Browse Prior Art Database

Thin Film Transistor Liquid Crystal Display Array Twin Head Contact Method

IP.com Disclosure Number: IPCOM000116273D
Original Publication Date: 1995-Aug-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 68K

Publishing Venue

IBM

Related People

Hashimoto, H: AUTHOR [+2]

Abstract

Disclosed is a test method for Thin Film Transistor (TFT) Liquid Crystal Display (LCD) ARRAY circuit with the ARRAY TESTER. The chip printed on TFT array panel used to be tested one at a time per chip. The new method enables it to be done with two chips simultaneously.

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This is the abbreviated version, containing approximately 70% of the total text.

Thin Film Transistor Liquid Crystal Display Array Twin Head Contact
Method

      Disclosed is a test method for Thin Film Transistor (TFT)
Liquid Crystal Display (LCD) ARRAY circuit with the ARRAY TESTER.
The chip printed on TFT array panel used to be tested one at a time
per chip.  The new method enables it to be done with two chips
simultaneously.

      This improvement results in approximately 60% reduction of the
test lead time compared with the traditional test method.  In
addition, it makes the defect isolation easier than the old way
because of the dual head exchangeability.

      Fig. 1 shows the current test method, and Fig. 2 shows the new
test method which is described with this article.  The current method
(Fig. 1) has one contact head with one test system.  The new method
(Fig. 2) has two heads with two systems in one prober and tests two
chips in array panel together.

      The following is the effects of this new test method:
  1.  The new test sequence cuts 60% of the test time used to spend.
        Example: VGA(640x480x3 pixels), 4 TFT LCD chips/panel
          BEFORE: A -> B -> C -> D    200 sec/panel
          NEW   : A and B -> C and D  120 sec/panel
  2.  The dynamic test system makes the test verification
exchangeable.
      o  If there were any problems in the test results, the re-test
          can be easily done to isolate it could be due to the real
          product...