JP2014068256A - Display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which suppresses crosstalk between a left eye image and a right eye image or flicker caused when the brightness of display means is adjusted, and a television receiver equipped with the display device.SOLUTION: A system control part 12 of the TV receiver receives an instruction to change the brightness of display of a liquid crystal panel 15 by a user and increases the luminance of a backlight part 19 by PWM control with a backlight control part 18 when receiving an instruction to increase the brightness of the display. At the same time, the system control part 12 adjusts (corrects) a parallax so as to decrease it by a parallax adjustment part 16 and gives an obtained correction value to a panel control part 14 to drive the liquid crystal panel 15.

Description

  The present invention relates to a display device that displays stereoscopic video based on a left-eye video signal and a right-eye video signal, and a television receiver including the display device.

In recent years, various types of video display devices have been diversified, and a 3D display function for displaying a stereoscopic video based on a left-eye video signal and a right-eye video signal has been installed as a general function.
In a 3D image display device having a 3D display function, one frame period is divided into two, and two images having a parallax are alternately switched and displayed as a left-eye image and a right-eye image. “Parallax” is a parameter for producing a stereoscopic effect, and is expressed by, for example, a pixel shift amount representing the same point between the left-eye video and the right-eye video.
In this 3D video display device, shutter glasses that are opened and closed in synchronization with display switching are used. The shutter glasses are controlled so that the left-eye portion is opened during the display period of the left-eye image, and the right-eye portion is opened during the display period of the right-eye image. A user can view stereoscopic images by wearing such shutter glasses to realize stereoscopic viewing.

  However, when the 3D image display device as described above includes a liquid crystal display panel, interference occurs between consecutive images due to lack of liquid crystal response speed in the liquid crystal display panel, response in the shutter glasses (response delay), etc. Crosstalk) occurs. For example, part of the left-eye video leaks to the right-eye video and part of the right-eye video leaks to the left-eye video, thereby causing crosstalk.

  In the 3D video display device, the left and right eyes only feel an afterimage while the other is watching the video, so the brightness felt by the user is reduced. Therefore, in a 3D video display device that can adjust the brightness of the backlight, the user may increase the brightness of the backlight. In this case, since the response range of the liquid crystal is widened and the luminance response takes time, there is a problem that crosstalk is deteriorated. For this reason, at present, the backlight luminance is suppressed to a level at which crosstalk is suppressed to some extent.

  Patent Document 1 is configured to change at least one of the timing (start time) and duty (length) of the backlight lighting period based on the amount of parallax between the left-eye video and the right-eye video, and the contrast. An invention of a video display device is disclosed. According to this video display device, the backlight lighting period is optimized in accordance with the video content and the usage situation of the user, for example, when it is desired to reduce the crosstalk even if the luminance is somewhat reduced, and the crosstalk between the continuous videos. Can be suppressed.

JP 2010-286555 A

  In the case of Patent Document 1, since the backlight lighting period is controlled by the contrast and the amount of parallax, there is a problem that the luminance may change to the extent that flicker occurs depending on the level of the video signal.

  The present invention has been made in view of such circumstances, and suppresses occurrence of crosstalk and flicker between the left-eye video and the right-eye video when the brightness of the display means is adjusted. It is an object of the present invention to provide a display device and a television receiver including the display device.

  The display device according to the present invention adjusts the parallax between the video based on the left-eye video signal and the video based on the right-eye video signal, and display means for displaying a stereoscopic video based on the left-eye video signal and the right-eye video signal. A display device including a parallax adjusting unit includes a brightness adjusting unit that adjusts the brightness of the display unit, and the parallax adjusting unit adjusts the parallax based on the brightness adjusted by the brightness adjusting unit. It is comprised by these.

  The display device according to the present invention includes a backlight that emits light to the display means, and the brightness adjusting means is configured to adjust the luminance of the backlight.

  The display device according to the present invention includes enhancement processing means for performing brightness enhancement processing based on transition of an input video signal, the enhancement processing means based on the brightness adjusted by the brightness adjustment means, The enhancement processing is configured to be performed.

  The display device according to the present invention includes a left-eye shutter that adjusts the amount of light transmitted to the left eye, a pair of glasses having a right-eye shutter that adjusts the amount of light transmitted to the right eye, the left-eye video signal, and the right-eye image. Shutter opening / closing means for controlling opening / closing of the left eye shutter and the right eye shutter based on a signal, the shutter opening / closing means controlling the opening / closing based on the brightness adjusted by the brightness adjusting means. It is comprised so that it may do.

  A television receiver according to the present invention includes the above-described display device and a receiving unit that receives a television broadcast, and displays an image on the display device based on the television broadcast received by the receiving unit. It is comprised as follows.

  When the brightness of the display means is increased, it takes time for the luminance response, but in the present invention, the occurrence of crosstalk can be suppressed by reducing the parallax. In addition, when the brightness of the display means is reduced, the luminance response time is shortened, so that the occurrence of crosstalk is suppressed, and by increasing the parallax, a stereoscopic effect is added to the extent that the darkness is reduced, making it easier to view the video. can do.

  In the present invention, when the brightness of the backlight is increased to increase the brightness of the display means, the occurrence of crosstalk can be suppressed by reducing the parallax.

  In the present invention, when the brightness of the display means is increased, the occurrence of crosstalk can be further suppressed by reducing the parallax and increasing the quick shoot.

  In the present invention, when the brightness of the display means is increased, the occurrence of crosstalk can be further suppressed by reducing the parallax and adjusting the opening and closing of the glasses.

  In the present invention, since the above-described display device is provided, occurrence of crosstalk is suppressed when viewing 3D video based on television broadcasting.

  According to the display device of the present invention, since the parallax adjustment unit automatically adjusts the parallax based on the brightness of the display unit adjusted by the brightness adjustment unit, for example, when the brightness of the display unit is increased, the parallax is adjusted. The occurrence of crosstalk can be suppressed by reducing.

It is a perspective view which shows the TV receiver which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of TV receiver which concerns on Embodiment 1 of this invention. It is a flowchart which shows the process sequence of the brightness change by the system control part which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the GUI screen of a brightness setting. It is a schematic diagram showing a state in which the brightness is set as a standard and a 3D image is viewed without using glasses. It is a schematic diagram which shows the state which watched and viewed 3D image | video when setting to make a display bright. It is a schematic diagram which shows the state which watched and viewed 3D image | video when it set to the display darkening. It is a flowchart which shows the process sequence of the brightness change by the system control part which concerns on Embodiment 2 of this invention.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a TV receiver 1 according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of the TV receiver 1.
The TV receiver 1 includes a display device 24 that includes a liquid crystal display panel (hereinafter referred to as a liquid crystal panel) 15 that has a horizontally long rectangular parallelepiped shape and is arranged in a vertical posture, a frame 25 that covers a peripheral portion of the display device 24, and an antenna. A tuner (reception unit) 2 that receives broadcast waves from (not shown) and a stand 26 that supports the display device 24 are provided.

  The display device 24 includes a liquid crystal panel 15 and a backlight unit 19 having a chassis, an LED substrate, a reflection sheet, a light guide plate, an optical sheet, a light shielding holder, and a panel cover. A board on which the above-described tuner 2 and the like are mounted is provided on the outer surface of the bottom plate of the chassis.

  As shown in FIG. 2, the TV receiver 1 includes a tuner 2, an external input unit 3, a PC input unit 4, an HDMI (registered trademark) input unit 5, an input signal switching unit 6, an AD conversion unit 7, and an AD conversion unit. 8, 3DYC separation unit 9, color space conversion unit 10, 2D / 3D determination unit 11, system control unit 12, gamma correction unit 13, panel control unit 14, liquid crystal panel 15, parallax adjustment unit 16, quick shoot control unit 17 , The backlight control unit 18, the backlight unit 19, the glasses control unit 20, and the glasses 21.

The video signal received by the tuner 2, the video signal input from the external input unit 3, or the video signal input from the PC input unit 4 is supplied to the input signal switching unit 6.
The input signal switching unit 6 selects one of the video signals described above based on a user instruction.
When receiving the program information (electronic program guide), EDID (Extended Display Identification Data), etc., the HDMI input unit 5 extracts the information and gives it to the color space conversion unit 10.

The input signal switching unit 6 supplies a composite analog signal to the AD conversion unit 7 when a composite signal such as a video input is selected, and applies a component analog signal to the AD conversion unit 8 when a component signal such as YCBCR / RGB is selected.
The AD converters 7 and 8 convert analog signals into digital signals.
The AD conversion unit 7 gives the converted digital signal to the 3DYC separation unit 9. The AD conversion unit 8 gives the converted digital signal to the color space conversion unit 10.

The 3DYC separation unit 9 separates the luminance signal (Y) and the color signal (C) by comparing the signal with the upper and lower lines and the signal with the line at the same position in the previous and subsequent frames. To do.
The color space conversion unit 10 converts the YCbCr signal separated by the 3DYC separation unit 9 into an RGB signal suitable for general display.
The color space conversion unit 10 gives a signal obtained by color space conversion to the 2D / 3D determination unit 11 and the gamma correction unit 13.
The 2D / 3D determination unit 11 corresponds to either a 2D video or a 3D video signal input to the tuner 2, the external input unit 3, or the PC input unit 4 according to EDID or the like input to the HDMI input unit 5. It is determined whether the signal is a signal, and the determination result is given to the system control unit 12.

  The gamma correction unit 13 corrects the RGB signal value (gradation signal value) given by the color space conversion unit 10 in accordance with the overall display brightness and color saturation of the liquid crystal panel 15, The corrected signal is given to the panel control unit 14.

The panel control unit 14 drives the liquid crystal panel 15 to display a video based on the video signal given by the gamma correction unit 13.
The panel control unit 14 converts a 3D image (side-by-side method, top-and-bottom method, or frame sequential method) including a frame image including both a right-eye image and a left-eye image into a right-eye frame including only the right-eye image. The image is converted into a three-dimensional image including a left-eye frame image including only the left-eye image.
For example, when the video signal before conversion is a side-by-side video signal, (1) the right half of each frame image constituting the three-dimensional image before conversion is expanded by double in the horizontal direction. (2) A frame image for the left eye is generated by magnifying the left half of each frame image constituting the three-dimensional image before conversion twice in the horizontal direction, and (3) the generated frame image for the right eye And left-eye frame video are output alternately.
In addition, the panel control unit 14 changes the panel driving speed and sets the driving of the glasses 21. When performing the three-dimensional display, the panel control unit 14 notifies the glasses control unit 20 of the display timing of the left-eye video and the right-eye video, which are set by driving the glasses 21.

The eyeglasses 21 are active shutter type eyeglasses, which have shutters such as liquid crystal shutters on the left and right lenses, and are alternately left and right in synchronization with the timing at which the liquid crystal panel 15 alternately displays the left-eye video and the right-eye video. Open and close the shutter of the lens.
The glasses controller 20 controls the opening / closing of the shutter of the glasses 21 described above in synchronization with the display timing received from the panel controller 14.

  The parallax adjustment unit 16 calculates an adjustment amount (correction amount) of parallax between the left-eye video and the right-eye video. The parallax adjustment unit 16 changes the parallax between the videos by shifting the synthesis position of the left-eye video and the right-eye video, for example. The shift of the composition position refers to a shift in the horizontal direction or the vertical direction in units of pixels or the entire video. Alternatively, when depth information is given to the video signal, the parallax adjustment unit 16 may adjust the stereoscopic information to adjust the stereoscopic distance to change the parallax.

  The backlight control unit 18 controls the brightness of the backlight unit 19 by performing duty control by PWM (pulse width modulation) on the LEDs of the backlight unit 19, and the brightness of the image displayed on the liquid crystal panel 15. To control.

  The quick shoot control unit 17 controls quick shoot driving (also referred to as overshoot driving or overdrive driving). As quick shoot control, the data of the previous and subsequent frames based on the input video signal are compared for each pixel to obtain inter-frame difference information, and brightness enhancement processing such as edge enhancement is performed according to the obtained inter-frame difference information. What to apply is mentioned. Further, when the liquid crystal panel 15 is driven so as to increase the transmittance toward the target luminance, the liquid crystal panel 15 is driven with a driving amount corresponding to the transmittance equal to or higher than the transmittance necessary for the target luminance, that is, higher than the target voltage. There is a quick shoot control in which a driving voltage is applied to the liquid crystal panel 15. Hereinafter, the case where the latter quick shoot control is performed will be described.

  The system control unit 12 is a computer in which a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a nonvolatile memory, and an input / output interface are connected by a shared bus. The system control unit 12 controls the operation of each unit described above and grasps the processing state of each unit.

Hereinafter, the parallax adjustment processing of the TV receiver 1 according to Embodiment 1 will be described.
FIG. 3 is a flowchart showing a procedure for changing the brightness by the system control unit 12.
The system control unit 12 determines whether or not an instruction to change the display brightness of the liquid crystal panel 15 has been received by the user (S1). For example, a remote operation device (not shown) is provided with a “brightness change” button for accepting a change in display brightness, and it is determined whether or not the user has pressed the “brightness change” button. . When it is determined that the instruction is not received (S1: NO), the system control unit 12 repeats the determination process.

  When the system control unit 12 determines that the instruction has been received (S1: YES), that is, when it is determined that the user has pressed the “brightness change” button, a brightness setting GUI (graphical user interface) screen Is displayed on the liquid crystal panel 15, and it is determined whether or not a setting to brighten from the present time is accepted by the user's operation of the remote control device or the like, that is, whether or not an instruction to brighten is accepted (S2).

  FIG. 4 is a diagram illustrating an example of a GUI screen for setting brightness. The brightness is expressed in five levels from “1” to “5”, “3” is the standard, and “5” is the brightest. The duty ratio of the above-described PWM control is set corresponding to each stage of brightness. The brightness level is not limited to 5 levels.

If the system control unit 12 determines that an instruction to brighten has been received (S2: YES), for example, if an instruction to change “3” to “4” is received, the duty ratio of PWM control is set to “4”. The value is changed to a corresponding value, and the backlight control unit 18 performs PWM control with the changed duty ratio to increase the luminance of the backlight unit 19 (S3).
At the same time, the system control unit 12 performs adjustment (correction) to reduce the parallax by the parallax adjustment unit 16, and gives the obtained correction value to the panel control unit 14 (S4). When the parallax adjustment unit 16 is configured to calculate the shift amount of the composite position of the left-eye video and the right-eye video, the panel control unit 14 superimposes the left-eye video and the right-eye video based on the shift amount. The liquid crystal panel 15 is driven by controlling so that the shift (parallax) between both of the composite video is reduced.

FIG. 5 is a schematic diagram showing a state in which the brightness is set to the standard and the 3D image is viewed without using the glasses 21, and FIG. 6 is a state in which the 3D image is viewed when the display is set to be brightened. It is a schematic diagram which shows.
By comparing FIG. 5 with FIG. 6, it can be seen that in FIG. 6, the interval between the same pixels of the left-eye video and the right-eye video is narrow, and the parallax is narrow.
The parallax adjustment unit 16 adjusts the three-dimensional distance (depth, depth) based on the depth information, and the system control unit 12 sends the left-eye video signal and the right-eye video signal based on this to the liquid crystal panel 15 by the panel control unit 14. You may make it output.

  At the same time, the system control unit 12 calculates a drive voltage higher than the target voltage corresponding to the target brightness by the quick shoot control unit 17 and applies the calculated drive voltage to the liquid crystal panel 15 by the panel control unit 14. That is, the quick shoot is strengthened (S5), and the process is terminated.

  When it is determined in step S2 that the instruction to brighten has not been accepted, that is, the instruction to darken has been accepted (S2: NO), for example, the system control unit 12 accepts an instruction to change the current “3” to “2”. In this case, the duty ratio of the PWM control is changed to a value corresponding to “2”, the PWM control is performed by the backlight control unit 18 with the changed duty ratio, and the luminance of the backlight unit 19 is lowered (S6).

  At the same time, the system control unit 12 corrects the parallax to be increased by the parallax adjustment unit 16, and gives the obtained correction value to the panel control unit 14 (S7). When the parallax adjustment unit 16 calculates the shift amount of the composite position of the left-eye video and the right-eye video, the panel control unit 14 shifts both of the composite video obtained by superimposing the left-eye video and the right-eye video based on the shift amount. Control is performed so that (parallax) increases. Alternatively, when the parallax adjustment unit 16 adjusts the depth information, the system control unit 12 outputs the left-eye video signal and the right-eye video signal based on the depth information to the liquid crystal panel 15 by the panel control unit 14.

FIG. 7 is a schematic diagram showing a state in which a 3D image is viewed when the display is set to be darkened.
By comparing FIG. 5 with FIG. 7, it can be seen that in FIG. 7, the interval between the same pixels in the left-eye video and the right-eye video is wide, and the parallax is wide.

  At the same time, the system control unit 12 calculates a drive voltage lower than the target voltage corresponding to the target brightness by the quick shoot control unit 17 and applies the calculated drive voltage to the liquid crystal panel 15 by the panel control unit 14. That is, the quick shoot is weakened (S8), and the process ends.

  Since the present embodiment is configured as described above, when the brightness of the liquid crystal panel 15 is increased, it takes time for the luminance response, but at the same time, the parallax is reduced and the quick shoot is increased. The occurrence of talk can be suppressed. In addition, when the brightness of the liquid crystal panel 15 is reduced, the luminance response time is shortened, so that the occurrence of crosstalk is suppressed, and at the same time, by increasing the parallax, a stereoscopic effect is imparted as the darkness is reduced. This makes it easier to see the video. At this time, the quick shoot can be weakened.

In the present embodiment, when the brightness of the liquid crystal panel 15 is increased (or decreased), the parallax is decreased (or increased), and at the same time the quick shoot is controlled. However, the quick shoot control may not be performed.
Further, when changing the parallax, the user may accept the setting of the change amount.
Further, when the luminance of the backlight unit 19 is lowered, the parallax may not be changed.

Embodiment 2. FIG.
The TV receiver according to Embodiment 2 of the present invention has the same configuration as that of the TV receiver 1 according to Embodiment 1 except that the processing of the system control unit 12 is different.
FIG. 8 is a flowchart showing the procedure for changing the brightness by the system control unit 12.
The system control unit 12 determines whether or not the user has received an instruction to change the display brightness of the liquid crystal panel 15 (S11). When the system control unit 12 determines that the instruction has not been received (S11: NO), the determination process is repeated.

  When the system control unit 12 determines that the instruction has been received (S11: YES), that is, when it is determined that the user has pressed the “brightness change” button, a brightness setting GUI screen is displayed on the liquid crystal panel 15. Then, it is determined whether or not a setting to brighten from the current time is accepted by the operation of the remote control device by the user, that is, whether or not an instruction to brighten is accepted (S12).

If the system control unit 12 determines that an instruction to brighten has been received (S12: YES), for example, if it receives an instruction to change the current “3” to “4”, the duty ratio of the PWM control is set to “4”. The value is changed to a corresponding value, and the backlight control unit 18 performs PWM control with the changed duty ratio to increase the luminance of the backlight unit 19 (S13).
At the same time, the system control unit 12 performs adjustment (correction) to reduce the parallax by the parallax adjustment unit 16, and gives the obtained correction value to the panel control unit 14 (S14). When the parallax adjustment unit 16 calculates the shift amount of the composite position of the left-eye video and the right-eye video, the panel control unit 14 shifts both of the composite video obtained by superimposing the left-eye video and the right-eye video based on the shift amount. The liquid crystal panel 15 is driven by controlling the (parallax) to be small. When the parallax adjustment unit 16 adjusts the depth information, the system control unit 12 outputs the left-eye video signal and the right-eye video signal based on the depth information to the liquid crystal panel 15 by the panel control unit 14.

  At the same time, the system control unit 12 also sets the pulse width of the open period of the liquid crystal shutter of the glasses 21 when displaying the left-eye image and the right-eye image, and controls the glasses based on the set open period. The opening / closing of the shutter of the glasses 21 is controlled by the unit 20 (S15), and the process is terminated.

  If the system control unit 12 determines in step S12 that it has not received an instruction to brighten, that is, has received an instruction to darken (S12: NO), for example, receives an instruction to change “3” at the current time to “2”. In such a case, the PWM control duty ratio is changed to a value corresponding to “2”, and the backlight control unit 18 performs PWM control with the changed duty ratio to lower the luminance of the backlight unit 19 (S16).

  At the same time, the system control unit 12 performs correction to increase the parallax by the parallax adjustment unit 16, and gives the obtained correction value to the panel control unit 14 (S17). When the parallax adjustment unit 16 calculates the shift amount of the composite position of the left-eye video and the right-eye video, the panel control unit 14 shifts both of the composite video obtained by superimposing the left-eye video and the right-eye video based on the shift amount. The liquid crystal panel 15 is driven by controlling so that (parallax) increases. When the parallax adjusting unit 16 adjusts the depth information, the system control unit 12 outputs the left-eye video signal and the right-eye video signal based on the depth information to the liquid crystal panel 15 by the panel control unit 14, and the liquid crystal panel 15 Drive.

  At the same time, the system control unit 12 also sets the pulse width of the open period of the liquid crystal shutter of the glasses 21 at the time of displaying the left-eye video and the right-eye video, and controls the glasses based on the set open period. The opening / closing of the shutter of the glasses 21 is controlled by the unit 20 (S18), and the process is terminated.

  Since the present embodiment is configured as described above, when the brightness of the liquid crystal panel 15 is increased, it takes time for the luminance response, but at the same time, the parallax is reduced and the shutter opening period of the glasses 21 is increased. The occurrence of crosstalk can be suppressed. In addition, when the brightness of the liquid crystal panel 15 is reduced, the luminance response time is shortened, so that the occurrence of crosstalk is suppressed, and at the same time, by increasing the parallax, a stereoscopic effect is imparted as the darkness is reduced. This makes it easier to see the video. At this time, the opening period of the shutter of the glasses 21 can be lengthened.

  It should be considered that the above-described embodiment disclosed herein is illustrative in all respects and not restrictive. The scope of the present invention is not intended to include the above-described meanings, but is intended to include meanings equivalent to the claims and all modifications within the scope of the claims.

DESCRIPTION OF SYMBOLS 1 TV receiver 2 Tuner 3 External input part 4 PC input part 5 HDMI input part 6 Input signal switching part 7, 8 AD conversion part 9 3DYC separation part 10 Color space conversion part 11 2D / 3D determination part 12 System control part 13 Gamma Correction unit 14 Panel control unit 15 Liquid crystal panel 16 Parallax adjustment unit 17 Quick shoot control unit 18 Backlight control unit 19 Backlight unit 20 Glasses control unit 21 Glasses

Claims (5)

In a display device comprising a display means for displaying a stereoscopic video based on a left-eye video signal and a right-eye video signal, and a parallax adjustment means for adjusting the parallax between the video based on the left-eye video signal and the video based on the right-eye video signal ,
Brightness adjustment means for adjusting the brightness of the display means;
The display device according to claim 1, wherein the parallax adjusting unit is configured to adjust the parallax based on the brightness adjusted by the brightness adjusting unit. A backlight for irradiating the display means with light;
The display device according to claim 1, wherein the brightness adjustment unit is configured to adjust a luminance of the backlight. Emphasis processing means for performing brightness enhancement processing based on transition of an input video signal,
The display device according to claim 1, wherein the enhancement processing unit is configured to perform the enhancement processing based on the brightness adjusted by the brightness adjustment unit. Glasses having a left-eye shutter that adjusts the amount of light transmitted to the left eye, and a right-eye shutter that adjusts the amount of light transmitted to the right eye;
Shutter opening and closing means for controlling opening and closing of the left-eye shutter and the right-eye shutter based on the left-eye video signal and the right-eye video signal;
The shutter opening / closing means is configured to control the opening / closing based on the brightness adjusted by the brightness adjusting means. Display device. A display device according to any one of claims 1 to 4,
A receiver for receiving television broadcasts,
A television receiver configured to display an image on the display device based on a television broadcast received by the receiving unit.

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