Signal generation apparatus, signal generation program, signal generation method, and image display apparatus

Patent metadata

Field	Value
Publication number	US-9569999-B2
Application number	US-201414508720-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	Nov 11, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

There is provided a signal generation apparatus for generating an output video signal based on an input video signal provided corresponding to an image to be displayed, the output video signal being a signal for driving an image display section including a display area, the display area including a plurality of pixels arranged in a two-dimensional matrix. At a change of the input video signal from low-brightness display to high-brightness display for a portion of the display area including one or more of the pixels, during a period for the signal change, the output video signal being generated for each of the one or more of the pixels in the portion of the display area to obtain a higher brightness than usual for the portion of the display area.

First claim

What is claimed is:

1. A signal generation apparatus comprising:
a signal generating section, wherein the signal generating section generates an output video signal based on an input video signal provided corresponding to an image to be displayed, the output video signal being a signal for driving an image display section including a display area, the display area including a plurality of pixels arranged in a two-dimensional matrix,
wherein at a change of the input video signal from low-brightness display to high-brightness display for a portion of the display area including one or more of the pixels, during a period for the signal change, generating the output video signal for each of the one or more of the pixels in the portion of the display area obtains an increased brightness for the portion of the display area,
a video signal sum calculation section, wherein the video signal sum calculation section determines a sum value of the input video signal, the sum value being obtained by summing a sum step value in a time axis direction, the sum step value being provided corresponding to a value of the input video signal, and
a video signal level control section, wherein the video signal level control section determines a value of the output video signal by multiplying the sum value of the input video signal by a gain value, and during the period for the signal change, the gain value is increased for multiplication of the value of the input video signal provided to each of the one or more of the pixels in the portion of the display area,
wherein the gain value for multiplication of the value of the input video signal varies based on the sum value.

2. The signal generation apparatus according to claim 1 , wherein
the portion of the display area includes one pixel, and the signal change from low-brightness display to high-brightness display is detected based on the input video signal for the pixel.

3. The signal generation apparatus according to claim 1 , wherein
the portion of the display area includes a plurality of pixels, and the signal change from low-brightness display to high-brightness display is detected based on the input video signal for a part of the plurality of pixels.

4. The signal generation apparatus according to claim 3 , wherein
the signal change from low-brightness display to high-brightness display is detected based on an average of the input video signals for the part of the plurality of pixels.

5. The signal generation apparatus according to claim 1 , wherein
the input video signal includes first, second, and third input video signals, the first input video signal being for displaying a first primary color, the second input video signal being for displaying a second primary color, the third input video signal being for displaying a third primary color, and
the first, second, and third input video signals are each multiplied by the same gain value to generate first, second, and third output video signals as the output video signals, the first output video signal being for driving a first subpixel displaying the first primary color, the second output video signal being for driving a second subpixel displaying the second primary color, and the third output video signal being for driving a third subpixel displaying the third primary color.

6. The signal generation apparatus according to claim 1 , wherein
the sum step value varies to be the smallest when the value of the input video signal is for image display with the lowest brightness, and to be the largest when the value of the input video signal is for image display with the highest brightness.

7. The signal generation apparatus according to claim 1 , wherein
when the sum step value is a predetermined value or smaller, the sum value is reset.

8. A non-transitory computer readable medium storing a signal generation program that is executable by a processor to perform operations comprising:
generating an output video signal via a signal generation section, based on an input video signal provided corresponding to an image to be displayed, the output video signal being a signal for driving an image display section including a display area, the display area including a plurality of pixels arranged in a two-dimensional matrix, and
at a change of the input video signal from low-brightness display to high-brightness display for a portion of the display area including one or more of the pixels, during a period for the signal change, generating the output video signal for each of the one or more of the pixels in the portion of the display area to obtain an increased brightness for the portion of the display area,
calculating a sum value of the input video signal, via a video signal sum calculation section, the sum value being obtained by summing a sum step value in a time axis direction, the sum step value being provided corresponding to a value of the input video signal,
calculating a value of the output video signal, via a video signal level control section, by multiplying the sum value of the input video signal by a gain value, and during the period for the signal change, the gain value increases for multiplication of the value of the input video signal provided to each of the one or more of the pixels in the portion of the display area,
wherein the gain value for multiplication of the value of the input video signal varies based on the sum value.

9. A signal generation method including:
generating an output video signal via a signal generation section, based on an input video signal provided corresponding to an image to be displayed, the output video signal being a signal for driving an image display section including a display area, the display area including a plurality of pixels arranged in a two-dimensional matrix, and
at a change of the input video signal from low-brightness display to high-brightness display for a portion of the display area including one or more of the pixels, during a period for the signal change, generating the output video signal for each of the one or more of the pixels in the portion of the display area to obtain an increased brightness for the portion of the display area,
calculating a sum value of the input video signal, via a video signal sum calculation section, the sum value being obtained by summing a sum step value in a time axis direction, the sum step value being provided corresponding to a value of the input video signal,
calculating a value of the output video signal, via a video signal level control section, by multiplying the sum value of the input video signal by a gain value, and during the period for the signal change, the gain value increases for multiplication of the value of the input video signal provided to each of the one or more of the pixels in the portion of the display area,
wherein the gain value for multiplication of the value of the input video signal varies based on the sum value.

10. An image display apparatus, comprising:
an image display section including a display area, the display area including a plurality of pixels arranged in a two-dimensional matrix; and
a signal generation section, wherein the signal generation section generates an output video signal based on an input video signal provided corresponding to an image to be displayed, the output video signal being a signal for driving the image display section, and in the signal generation section,
wherein
at a change of the input video signal from low-brightness display to high-brightness display for a portion of the display area including one or more of the pixels, during a period for the signal change, the signal generation section generates the output video signal for each of the one or more of the pixels in the

Assignees

• Joled Inc

Inventors

• Funatsu Yohei
• Araki Shoji

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2320/0653

  Controlling or limiting the speed of brightness adjustment of the illumination source · CPC title

• G09G3/3426

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

• G09G3/30 Primary

  using electroluminescent panels · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title