System for correcting display device and method for correcting the same

Abstract

In a display device having a nonvolatile memory device, such as an active matrix type liquid crystal display device, display contents displayed on the display device are obtained by a camera device. The obtained information (corresponding to the display contents) is digital-converted and then processed to detect a defect and a nonuniformity on the display device, so that correction information is produced. The correction information is stored in the nonvolatile memory device of the display device. Display information to be displayed on the display device is processed using the stored correction information, so that display contents are corrected and a defect and a nonuniformity on the display contents are inconspicuous.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a display correction system for a display device, in particular, a display device having a nonvolatile memory device and a display device correction method. [0002] As a conventional display device, a cathode ray tube (CRT) device, a plasma display device, a liquid crystal display (LCD) device or the like is used. Recently, an LCD device, in particular, an active matrix type LCD device has been developed. [0003] Since a dielectric constant of a liquid crystal substance (molecule) in a parallel direction to a molecule axis is different from that in a vertical direction, an LCD device uses this characteristic and displays ON / OFF states, that is, light / dark states by adjusting a transmission quantity or a scattering quantity of a light. In general, a liquid crystal material includes, a twisted nematic (TN) liquid crystal, a super twisted nematic (STN) liquid crystal, a ferroelectric liquid crystal and the like. [0004] I...

AI Technical Summary

Benefits of technology

The present invention solves the problem of non-uniform display on a liquid crystal display (LCD) device by providing a correction system. The correction system includes a display device with a nonvolatile memory and a correction data producing device. The correction data producing device obtains the image signal displayed on the display device, converts it into digital data, and processes it to obtain correction data. The correction data is then written into the nonvolatile memory. The correction system can also include a method for operating the correction system and a display device comprising a display portion, driver, memory, and processor for adding the stored correction data to the image data to obtain corrected image data, which is then displayed on the display portion. The technical effect of the present invention is to ensure uniform display on LCD devices.

Problems solved by technology

If a TFT having a defect is in an open state or a short circuit state, a defect pixel has a desired voltage or a voltage on the defect pixel is unstable, so that the pixel produces as a point defect on a panel.

Though a defect of a pixel TFT can be corrected, a nonuniform display due to variation of a liquid crystal material and a band nonuniformity produced by rubbing cannot be corrected, so that an LCD device becomes a defective product in many cases.

In accordance with an increase of the size, it is difficult to maintain uniform display, so that a yield of an LCD device is deteriorated.

Also, in a personal computer and a work station, since an operator continues to watch a display portion at a near position for a long period of time, nonuniform display is disagreeable for an operator and efficiency of the operator decreases, so that it is a claim subject from a user.

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