Yokogawa Electric Corp. has developed a flat panel display (FPD) driver IC test system that supports high-speed interfaces. The ST6731, which will be available in March 2011, that supports interfaces having data rates 1 of 2 Gbps or faster.
The flat panel displays used in 3-D television sets and the like are steadily increasing in size and resolution, and the resolution of the displays used in portable communication devices such as smart phones (high-performance mobile phones) is also improving.
Given the increasing volume of data that must be processed per unit of time, there is a rising demand for ever more efficient test solutions that can process data at high rates of speed.
Driver IC test systems now need to support interfaces that have data rates of 2 Gbps or faster. The ST6731 meets this requirement, and it is also possible to upgrade the company's ST6730 so that it too can support these high-speed interfaces.
The ST6731 achieves a data rate of 2.52 Gbps and can test FPD driver ICs with 2 Gbps or faster interfaces such as those in 3-D television sets.
The ST6731 can measure output signals in two ways. In a gray-scale test that defines the display colors of an FPD, the test system sends input signals to the DUT and then measures its output signals. To evaluate the accuracy of a driver IC’s output signals, the ST6731 can also directly process images and other types of data that are stored on and output by the DUT, something that previously could not be done by test systems.
Gray-scale testing is a test mode to define the display colors of an FPD in which the settings of inputs to a driver IC are changed to vary the output voltage and all output signals are tested. A standard driver IC with 256 tones has about 1,000 output pins; the driver test system measures these and judges the accuracy of the output voltage.