JP2007292810A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of improving visibility of reflected light from a screen to one observer or a plurality of observers sitting on a rear seat of a car. <P>SOLUTION: The display device 100 includes a display panel 110 which is installed in the cabin of the car and displays an image on a display screen, an observer position receiver 520 which comprises sitting sensors 301 and 302 and outputs detected observer position information, external light receivers 540 to 560 for observer which output sensor values indicating quantities of reflected light from the screen to the respective observers from photodetection sensors 111 to 114, and a storage unit 510 which stores a table of sensor values relating to reflection image quality correction processing, pixel positions, and gain correction coefficients and other various information. Then a controller 500 corrects image quality according to reflection depending upon a display position by referring to information in the storage unit 510 based upon readout information from the respective receivers 520 to 560 and pieces Ic1 and Ic2 of video feature quantity information (luminance) from signal processing units 570 and 580. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device that can display a plurality of images (including videos), and more particularly, to a display device that displays images in a passenger compartment of a vehicle.

  In recent years, with the advancement of digital technology and communication technology, a wide variety of in-vehicle electronic devices have been developed. In particular, an image recorded on a recording medium such as a CD-ROM or DVD or a television broadcast image using a display such as an LCD, such as a navigation system, a DVD (Digital Versatile Disk) player, and a television receiver. Display devices capable of displaying the above have become widespread.

  In recent years, there is also an in-vehicle device in which two display devices are connected as a vehicle is upgraded or enlarged. For example, by installing one display device between the driver seat and the passenger seat and installing the other display device in front of the rear seat, not only the driver and passenger in the passenger seat, but also the passenger in the rear seat In addition, various information displayed on the display device can be viewed. When such a display device is irradiated with sunlight or the like, the visibility is significantly deteriorated by the reflected light.

Therefore, for example, Patent Document 1 discloses a display device that automatically controls the brightness of a display. The display device described in Patent Literature 1 includes an optical sensor that detects the illuminance of ambient light in the vicinity of the display, and changes the luminance of the display based on the illuminance detected by the optical sensor. It increases the brightness of the display under bright sunlight during the day and decreases the brightness of the display at night.
JP-T-2001-522058

  Such a conventional in-vehicle display device has a problem that visibility is still poor with respect to reflected light caused by irradiation with sunlight or the like for the following reason.

  FIG. 16 is a diagram illustrating a display example of a display device capable of displaying a plurality of images in the vehicle interior of the vehicle.

  In FIG. 16 (a), 10 is a display device for a rear seat installed in the passenger compartment of the vehicle, and 20 is a rear seat seat on which viewers A and B who view the display screen of the display device 10 sit. . The viewer A is a viewer sitting on the left seat, and the viewer B is a viewer sitting on the right seat. The display device 10 can display two screens. The screen 1 is displayed on the front monitor screen of the viewer A in the left seat, and the screen 2 is displayed on the front monitor screen of the viewer B in the right seat.

  As shown in FIG. 16B, when direct light from the sun hits the display device 10, the direct light is reflected on the monitor screen and enters the visual fields of the viewers A and B, and is reflected by the reflected light from the monitor screen. The viewers A and B have difficulty in seeing the screen. Reflected light from the monitor screen has different effects depending on the sun, the monitor screen, and the position of the viewer. In the case of FIG. 16B, since the viewer A is hardly affected by the reflected light, the screen 1 and the screen 2 of the monitor screen can be viewed well. However, the viewer B is affected by the reflected light, and particularly the direct light from the sun is reflected on the screen 1 of the monitor screen, which is very difficult to see. Thus, it becomes difficult to see due to the reflected light from the monitor screen depending on the position of the viewer.

  Therefore, as in the apparatus described in Patent Document 1, an external light sensor that detects the illuminance of ambient light is provided near the display, and the brightness of the display is changed based on the illuminance detected by the external light sensor. is there.

  FIG. 17 is a diagram illustrating a display example of the display device that changes the illuminance by the external light sensor. The same components as those in FIG. 16 are denoted by the same reference numerals. In FIG. 17, an external light sensor 30 is installed in front of the monitor screen of the display device 10. The external light sensor 30 includes a light receiving element that detects the intensity of external light such as sunlight irradiated from the outside. The display device 10 reduces the influence of external light by changing the illuminance of the entire display according to the ambient brightness detected by the external light sensor 30. When the display device 10 is configured by an LCD display, the change in illuminance is adjusted by the brightness of the backlight disposed on the back surface of the LCD panel.

  However, since the illuminance of the entire display is adjusted according to the ambient brightness detected by one external light sensor, the viewers A and B are viewed side by side on the wide display device. In this case, the correction of the entire display by one external light sensor installed at the lower center of the screen does not provide the optimum illuminance for either viewer A or B viewing the monitor screen. For example, when the viewer B is not on the right seat and only the viewer A is viewing on the left seat, the viewer A reflects light from the monitor screen as shown in FIG. There is no influence. In this case, although the viewer A wants to view with the same brightness, the brightness is adjusted to be excessively bright by changing the illuminance of the entire display by the external light sensor. On the contrary, when the viewer A is not in the left seat and only the viewer B in the right seat is watching, the viewer B is strongly influenced by the reflected light. In this case, although the viewer B wants to adjust the brightness more brightly, the brightness adjustment becomes insufficient by changing the illuminance of the entire display.

  As described above, in a conventional in-vehicle display device, two screens can be displayed, a plurality of viewers are seated side by side, and the viewer views the screen from a very close position. Because we did not consider the specific usage pattern, we wanted to perform only uniform brightness adjustment of the entire display with an external light sensor, so there was a sufficient visibility improvement effect for reflected light from monitor screens such as sunlight. There is a problem that it cannot be obtained.

  The present invention has been made in view of the above points, and can improve the visibility of reflected light from a screen to one or more viewers sitting on a rear seat of a car. The purpose is to provide.

  The display device according to the present invention includes a display unit that displays an image on a display screen, a viewer position reading unit that reads a relative position between the display screen and the viewer, and detects reflected light of external light with respect to the viewer And a picture quality correcting means for correcting the picture quality of the display means based on the glare information.

  In addition, a display device according to another aspect of the present invention individually detects display means for displaying at least one image on a screen and the amount of reflected light from a representative position of the screen to a plurality of viewing positions. From light detection means, storage means for storing setting storage information in which any of the plurality of viewing positions is set for each screen of the display means, and a plurality of detection values detected by the light detection means, A predetermined means is selected based on the setting storage information of the storage means, and a correction means for correcting the image quality of the image displayed on the screen of the display means based on the selected detection value is adopted.

  According to the present invention, it is possible to display in-vehicle use, in particular, two screens, that a viewer sits side by side, and that the viewer views the screen from a very close position. In a specific in-vehicle display device, the influence of reflected light from the screen on each viewer can be reduced, and visibility can be improved.

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

  FIG. 1 is a front view showing an external configuration of a display device according to an embodiment of the present invention, and FIG. 2 is a schematic view of the display device installed at the rear of the vehicle as viewed from above. This embodiment is an example applied to a display device for a rear seat of a vehicle as a display device capable of displaying a plurality of images.

  1 and 2, reference numeral 100 denotes a display device for a rear seat installed in the passenger compartment of the vehicle, 200 denotes a rear seat on which viewers A and B who view the display screen of the display device 100 sit, A seating sensor 302 is installed in the rear seat 200 and detects the seating state of the viewers A and B.

  The display device 100 is composed of a large horizontally long LCD panel or the like, and is installed at a place where the viewers A and B sitting on the rear rear seat 200 can see. As an installation location where a person sitting on the back seat can also enjoy images, for example, it is fixedly installed near the center of the ceiling in the vehicle interior. The display device 100 is configured by an ultra-wide LCD display that is not used in a normal display device. The numerical value in FIG. 1 is an actual size example, and the unit is mm. It goes without saying that if the LCD panel is made larger, it will be easier for the person sitting in the back seat to see the image, but it should not block the rear view from the driver's point of view. As one of them, an ultra-wide LCD display for in-vehicle use is newly developed and adopted this time. The wide LCD display is also particularly suitable for displaying a plurality of screens side by side in the horizontal direction. For example, a television tuner, a VTR player, a DVD (Digital Versatile Disk) player, an image playback device such as a car navigation system is connected to the display device 100, and the viewers A and B in the rear seat enjoy various images and sounds. be able to.

  The display device 100 includes a display panel 110 made of a TFT type horizontally long LCD panel, etc., and four light receptions for detecting the intensity of external light such as sunlight in a specific direction corresponding to a two-screen display and a viewer position. Sensors 111 to 114 and an operation unit 120 on which the viewers A and B perform various input / setting operations are provided. A backlight (not shown) is disposed on the back surface of the display panel 110. The image output to the display panel 110 can be visually recognized by the light from the backlight. The backlight is composed of a CCFL (Cold Cathode Fluorescent Tube) driven by an inverter, but is not limited thereto, for example, EL (Electro Luminescence) or white LED (Light Emitting Diode) as a light source. Other types of light sources can also be used.

  The light receiving sensors 111 to 114 are formed of a phototransistor or the like that detects the intensity of external light, and details will be described later with reference to FIG. The light receiving sensors 111 to 114 are external light sensors that detect the intensity of external light, but differ from the conventional external light sensors that detect the illuminance around the display panel in the following points. That is, (1) as shown in FIG. 2, the light receiving sensors 111 to 114 are provided for a viewer when a certain viewer views the monitor screen from the sitting position (hereinafter simply referred to as the viewer position). The reflected light (that is, the reflection) from the monitor screen that is most disturbing is selectively detected. (2) As shown in FIG. 1, corresponding to the two screens (screen 1 and screen 2) of the display panel 110, the left seat and the right seat are displayed at the lower center of the screen 1 on the left side of the display panel 110. The light receiving sensors 111 and 112 are installed, and the light receiving sensors 113 and 114 for the left seat and the right seat are installed at the lower center of the screen 2 on the right side of the display panel 110. In the present embodiment, the left seat light receiving sensor 111 that receives the reflected light at the viewer A position and the right seat light receiver that receives the reflected light at the viewer B position on the lower center side of the screen 1 of the display panel 110. A sensor 112 is arranged side by side, and a light sensor 113 for the left seat that receives reflected light at the position of the viewer A and a right that receives the reflected light at the position of the viewer B are received at the lower center of the screen 2 of the display panel 110. The seat light receiving sensor 114 is arranged side by side.

  Detection signals detected by the light receiving sensors 111 to 114 are input to the control unit 500 shown in FIG. In addition, it is preferable to arrange the light receiving sensors 111 to 114 at locations where light other than the reflected light viewed from the viewer position, in particular, irradiation light from the backlight is not affected.

  FIG. 3 is a diagram showing a specific configuration of the light receiving sensors 111 to 114, in which FIG. 3 (a) is a front view and FIG. 3 (b) is a side view. The numerical values in the figure are actual size examples, and the unit is mm. Since the light receiving sensors 111 to 114 have the same configuration, the light receiving sensor 111 will be described as a representative.

  In FIG. 3, a light receiving sensor 111 includes a sensor unit 115, a phototransistor 116 that is installed on the bottom surface of the sensor unit 115 and detects the intensity of external light such as sunlight irradiated from the outside, and a sensor. A filter 117 is provided on the light receiving surface of the unit 115 and attenuates light so that the intensity of light received by the light receiving element falls within the measurement range. The light receiving sensors 111 to 114 are not limited to phototransistors but may be photodiodes or solar cells.

FIG. 4 is a diagram illustrating a correspondence relationship between the light receiving element voltages of the light receiving sensors 111 to 114 and the reflected reflection luminance. As shown in FIG. 4, the reflection reflection luminance [cd / m ² ] increases as the light receiving element voltage [V] of the external light sensors 111 to 114 that detect the intensity of external light increases. The reflected reflection luminance can also be calculated by a linear approximation equation shown in the following equation (1) based on the light receiving element voltage.

Reflection reflection brightness = 23.753 × light receiving element voltage + 3.691 (1)
The reflected reflection luminance can be estimated from the light receiving element voltages of the external light sensors 111 to 114 using the correspondence relationship table shown in FIG. 4 or the linear approximation expression shown in Expression (1).

  The light receiving sensors 111 to 114 have the same configuration, but have different mounting positions and mounting methods in order to correspond to the two-screen display and the viewer position. As shown in FIG. 2, first, the light receiving sensor 111 is attached to the lower center of the screen 1 of the display panel 110 with the light receiving surface facing substantially the front of the viewer A on the left seat. The light receiving surface is attached to the viewer B position on the right seat. Similarly, the light receiving sensor 113 is attached to the lower center of the screen 2 of the display panel 110 with the light receiving surface facing the viewer A position on the left seat, and the adjacent light receiving sensor 114 is configured to view the right seat on the right seat. It attaches toward the front of the person B. Specifically, the light receiving sensors 112 and 113 are preferably set to 150 ° with respect to the display panel 110 surface. As shown in FIG. 1, the light receiving sensors 111 to 114 are covered with a transparent acrylic resin, and a sense of unity with the surface of the display panel 110 is maintained.

  Returning to FIG. 1, the operation unit 120 of the display device 100 includes a one-screen display button for the image source 1 (hereinafter referred to as image 1), a one-screen display button for the image source 2 (hereinafter referred to as image 2), and a two-screen display. Button and auto-detect button. The operation unit 120 includes various buttons and switches in addition to four buttons capable of distinguishing “one-screen display of image 1”, “one-screen display of image 2”, “two-screen display”, and “auto-detection”. . For example, operations such as television channel switching, DVD playback, volume adjustment operations, and the like are performed using the corresponding buttons on the operation unit 120. Although not shown in the figure, the sound accompanying the display image of the display device 100 installed for the rear seat is output to a speaker in the passenger compartment, headphones or earphones worn by the viewers A and B, and the like.

  As the installation mode of the display device 100, there are various modes such as hanging on the ceiling in the vehicle, embedding in the headrest of the front seat and the rear surface of the front seat, and placing on the console box or the floor surface. In any case, the main premise of installation is not to obstruct the driver's rear view. A person sitting in the back seat performs operations such as selection of the type of reproduced image, channel switching, screen angle and position adjustment, volume adjustment, and the like using the operation buttons of the operation unit 120.

  The seating sensors 301 and 302 are seating sensors composed of contact switches or the like embedded in the rear seats of the vehicle, generate seating detection signals when an occupant is seated on the seat, and transmit the seating state information to the display device 100 as seating state information. . The seating sensors 301 and 302 detect a seating position of each occupant by arranging a plurality (two in the present embodiment) of the rear seats 200 in the longitudinal direction. Needless to say, three or more seating sensors 301 and 302 may be provided. Also, instead of a seating sensor consisting of a contact switch or the like, a pressure sensor using a piezoelectric element, a weight sensor, a human body detection sensor by detecting a radiation temperature in the vehicle interior, a monitoring camera for monitoring the state of the vehicle interior with an image, etc. It may be used. Further, the seating sensor 301 may be a switch (for example, a contact switch) installed in the seat belt wearing part, and detects the presence or absence of the seating of the occupant (viewer) A on the left side of the seat by detecting the presence or absence of the seat belt. To do. Similarly, the seating sensor 302 may be a switch installed in the seat belt mounting portion, and detects the presence / absence of seating of the passenger (viewer) B on the right side of the seat by detecting the presence / absence of the seat belt mounting.

  FIG. 5 is a block diagram showing a configuration of the display device 100.

  In FIG. 5, the display device 100 is formed of a microprocessor and performs display control of the entire device, and also reads information from the receiving units 520 to 560 and image feature amount information (luminance) Ic1, from the signal processing units 570 and 580. The image processing parameters Vc1 and Vc2 are output by referring to the information in the storage unit 510 based on Ic2 and correcting the image quality according to the reflection of the display position, and the image synthesis of the two-screen synthesis unit 590 is controlled. A control unit 500, a control unit executed by a microprocessor, a storage unit 510 composed of a semiconductor memory for storing various setting information for display control, an operation unit 120 for outputting operation information such as pressing of a button switch, It is connected to the seating sensors 301 and 302, and the viewer position information detected by the sensors 301 and 302 is detected. A viewer position receiving unit 520 that receives Ip, a screen 1 that is connected to the light receiving sensor 111 and receives external light information Ig1 detected by the sensor 111, and an external light receiving unit 530 for the left viewer; Connected to the sensor 112 and receives the external light information Ig2 detected by the sensor 112. The screen 1 is connected to the external light receiving unit 540 for the right viewer and the light receiving sensor 113. Screen 2 for receiving external light information Ig3 External light receiving unit 550 for the left viewer and the light receiving sensor 114, and screen 2 for receiving the external light information Ig4 detected by the sensor 114 for the right viewer An external light receiving unit 560, a signal processing unit 570 (signal processing unit <1>) that processes the image signal Si1 input to the image input terminal 101 according to the image processing parameter Vc1, and an input to the image input terminal 102. Signal processing unit 580 (signal processing unit <2>) that performs signal processing on the image signal Si2 to be processed in accordance with the image processing parameter Vc2, and the processed image signals So1, So2 of the signal processing units 570, 580 based on the control signal of the control unit 500 And a display panel 110 for displaying the display image signal Sc outputted from the two-screen composition unit 590. Although not shown, a loudspeaker is provided. In addition, operation by voice input is also possible by providing a microphone for inputting voice, a voice signal processing unit that digitally processes a reception signal and a voice signal input from the microphone, and a voice recognition unit.

  The display panel 110 is composed of a horizontally long LCD display having a dot matrix configuration. Instead of the LCD display, an organic EL (Electro Luminescence) display device, a PDP (Plasma Display Panel) device, a CRT display device, a projector display device, or the like can be used. The display panel 110 displays various screens for viewers in the backseat, such as icons indicating the operating state of the display function. In the remote controller function mode and the video output function mode, various operation information and a volume adjustment GUI (Graphical User Interface) are displayed.

  The operation unit 120 inputs a remote controller, an escutcheon button, a viewer position setting by an in-vehicle LAN (Local Area Network), and an ON / OFF setting of a reflection image quality correction process.

  The viewer position receiving unit 520 receives the voltage value detected by the seating sensors 301 and 302 as the viewer position information Ip. The viewer position receiving unit 520 receives a voltage value of a detection signal of the seat belt or uses a CCD (Charge) for imaging a seated viewer instead of or in combination with the seating sensors 301 and 302. Coupled Device) Digital information for image recognition by a camera and an image recognition engine may be received. Further, the viewer position receiving unit 520 may receive viewer position information manually input by a remote controller, an escutcheon button, or the like, and further, the viewer position information input to the front seat navigation (driver's seat navigation device). The viewer position information may be received via the in-vehicle LAN.

  The signal processing units 570 and 580 are made of, for example, a DSP (Digital Signal Processor) and the like, acquire the image processing parameters Vc1 and Vc2 from the control unit 500, take in the image signals Si1 and Si2 input to the image input terminals 101 and 102, Signal processing is performed pixel by pixel in accordance with the image processing parameters Vc1 and Vc2.

  The control unit 500 is composed of a microprocessor, and executes display image quality correction processing of display positions, which will be described later with reference to FIGS. 14 and 15, to read information from the receiving units 520 to 560 and from the signal processing units 570 and 580. Image feature amount information (luminance) Ic1 and Ic2 is acquired, and image processing parameters Vc1 and Vc2 for changing the gain correction coefficient are signaled from the storage unit 510 with reference to the light receiving sensor value, pixel position, and gain correction coefficient table. Control to be set in the processing units 570 and 580 is performed.

  Further, the control unit 500 outputs a control signal to the two-screen composition unit 590 to control the image composition of the two-screen composition unit 590.

  The two-screen composition unit 590 synthesizes the processed image signals So1 and So2 output from the signal processing units 570 and 580 based on the control signal of the control unit 500.

  The storage unit 510 includes a ROM that stores control programs, fixed data, and the like, and a semiconductor memory such as a RAM that is a working storage area of the microprocessor. Further, the external memory may be provided with a storage medium such as an SD card or HDD. The ROM is a read-only semiconductor memory that stores fixed data such as a program and display control data required when the control unit 500 operates. The RAM is used as a so-called working memory that temporarily stores data related to the image quality correction processing, calculation results, and the like. A program processed by the display device 100 is developed and executed in this RAM. Further, a part of the RAM is composed of an electrically erasable programmable ROM (EEPROM) which is an electrically rewritable nonvolatile memory, and various specifications in the display device 100 can be changed by changing a program written in the EEPROM. Can do.

  The storage unit 510 stores a table of light receiving sensor values, pixel positions, and gain correction coefficients as data related to the reflected image quality correction processing.

  6 to 11 are diagrams illustrating an example of setting storage information stored in the storage unit 510. A part of the setting storage information is stored as a lookup table.

  FIG. 6 is a diagram showing setting storage information of an image displayed on the display. The selected images include a selected image 1 and a selected image 2, and there are CD / DVD playback, TV1, TV2, and external signal input as image sources to be displayed on the display panel 110 in two screens.

  FIG. 7 is a diagram showing the setting storage information of the display output setting displayed on the display. The display output setting selects any one of the selected image 1, the selected image 2, the selected image 1 and the selected image 2, the selected image 2 and the selected image 1. By this display output setting, the selected image 1 and the selected image 2 are set individually or in combination.

  FIG. 8 is a diagram showing the setting storage information of the screen viewer position setting. In the screen viewer position setting, any one of the plurality of viewer positions is set for each display screen, and the one-screen display viewer position, the screen 1 viewer position, and the screen 2 viewer are viewed. Person position is set. The one-screen display viewer position setting is a setting of the target viewer position during one-screen display. Screen 1 viewer position setting is the setting of the target viewer position of screen 1 when displaying two screens. Screen 2 viewer position setting is the setting of the target viewer position of screen 2 when displaying two screens. It is. In each screen viewer position setting, a right seat viewer, a left seat viewer, or a front viewer is set from a remote controller, an escutcheon button, or a front seat navigation (driver's seat navigation device).

  FIG. 9 is a diagram showing setting storage information of image quality adjustment settings. The image quality adjustment settings include a display image quality adjustment setting for adjusting the image quality according to the display characteristics, a one-screen image quality adjustment setting for adjusting the image quality according to the reflection depending on the display position, a screen 1 image quality adjustment setting, and a screen. It is divided into two image quality adjustment settings. The display image quality adjustment setting adjusts the image quality characteristics of the display itself and is rarely reset. On the other hand, the image quality adjustment setting for the one-screen display for setting the image quality adjustment value for the one-screen display, the screen one image quality adjustment setting for setting the image quality adjustment value for the screen one for the two-screen display, and the two-screen display. The screen 2 image quality adjustment setting for setting the image quality adjustment value of the screen 2 is appropriately set according to the viewer position or external light information. The display image quality adjustment setting sets correction information for contrast, brightness, color, hue, and gamma, and the one-screen display image quality adjustment setting, screen 1 image quality adjustment setting, and screen 2 image quality adjustment setting further include DCC. Set the set value.

  FIG. 10 is a diagram illustrating an example of a viewer angle table. As shown in FIG. 10, the right seat position is 40 ° when viewed from the front of the display panel 110, the front seat is 0 °, and the left seat position is −40 ° as the viewer angle. For example, when the viewer sits on the left seat of the rear seat 200, the viewer angle is set to −40 °, and when the viewer sits on the right seat, the viewer angle is set to 40 °. Also, if one viewer sits in the center of the seat, two or more viewers sit in the left and right seats of the rear seat 200, or one viewer sits in the center of the seat, the viewer An angle of 0 ° is set.

  FIG. 11 is a diagram illustrating an example of the external light correction intensity table. As shown in FIG. 11, correction intensity values 0, 1.2,..., 299, 300 corresponding to the respective bits of the light receiving element information 0 to 255 are set.

  Hereinafter, the operation of the display device configured as described above will be described.

  FIG. 12 is a diagram illustrating an external light correction method according to the viewing angle.

  In FIG. 12, the area of the display 600 is divided into two areas A and B, and the external light intensity is measured at the representative points C and D. Reference numeral 700 denotes a viewer position. The representative points C and D are, for example, the center points of the display areas A and B.

  Based on the measured external light intensity and the external light correction intensity table shown in FIG. 11, the intensity of the display area A is corrected using the correction intensity value obtained from the representative point C, and the correction intensity obtained from the representative point D. The intensity of the display area B is corrected using the value. In this embodiment, as shown in FIGS. 1 and 2, light receiving sensors 111 and 112 and light receiving sensors 113 and 114, which are external light intensity detecting means, are installed at two places on the lower side of the display panel 110. . The viewer position is detected by seating sensors 301 and 302 which are viewer position detecting means.

  The number of divisions of the area of the display 600 is not limited to 2, and may be 3 or more. Further, the representative points C and D where the external light intensity detecting means is installed may not be the center point of each display area. Also in the case of single screen display, the screen area may be divided into A and B (or more), and external light correction intensity may be given to each area.

Here, when there are a plurality of viewers, one of the following processes is selected.
(1) The display process corresponding to the viewing angle is turned off.
(2) When two viewers are seated at a symmetrical position from the center of the display, the average of each external light sensor is taken and this average value is used.
(3) The main or representative viewer position is input or set in advance to match the viewer position.
(4) When a plurality of screens are displayed and the viewers of each screen are set, optimal correction is performed for each of the plurality of viewers for each screen.

  FIG. 13 is a schematic view of the display device installed at the rear of the vehicle as viewed from above when the correction method of FIG. 12 is applied to a plurality of viewers. The same components as those in FIG. 2 are denoted by the same reference numerals.

  As shown in FIG. 13, a plurality of light receiving sensors 111 and 112 and light receiving sensors 113 and 114 for detecting external light in the viewer direction are installed corresponding to the viewer position and the two-screen display. The correction is performed for each screen based on the detection information of .about.114.

  The light receiving sensor 111 receives the reflected light of the screen 1 to the left seat, the light receiving sensor 112 receives the reflected light of the screen 1 to the right seat, and the light receiving sensor 113 receives the reflected light of the screen 2 to the left seat. Reference numeral 114 denotes an external light sensor that estimates the reflected light of the screen 2 to the right seat.

  Further, the seating sensors 301 and 302 detect the viewer position.

  FIG. 14 and FIG. 15 are flowcharts showing a program for correcting the reflection image quality at the display position, which is executed by the microprocessor constituting the control unit 500. In the figure, S indicates each step of the flow.

  First, the control unit 500 refers to the display output setting (FIG. 7) stored in the storage unit 510 in step S1, and determines the display output setting referred to in step S2. The display output setting includes selection image 1, selection image 2, selection image 1 and selection image 2, selection image 2 and selection image 1, and control unit 500 determines which one is set. The selected images 1 and 2 are, for example, CD / DVD playback, TV1, TV2, and external signal input.

  When one image source (selected image 1 or selected image 2) is set in step S2, and when a combination of two image sources (such as selected image 1 and selected image 2) is set, The processing of is very different.

  When the selection image 1 or the selection image 2 is set by the display output setting, the control unit 500 displays the screen 1 for the screen viewer position setting (FIG. 8) stored in the storage unit 510 in step S3. The viewer position setting is referred to, and the screen viewer position setting of the screen viewer position setting is referred to in step S4. Screen 1 viewer position setting is the setting of the target viewer position of screen 1 when displaying two screens. Screen 2 viewer position setting is the setting of the target viewer position of screen 2 when displaying two screens. It is. In the screen 1 and screen 2 viewer position setting, the control unit 500 sets whether the target viewer is the right seat viewer, the left seat viewer, or the front viewer. This screen viewer position setting is set by the operation of the driver by the front seat navigation, in addition to the operation of the remote controller and the escutcheon button by the operation unit 120.

  In step S5, the control unit 500 determines whether the target viewer based on the screen 1 viewer position setting is any one of the right seat viewer, the left seat viewer, and the front viewer. . When the target viewer according to the screen 1 viewer position setting is the left seat viewer, the control unit 500 refers to the viewer angle table (FIG. 10) in step S6. The person angle -40 ° is set, and the screen 1 left seat outside light information L1 is acquired in step S7. Specifically, the control unit 500 acquires the external light information Ig1 from the screen 1 left viewer external light receiving unit 530. Next, the controller 500 sets the screen 1 left seat outside light information L1 acquired in step S8 to the correction intensity (control target value) G (G = L1), and proceeds to step S16.

  When the target viewer based on the screen 1 viewer position setting is the right seat viewer in step S5, the control unit 500 refers to the viewer angle table (FIG. 10) in step S9. In this case, the viewer angle is set to 40 °, and the screen 1 right seat outside light information R1 is acquired in step S10. Specifically, the control unit 500 acquires the external light information Ig2 from the screen 1 right viewer external light receiving unit 540. Next, the control unit 500 sets the screen 1 right seat outside light information R1 acquired in step S11 to the correction intensity (control target value) G (G = R1), and proceeds to step S16.

  Further, when the target viewer based on the screen 1 viewer position setting is the front viewer in step S5, the control unit 500 refers to the viewer angle table (FIG. 10) in step S12. In this case, a viewer angle of 0 ° is set. Next, the control unit 500 acquires screen 1 left seat outside light information L1 in step S13, and screen 1 right seat outside light information R1 in step S14. Next, the control unit 500 sets a correction intensity (control target value) G according to the following equation (2) based on the screen 1 left seat outside light information L1 and the screen 1 right seat outside light information R1 acquired in step S15. Then, the process proceeds to step S16.

G = (L1 + R1) / 2 (2)
In step S16, the control unit 500 sets a correction intensity corresponding to G with reference to the external light correction intensity table (FIG. 11), and acquires luminance information of the image on the screen 1 in step S17.

  Next, the control unit 500 corrects the contrast, brightness, color, hue, sharpness, and / or gamma of the screen 1 based on the correction intensity G set in step S18 and the acquired luminance information, and step S19 (FIG. 15). Proceed to Here, with regard to image quality correction according to the reflection, a combination of parameters that are most effective for reflection and that do not impair the image quality as much as possible among contrast, brightness, color, hue, sharpness, and gamma, and the amount of correction are set in advance. It is calculated by experiments.

  In step S19, the control unit 500 determines whether the target viewer based on the screen 2 viewer position setting is any one of the right seat viewer, the left seat viewer, and the front viewer. . When the target viewer according to the screen 2 viewer position setting is the left seat viewer, the control unit 500 refers to the viewer angle table (FIG. 10) in step S20, and in this case, the viewer is viewing. The person angle -40 ° is set, and the screen 2 left seat outside light information L2 is acquired in step S21. Specifically, the control unit 500 acquires the external light information Ig3 from the screen 2 left viewer external light receiving unit 550. Next, the control unit 500 sets the screen 2 left seat outside light information L2 acquired in step S22 to the correction intensity (control target value) G (G = L2), and proceeds to step S30.

  Further, when the target viewer based on the screen 2 viewer position setting is the right seat viewer in step S19, the control unit 500 refers to the viewer angle table (FIG. 10) in step S23. In this case, a viewer angle of 40 ° is set, and screen 2 right seat outside light information R2 is acquired in step S24. Specifically, the control unit 500 acquires the external light information Ig4 from the external light receiving unit 560 for the right viewer for the screen 2. Next, the control unit 500 sets the screen 2 right seat outside light information R2 acquired in step S25 to the correction intensity (control target value) G (G = R2), and proceeds to step S30.

  Further, when the target viewer based on the screen 2 viewer position setting is the front viewer in step S19, the control unit 500 refers to the viewer angle table (FIG. 10) in step S26. In this case, a viewer angle of 0 ° is set. Next, the control unit 500 acquires screen 2 left seat outside light information L2 in step S27, and acquires screen 2 right seat outside light information R2 in step S28. Next, the control unit 500 sets the correction intensity (control target value) G according to the following equation (3) based on the screen 2 left seat outside light information L2 and the screen 2 right seat outside light information R2 acquired in step S29. Then, the process proceeds to step S30.

G = (L2 + R2) / 2 (3)
In step S30, the control unit 500 sets a correction intensity corresponding to G with reference to the external light correction intensity table (FIG. 11), and acquires luminance information of the image on the screen 2 in step S31.

  Next, the control unit 500 corrects the contrast, brightness, color, hue, sharpness, and / or gamma of the screen 2 based on the correction intensity G set in step S32 and the acquired luminance information, and ends this flow.

  The above is the processing when the selected image 1 or the selected image 2 is set by the display output setting.

  On the other hand, if a combination of two image sources (selected image 1 and selected image 2 or selected image 2 and selected image 1) is set in step S2, the control unit 500 stores the combination in the storage unit 510 in step S33. With reference to the one-screen display viewer position setting in the stored screen viewer position setting (FIG. 8), in step S34, the target viewer according to the one-screen display viewer position setting determines the right seat viewing. It is discriminate | determined whether it is any one among a person, a left seat viewer, and a front viewer. When the target viewer based on the one-screen display viewer position setting is the left seat viewer, the control unit 500 refers to the viewer angle table (FIG. 10) in step S35. The viewer angle is set to −40 °, the screen 1 left seat outside light information L1 is acquired in step S36, the screen 2 left seat outside light information L2 is acquired in step S37, and the screen 1 acquired in step S38. Based on the left seat outside light information L1 and the screen 2 left seat outside light information L2, the correction intensity (control target value) G is set according to the following equation (4), and the process proceeds to step S49.

G = (L1 + L2) / 2 (4)
When the target viewer based on the one-screen display viewer position setting is the right seat viewer in step S34, the control unit 500 refers to the viewer angle table (FIG. 10) in step S39. In this case, the viewer angle is set to 40 °, the screen 1 right seat outside light information R1 is obtained in step S40, the screen 2 right seat outside light information R2 is obtained in step S41, and step S42. The correction intensity (control target value) G is set according to the following equation (5) based on the screen 1 right seat outside light information R1 and the screen 2 right seat outside light information R2 acquired in step S49, and the process proceeds to step S49.

G = (R1 + R2) / 2 (5)
When the target viewer based on the one-screen display viewer position setting is a front viewer in step S34, the control unit 500 refers to the viewer angle table (FIG. 10) in step S43. In this case, the viewer angle is set to 0 °, the screen 1 left seat outside light information L1 is obtained in step S44, and the screen 1 right seat outside light information R1 is obtained in step S45. Next, the control unit 500 obtains screen 2 left seat outside light information L2 in step S46, and obtains screen 2 right seat outside light information R2 in step S47. Next, the controller 500 obtains the screen 1 left seat outside light information L1, the screen 1 right seat outside light information R1, the screen 2 left seat outside light information L2, and the screen 2 right seat outside light acquired in step S48. Based on the information R2, the correction strength (control target value) G is set according to the following equation (6), and the process proceeds to step S49.

G = (R1 + R2 + L1 + L2) / 4 (6)
In step S49, the control unit 500 sets a correction intensity corresponding to G with reference to the external light correction intensity table (FIG. 11), and acquires luminance information of the image in step S50.

  Next, the control unit 500 corrects the contrast, brightness, color, hue, sharpness, and / or gamma of the entire screen based on the correction intensity G set in step S51 and the acquired luminance information, and ends this flow. .

  As described above, according to the present embodiment, the display device 100 is installed in the vehicle interior of the vehicle and includes the display panel 110 that displays an image on the display screen and the seating sensors 301 and 302, and the detected viewer. A viewer position receiving unit 520 that outputs position information, and a viewer external light receiving unit 540 to 560 that outputs a sensor value indicating the amount of reflected light from the screen for each viewer from the light receiving sensors 111 to 114. And a storage unit 510 that stores a table of sensor values, pixel positions, gain correction coefficients, and other various types of information regarding the image quality correction processing for reflection, and the control unit 500 reads information from each of the receiving units 520 to 560 and Based on the image feature amount information (luminance) Ic1 and Ic2 from the signal processing units 570 and 580, the information in the storage unit 510 (particularly, the setting storage information for the screen viewer position setting shown in FIG. 8) is referred to. The image processing parameters Vc1 and Vc2 are output by performing a process of correcting the image quality according to the reflection by the display position, and the signal processing units 570 and 580 are based on the image processing parameters Vc1 and Vc that have been subjected to the reflection image quality correction. Since the image quality adjustment of the image signals Si1 and Si2 is performed on the display device 100 for in-vehicle use in which the display is horizontally long and the sight is close, such as a viewer sitting in the back seat of the vehicle, external light Therefore, the visibility of each viewer can be improved.

  For example, as shown in FIG. 13, the viewers A and B are seated on the rear seat 200 of the vehicle, the viewer A watches the TV on the screen 1, and the viewer B watches the DVD on the screen 2. Taking as an example a case where sunlight enters from the left side of the vehicle and is reflected by the display panel 110. In this case, it is the viewer B that is strongly influenced by the reflected light, and the viewer A is less affected by the reflected light than the viewer B. The display panel 110 is provided with light receiving sensors 111 and 112 for the left seat and right seat 113 and 114 for the right seat corresponding to the screens 1 and 2, respectively. 1. A value indicating the amount of reflected light from the screen 2 is detected, and the control unit 500 corrects the image quality (for example, contrast) of the screens 1 and 2 of the display panel 110 based on the sensor values for the screens 1 and 2. , Bright, color, etc.). Now, assuming that the viewer's viewing screen is set by the selected image setting, and the image quality correction of the screens 1 and 2 is set by the two-screen display setting, the viewer A who is watching the screen 1 Is originally unaffected by the reflected light, and the viewer B who is viewing the screen 2 has a small amount of reflected light from the screen 2 being viewed, although there is reflected light from the screen 1. Therefore, the image quality correction of the screen 1 viewed by the viewer A is not performed, and the image quality correction of the screen 2 viewed by the viewer B is not performed. Since the image quality correction is not performed, that is, the image quality adjustment setting value (including the default value) preset by the viewer is applied as it is, a good image quality is maintained. The above is an example, and image quality correction for the screens 1 and 2 is performed depending on the display output setting. For example, when viewing the screen 2 and the screen 1 by the display output setting, the image quality correction is performed on the screen 1, and the viewer B views the screen 1 in which the influence of the reflection is reduced. Can be seen. The effect will be clear if the above is compared with the conventional example shown in FIG.

  As described above, according to the present embodiment, the reflection of external light to the viewer is detected, and the image quality is corrected based on this reflection information. In the horizontally long display panel 110 that is likely to occur, the influence of reflection of external light can be reduced in accordance with the viewing of the viewer, and the image quality of the entire screen can be kept good.

  In this embodiment, since the viewer can set the image quality adjustment setting, the screen viewer position setting, and the like through the operation unit 120, an optimal image is displayed according to the viewer's request. can do. Further, since the position of the viewer seated on the rear seat is detected by the seating sensors 301 and 302, the image quality can be corrected according to the optimal reflection according to the position of the viewer, and the display In the display panel 110 that is horizontally long and close to the sight, reflection can be appropriately corrected on the left and right sides of the display. This is particularly effective when displaying two screens. Therefore, it is possible to reduce the influence of reflection as much as possible for a plurality of viewers, and to realize a display device that is easy to view.

  Furthermore, in this embodiment, image quality correction is performed according to the reflection, but it is also possible to adjust the brightness of the backlight of the display panel 110 using a control amount obtained by a similar method. . If the display device uses a white LED backlight pack as the light source of the backlight, the luminance can be adjusted on the left and right of the landscape display.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. For example, (1) when performing image quality correction in accordance with the reflection, a specific display mode is set in advance, and the display mode is read out and reflected in the image quality correction processing. Only the means for performing the image quality correction, (3) the means for correcting the image quality for each screen, and (4) the means for turning off the image quality correction processing may be introduced as an expanded configuration.

  Further, in the present embodiment, an example in which the present invention is applied to a display device that is viewed from the rear seat of the vehicle is described, but it may be mounted on another similar vehicle. In addition to the passenger compartment, the present invention can be applied to any display device as long as it is installed in a space in which external light is anxious.

  The configuration examples in FIGS. 1 and 2 are examples, and any configuration, for example, the number of seats and the number of image inputs may be three or more.

  In the present embodiment, the name “display device” is used. However, this is for convenience of explanation, and it is needless to say that the display device may be a vehicle-mounted display device, a vehicle-mounted electronic device, or the like.

  Further, the type, number, connection method, and the like of each circuit unit constituting the display device, for example, the signal processing unit, are not limited to the above-described embodiment.

  The display device described above is also realized by a program for causing the display device to function. This program is stored in a computer-readable recording medium.

  The display device according to the present invention is useful as an in-vehicle display device installed in a vehicle cabin. In addition, since it is possible to perform setting based on the viewer position and image quality adjustment setting operation during one-screen and two-screen display, it is useful for convenience. Further, it can be applied to applications such as products having a plurality of display devices including a display unit and an operation unit. Moreover, it is suitable for a display device installed in a space where visibility is deteriorated by outside light other than the passenger compartment.

The front view which shows the external appearance structure of the display apparatus which concerns on embodiment of this invention The schematic diagram which looked at the display apparatus which concerns on the said embodiment from upper direction The figure which shows the specific structure of the light reception sensor of the display apparatus which concerns on the said embodiment. The figure which shows the correspondence of the light receiving element voltage of the light receiving sensor of the display apparatus which concerns on the said embodiment, and reflection reflection luminance. The block diagram which shows the structure of the display apparatus which concerns on the said embodiment The figure which shows the setting storage information of the image displayed on the display of the display apparatus which concerns on the said embodiment. The figure which shows the setting storage information of the display output setting displayed on the display of the display apparatus which concerns on the said embodiment. The figure which shows the setting storage information of the screen viewer position setting of the display apparatus which concerns on the said embodiment. The figure which shows the setting storage information of the image quality adjustment setting of the display apparatus which concerns on the said embodiment. The figure which shows an example of the viewer angle table of the display apparatus which concerns on the said embodiment. The figure which shows an example of the external light correction intensity | strength table of the display apparatus which concerns on the said embodiment. The figure explaining the external light correction method according to the viewing angle of the display apparatus which concerns on the said embodiment The schematic diagram which looked at the display apparatus installed in the rear part of the vehicle when applying the correction method of FIG. 12 to a plurality of viewers from above The flowchart which shows the program of the reflection image quality correction process of the display position of the display apparatus which concerns on the said embodiment The flowchart which shows the program of the reflection image quality correction process of the display position of the display apparatus which concerns on the said embodiment The figure explaining the example of a display of the display apparatus which can display a several image in the vehicle interior of the conventional vehicle The figure explaining the example of a display of the display apparatus which changes illumination intensity with the conventional external light sensor

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Display apparatus 101 Image input terminal 102 Image input terminal 110 Display panel 111-114 Light receiving sensor (external light sensor)
115 sensor unit 116 phototransistor 117 filter 120 operation unit 200 rear seat 301, 302 seating sensor 500 control unit 510 storage unit 520 viewer position receiving unit 530 screen 1 left light external light receiving unit 540 screen 1 right viewing Outside light receiving unit for viewer 550 Screen 2 Outside light receiving unit for left viewer 560 Outside light receiving unit for screen 2 right viewer 570, 580 Signal processing unit 590 Two screen combining unit

Claims (5)

Display means for displaying an image on a display screen;
Viewer position reading means for reading the relative position of the display screen and the viewer;
Reflection detection means for detecting reflected light of outside light with respect to the viewer;
A display device comprising: an image quality correction unit that corrects an image quality of the display unit based on the reflection information. The display screen is a plurality of screens,
The display device according to claim 1, wherein the viewer position reading unit reads a relative position between at least one of the plurality of screens and the viewer. The viewer position reading means reads the positions of a plurality of viewers viewing the image on the display screen,
The display device according to claim 1, wherein the reflection detection unit detects reflection of external light with respect to the plurality of viewers.   The display device according to claim 1, wherein the image quality correction unit corrects at least one image quality adjustment parameter among contrast, brightness, color, hue, color gain, sharpness, and gamma. Display means for displaying at least one image on the screen;
Light detection means for individually detecting the amount of reflected light from the representative position of the screen to a plurality of viewing positions;
Storage means for storing setting storage information in which any of the plurality of viewing positions is set for each screen of the display means;
From a plurality of detection values detected by the light detection means, a predetermined one is selected based on setting storage information of the storage means, and an image displayed on the screen of the display means is selected based on the selected detection value. And a correction unit that corrects the image quality.

Images