Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-06-26
2003-04-15
Kostak, Victor R. (Department: 2011)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S010000, C348S189000
Reexamination Certificate
active
06549183
ABSTRACT:
BACKGROUND OF THE INVENTION
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.
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.
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.
It is said that among display devices using a liquid crystal, an active matrix type LCD device has a superior display characteristic. As shown in
FIG. 2
, in a conventional active matrix type LCD device, source lines
203
to
205
connected to a source driver
201
are combined with gate lines
206
to
208
connected to a gate driver
202
in a matrix form, and thin film transistors (TFTs)
209
to
212
are arranged in these intersection portions. Gate electrodes in TFTs are connected to the gate lines
206
to
208
, source electrodes in the TFTs are connected to the source lines
203
to
205
, and drain electrodes in the TFTs are connected to pixel electrodes and retaining capacitors
213
to
216
. Liquid crystal
217
to
220
are arranged between the pixel electrodes.
FIGS. 3A
to
3
C show operation waveforms of the TFT. When signal voltages are applied to the gate electrode and the source electrode of the TFT, the TFT is turned on, so that a voltage on the pixel electrode almost coincides with a source voltage. When the signal voltage is not applied to the gate electrode of the TFT, the TFT is turned off, so that a voltage on the pixel electrode is maintained until the TFT is turned on next.
Since a voltage is applied from the pixel electrode to the liquid crystal by the above manner, an LCD device having less crosstalk and a large contrast with respect to adjacent pixels can be produced.
In an active matrix type LCD device described above, since the necessary number of TFTs corresponds to the number of pixels, a defect produces in a TFT element formed in a substrate. 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. Also, by variations of a threshold value and a mobility in a TFT, a voltage applied to a pixel electrode is varied, so that variations in brightness (gradation) of pixels produce.
To solve the above problem, as shown in
FIG. 4
, in a pixel portion having gate lines
401
and
402
and source lines
403
and
404
, a plurality of TFTs
405
and
406
are arranged for one pixel electrode
407
to obtain redundancy. That is, if the TFT
406
is a defective element, a drain terminal is scribed (cut) in a laser scribing portion
408
using a laser or the like to remove a defective element.
A defective element is detected by using a structure as shown in FIG.
5
. In
FIG. 5
, the structure includes gate lines
501
and
502
, source lines
503
and
504
, common electrode line
505
, TFTs
506
to
509
, retaining capacitors
510
and
511
, switches
512
to
515
, amplifiers
516
and
517
, measurement terminals
518
and
519
and power sources
520
and
521
. A voltage by which a TFT is turned on sufficiently is applied to the gate lines
501
and
502
connected to elements to be examined through the switches
512
and
513
and simultaneously a desired voltage is applied to the source lines
503
and
504
connected to the elements through the switches
514
and
515
. Next, a voltage on the gate lines is set to a ground level, to turn off the TFTs.
Application of the voltage to the source lines is stopped and then the TFTs are leaved for a desired period of time. After that, a voltage is applied to the gate lines again and then a voltage on the source lines is measured. When the TFTs are in a normal state, since a first source voltage is maintained by the retaining capacitors, it is measured. Also, When a drain and a source in each TFT are in a short circuit state, since discharge produces in each TFT through resistors connected to the source lines while leaving the TFTs, a voltage is varied in measurement. Further, when the TFTs are in an open state, even though a voltage is applied to the gate lines, the voltage is not applied to the retaining capacitors. Furthermore, even through the retaining capacitors are charged insufficiently by variations of mobility and threshold of the TFT, a defect element can be distinguished by voltage measurement with high accuracy.
In a conventional LCD device and a correction method for the device, as described above, the following problems produce. 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 general, when an operator watches a display device, two pixels which are sufficiently apart from each other cannot be distinguished even though a brightness (gradation) difference between one pixel and the other pixel is 10% or more. However, adjacent pixels are distinguished each other even though the brightness difference is about 2%. Therefore, it is important to suppress variations of brightness between adjacent pixels.
An LCD device has a tendency to extend a size of a display portion (screen portion). 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.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the above problem. In the present invention, a liquid crystal display (LCD) device includes a memory device for storing correction contents of pixel, and correction is performed by storing into the memory device the correction contents obtained by an external camera device, so that uniform display can be performed.
According to the present invention, there is provided a correction system comprising: a display device having a nonvolatile memory; and a correction data producing device, wherein the correction data producing device includes, an obtaining circuit for obtaining an image signal displayed on the display device, a converter for converting the image signal into digital data, a signal processor for processing the digital data to obtain correction data, and a writing circuit for writing the correction data into the nonvolatile memory.
According to the present invention, there is provided a method for operating a correction system including a display device and a correction data producing device, wherein the display device has a nonvolatile memory, and the correction data producing device includes an obtaining circuit for obtaining an image signal displayed on the display device, a converter for converting the image signal into digital data, a signal processor for processing the digital data to obtain correction data, and a writing circuit for writing the correction data into the nonvolatile memory, the method comprising the step of processing the correction data stored in the nonvolatile memory and the image signal to be displayed on the display device, to correct the image signal.
According to the present invention, th
Kostak Victor R.
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
Semiconductor Energy Laboratory Co,. Ltd.
LandOfFree
System for correcting display device method for correcting... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for correcting display device method for correcting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for correcting display device method for correcting... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3095502