Reverse images in a dot matrix LCD for an environmental control device

• US 7,050,026 B1
• Filed: 05/15/2003
• Issued: 05/23/2006
• Est. Priority Date: 05/15/2003
• Status: Active Grant

• Current Assignee: Rosen Technologies LLC (IPValuation Partners, LLC)
• Original Assignee: Howard Rosen
• Inventors: Rosen, Howard
• Primary Examiner(s): CHOW, DOON Y
• Application Number:
  US10/440,474
• Time in Patent Office: 1,104 Days
• Field of Search: 345/87, 345/94, 345/98, 345/99, 345/100, 345/101, 345/102, 345/211, 236/94
• US Class Current: 345/87
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value

Abstract

The present invention is a method for operating a backlighted dot matrix type LCD for displayed outputs from a programmable environmental control device, such as a programmable thermostat. The LCD is operated so that viewer elements of a displayed data item are non-opaque when a room where the LCD is located is darkened and the surrounding display elements are partially or completely opaque. Selected elements can also change from opaque to non-opaque to display an active condition.

Claims

1. A method for operating a dot matrix type liquid crystal digital display that is optionally backlighted by a backlight for viewing by a user in a room where the liquid crystal digital display is located, where display elements of the liquid crystal digital display are driven by inputs from a programmable environmental control device that comprises control means for environmental control equipment comprising:

(a) one or more data items capable of being displayed on the display, where each data item consists of one or more image sections and each image section is substantially surrounded by a surrounding section;

(b) each image section is determined by the control means to be a set of substantially continuously adjacent display elements required for viewing by the user;

(c) each surrounding section is determined by the control means to be a set of display elements required to substantially outline its image section;

(d) presetting requirements of a first condition in the control means and determination by the control means that the first condition has occurred;

(e) causing the image sections of a data item to be non-opaque and its surrounding sections to be partially or completely opaque;

(f) presetting requirements of a second condition in the control means and determination by the control means that the second condition has occurred;

(g) causing the image sections of a data item to be partially or completely opaque and its surrounding sections to be non-opaque; and

(h) the first condition is a first time of day and the second condition is a second time of day.

2. The method of claim 1 wherein the first condition is a first time of day near sunrise and the second condition is a second time of day near sunset, whereafter the backlight is powered to shine through non-opaque or partially opaque display elements.

3. The method of claim 1 wherein, for at least one data item, the second time of day of the second condition is a second time period since the occurrence of the first time of day of the first condition.

4. The method of claim 1 wherein the occurrence of a third condition changes the first and second times of day, respectively, of the first and second conditions.

5. A method for operating a dot matrix type liquid crystal digital display that is optionally backlighted by a backlight for viewing by a user in a room where the liquid crystal digital display is located, where display elements of the liquid crystal digital display are driven by inputs from a programmable environmental control device for controlling environmental control equipment comprising:

(a) one or more data items capable of being displayed on the display, where each data item consists of one or more image sections and each image section is substantially surrounded by a surrounding section;

(b) occurrence of a first condition;

(c) causing the image sections of one or more of the data items to be non-opaque and its surrounding sections to be partially or completely opaque;

(d) occurrence of a second condition; and

(e) causing the image sections of a data item to be partially or completely opaque and its surrounding sections to be non-opaque; and

(f) the first condition is a first time of day and the second condition is a second time of day.

6. The method of claim 5 wherein the first condition is a first time of day near sunrise and the second condition is a second time of day near sunset, whereafter the backlight is powered to shine through non-opaque or partially opaque display elements.

7. The method of claim 5 wherein, for at least one data item, the second time of day of the second condition is a second time period since the occurrence of the first time of day of the first condition.

8. A method for operating a liquid crystal digital display panel that is optionally backlighted by a backlight panel for viewing by a viewer in a room in which the liquid crystal digital display panel is located, where the liquid crystal digital display panel is driven by inputs from a programmable environmental control device that controls the operation of environmental control equipment comprising:

(a) the liquid crystal digital display panel displaying one or more data items, each display item comprising;

(i) an image section determined by the environmental control device to be display elements required for viewing by the viewer and driven to a first state;

(ii) a surrounding section determined by the environmental control device to be display elements surrounding the viewer elements and driven to a second state, where the second state is different from first state so that the viewer of the data item field can see a contrast between the viewer section and the surrounding section;

(b) determination by the programmable environmental control device of a first time of day or receipt of a signal generated by manual switching by a user using a user interface as a first condition; and

(c) after determination of the first condition, causing the display elements of the image section to be driven in the second state and the surrounding section to be driven in the first state, resulting in a visible image reversal to the viewer.