Image display device, image display system, and inspection method

Patent metadata

Field	Value
Publication number	US-11538390-B2
Application number	US-202117388698-A
Country	US
Kind code	B2
Filing date	Jul 29, 2021
Priority date	Jan 31, 2019
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

An image display device includes: an image signal reception unit configured to receive an image signal of a pattern image in which N partial images having a different gradation level value are regularly arranged; a conversion unit configured to convert a part of gradation level values included in the image signal in accordance with a predetermined conversion rule; and a display unit configured to display by using an image signal that undergoes conversion by the conversion unit. The conversion unit converts a gradation level value corresponding to a term of a predetermined arithmetic progression in accordance with the predetermined conversion rule.

First claim

What is claimed is:

1. An image display device comprising:
an image signal reception circuit configured to receive an image signal of a pattern image in which N partial images (where N is an integer of 2 or more) having a different gradation level value are regularly arranged;
a conversion unit configured to convert at least a part of gradation level values included in the image signal into a gradation level value in accordance with a predetermined conversion rule; and
a display unit configured to display by using an image signal that undergoes conversion by the conversion unit,
wherein a gradation level value of an n-th partial image (where n is an integer being not less than 1 and not more than N) among the N partial images is an n-th gradation level value of sequential N-stage gradation levels,
wherein the conversion unit is implemented by a table-type signal computer, a logic circuit, or a processor configured to execute instructions stored in a memory,
wherein the display unit is implemented by a display or a projector, and
wherein the predetermined conversion rule is:
(a) a rule in which even or odd gradation level values are replaced by a predetermined first gradation level value, the predetermined first gradation level value being one of the N-stage gradation levels;
(b) a rule for adding or subtracting N/2 to or from even or odd gradation level values, subtracting N from the added level value if the added level value is N or more, and adding N to the subtracted level value if the subtracted level value is less than 0;
(c-1) a rule for replacing even gradation level values being less than N/2 into N−1, and replacing even gradation level values being not less than N/2 into 0; or
(c-2) a rule for replacing odd gradation level values being less than N/2 into N−1, and replacing odd gradation level values being not less than N/2 into 0.

2. The image display device according to claim 1 , wherein the predetermined first gradation level value is a minimum value or a maximum value of the sequential N-stage gradation levels.

3. An inspection method comprising:
receiving an image signal of a pattern image in which N partial images (where N is an integer of 2 or more) having a different gradation level value are regularly arranged;
converting at least a part of gradation level values included in the image signal into a gradation level value in accordance with a predetermined conversion rule; and
displaying by using an image signal that undergoes the conversion,
wherein a gradation level value of an n-th partial image (where n is an integer being not less than 1 and not more than N) among the N partial images is an n-th gradation level value of sequential N-stage gradation levels, and
wherein the predetermined conversion rule is:
(a) a rule in which even or odd gradation level values are replaced by a predetermined first gradation level value, the predetermined first gradation level value being one of the N-stage gradation levels;
(b) a rule for adding or subtracting N/2 to or from even or odd gradation level values, subtracting N from the added level value if the added level value is N or more, and adding N to the subtracted level value if the subtracted level value is less than 0;
(c-1) a rule for replacing even gradation level values being less than N/2 into N−1, and replacing even gradation level values being not less than N/2 into 0; or
(c-2) a rule for replacing odd gradation level values being less than N/2 into N−1, and replacing odd gradation level values being not less than N/2 into 0.

Assignees

• Jvckenwood Corp

Inventors

• Higashikawa Shingo
• Takeshita Hiroshi

Classifications

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• H04N17/00

  Diagnosis, testing or measuring for television systems or their details · CPC title

• G09G2340/00

  Aspects of display data processing · CPC title

• G09G2320/0233

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