Method and apparatus for automatic viewing angle adjustment for liquid crystal display

• US 6,646,626 B1
• Filed: 11/01/1999
• Issued: 11/11/2003
• Est. Priority Date: 11/01/1999
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Ady, Roger W., Uskali, Robert G.
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Laneau, Ronald
• Application Number:
  US09/431,660
• Time in Patent Office: 1,471 Days
• Field of Search: 345/87, 345/88, 345/90, 345/95, 345/96, 345/97, 345/100, 345/649, 345/650, 345/656, 345/658, 345/659, 379/433.13, 379/433.04, 379/447, 455/90, 455/575
• US Class Current: 345/87
• CPC Class Codes: G09G 2320/0606 Manual adjustment
• CPC Class Codes: G09G 2320/068 for control of viewing angle adjustment
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

An apparatus (10) for automatically adjusting the viewing angle of a liquid crystal display (LCD) (12) is provided. The apparatus (10) includes a controller (26), an LCD driver (28), a memory (30), and a user interface (34). The apparatus (10) is software enabled to perform a screen flip function while concurrently adjusting the viewing angle to correspond to the new screen orientation. The viewing angle is automatically adjusted without user intervention. The apparatus (10) has particular value where the keypads (22) are located on only one side of its display (12). In this manner, the apparatus (10) can be conveniently used by both left-handed and right-handed users.

Claims

1. An apparatus comprising:

a display capable of being positioned in first and second orientations; and

a controller, operatively coupled to the display, configured to control a function that provides output to the display and to change contrast of the output of the function from a first contrast level to a second contrast level in response to the display changing position from the first orientation to the second orientation; and

a driver configured to provide to the display at least two contrast signals including a first contrast signal responsive to the display being positioned in the first orientation and a second contrast signal responsive to the display being positioned in the second orientation, the first contrast signal providing a contrast level on the display that is different from a contrast level provided on the display by the second contrast signal.

2. The apparatus of claim 1, further comprising a user interface for indicating an orientation of the display.

3. The apparatus of claim 1, wherein the controller determines each of the first and second contrast levels as a function of a user-selected contrast setting and an orientation of the display.

4. The apparatus of claim 3, wherein the controller is configured to receive the user-selected contrast setting for the first contrast level, and determine the user-selected contrast setting for the second contrast level based on the user-selected contrast setting for the first contrast level.

5. The apparatus of claim 1, wherein the first and second orientations differ by about 180 degrees.

6. The apparatus of claim 5, wherein the first orientation of the display permits one of either right-handed manipulation and left-handed manipulation of the output of the function whereas the second orientation of the display permits the other of either right-handed manipulation and left-handed manipulation of the output of the function.