Detection-evaluation method and device for moiré pattern

Patent metadata

Field	Value
Publication number	US-9506875-B2
Application number	US-201414415953-A
Country	US
Kind code	B2
Filing date	Apr 30, 2014
Priority date	Dec 30, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

The present invention relates to the field of display technology and discloses a detection-evaluation method for moiré pattern, comprising steps of: S1, detecting luminances at a plurality of continuous positions in a predetermined region of a display panel which is displaying a full white picture, so as to obtain a luminance curve; and S2, judging whether a graphics including peaks and valleys exists in the luminance curve, if the graphics exists, determining that the moiré pattern exists. The present invention further discloses a detection-evaluation device for moiré pattern. The present invention realizes an effective and accurate detection for moiré pattern, and overcomes shortcomings in visual inspection.

First claim

The invention claimed is:

1. A detection-evaluation method for moiré pattern, comprising:
step S1, detecting luminances at a plurality of continuous positions in a predetermined region of a display panel which is displaying a full white picture, so as to obtain a luminance curve; and
step S2, judging whether a graphics including peaks and valleys exists in the luminance curve, and if the graphics exists, determining that there exists moiré pattern;
wherein after the step S2 the method further comprises:
calculating a luminance ratio between adjacent peak and valley to obtain several peak-to-valley ratios P i ;
calculating an average deviation degree S, with respect to 1, of the peak-to-valley ratios to evaluate the moiré pattern according to the following formula:

S
=

1

n
-
1

⁢

∑

i
=
1

n

⁢

⁢

(

P
i

-
1

)

2

where n is the number of the peak-valley ratios and P i is the i-th peak-to-valley ratio.

2. The detection-evaluation method for moiré pattern according to claim 1 , wherein the step S1 further comprises:
detecting the luminances at the plurality of continuous positions vertically in a rectilinear direction parallel to the display panel.

3. The detection-evaluation method for moiré pattern according to claim 1 , wherein the step S1 further comprises:
detecting luminances at a plurality of horizontal continuous positions at a reference point to obtain a horizontal luminance curve, and
detecting luminances at a plurality of vertical continuous positions at a reference point to obtain a vertical luminance curve.

4. The detection-evaluation method for moiré pattern according to claim 1 , wherein the detection in the step S1 is performed by using a luminance meter or a CCD.

5. A detection-evaluation method for moiré pattern, comprising:
step S1, detecting luminances at a plurality of continuous positions in a predetermined region of a display panel which is displaying a full white picture, so as to obtain a luminance curve; and
step S2, judging whether a graphics including peaks and valleys exists in the luminance curve, and if the graphics exists, determining that there exists moiré pattern, wherein after the step S2, the method further comprises:
calculating a luminance ratio between adjacent peak and valley to obtain several peak-to-valley ratios P i ;
calculating a deviation degree s i =P i −1, with respect to 1, of every peak-to-valley ratio, wherein P i is the i-th peak-to-valley ratio; and
generating a curve with using angles of detections as abscissa and using s i as ordinates so as to evaluate the moiré pattern.

6. A detection-evaluation device for moiré pattern, comprising:
a luminance detection unit which is used for detecting luminances at a plurality of continuous positions in a predetermined region of a display panel which is displaying a full white picture, so as to obtain a luminance curve; and
a curve judgment unit which is used for judging whether a graphics including peaks and valleys exists in the luminance curve, and if the graphics exists, the curve judgment unit determines that there exists moiré pattern,
wherein the detection-evaluation device further comprises:
a peak-to-valley ratio calculation unit which is used for calculating a luminance ratio between every adjacent peak and valley to obtain several peak-to-valley ratios P i ;
an average deviation degree calculation unit which is used for calculating an average deviation degree S, with respect to 1, of the peak-to-valley ratios to evaluate the moiré pattern according to the following formula:

S
=

1

n
-
1

⁢

∑

i
=
1

n

⁢

⁢

(

P
i

-
1

)

2

where n is the number of the peak-valley ratios and P i is the i-th peak-to-valley ratio.

7. The detection-evaluation device for moiré pattern according to claim 6 , further comprising a linear guide rail which is parallel to the display panel, and wherein the luminance detection units moves along the linear guide rail.

8. The detection-evaluation device for moiré pattern according to claim 7 , wherein the luminance detection unit vertically detects a luminance at each of the continuous positions to obtain a luminance curve.

9. The detection-evaluation device for moiré pattern according to claim 6 , further comprising a support for fixing the luminance detection unit and enabling the luminance detection unit to rotate around a fixed point, so that luminances at a plurality of horizontal continuous positions are detected by the luminance detection unit, so as to obtain a horizontal luminance curve, and luminances at a plurality of vertical continuous positions are detected by the luminance detection unit, so as to obtain a vertical luminance curve.

10. The detection-evaluation device for moiré pattern according to claim 6 , the luminance detection unit includes a luminance meter or a CCD.

11. The detection-evaluation device for moiré pattern according to claim 7 , further comprising:
a peak-to-valley ratio calculation unit which is used for calculating a luminance ratio between every adjacent peak and valley to obtain several peak-to-valley ratios P i ;
an average deviation degree calculation unit which is used for calculating an average deviation degree S, with respect to 1, of the peak-to-valley ratios to evaluate the moiré pattern according to the following formula:

S
=

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zhu Jinye
• Wei Wei
• Wu Naifu

Classifications

• G02F1/00

  Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics · CPC title

• G01N21/956 Primary

  Inspecting patterns on the surface of objects {(contactless testing of electronic circuits G01R31/308; testing currency G07D; manufacturing processes per se of semiconductor devices implementing a measuring step H10P74/20)} · CPC title