This application does not claim priority to any pending applications.
Embodiments generally relate to electronic displays used for advertising, informational, and point of sale applications.
Electronic displays are now used in a variety of applications where the displays remain on for extended periods of time. In some applications, the displays may show a single static image for hours at a time. In other applications, portions of the display might be showing dynamic video while other portions show a static image. In other applications, a display might malfunction and ‘freeze’ and show a single image until the malfunction has been corrected. It has been found that leaving a static image on an electronic display for a long period of time can cause burn-in or image retention, where distinct marks or patterns can be seen on the display at all times, due to previous long-held static image signals.
Exemplary embodiments provide a system and method for determining when image retention could be a concern for an electronic display. The exemplary systems and methods can determine when portions of the display might be at risk, even while others are clearly not. An Image Retention Prevention Method is preferably ran when portions of a display (or the entire display) have been determined to have image retention concerns. The overall appearance of the display should not be affected when the Image Retention Prevention Method is performed. In other words, to a viewer, there should be no discernable difference in the viewed image whether the Image Retention Prevention Method is being ran or not.
The foregoing and other features and advantages of the present invention will be apparent from the following more detailed description of the particular embodiments, as illustrated in the accompanying drawings.
A better understanding of an exemplary embodiment will be obtained from a reading of the following detailed description and the accompanying drawings wherein identical reference characters refer to identical parts and in which:
The invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Embodiments of the invention are described herein with reference to illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in this figure, the display controller 50 is currently sending pixel data for a dynamic video on a first portion 125 of the electronic display's active image area while simultaneously sending pixel data for a static image on a second portion 150 of the electronic display's active image area. It should be immediately noted, that although a portrait display is shown here, this is not required as any orientation will work with the disclosed embodiments. Further, embodiments are not limited to only two areas (i.e. one dynamic video and one static image) as any number of areas could be combined and there could be multiple static image areas as well as multiple dynamic video areas.
As will be described further below, the exemplary method analyzes the data for pixels of the electronic display, and these pixels can be sub-pixels (a single color) or the combined color pixel (multiple sub-pixels combined to produce a color). There is no requirement for any embodiments that a specific type of pixel is used for the analysis. Further, there is no requirement that a specific type of electronic display is used either, as any display which produces an image based on a combination of pixels will suffice. Thus, the electronic display 100 could be any one of the following: LCD, LED, plasma, OLED, and any form of electroluminescent polymer.
Generally speaking, when presented with the situation shown in
Generally speaking, the Analysis Area 200 begins at Location 1, performs a check sum calculation of the pixel data for each pixel within the Analysis Area 200 when located at Location 1, and then moves on to Location 2, and so on until the Total Number of Locations (N) has been calculated. While shown in
The Time Threshold (TT) may be referred to as the total amount of time that the checksum data is calculated, before the system begins to analyze said checksum data. This value can be selected based on a number of seconds, minutes, frames of video, or a cycle time based on how long it takes a processor to calculated each Location(L) across the entire display one time (i.e. TT=60 cycles, where the system calculates the check sum data for each location 60 times before analyzing the data). Referring again to an embodiment on a 3840×2160 UHD display, it has been found that the checksum data can be calculated for each Location(L) every 69 seconds (at a 30 Hz refresh rate). Here, the TT may be selected as X cycles, which could also be referred to as (X*69) seconds, i.e. 10 cycles could also be referred to as 690 seconds.
The resulting check sum data shown in
The Pixel Delta (PΔ) can be measured as the amount of variance across the check sum data. In some embodiments, this is calculated as the standard deviation of the check sum data. With this type of embodiment, the Pixel Threshold (PT) can be selected as the minimum level of standard deviation that is acceptable before image retention becomes a concern. This can vary widely depending on the system being used. For example, some systems may be so accurate that PT can be extremely small, or even near zero, so that image retention is not a concern unless the pixel data remains almost constant throughout the entire TT. In other systems, there may be noise in the system that would necessitate placing the PT at a higher level, such that pixel data would not have to be constant to trigger the concern over image retention, only that the amount of change was lower than a pre-selected amount (which can be well above zero).
For example, assume that PΔ is calculated as the standard deviation and PT is very low, for this example PT=0. When analyzing the data from
Once Time Interval(t) reaches TT, the Pixel Delta (PΔ) for the first Location(L=1) is calculated and compared to the PT. If PΔ is not less than or equal to PT, the system moves on to calculate PΔ for the next Location(L=2) and again compares PΔ to PT. When any PΔ is less than or equal to PT, an Image Retention Prevention Method is performed. Once each Position(P) has been analyzed, the system preferably returns to re-set the Time Interval(t) equal to 1 (or zero) and resumes calculating checksum data for each Location(L).
An exemplary embodiment of the Image Retention Prevention Method would essentially transmit alternate pixel data (i.e. not the data which is necessary to create the image/video) to the modified pixels 325. While the modified pixels 325 are shown in
As noted above, in the exemplary embodiments the overall appearance of the display should not be affected when the Image Retention Prevention Method is performed. In other words, to a viewer, there should be no discernable difference in the viewed image whether the Image Retention Prevention Method is being ran or not.
Having shown and described a preferred embodiment of the invention, those skilled in the art will realize that many variations and modifications may be made to affect the described invention and still be within the scope of the claimed invention. Additionally, many of the elements indicated above may be altered or replaced by different elements which will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.
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