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US 6,188,453 B1Granted
Display apparatus having test elements under or bounded by the sealant
AssigneeSanyo Electric Co., Ltd.
InventorsHideki Matsuoka, Takao Suzuki, Norio Oku
Life of this patent
Estimating the term…
Abstract
In a LCD with a built-in driver, the quality of all elements is judged. A test TFT is formed immediately below a sealing material which bonds a TFT substrate and an opposite substrate, wherein test terminals are pulled out onto the eaves section of the TFT substrate protruding from the opposite substrate. The quality of TFTs are judged by considering changes of TFT characteristics under the conditions before and after the bonding process.
Claims15
A display apparatus comprising:
- a pair of substrates bonded with an adhesive applied circumferentially, so as to sandwich an optical material between said pair of substrates;
- a plurality of control elements disposed on one of said pair of substrates on a side facing the other substrate and controlled in response to a display signal for controlling said optical material to display each pixel independently;
- a plurality of signal input terminals formed on one of the substrates and connected to the control elements for applying the display signal;
- a testing element having a similar structure to said control elements and disposed in an area directly below said adhesive on one of said pair of substrates on a side facing the other substrate, the testing element being electrically isolated from the signal input terminals;
- and
- a test terminal connected to said testing element and adapted to receive a test signal to test characteristics of said testing element.
3 more elements
A display apparatus comprising:
- a pair of substrates bonded with an adhesive applied circumferentially, so as to sandwich an optical material between said pair of substrates;
- a plurality of control elements disposed on one of said pair of substrates on a side facing the other substrate and controlled in response to a display signal for controlling said optical material to display each pixel independently;
- a plurality of signal input terminals formed on one of the substrates and connected to the control elements for applying the display signal;
- a testing element having a similar structure to said control elements and disposed on one of said pair of substrates in an area surrounded by said adhesive on one of said pair of substrates on a side facing the other substrate, the testing element being electrically isolated from the signal input terminals;
- and
- a test terminal connected to said testing element and adapted to receive a test signal to test characteristics of said testing element.
3 more elements
A method for providing a display apparatus with a testing element comprising:
- bonding a pair of substrates with an adhesive applied circumferentially thereon so as to sandwich an optical material between the pair of substrates;
- forming a plurality of control elements on one of the substrates on a side facing the other substrate, the control elements being responsive to a display signal for controlling the optical material to display each pixel independently;
- providing a plurality of signal input terminals on one of the substrates, the signal input terminals being connected to the control elements for applying the display signal;
- providing a testing element having a similar structure to the control elements and disposed on one of the substrates on a side facing the other substrate either in an area directly below the adhesive or in an area surrounded by the adhesive, the testing element being electrically isolated from the signal input terminals;
- and
- providing a test terminal connected to the testing element and adapted to receive a test signal to test characteristics of said testing element.
3 more elements
Dependencies are inferred from the claim text.