System and method for controlling brightness in areas of a liquid crystal display

• US 9,378,688 B2
• Filed: 11/24/2014
• Issued: 06/28/2016
• Est. Priority Date: 11/24/2014
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Brush, Jeffrey Alan
• Primary Examiner(s): PARDO, THUY N
• Application Number:
  US14/551,787
• Publication Number:
  US 20160148580A1
• Time in Patent Office: 582 Days
• Field of Search: 345/690, 345/589, 345/8, 345/418, 345/619, 345/2.2, 348/222.1, 348/239, 382/130, 382/141
• US Class Current: 1/1
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A control system, and related method are disclosed for controlling brightness in areas of a LCD. The control system may comprise a LCD including a first display area and a second display area, and a controller in communication with the LCD. The controller may be configured to display an icon at an icon brightness level in the first display area, display a first image in the second display area, and display a mask image over the first image. The first image is visible through the mask image at a first composite brightness level. The first composite brightness level is less than the icon brightness level.

Claims

1. A control system comprising:

a LCD including a first display area and a second display area; and

a controller in communication with the LCD, the controller configured to;

display an icon at an icon brightness level in the first display area,

display a first image in the second display area,

display a mask image over the first image, wherein the first image is visible through the mask image at a first composite brightness level, the first composite brightness level being less than the icon brightness level,

display a plurality of additional overlapping mask images in the second display area, each of the mask images positioned to cover the first image and the first mask image, wherein the first image is visible through the plurality of mask images at a second composite brightness level, the second composite brightness level less than the first composite brightness level, and

receive a dimming input from a user interface, and determine the number of overlapping mask images to be applied to the first image based on the dimming input.

2. The control system of claim 1, in which the controller is further configured to remove the mask image from the first image, wherein the first image is visible at about the icon brightness level.

3. The control system of claim 1, wherein the controller is further configured to cause the LCD to display a second image in the second display area, wherein the mask image covers the second image and the second image is visible through the mask image at the first composite brightness level.

4. The control system of claim 1, wherein the first icon brightness level is twice a value of the second composite brightness level.

5. The control system of claim 1, wherein the icon is a system health indicator.

6. A method of controlling the localized brightness on a LCD that includes a first display area and a second display area, the method comprising:

displaying, by a controller, an icon in the first display area at an icon brightness level;

displaying, by the controller, a first image in the second display area; and

displaying, by the controller, a mask image in the second display area, the mask image positioned to cover the first image, wherein the first image is visible through the mask image at a composite brightness level, the composite brightness level being less than the icon brightness level, and wherein the mask image is comprised of a plurality of overlapping mask images, wherein the composite brightness level is diminishable with each successive mask image of the plurality of overlapping mask images;

receiving, by the controller, a dimming input; and

adjusting the number of masks applied over the first image based on the dimming input.

7. The method of claim 6, further comprising removing the mask image from the first image, wherein when the mask image is removed from the first image the first image is displayed at about the icon brightness level.

8. The method of claim 6, further including receiving a dimming input from a user interface.

9. The method of claim 6, further comprising:

removing the mask image from the first image; and

replacing the removed mask image with a different mask image that is less transparent than the removed mask image, wherein the first image is visible through the different mask image at a second composite brightness level, the second composite brightness level less than the prior composite brightness level.

10. The method of claim 6, further comprising displaying another icon in a third display area of the LCD, the third display area different than the first and second display areas, the other icon displayed at the icon brightness level.

11. A control system comprising:

a LCD disposed on a Machine, the LCD including a first display area and a second display area; and

a controller in communication with the LCD, the controller configured to;

display a system health or warning icon at an icon brightness level in the first display area,

display a plurality of images in the second display area, and

display a mask image over one or more of the images in response to a dimming input received by the controller, wherein each of the images over which the mask image is displayed are visible through the mask image at a composite brightness level, the composite brightness level less than the icon brightness level,

wherein the mask image comprises a plurality of overlapping mask images, wherein the composite brightness level is diminishable with each successive mask image in the plurality of overlapping mask images, wherein further each successive mask image may be selectively displayed in response to the dimming input or removed in response to the dimming input,

wherein the dimming input is provided by a light sensor.