Light source apparatus, image display apparatus and control method for light source apparatus

Patent metadata

Field	Value
Publication number	US-2016284283-A1
Application number	US-201615078145-A
Country	US
Kind code	A1
Filing date	Mar 23, 2016
Priority date	Mar 26, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

A light source apparatus includes: a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; a setting unit configured to set a drive mode; and a control unit configured to drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, by a drive method corresponding to the drive mode set by the setting unit, wherein in a case where the light-emitting unit is lit with a predetermined light emission brightness, in a light-emitting diode from among the plurality of light-emitting diodes, a drive current value during a lighting period is lower and a lighting period during one cycle is longer in a second drive mode than those in a first drive mode.

First claim

What is claimed is:

1 . A light source apparatus, comprising:
a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; a setting unit configured to set any of a plurality of drive modes including a first drive mode and a second drive mode having mutually different drive methods for the light-emitting unit; and a control unit configured to drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, by a drive method corresponding to the drive mode set by the setting unit, wherein in a case where the light-emitting unit is lit with a predetermined light emission brightness, in a light-emitting diode from among the plurality of light-emitting diodes, a drive current value during a lighting period is lower and a lighting period during one cycle is longer in the second drive mode than those in the first drive mode.

2 . The light source apparatus according to claim 1 , wherein
the first drive mode is a drive mode which changes at least one of the light emission brightness and the light emission color of the light-emitting unit in accordance with input image data; and the second drive mode is a drive mode which does not change the light emission brightness and the light emission color of the light-emitting unit in accordance with the input image data.

3 . The light source apparatus according to claim 2 , wherein
the light-emitting unit has the plurality of light-emitting diodes respectively for a plurality of partial regions in a region of a light-emitting surface of the light-emitting unit; the first drive mode is a drive mode which individually changes at least one of the light emission brightness and the light emission color of the light-emitting unit, in each of the plurality of partial regions; and the second drive mode is a drive mode which makes the light emission brightness and the light emission color of the light-emitting unit substantially coincide between the plurality of partial regions.

4 . The light source apparatus according to claim 2 , wherein the second drive mode is a drive mode which causes the light-emitting unit to emit light with a light emission brightness that is higher than an upper limit of the light emission brightness of the light-emitting unit in a case where the first drive mode is set.

5 . The light source apparatus according to claim 1 , wherein
the plurality of light-emitting diodes include a G-LED which is a light-emitting diode that emits green light; and in a case where assumption is made that the G-LED is driven such that the light emission brightness of the G-LED substantially coincides between the first drive mode and the second drive mode, the current supplied to the G-LED in the lighting period of the G-LED is lower, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer in the second drive mode than those in the first drive mode.

6 . The light source apparatus according to claim 5 , wherein
the plurality of light-emitting diodes further include a B-LED which is a light-emitting diode that emits blue light; and in a case where assumption is made that the B-LED is driven such that the light emission brightness of the B-LED substantially coincides between the first drive mode and the second drive mode, the current supplied to the B-LED in the lighting period of the B-LED is lower, and the lighting period of the B-LED in one cycle of light emission of the B-LED is longer in the second drive mode than those in the first drive mode.

7 . The light source apparatus according to claim 5 , wherein the G-LED is a gallium nitride type semiconductor LED.

8 . The light source apparatus according to claim 5 , wherein light emission efficiency of the G-LED is lower than light emission efficiency of other light-emitting diodes included in the plurality of light-emitting diodes.

9 . The light source apparatus according to claim 6 , wherein the B-LED is a gallium nitride type semiconductor LED.

10 . The light source apparatus according to claim 1 , wherein the light emission brightness of the light-emitting unit can be changed by adjusting at least one of a pulse width and a pulse amplitude of a pulse signal of a current that is supplied to the light-emitting diode.

11 . The light source apparatus according to claim 1 , wherein, in a case where the light-emitting unit is lit with a predetermined light emission brightness, the drive current value in the lighting period and the lighting period in one cycle, in the second mode, are equal to those in the first drive mode, in the light-emitting diodes other than the light-emitting diode from among the plurality of light-emitting diodes.

12 . An image display apparatus, comprising:
a light source apparatus; and a display unit configured to display an image on a screen by modulating light from the light source apparatus on the basis of input image data, wherein the light source apparatus comprises
a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors,
a setting unit configured to set any of a plurality of drive modes including a first drive mode and a second drive mode having mutually different drive methods for the light-emitting unit, and
a control unit configured to drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, by a drive method corresponding to the drive mode set by the setting unit; and
in a case where the light-emitting unit is lit with a predetermined light emission brightness, in a light-emitting diode from among the plurality of light-emitting diodes, a drive current value during a lighting period is lower and a lighting period during one cycle is longer in the second drive mode than those in the first drive mode.

13 . The image display apparatus according to claim 12 , wherein the setting unit sets any of the plurality of drive modes in accordance with input image data.

14 . The image display apparatus according to claim 12 , wherein the setting unit sets any of the plurality of drive modes in accordance with a user operation.

15 . The image display apparatus according to claim 14 , wherein the user operation is a user operation that is different from a user operation for selecting of the plurality of drive modes.

16 . A control method for a light source apparatus including a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors, comprising:
setting any of a plurality of drive modes including a first drive mode and a second drive mode having mutually different drive methods for the light-emitting unit; and driving the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, by a drive method corresponding to the drive mode set by the setting, wherein in a case where the light-emitting unit is lit with a predetermined light emission brightness, in a light-emitting diode from among the plurality of light-emitting diodes, a drive current value during a lighting period is lower and a lighting period during one cycle is longer in the second drive mode than those in the first drive mode.

17 . A non-transitory computer readable medium that stores a program, wherein
the program causes a computer to execute a control method for a light source apparatus including a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; th

Assignees

• Canon Kk

Inventors

• Kurita Masanao

Classifications

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/3426

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• G09G3/2081

  with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066) · CPC title

• G09G3/3413 Primary

  Details of control of colour illumination sources · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title