acquired by the feature information collecting unit and outputting determination information;
And a control voltage output unit that outputs a control voltage corresponding to the determination information to the liquid crystal display unit so as to control the liquid crystal display unit to reduce either the moire or the crosstalk. The liquid crystal display device according to claim 1.
The feature information acquisition unit is a liquid crystal display device that acquires the number of pixels for each luminance range of the luminance signal from the video signal as the image feature information. The liquid crystal display device according to claim 1 or 2,
The image feature information is acquired for all the pixels in one screen or every predetermined number of pixels, and it is determined to which of the brightness ranges of at least three levels the luminance value for each pixel of the one screen belongs. A liquid crystal display device that judges and sequentially counts and tabulates the luminance ratio of the one screen. The liquid crystal display device according to claim 1.
The image determination unit is a liquid crystal display device that determines one of the moire and the crosstalk based on the image feature information and outputs the determination information. The liquid crystal display device according to claim 2 or 3,
The said image determination part is a liquid crystal display device which takes out the value corresponding to the control voltage output to the said liquid crystal display part from a table based on the said brightness | luminance ratio or the said pixel number according to the brightness | luminance, and outputs it as said determination information. The liquid crystal display device according to claim 1.
The control voltage output unit is a switching liquid crystal for 2D (2D) / 3D (3D) display switching in accordance with determination information from the image determination unit so as to reduce either the moire or the crosstalk. A liquid crystal display device that outputs the control voltage to the unit. The liquid crystal display device according to claim 1.
An output destination of the liquid crystal display unit from which the control voltage output unit outputs the control voltage is a liquid crystal display device which is a switching liquid crystal unit for 2D (2D) / 3D (3D) display switching. The liquid crystal display device according to claim 6 or 7,
The switching liquid crystal unit switches the 2D (two-dimensional) / 3D (three-dimensional) display by switching on / off the effect of the parallax barrier in which the light blocking region and the transmissive region are striped. Liquid crystal display device. The liquid crystal display device according to claim 1.
The video input device is a liquid crystal display device which is one of a receiving device, a 3D camera, and an information recording / reproducing device. The liquid crystal display device according to claim 6 or 7,
The luminance values for each pixel of one screen are aggregated, and the image feature information is acquired as the number of pixels or luminance ratio of at least three luminance ranges of high luminance, medium luminance and low luminance, and the high luminance When the number of pixels by luminance range or the high luminance ratio is equal to or greater than a predetermined value, the image determination unit determines that moire is conspicuous and outputs determination information to the control voltage output unit, and the control voltage output unit The liquid crystal display device is controlled so that the moiré of the liquid crystal display unit is not noticeable by lowering the applied voltage to the switching liquid crystal unit. The liquid crystal display device according to claim 6 or 7,
The luminance values for each pixel of one screen are aggregated, and the image feature information is acquired as the number of pixels or the luminance ratio in at least three luminance ranges of high luminance, medium luminance and low luminance, and the low luminance and Crosstalk is conspicuous when the number of the high luminance pixels or the luminance ratio between the low luminance and the high luminance is larger than a predetermined value and the number of the medium luminance pixels or the luminance ratio of the medium luminance is smaller than the predetermined value. The image determination unit determines that the image is a display image, and outputs determination information to the control voltage output unit. The control voltage output unit applies a lower applied voltage to the switching liquid crystal unit to A liquid crystal display device that is controlled so that crosstalk is less noticeable. The liquid crystal display device according to claim 6 or 7,
In order to suppress the crosstalk, the voltage applied to the switching liquid crystal unit is increased in advance and set to a control voltage at which the crosstalk is stably reduced, and the control voltage is reduced according to image feature information of occurrence of moire. A liquid crystal display device configured to perform control.