Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2001-11-30
2004-01-20
Lao, Lun-Yi (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S100000, C345S092000, C345S208000
Reexamination Certificate
active
06680721
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a technical field pertaining to an active matrix drive type liquid crystal device driven by thin film transistors (hereinafter referred to as “TFT” as necessary) or the like, a driving circuit of an electro-optical apparatus based on electroluminescence or the like, an electro-optical apparatus equipped with the driving circuit, a driving method for an electro-optical apparatus, and an electronic apparatus employing the electro-optical apparatus and, more particularly, related to a technical field pertaining to peripheral circuits such as a scanning line driving circuit and a data line driving circuit of a liquid crystal device suitably used as a light valve or the like for a liquid crystal projector.
2. Description of Related Art
Hitherto, when a liquid crystal device is employed as the light valve for this type of liquid crystal projector, there are single-chip type in which only one liquid crystal device that is colored (i.e., a color filter is formed on an opposed substrate) is employed, and multi-chip type in which three colorless (i.e., no color filter is formed) liquid crystal devices for R, G, and B, respectively, are employed. The single-chip type has a simpler constitution, however, the multiple-chip type is more advantageous in that it provides a brighter display screen and higher image quality. According to the multi-chip type, the three color light rays which have been separately light-modulated by three liquid crystal devices are compounded into a single projection light ray through a prism or dichroic mirror, then projected on a screen.
Thus, when the light rays are merged through a prism or the like, as shown in
FIG. 16
, for example, while light R and light B are reflected by a prism
502
after the modulation through three RGB three light valves
500
R,
500
G, and
500
B, light G is not reflected by the prism
502
. This means that the number of light inversions of light G is smaller by one. This phenomenon naturally applies when the optical system is configured such that light R or light B in place of light G is not reflected by the prism
502
; this phenomenon also takes place when trichromatic light is compounded using a dichroic mirror or the like. Hence, in such a case, it is necessary to horizontally invert the display image related to light G in some form.
On the other hand, for a commercial strategic reason, there are cases where a single-chip or multi-chip type liquid crystal projector is preferably designed as a floor mounting type so that it can be installed on a floor as a typical installation and also as a banging type which is mounted on a ceiling upside down. In this case, even for the single-chip type, it is necessary to horizontally or vertically invert the display images supplied to a liquid crystal device according to how the projector is installed. There is another case as in the liquid crystal monitor, which is a single-chip liquid crystal device, of a portable video camera where the liquid crystal is required to be inverted about, for example, a flexible joint, according to the videotaping posture of a user thereof.
Conventionally, therefore, an image signal processing IC for supplying image signals in a predetermined format to a data line driving circuit of a liquid crystal device has been used to generate and supply, for each field, an image signal for handling images obtained by vertically or horizontally inverting original pictures, e.g., only for the image signal of G or of all image signals for all colors. This is convenient because it obviates the need for adding any change to the liquid crystal device or the peripheral circuits thereof.
Or, conventionally, in the case of the multi-chip type liquid crystal projector as described above, for example, in order to compound the light rays of the three colors, a liquid crystal device in which the scanning direction is horizontally inverted as compared to the liquid crystal devices for R and the liquid crystal device for B is employed as the liquid crystal device for G.
According to the conventional method wherein the image signal processing IC is employed to vertically or horizontally invert display images as described above, however, excessive load would be placed on the image signal processing IC to respond to the recent demand for higher image quality and would be impractical.
Furthermore, the method using the liquid crystal device in which the scanning direction is inverted vertically or horizontally poses the following problems. In general, a scanning line driving circuit or a data line driving circuit has a unidirectional shift register which has a fixed direction of transfer and it is constituted so that it supplies a scanning signal or an image signal in line sequence or dot sequence according to the transfer signals generated by the unidirectional shift register thereby to perform vertical or lateral scanning on a display screen. Hence, in the case of the multi-chip type liquid crystal projector, in order to use a liquid crystal device with inverted scanning direction, it is required to fabricate two types of liquid crystal devices, namely, an R-shift type liquid crystal device having its shift register designed such that the data line driving circuit scans from left to right in relation to a display image and an L-shift type liquid crystal device having its shift register designed such that the data line driving circuit scans from right to left in relation to the display image. It is obviously disadvantageous for a manufacturer to fabricate such two types of liquid crystal devices in, for example, the manufacturing process or the like of TFT by a semiconductor manufacturing equipment or the like. Also for the users, there would be a problem in that there is no compatibility between the similar liquid crystal devices and the individual devices can be used only as their types, posing a problem in practical use. Further, the liquid crystal devices with the fixed scanning directions cannot achieve the liquid crystal monitors for the liquid crystal projectors which can be used as the floor-mounting type or the ceiling hanging type as mentioned previously or for the portable video cameras with inverting screens.
In addition, when scanning signals or image signals are supplied to a data line or a group of data lines in accordance with the transfer signals from the shift registers, preceding image signal components are written due to the superimposition or the like of preceding or following image signals supplied to an adjacent data line or an adjacent group of data lines, causing ghosts or uneven images. This problem becomes conspicuous in a high-frequency drive environment.
SUMMARY OF THE INVENTION
The present invention has been made with a view toward solving the problems described above, and it is an object of the present invention to provide a driving circuit of an electro-optical apparatus for an liquid crystal device or the like which permits easy lateral or vertical inversion of the directions of horizontal scanning or vertical scanning by using a relative simple constitution, an electro-optical apparatus equipped with the driving circuit, and electronic apparatus equipped with the electro-optical apparatus.
To solve the aforesaid problems, a driving circuit for a liquid crystal device is made as a driving circuit for an electro-optical apparatus which has a plurality of data lines to which an image signal is supplied, a plurality of scanning lines to which a scanning signal is supplied, a switching means connected to the respective data lines and the respective scanning lines, and a pixel electrode connected to the switching means; and the driving circuit is comprised of a sampling circuit for sampling and supplying the image signal to the data lines and a first bidirectional shift register which has odd number of output stages for supplying a first transfer signal to the sampling circuit; wherein the respective output stages of the first bidirectional shift register are fixed in forward
Murade Masao
Shimotome Nobuyuki
Lao Lun-Yi
Oliff & Berridg,e PLC
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