Device for inspecting mask plate, method for inspecting mask plate, and corresponding method for controlling light sources

Patent metadata

Field	Value
Publication number	US-10986283-B2
Application number	US-201816338350-A
Country	US
Kind code	B2
Filing date	Aug 13, 2018
Priority date	Sep 30, 2017
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

The embodiments of the present disclosure propose a device for inspecting a mask plate, a method for inspecting a mask plate, and a corresponding method for controlling light sources. The device includes: an image sensor configured to capture an image of the mask plate; and a plurality of light sources disposed on one side of the mask plate opposite to the image sensor, wherein at least one of the plurality of light sources is configure to emit light when the image sensor is capturing an image of a first region of the mask plate, and the at least one light source comprises light sources within a first range, wherein the first range corresponds to the first region and an orthographic projection of the image sensor on a light source plane falls within the first range. The method for controlling light sources includes: turning on at least one of a plurality of light sources disposed on one side of the mask plate opposite to an image sensor, which corresponds to a first region of the mask plate to be inspected, when the image sensor is moved to a position corresponding to the first region.

First claim

We claim:

1. A device for inspecting a mask plate, the mask plate being divided into a plurality of regions, the device comprising:
an image sensor configured to move in a path to capture an image of different regions of the mask plate; and
a plurality of light sources on a light source plane disposed on one side of the mask plate opposite to the image sensor, the plurality of light sources being arranged in an array and divided into the plurality of ranges,
wherein at least one light source of the plurality of light sources is configured to emit light when the image sensor is capturing an image of a first region of the plurality of regions of the mask plate, and
wherein the at least one light source comprises light sources within a first range of the plurality of ranges, wherein the first range corresponds to the first region and an orthographic projection of the image sensor on the light source plane falls within the first range,
wherein remaining ones of the plurality of light sources other than the at least one light source are configured not to emit light when the image sensor is capturing the image of the first region of the mask plate, and
wherein the plurality of light sources are disposed on a light source supporting structure, wherein the light source supporting structure enables the plurality of light sources to move with respect to the mask plate in a light-exiting direction, so as to adjust spacing between the light sources and the mask plate, respectively.

2. The device according to claim 1 , wherein the at least one light source further comprises light sources within a second range, wherein the second range is a predetermined range which comprises the first range and extends in an expected movement direction of the image sensor.

3. A method for inspecting a mask plate, the mask plate being divided into a plurality of regions, the method comprising:
moving an image sensor to a position corresponding to a first region of the plurality of regions of the mask plate to be inspected;
controlling at least one light source of a plurality of light sources on a light source plane, which is disposed on one side of the mask plate opposite to the image sensor, to emit light, and controlling remaining ones of the plurality of light sources other than the at least one light source not to emit light, the plurality of light sources being arranged in an array and divided into a plurality of ranges; and
capturing an image of the first region by the image sensor,
wherein the at least one light source comprises light sources within a first range of the plurality of ranges, wherein the first range corresponds to the first region and an orthographic projection of the image sensor on the light source plane falls within the first range,
wherein the plurality of light sources are disposed on a light source supporting structure, wherein the light source supporting structure enables the plurality of light sources to move with respect to the mask plate in a light-exiting direction, so as to adjust spacing between the light sources and the mask plate, respectively.

4. The method according to claim 3 , wherein the at least one light source further comprises light sources within a second range, wherein the second range is a predetermined range which comprises the first range and extends in an expected movement direction of the image sensor.

5. A method for controlling light sources when a mask plate is inspected, the mask plate being divided into a plurality of regions, the method comprising:
controlling at least one light source of a plurality of light sources on a light source plane, which is disposed on one side of the mask plate opposite to an image sensor, to emit light, when the image sensor is moved to a position corresponding to a first region of the plurality of regions of the mask plate to be inspected, the plurality of light sources being arranged in an array and divided into a plurality of ranges and
controlling remaining ones of the plurality of light sources other than the at least one light source not to emit light when the image sensor is capturing an image of the first region of the mask plate,
wherein the at least one light source comprises light sources within a first range of the plurality of ranges, wherein the first range corresponds to the first region and an orthographic projection of the image sensor on the light source plane falls within the first range
wherein the plurality of light sources are disposed on a light source supporting structure, wherein the light source supporting structure enables the plurality of light sources to move with respect to the mask plate in a light-exiting direction, so as to adjust spacing between the light sources and the mask plate, respectively.

6. The method according to claim 5 , wherein the at least one light source further comprises light sources within a second range, wherein the second range is a predetermined range which comprises the first range and extends in an expected movement direction of the image sensor.

Assignees

• Ordos Yuansheng Optoelectronics Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Lin Zhiming
• Huang Chunchieh
• Baiyin Bili
• Hao Zhiyuan
• Zhang De
• Xin Xiaolin
• Liu Xu
• Li Dongwei

Classifications

• H04N25/71

  Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors · CPC title

• H04N23/74 Primary

  by influencing the scene brightness using illuminating means · CPC title

• H04N23/60

  Control of cameras or camera modules · CPC title

• G06T7/0004 Primary

  Industrial image inspection · CPC title

• G06T2207/30121

  CRT, LCD or plasma display · CPC title