DISPLAY APPARATUS AND CONTROL METHOD THEREOF

• US 20140160175A1
• Filed: 12/04/2013
• Published: 06/12/2014
• Est. Priority Date: 12/11/2012
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Uemura, Kiyohiro
• Application Number:
  US14/096,768
• Publication Number:
  US 20140160175A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G02B 26/02 for controlling the intensity of light G02B26/004 takes precedence
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2360/141 the light conveying information used for selecting or modulating the light emitting or modulating element
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3433 using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices using liquid crystal devices G09G3/36; using electrochromic devices G09G3/38
• CPC Class Codes: H04N 5/58 in dependence upon ambient light

Abstract

A display apparatus according to the present invention includes: a backlight; a display panel configured to transmit light from the backlight at a transmittance based on an input image signal; a backlight sensor configured to detect light from the backlight; a external light sensor configured to detect external light of the display apparatus; and a control unit configured to control an amount of luminescence of the backlight based on a detection value of the backlight sensor and a detection value of the external light sensor.

Claims

1. A display apparatus including a backlight and a display panel configured to transmit light from the backlight at a transmittance based on an input image signal,

the display apparatus comprising:

a backlight sensor configured to detect light from the backlight;

a external light sensor configured to detect external light of the display apparatus; and

a control unit configured to control an amount of luminescence of the backlight based on a detection value of the backlight sensor and a detection value of the external light sensor.

2. The display apparatus according to claim 1, further comprising a correcting unit configured to correct a detection value of the backlight sensor based on a detection value of the external light sensor, wherein

the control unit controls the amount of luminescence of the backlight based on the detection value after correction by the correcting unit.

3. The display apparatus according to claim 2, further comprising a transmitted external light value determining unit configured to determine a transmitted external light value, which is a value of external light after being transmitted into the display apparatus, based on the input image signal and a detection value of the external light sensor, wherein

the correcting unit corrects the detection value of the backlight sensor based on the transmitted external light value determined by the transmitted external light value determining unit.

4. The display apparatus according to claim 3, further comprising a external light transmittance determining unit configured to determine a external light transmittance, which is a transmittance when the external light transmits through the display panel, based on the input image signal, wherein

the transmitted external light value determining unit determines a transmitted external light value based on the external light transmittance determined by the external light transmittance determining unit and the detection value of the external light sensor.

5. The display apparatus according to claim 4, wherein

the transmitted external light value determined by the transmitted external light value determining unit is a value acquired by multiplying the external light transmittance determined by the external light transmittance unit determining by the detection value of the external light sensor.

6. The display apparatus according to claim 4, wherein

the external light transmittance determining unit determines, for each pixel of the display panel, based on the input image signal, a transmittance when the external light transmits through the pixel, as a pixel external light transmittance, and determines a representative value of the pixel external light transmittance of each pixel as the external light transmittance.

7. The display apparatus according to claim 6, wherein

the external light transmittance determining unit determines, as the external light transmittance, a representative value of pixel external light transmittances of pixels located within a predetermined range from the backlight sensor on a surface in parallel with a screen, among a plurality of pixels of the display panel.

8. The display apparatus according to claim 4, wherein

the pixel external light transmittance determined by the external light transmittance determining unit is a value acquired by multiplying a utilization efficiency of light from the backlight of the display panel by an aperture ratio of a pixel corresponding to the pixel external light transmittance.

9. The display apparatus according to claim 3, further comprising an influence quantity determining unit configured to determine influence quantity of external light on a detection value of the backlight sensor based on the transmitted external light value determined by the transmitted external light value determining unit, wherein

the correcting unit corrects the detection value of the backlight sensor based on the influence quantity determined by the influence quantity determining unit.

10. The display apparatus according to claim 9, wherein

the influence quantity determined by the influence quantity determining unit is a value acquired by converting the transmitted external light value determined by the transmitted external light value determining unit into the detection value of the backlight sensor.

11. A method of controlling a display apparatus including a backlight, a display panel configured to transmit light from the backlight at the transmittance based on an input image signal, a backlight sensor configured to detect light from the backlight, and a external light sensor configured to detect external light of the display apparatus,

the method comprising:

acquiring a detection value of the backlight sensor and a detection value of the external light sensor; and

controlling an amount of luminescence of the backlight based on the detection value of the backlight sensor and the detection value of the external light sensor.

12. A display apparatus including a backlight and a display panel configured to transmit light from the backlight at a transmittance based on an input image signal,

the display apparatus comprising:

a backlight sensor configured to detect light from the backlight;

a external light sensor configured to detect external light of the display apparatus; and

a correcting unit configured to correct a detection value of the backlight sensor based on a detection value of the external light sensor.

13. A method of controlling a display apparatus including a backlight, a display panel configured to transmit light from the backlight at a transmittance based on an input image signal, a backlight sensor configured to detect light from the backlight, and a external light sensor configured to detect external light of the display apparatus,

the method comprising:

acquiring a detection value of the backlight sensor and a detection value of the external light sensor; and

correcting the detection value of the backlight sensor based on the detection value of the external light sensor.