JP2012189803A - Liquid crystal display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device and a television receiver capable of displaying video with display characteristics suitable for the actual posture of a liquid crystal panel.SOLUTION: The posture of a liquid crystal panel for displaying video is detected, and in response to the detected posture of the liquid crystal panel, based on preset correction parameters, display characteristics with visual angle dependency in the liquid crystal panel (view angle, contrast, brightness, gamma characteristic, color tone, hue or the like) are corrected. For instance, as the inclination angle of display surface of the liquid crystal panel with respect to the horizontal increases, the view angle of the liquid crystal panel gradually becomes wider.

Description

  The present invention relates to a liquid crystal display device and a television receiver including a liquid crystal panel for displaying an image, and more particularly to a technique for correcting display characteristics in a liquid crystal panel.

The liquid crystal display device includes a liquid crystal panel that displays an image based on an input video signal. For example, an example of a liquid crystal display device is a television receiver that displays a television program based on a television broadcast signal. In recent years, liquid crystal display devices are also installed in cellular phones, portable information communication terminals, various electric appliances, and the like.
By the way, how an image displayed on the liquid crystal panel of the liquid crystal display device looks depends on the angle (viewing angle) at which the viewer views the liquid crystal panel. For example, when the liquid crystal panel is viewed from an oblique direction, the brightness of the displayed image is reduced and the color tone is reversed. The viewing angle range in which the display image on the liquid crystal panel can be normally viewed is called a viewing angle as an index indicating the performance of the liquid crystal display device. Note that the viewing angle is represented by an angle centered on a perpendicular to the display surface of the liquid crystal panel. It is known that this viewing angle can be changed by changing the alignment direction of the liquid crystal molecules in the viewing angle changing liquid crystal panel arranged opposite to the liquid crystal panel.
For example, Patent Document 1 proposes changing the viewing angle of a display image on a liquid crystal panel depending on whether a camera mode for taking a picture or an audio mode for audio reproduction.

JP 2006-162707 A

However, in the technique described in Patent Document 1, the viewing angle of the liquid crystal panel is merely changed according to the operation mode. For this reason, the viewing angle is not suitable for the actual orientation of the liquid crystal panel, and the viewer may not be able to see the video normally.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal display device capable of displaying an image with display characteristics (viewing angle, etc.) suitable for the actual orientation of the liquid crystal panel. And providing a television receiver.

In order to achieve the above object, the present invention provides a liquid crystal display device comprising a liquid crystal panel for displaying an image and a posture detecting means for detecting the posture of the liquid crystal panel, wherein each pixel of the liquid crystal panel has a viewing angle. A sub-pixel whose characteristics can be individually changed, and the viewing angle characteristic of the sub-pixel is changed based on a preset correction parameter corresponding to the attitude of the liquid crystal panel detected by the attitude detection unit It is comprised as a liquid crystal display device characterized by doing. For example, one or more of contrast, brightness, gamma characteristics, color tone, and color are changed based on the correction parameter.
According to the present invention, it is possible to display an image with display characteristics (viewing angle, contrast, brightness, gamma characteristics, color tone, color, etc.) suitable for the actual orientation of the liquid crystal panel.
For example, it is conceivable that the correction parameter corrects the viewing angle characteristic of the sub-pixel so that the viewing angle of the liquid crystal panel becomes wider as the display surface of the liquid crystal panel approaches from horizontal to horizontal. As a result, the viewing angle of the liquid crystal panel when the viewing angle is likely to be small is not increased more than necessary, and the viewing angle is widened according to the orientation of the liquid crystal panel when the viewing angle is likely to be large. It is possible for the viewer to view normal video.
Further, the correction parameter corrects the viewing angle characteristics of the sub-pixel so that the contrast and brightness of the display image of the liquid crystal panel increases as the display surface of the liquid crystal panel approaches from horizontal to horizontal. Is also possible. As a result, the image quality of the liquid crystal panel when the viewing angle is likely to be small is not reduced more than necessary, and the contrast and brightness are increased corresponding to the orientation of the liquid crystal panel when the viewing angle is likely to be large. This makes it possible for the viewer to view the video with the highest possible image quality.
By the way, the present invention may be regarded as an invention of a television receiver including the liquid crystal display device configured as described above.

  According to the present invention, it is possible to display an image with display characteristics (viewing angle, contrast, brightness, gamma characteristics, color tone, color, etc.) suitable for the actual orientation of the liquid crystal panel.

The schematic diagram which shows the external appearance of the television receiver X which concerns on embodiment of this invention. 1 is a block diagram illustrating a schematic configuration of a television receiver X according to an embodiment of the present invention. The figure for demonstrating the attitude | position of the liquid crystal panel 161 of the television receiver X which concerns on embodiment of this invention. The figure which shows an example of the change method of a viewing angle characteristic. The figure which shows an example of correction information. The figure for demonstrating an example of the correction result of a viewing angle characteristic. The figure which shows the other example of correction information.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
First, an external configuration of the television receiver X according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, a television receiver X according to an embodiment of the present invention includes a monitor unit 1 (an example of a liquid crystal display device) that displays an image, a cradle unit 2 to which the monitor unit 1 can be attached and detached. It has. The present invention can also be applied to, for example, a display device of a personal computer, a mobile phone, a portable information communication terminal, various electric appliances, and the like.
Here, FIG. 1A shows a state in which the monitor unit 1 is set on the cradle unit 2, and FIG. 1B shows a state in which the monitor unit 1 is detached from the cradle unit 2.
The cradle unit 2 is connected to a broadcast receiving antenna 3 for receiving a television broadcast signal from a television broadcast station. The cradle unit 2 inputs the television broadcast signal received from the broadcast receiving antenna 3 to the monitor unit 1 by wired communication or wireless communication using radio waves. Thereby, the monitor unit 1 displays the video of the television program based on the input television broadcast signal. Of course, the monitor unit 1 may directly receive a television broadcast signal from an antenna in a wired or wireless manner.
The cradle unit 2 is connected to a commercial AC power supply 4 and is driven by electric power supplied from the commercial AC power supply 4. On the other hand, the monitor unit 1 is not connected to a commercial AC power source but is driven by electric power supplied from a secondary battery or the like mounted on the monitor unit 1. The secondary battery is charged by attaching the monitor unit 1 to the cradle unit 2. Further, a wireless power transmission technology that wirelessly supplies power from the cradle unit 2 to the monitor unit 1 may be employed. Of course, a configuration in which the monitor unit 1 can be connected to a commercial AC power supply is also conceivable.

Next, detailed configurations of the monitor unit 1 and the cradle unit 2 will be described with reference to FIG.
As shown in FIG. 2, the cradle unit 2 includes a main control unit 21, a wireless transmission / reception unit 22, a wired connection detection unit 23, a video processing unit 24, an audio processing unit 25, a tuner 26, an external input unit 27, and a signal switching unit 28. , OSD control unit 29, wired interface 30 and the like.
The main control unit 21 includes control devices such as a CPU, a RAM, and a ROM, and comprehensively controls the cradle unit 2 according to a predetermined control program. The main control unit 21 may be an electric circuit such as an ASIC.

The tuner 26 is a signal (hereinafter referred to as a broadcast signal) in which video signals for a plurality of channels of various television broadcasts such as digital terrestrial broadcasts and BS / CS broadcasts and audio signals synchronized with the video are superimposed from the broadcast receiving antenna 3. Receive. The tuner 26 extracts (selects) a broadcast channel signal instructed by the main control unit 21 from the broadcast signal, extracts a video signal and an audio signal by detecting the extracted signal, and extracts the video signal and the audio signal. A signal is input to the signal switching unit 28.
The external input unit 27 is an interface for inputting a composite video signal and audio signal input from the outside, a separate video signal and audio signal (so-called S terminal signal), and the like to the signal switching unit 28. . For example, a video playback device Y such as a DVD recorder, a Blu-ray recorder, or a hard disk recorder is connected to the external input unit 27.
The signal switching unit 28 inputs the video signal and the audio signal input from either the tuner 26 or the external input unit 27 selected according to the control instruction from the main control unit 21 to the video processing unit 24 and the audio processing unit 25. . The selection of the output video from the tuner 26 or the signal switching unit 28 by the main control unit 21 may be performed based on a control instruction from the main control signal 11 of the monitor unit 1.
Further, the OSD control unit 29 is an OSD to be displayed on the monitor unit 1 in a superimposed manner on the video such as menu display, electronic program guide, various status information (volume, display channel, etc.) in accordance with a control instruction from the main control unit 21. Information is input to the video processing unit 24.
The video processing unit 24 separates a horizontal synchronization signal and a vertical synchronization signal from a video signal, generates a clock signal that is phase-synchronized with the synchronization signal, separates a luminance signal and a color signal from the video signal, a predetermined display characteristic improvement process, and the like Are processed, and the processed video signal is output. In addition, when OSD information is input from the OSD control unit 29, the video processing unit 24 also has an OSD display function for generating a video signal for displaying the OSD information superimposed on the display video.
The audio processing unit 25 performs various signal processing such as equalization processing and surround processing on an input audio signal, and outputs the processed audio signal.
The video signal and the audio signal output from the video processing unit 24 and the audio processing unit 25 are input to the wireless transmission / reception unit 22 and the wired interface 30, respectively.

The wireless transmission / reception unit 22 has a communication modem function for realizing wireless data communication with the wireless transmission / reception unit 12 of the monitor unit 1 by transmitting / receiving radio waves through the antenna 22a. The communication modem function realizes wireless communication by an OFDM (Orthogonal Frequency-Division Multiplexing) wireless system compliant with, for example, the IEEE802.11 standard used also for a wireless LAN or the like. For example, a 2.4 GHz band, a 5 GHz band, or the like is used as the frequency of this wireless communication.
Specifically, the wireless transmission / reception unit 22 transmits data such as a video signal and an audio signal output from the video processing unit 24 and the audio processing unit 25 according to a control instruction from the main control unit 21 by wireless communication. Send to. For example, video signals and audio signals are transmitted in a video compression format such as MPEG2.

The wired interface 30 has a connection terminal that is connected to the wired interface 18 of the monitor unit 1 when the monitor unit 1 is attached to the cradle unit 2. The wired interface 30 also includes a modem function for realizing wired data communication with the monitor unit 1 via a connection terminal. Specifically, the wired interface 30 sends data such as video signals and audio signals output from the video processing unit 24 and the audio processing unit 25 to the monitor unit 1 by wired communication in response to a control instruction from the main control unit 21. Send.
The wired connection detection unit 23 detects whether or not the wired interface 30 is connected to the wired interface 18 of the monitor unit 1, that is, whether or not the monitor unit 1 and the cradle unit 2 are connected by wire. Note that various conventional disconnection detection techniques can be used as a method for detecting the presence or absence of connection by the wired connection detection unit 23. Then, the detection result by the wired connection detection unit 23 is input to the main control unit 21. The detection result is used in the main control unit 21 to determine whether to perform data communication with the monitor unit 1 by wired communication or wireless communication.

On the other hand, the monitor unit 1 includes a main control unit 11, a wireless transmission / reception unit 12, a data processing unit 13, a video processing unit 14, an audio processing unit 15, a video display unit 16, a speaker 17, a wired interface 18, an inclination angle sensor 163 (attitude). An example of detection means).
The main control unit 11 has a control device such as a CPU and a RAM, and controls the monitor unit 1 according to a control program and various parameters stored in the ROM 11a. The main controller 11 may be an electric circuit such as an ASIC.
The wireless transmission / reception unit 12 has a communication modem function for realizing wireless data communication with the wireless transmission / reception unit 22 of the cradle unit 2 by transmitting / receiving radio waves through the antenna 12a. The communication modem function realizes wireless communication by an OFDM (Orthogonal Frequency-Division Multiplexing) wireless system compliant with, for example, the IEEE802.11 standard used also for a wireless LAN or the like. For example, a 2.4 GHz band, a 5 GHz band, or the like is used as the frequency of this wireless communication. Specifically, the wireless transmission / reception unit 12 receives data such as a video signal and an audio signal transmitted from the cradle unit 2 by wireless communication, and inputs the data to the data processing unit 13.
The data processing unit 13 is a decoder that decodes data in a video compression format such as MPEG2 input from the wireless transmission / reception unit 12. The video signal and audio signal decoded by the data processing unit 13 are input to the video processing unit 14 and the audio processing unit 15.

The wired interface 18 has a connection terminal that is connected to the wired interface 30 of the cradle unit 2 when the monitor unit 1 is attached to the cradle unit 2. The wired interface 18 also includes a modem function for realizing wired data communication with the cradle unit 2 via a connection terminal. Specifically, the wired interface 18 receives data such as a video signal and an audio signal transmitted from the monitor unit 1 by wired communication, and inputs the video signal and the audio signal to the video processing unit 14 and the audio processing unit 15. .
The audio processing unit 15 performs various types of audio processing such as volume adjustment, equalization processing, and surround processing on the audio signal input from the data processing unit 13 or the wired interface 18, and outputs the processed audio signal to the speaker 17. input. Thereby, the speaker 17 reproduces sound based on the sound signal input from the sound processing unit 15.

The video processing unit 14 has arithmetic means such as a CPU and MPU, and performs various image processing such as scaling processing and resolution conversion processing on the video signal input from the data processing unit 13 or the wired interface 18. The processed video signal is input to the video display unit 16. As a result, the video display unit 16 displays a video based on the input video signal.
The video display unit 16 includes a liquid crystal panel 161, a backlight 162, and the like.
The liquid crystal panel 161 is formed of a liquid crystal layer, a scan electrode and a data electrode for applying a scan signal and a data signal to the liquid crystal layer, and has a conventionally known active liquid crystal device having a plurality of liquid crystal elements whose transmittance changes depending on the applied voltage. It is a matrix type liquid crystal panel. The video display unit 16 is also provided with a liquid crystal driving circuit (not shown) for controlling the driving of the liquid crystal elements of the liquid crystal panel 161 based on the input video signal, vertical synchronizing signal, and horizontal synchronizing signal. As a result, a video based on the video signal input from the video processing unit 14 is displayed on the liquid crystal panel 161.
The backlight 162 includes a large number of LEDs arranged in parallel on at least one side of the liquid crystal panel 161 and a light guide plate that guides light emitted from the LEDs to the entire back surface of the liquid crystal panel 161. That is, the backlight 162 is a so-called edge-type backlight that illuminates the liquid crystal panel 161 from the back surface by each of the LEDs arranged at the edge of the liquid crystal panel 161. Of course, the backlight 162 may be a so-called direct-type backlight having LEDs or the like disposed on the back surface of the liquid crystal panel 161.

The tilt angle sensor 163 detects the attitude of the liquid crystal panel 161 and is provided in the liquid crystal panel 161 or the backlight 162. The tilt angle sensor 163 is a conventionally known tilt angle sensor such as an acceleration sensor or a gyro sensor. The attitude of the liquid crystal panel 161 detected by the tilt angle sensor 163 is input to the main control unit 11. In the present embodiment, it is assumed that the tilt angle sensor 163 detects the tilt (tilt around the horizontal axis) of the liquid crystal panel 161 with respect to the horizontal direction (short direction).
Specifically, as shown in FIG. 3, the tilt angle sensor 163 sets the tilt angle when the liquid crystal panel 161 is placed on a desk or the like (when the display surface is parallel to the horizontal direction) to 0 °, and the liquid crystal panel 161 Detect the slope of. For example, when the monitor unit 1 is placed on the cradle unit 2 or placed on a wall, the inclination when the liquid crystal panel 161 is set up in parallel with the vertical direction is 90 °. When tilted upside down, the inclination is −90 °. Further, the liquid crystal panel 161 may be used in a tilted (tilted) state inclined by an arbitrary angle (for example, 45 °) by a viewer.

Incidentally, the liquid crystal panel 161 includes four sub-pixels 161a to 161d for each pixel as shown in FIG. 4A shows a configuration example in which four subpixels 161a to 161d are arranged side by side in the horizontal direction, and FIG. 4B shows a configuration example in which four subpixels 161a to 161d are arranged side by side in the vertical and horizontal directions. An example configuration is shown.
In addition, each of the subpixels 161a to 161d includes pixels corresponding to R, G, and B. In the monitor unit 1, the viewing angle characteristics of each of the subpixels 161 a to 161 d in the liquid crystal element are changed by the voltage applied to the liquid crystal element of the liquid crystal panel 161. In the initial state, in the liquid crystal panel 161, the viewing angle characteristics of the subpixels 161a, 161b, 161c, and 161d are optimized so that the visibility and image quality when viewed from the direction perpendicular to the display surface of the liquid crystal panel 161 are optimized. The display characteristics are adjusted.

In the monitor unit 1 configured as described above, how the display image of the liquid crystal panel 161 appears depends on an angle (viewing angle) with respect to the perpendicular of the display surface when the viewer views the display surface of the liquid crystal panel 161.
Therefore, in the television receiver X according to the embodiment of the present invention, the main control unit 11 of the monitor unit 1 depends on the viewing angle of the liquid crystal panel 161 according to the attitude of the liquid crystal panel 161 detected by the tilt angle sensor 163. Correct display characteristics.
Hereinafter, the contents of the viewing angle control process executed by the main control unit 11 will be described. In the present embodiment, a viewing angle characteristic will be described as an example of display characteristics having a viewing angle dependency in the liquid crystal panel 161. Here, the main control unit 11 can be considered as display characteristic correction means for executing the viewing angle control process, and the process may be executed by another control unit.

For example, correction information shown in FIG. 5 is stored in advance in the ROM 11a that can be referred to by the main control unit 11. The correction information is obtained by setting the correspondence between the orientation of the liquid crystal panel 161 and the correction parameters Pa to Pe in advance. The correction parameters Pa to Pe are parameters set in advance to realize a viewing angle that is set in advance as an appropriate viewing angle corresponding to each posture of the liquid crystal panel 161. For example, the correction parameters Pa to Pe may be set in such a manner that the posture (tilt) of the liquid crystal panel 161 is divided for each predetermined range and is associated with each predetermined range.
Here, the correction parameters Pa to Pe are “normal” viewing angle characteristics that provide the best image quality when the viewer views the liquid crystal panel 161 from the direction perpendicular to the display surface with the liquid crystal panel 161 standing. Is a parameter for correcting the normal viewing angle characteristic to a viewing angle characteristic corresponding to the orientation of the liquid crystal panel 161.
Specifically, the correction parameters Pa to Pe of the correction information shown in FIG. 5 are obtained as the orientation of the liquid crystal panel 161 approaches from the standing position or the upside down standing position, that is, the display surface of the liquid crystal panel 161 is changed from the vertical position. It is determined that the viewing angle of the display image of the liquid crystal panel 161 gradually increases as it approaches the horizontal. Therefore, the viewing angle of the liquid crystal panel 161 is maximized when laying down and minimized when standing upside down or upside down.
Then, the main control unit 11 extracts one of the correction parameters Pa to Pe from the correction information in accordance with the attitude of the liquid crystal panel 161 detected by the tilt angle sensor 163, and the liquid crystal panel 161 of the liquid crystal panel 161 is extracted based on the correction parameter. Correct the viewing angle of the displayed image. Specifically, the viewing angle of the liquid crystal panel 161 is changed by changing the voltage value applied to each liquid crystal element of the liquid crystal panel in accordance with a control instruction from the main control unit 11. Thereby, the viewing angle of the liquid crystal panel 161 can be adjusted to an appropriate viewing angle set in advance corresponding to the posture of the liquid crystal panel 161.

FIG. 6 is a diagram illustrating an example of the viewing angle of the liquid crystal panel 161 by the main control unit 11. Specifically, the normal viewing angle characteristics when the liquid crystal panel 161 is set upright or upside down are shown. In the following, it is assumed that the contrast when viewed from the direction perpendicular to the display surface of the liquid crystal panel 161 in the normal viewing angle characteristic is 100%. Note that the viewing angle at which the image on the liquid crystal panel 161 can be normally viewed is a viewing angle range in which the contrast is 60% or more.
In this state, when the viewing angle is within ± 45 °, the contrast is 60% or more, and the viewing angle is 90 °. In particular, the viewing angle characteristic shown in FIG. 6 has a contrast of 100% when the viewing angle is 0 °, and is the most suitable display characteristic when viewed from the direction perpendicular to the display surface of the liquid crystal panel 161. The main control unit 11 corrects the viewing angle characteristics based on the correction parameters Pa to Pe, thereby realizing the viewing angle characteristics suitable for the posture of the liquid crystal panel 161. The correction parameters Pa and Pe corresponding to the case where the liquid crystal panel 161 is set upright or upside down maintain “normal” viewing angle characteristics.

When the liquid crystal panel 161 is laid down (0 °), the main control unit 11 extracts the correction parameter Pc corresponding to the state from the correction information (see FIG. 5). Here, the correction parameter Pc is predetermined in order to control the sub-pixel in each pixel of the liquid crystal panel 161 so that the contrast becomes optimal when the viewing angle of the liquid crystal panel 161 is viewed from the direction of 0 °. Is. Specifically, when the liquid crystal panel 161 is laid down, the subpixels 161b and 161c may be controlled so that the contrast is optimal when viewed from the direction of 0 °. The subpixel 161b may be adjusted so as to be optimal when viewed from the lower side of the liquid crystal panel 161 and the subpixel 161c is viewed at an angle of 0 ° from the upper direction of the liquid crystal panel 161.
As a result, even when the liquid crystal panel 161 is laid down and the viewer views the liquid crystal panel 161 from an oblique direction, the viewer can normally view the video on the liquid crystal panel 161.
By the way, when the liquid crystal panel 161 is viewed from the direction of 0 °, the contrast and brightness of the other subpixels 161a and 161d are lowered, so that the contrast and brightness of the subpixels 161a and 161d are increased. It is desirable.

Further, when the liquid crystal panel 161 is placed obliquely at an inclination of 45 ° or −45 °, the main control unit 11 extracts the correction parameter Pb corresponding to the state from the correction information. Here, the correction parameter Pb or Pc controls the sub-pixel in each pixel of the liquid crystal panel 161 so that the contrast is optimal when the viewing angle of the liquid crystal panel 161 is viewed from the direction of 45 ° or −45 °. Therefore, it is predetermined. Specifically, when the liquid crystal panel 161 is inclined by 45 °, it may be controlled so that the contrast is optimal when the subpixel 161b is viewed from the 45 ° direction. Similarly, when the liquid crystal panel 161 is inclined by −45 °, the sub-pixel 161c may be controlled so that the contrast is optimal when viewed from the −45 ° direction.
Thus, even when the liquid crystal panel 161 is obliquely placed at an inclination of 45 ° or −45 °, and the viewer views the liquid crystal panel 161 from an oblique direction of 45 ° or −45 °, the viewer can The video on the liquid crystal panel 161 can be normally viewed.
Also in this case, when the liquid crystal panel 161 is placed obliquely at an inclination of 45 °, the contrast and brightness of the remaining subpixels 161a, 161c, 161d excluding the subpixel 161b corresponding to that direction are lowered. It is desirable to correct so that the contrast and brightness of the subpixels 161a, 161c, and 161d are increased. Further, when the liquid crystal panel 161 is obliquely placed at an inclination of −45 °, the contrast and brightness of the remaining subpixels 161a, 161b, and 161d excluding the subpixel 161c corresponding to the direction are lowered. It is desirable to correct so that the contrast and brightness of the subpixels 161a, 161b, and 161d are increased.

As described above, in the television receiver X, since the viewing angle of the liquid crystal panel 161 of the monitor unit 1 is appropriately adjusted according to the actual orientation of the liquid crystal panel 161, there is a high possibility that the viewing angle is small. If the viewing angle of the liquid crystal panel 161 is not unnecessarily widened and the viewing angle is likely to be large, the viewing angle can be widened according to the orientation of the liquid crystal panel 161 to allow the viewer to view normal video. It becomes possible.
Further, the normal viewing angle characteristic correction method is not limited to correction based on the correction parameters Pa to pe associated with each posture of the liquid crystal panel 161, and for example, the posture of the liquid crystal panel 161 by a predetermined arithmetic expression set in advance. Another embodiment may be considered in which a correction factor is calculated according to (tilt) and the normal viewing angle characteristic is changed according to the correction factor.

By the way, in the said embodiment, the viewing angle characteristic was mentioned as an example as an example of the display characteristic which has the viewing angle dependence in the liquid crystal panel 161, and demonstrated. On the other hand, regarding video display by the liquid crystal panel 161, display characteristics such as contrast, brightness, gamma characteristics, color tone, and color as well as the viewing angle have a viewing angle dependency that varies depending on the viewing angle of the viewer.
For this reason, the main control unit 11 corresponds to any one or more of display characteristics depending on the viewing angle such as viewing angle, contrast, brightness, gamma characteristics, color tone, and tint corresponding to the attitude of the liquid crystal panel 161. It is conceivable as another embodiment to appropriately change in accordance with preset correction parameters.
FIG. 7 shows another example of the contents of the correction parameters Pa to Pe used for correcting the display characteristics of the liquid crystal panel 161. As shown in FIG. 7, as the display surface of the liquid crystal panel 161 becomes closer to the horizontal, the brightness and contrast gradually increase and the viewing angle gradually increases so that the correction parameters Pa˜ It is conceivable to define the contents of Pe.
Then, the main control unit 11 extracts one of the correction parameters Pa to Pe corresponding to the attitude of the liquid crystal panel 161 detected by the tilt angle sensor 163 and controls the video processing unit 14 to control the liquid crystal panel 161. Adjust the brightness, contrast, and viewing angle of the displayed image appropriately.
Accordingly, the image quality of the liquid crystal panel 161 when the viewing angle is likely to be small is not unnecessarily deteriorated, and the contrast and brightness are increased corresponding to the posture of the liquid crystal panel 161 when the viewing angle is likely to be large. This makes it possible for the viewer to view the video with the highest possible image quality. In addition, the viewing angle of the liquid crystal panel 161 when the viewing angle is likely to be small is not increased more than necessary, and the viewing angle is widened according to the posture of the liquid crystal panel 161 when the viewing angle is likely to be large. It is also possible for a person to view normal video.

In the above embodiment, the case where the viewing angle in the vertical direction is adjusted according to the vertical tilt (tilt around the horizontal axis) of the liquid crystal panel 161 has been described as an example. On the other hand, the viewing angle of the liquid crystal panel 161 includes a viewing angle in the left-right direction (longitudinal direction) of the liquid crystal panel 161. Therefore, by the same method, the main control unit 11 changes the viewing angle in the horizontal direction instead of the vertical viewing angle of the liquid crystal panel 161 according to the horizontal tilt of the liquid crystal panel 161 (tilt around the vertical axis). It is also possible to adjust appropriately.
In this case, if the contrast and brightness of each of the subpixels 161a and 161d are optimally set according to the tilt angle of the liquid crystal panel 161, and correction is performed so as to increase the contrast and brightness of the other subpixels 161b and 161c. Good.

  The present invention can be used for a liquid crystal display device and a television receiver.

1: Monitor unit (liquid crystal display device)
2: Cradle unit 3: Broadcast receiving antenna 4: Commercial AC power supply 11: Main control unit 11a: ROM
12: wireless transmission / reception unit 12a: antenna 13: data processing unit 14: video processing unit 15: audio processing unit 16: video display unit 161: liquid crystal panels 161a to 161d: subpixel 162: backlight 163: tilt angle sensor 17: speaker 18: Wired interface 21: Main control unit 22: Wireless transmission / reception unit 22a: Antenna 23: Wired connection detection unit 24: Video processing unit 25: Audio processing unit 26: Tuner 27: External input unit 28: Signal switching unit 29: OSD control Unit 30: Wired interface X: Television receiver Y: Video playback device

Claims (5)

A liquid crystal display device comprising a liquid crystal panel for displaying an image and an attitude detection means for detecting the attitude of the liquid crystal panel,
Each pixel of the liquid crystal panel has subpixels whose viewing angle characteristics can be individually changed, and based on correction parameters set in advance corresponding to the orientation of the liquid crystal panel detected by the orientation detection means A liquid crystal display device, wherein a viewing angle characteristic of the sub-pixel is changed.   The liquid crystal display device according to claim 1, wherein one or more of contrast, brightness, gamma characteristics, color tone, and tint is changed based on the correction parameter.   3. The correction parameter according to claim 1, wherein the viewing angle characteristic of the sub-pixel is corrected so that the viewing angle of the liquid crystal panel becomes wider as the display surface of the liquid crystal panel approaches from horizontal to horizontal. A liquid crystal display device according to 1.   The correction parameter corrects the viewing angle characteristic of the sub-pixel so that the contrast and / or brightness of a display image of the liquid crystal panel increases as the display surface of the liquid crystal panel approaches from horizontal to horizontal. Item 4. A liquid crystal display device according to any one of Items 1 to 3. A television receiver comprising the liquid crystal display device according to claim 1.

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