Computer graphics processing and selective visual display system – Display driving control circuitry – Intensity or color driving control
Reexamination Certificate
2000-05-15
2003-03-18
Nguyen, Chanh (Department: 2675)
Computer graphics processing and selective visual display system
Display driving control circuitry
Intensity or color driving control
C345S089000
Reexamination Certificate
active
06535225
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device having a section for automatically setting the angle of visibility or contrast of a display screen in correspondence with the angle of the display screen for a user or the like.
2. Description of the Related Art
As is well known, an angle of visibility is present in a display device in the light of its nature. Further, it is experientially known that the visibility of the display screen changes even within the range of the angle of visibility depending on the angle formed by the user's eye line and the display screen.
For example, it is experientially known that, in liquid crystal displays which are used for various electronic appliances as lightweight and thin display devices, a clearest view can be obtained when the angle formed by the user's eye line and the display screen of the liquid crystal display is orthogonal, and that the visibility gradually declines as the display screen is tilted with respect to the user's eye line.
A display device disclosed in JP-A-6-38136 is known as a display device for ameliorating such a change in the visibility corresponding to the angle formed by the user's eye line and the display screen.
This display device is supported by an angle adjusting mechanism, and is provided with an angle detecting section for detecting a tilt angle of the display device with respect to the angle adjusting mechanism as well as a storage section for storing individual contrast data in correspondence with respective tilt angles. If the user tilts the display device, specific contrast data is read out from the storage section in correspondence with the tilt angle detected by the angle detecting section, and the contrast of the display screen is set on the basis of the contrast data.
Further, it is possible to change (adjust) the contrast data in the storage section for each tilt angle. If the user tilts the display device at a desired angle and effects an adjustment operation of the contrast at that tilt angle, the angle detecting section detects the tilt angle, and the storage section replaces the old contrast data corresponding to that tilt angle with newly adjusted contrast data, and stores the same. Accordingly, if the user tilts the display device at the desired angle after adjustment, the display is given with automatically adjusted contrast.
However, with the above-described conventional display device, if the user attempts to adjust the contrast appropriately with respect to a plurality of or all the tiltable angles, it has been necessary to consecutively tilt the display device and repeat the operation of contrast adjustment for the respective tilt angles. For this reason, a complicated operation is required for the user, and it cannot be said that the operational efficiency has been satisfactory.
Namely, the aforementioned contrast adjustment is effected in the procedure shown in the flowchart in FIG.
8
. First, when the user tilts the display device at a desired angle (Step S
200
), this tilt angle &thgr; is detected by the angle detecting section (Step S
202
). Next, when the user effects an operation for adjusting the contrast to one corresponding to the tilt angle &thgr; (Step S
204
), the storage section stores the adjusted contrast data in correspondence with the angle &thgr; (Step S
206
). Then, a determination is made as to whether or not an instruction for termination of the adjustment has been given by the user (Step S
208
), and if the instruction for termination has not been given, contrast adjustment processing is repeated with respect to another tilt angle &thgr; starting with Step S
200
. Accordingly, if the user attempts to adjust the contrast with respect to a plurality of tilt angles &thgr;, it has been necessary to change the contrast data one by one by repeating the operation in Steps S
200
and S
204
a plurality of times.
In other words, contrast adjustment is made as the user updates (rewrites) the contrast data stored in the storage section through a step-by-step operation. For this reason, as shown in
FIG. 9
, in order to adjust the contrast data (contrast values) M
0
, M
1
, M
2
, . . . , which have already been stored in the storage section in correspondence with the respective tilt angles &thgr;
0
,&thgr;
1
, &thgr;
2
, . . . , to appropriate contrast values CM
0
, CM
1
, CM
2
, . . . , the user must individually perform operations one by one in which the contrast value M
0
corresponding to the tilt angle &thgr;
0
is changed to CM
0
in a first adjustment operation, the contrast value M
1
corresponding to the tilt angle &thgr;
1
is changed to CM
1
in a second operation, the contrast value M
2
corresponding to a next tilt angle &thgr;
2
is changed to CM
2
in a third operation, and so forth. Thus, there has been a problem in that a complicated operation is imposed on the user.
In addition, while the user is performing such a repeated operation, the user's viewing position may become offset. Therefore, there can be cases where, even if the user thinks that he or she is performing the adjustment operation appropriately, the adjustment cannot be done appropriately as a result. Since readjustment is required in such a case as well, there has been a problem in the operational efficiency. Accordingly, because the viewing position is liable to become offset, not only is the operation troublesome, but there has been the problem that appropriate contrast adjustment cannot be effected easily.
SUMMARY OF THE INVENTION
The invention has been devised to overcome the above-described problems of the conventional art, and it is an object of the invention to provide a display device capable of setting an appropriate angle of visibility or contrast in correspondence with the angle of the display screen with respect to the user or the like, and of improving the operational efficiency of angle-of-visibility or contrast adjustment.
To attain the above object, in accordance with a first aspect of the invention, there is provided a display device which has a display screen and is supported by an angle adjusting mechanism, comprising: detecting section for detecting an angle formed by the display screen and the angle adjusting mechanism; and setting section for setting an angle of visibility of the display screen on the basis of information on an angle of visibility corresponding to the angle detected by the detecting section, wherein, in a state in which the display screen is set to one angle with respect to the angle adjusting mechanism, the setting section adjusts the angle of visibility at the one angle by adjusting the information on an angle of visibility corresponding to the one angle, and subsequently adjusts the information on an angle of visibility corresponding to remaining angles, to thereby automatically adjust the angles of visibility corresponding to the remaining angles.
In accordance with the above-described first aspect of the invention, when the user or the like tilts the display screen at one desired angle and gives an instruction for adjusting the angle of visibility to the setting section, the setting section adjusts the angle of visibility of the display screen on the basis of information on an angle of visibility corresponding to the one angle. Further, the setting section automatically effects the adjustment of the angles of visibility corresponding to the remaining angles on the basis of the adjustment value used at the time of the angle-of-visibility adjustment at the one angle. Consequently, as the user or the like merely gives an instruction for the angle-of-visibility adjustment for the one angle, the angle-of-visibility adjustment for the other (remaining) angles is automatically made. Hence, the angle-of-visibility adjustment can be made for all the directions by a simple operation. After the angle-of-visibility adjustment, as the user only tilts the display screen at a desired angle, the display at an appropriate angle of visibility is effected automatically.
In accordance with a s
Horie Shuichi
Kurihara Keiichi
Munetomo Shigeru
Narushima Hiroki
Sasaki Takahiro
Nguyen Chanh
Pioneer Corporation
Sughrue & Mion, PLLC
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