Testing device for liquid crystal display base plate

Claim 1

A device for testing defects in a liquid crystal display base plate comprising: a liquid crystal display base plate testing device placed facing the surface side of a liquid crystal display base plate; an electro-optical element which changes its optical characteristics when an electric field from said liquid crystal display base plate is applied across it; a power source to apply an electric voltage between said electro-optical element and each pixel element terminal of said liquid crystal display base plate; irradiating light from a light source against the back side of said electro-optical element; observing the reflected light received with a light detector; a mounting device for fixing said liquid crystal display base plate during testing; said mounting device having a flat surface and a base platform arranged so that the liquid crystal display base plate adheres to the surface of the mounting device; a groove formed on the surface of the base platform; and a device for vacuum attachment of the liquid crystal display base plate to the surface of the base platform by applying a vacuum to said groove.

Claim 2

A device for testing defects in a liquid crystal display base plate comprising: a liquid crystal display base plate testing device placed facing the surface side of a liquid crystal display base plate; an electro-optical element which changes its optical characteristics when an electric field from said liquid crystal display base plate is applied across it; a power source to apply an electric voltage between said electro-optical element and each pixel element terminal of said liquid crystal display base plate; irradiating light from a light source against the back side of said electro-optical element; observing the reflected light received with a light detector; a mounting device for fixing said liquid crystal display base plate during testing; said mounting device having a flat surface and a base platform arranged so that the liquid crystal display base plate adheres to the surface of the mounting device; a groove formed on the surface of the base platform; and a device for vacuum attachment of the liquid crystal display base plate to the surface of the base platform by applying a vacuum to said groove.

Claim 3

An apparatus for testing defects in liquid crystal display baseplates comprising: a liquid crystal display baseplate to be tested; an electro-optical element; a voltage source; a light source; a mounting device; and a light detector; said electro-optical element comprising a first and second side, said first side of said electro-optical element being coated with a transparent electrical conductor, said second side of said electro-optical element being coated with a non-conductive, optically reflective coating; said liquid crystal display baseplate having a circuit side, and a second side; said electro-optical element being placed adjacent to said liquid crystal display baseplate to be tested such that said second side of said electro-optical element is facing, and slightly spaced apart from said circuit side of said liquid crystal display baseplate; said light source illuminating said first side of said said electro-optical element; said voltage source electrically connected to said electrically conductive layer on said first side of said electro-optical element, and said circuitry on said liquid crystal display baseplate to be tested; said voltage source applying a voltage between said electro-optical element, and said liquid crystal display baseplate such that an electric field is generated across said electro-optical element; and said light detector oriented such that it detects light reflected from said second side of said electro-optical element, such that defective circuitry on said circuit side of said liquid crystal display baseplate being testing will cause a variation in the electric field generated, and thus a variation in the light reflected by the electro-optical element.

Claim 4

An apparatus for testing defects in liquid crystal display baseplates comprising: a liquid crystal display baseplate to be tested; an electro-optical element; a voltage source; a light source; a mounting device; and a light detector; said electro-optical element comprising a first and second side, said first side of said electro-optical element being coated with a transparent electrical conductor, said second side of said electro-optical element being coated with a non-conductive, optically reflective coating; said liquid crystal display baseplate having a circuit side, and a second side; said electro-optical element being placed adjacent to said liquid crystal display baseplate to be tested such that said second side of said electro-optical element is facing, and slightly spaced apart from said circuit side of said liquid crystal display baseplate; said light source illuminating said first side of said said electro-optical element; said voltage source electrically connected to said electrically conductive layer on said first side of said electro-optical element, and said circuitry on said liquid crystal display baseplate to be tested; said voltage source applying a voltage between said electro-optical element, and said liquid crystal display baseplate such that an electric field is generated across said electro-optical element; and said light detector oriented such that it detects light reflected from said second side of said electro-optical element, such that defective circuitry on said circuit side of said liquid crystal display baseplate being testing will cause a variation in the electric field generated, and thus a variation in the light reflected by the electro-optical element.