DISPLAY DRIVER AND METHOD FOR EVALUATING DISPLAY DEVICE

摘要

A display driver for driving a display panel includes a test control unit that generates n test data each designating a brightness gradation for each pixel of the panel, and controls a connected-state test for testing the display panel in a connected-state where the display panel and the display driver are electrically connected and a disconnected-state test for testing the display driver in a disconnected-state where the display panel and the display driver are electrically disconnected, a voltage converter that generates n pixel drive voltages from the n test data, an output unit that supplies each of the n pixel drive voltages to a corresponding data line in the connected-state, and a fault evaluator that outputs a test result signal including a fault or a no-fault in the connected-state and the disconnected-state by checking if each of the n pixel drive voltages is within an acceptable gradation voltage range.

主权项

1. A display driver for driving a display panel having a plurality of data lines in which a plurality of pixels are arranged, the display driver comprising:
n output lines each of which is connected to at least one of the plurality of data lines, n being an integer greater than 1; a test control unit configured to
generate n test data each of which designates a brightness gradation for each pixel formed on a corresponding one of the plurality of data lines, respectively, andcontrol a connected-state test for testing the display panel and a disconnected-state test for testing the display driver, the connected-state test being performed in a connected-state where the display panel and the display driver are electrically connected, the disconnected-state test being performed in a disconnected-state where the display panel and the display driver are electrically disconnected; a voltage converter configured to generate n pixel drive voltages for driving each pixel from the n test data; an output unit configured to supply each of the n pixel drive voltages to a corresponding one of the plurality of the data lines in the connected-state; and a fault evaluator configured to output a test result signal including a fault signal or a no-fault signal in the connected-state and the disconnected-state by checking a value of each of the n pixel drive voltages, the fault signal indicating at least one of the n pixel drive voltages is outside of the acceptable gradation voltage range, the no-fault signal indicating each of the n pixel drive voltages is within an acceptable gradation voltage range.