Patent Publication Number: US-9837008-B2

Title: Information handling system with a double blue-blue pixel structure arrangement

Description:
FIELD OF THE DISCLOSURE 
     The present disclosure generally relates to information handling systems, and more particularly relates to an information handling system with a double blue-blue pixel structure arrangement. 
     BACKGROUND 
     As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option is an information handling system. An information handling system generally processes, compiles, stores, or communicates information or data for business, personal, or other purposes. Technology and information handling needs and requirements can vary between different applications. Thus information handling systems can also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information can be processed, stored, or communicated. The variations in information handling systems allow information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems can include a variety of hardware and software resources that can be configured to process, store, and communicate information and can include one or more computer systems, graphics interface systems, data storage systems, networking systems, and mobile communication systems. Information handling systems can also implement various virtualized architectures. Data and voice communications among information handling systems may be via networks that are wired, wireless, or some combination. 
     An information handling system can include an organic light-emitting diode (OLED) display. The OLED display can include different color sub-pixels, such as red, green, and blue, and these color sub-pixels can be turned on at different levels and blended together to render the colors displayed on the OLED display. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the Figures are not necessarily drawn to scale. For example, the dimensions of some elements may be exaggerated relative to other elements. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the drawings herein, in which: 
         FIG. 1  is a diagram of an embodiment of color pixels on a display of an information handling system in accordance with at least one embodiment of the present disclosure; 
         FIG. 2  is a diagram illustrating a first manufacturing mask on a substrate of the display in accordance with at least one embodiment of the present disclosure; 
         FIG. 3  is a diagram illustrating a cross section of the first manufacturing mask and the substrate in accordance with at least one embodiment of the present disclosure; 
         FIG. 4  is a diagram illustrating a second manufacturing mask on a substrate of the display in accordance with at least one embodiment of the present disclosure; 
         FIG. 5  is a diagram illustrating a cross section of the second manufacturing mask and the substrate in accordance with at least one embodiment of the present disclosure; 
         FIG. 6  is a diagram illustrating a third manufacturing mask on a substrate of the display in accordance with at least one embodiment of the present disclosure; 
         FIG. 7  is a diagram illustrating a cross section of the third manufacturing mask and the substrate in accordance with at least one embodiment of the present disclosure; 
         FIG. 8  is a diagram of another embodiment of color pixels on a display of an information handling system in accordance with at least one embodiment of the present disclosure; and 
         FIG. 9  is a flow diagram of a method for pixel shifting an image on the display of the information handling system. 
     
    
    
     The use of the same reference symbols in different drawings indicates similar or identical items. 
     DETAILED DESCRIPTION OF THE DRAWINGS 
     The following description in combination with the Figures is provided to assist in understanding the teachings disclosed herein. The description is focused on specific implementations and embodiments of the teachings, and is provided to assist in describing the teachings. This focus should not be interpreted as a limitation on the scope or applicability of the teachings. 
       FIG. 1  shows a display  100  for an information handling system. In the embodiments described herein, an information handling system includes any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or use any form of information, intelligence, or data for business, scientific, control, entertainment, or other purposes. For example, an information handling system can be a personal computer, a consumer electronic device, a network server or storage device, a switch router, wireless router, or other network communication device, a network connected device (cellular telephone, tablet device, etc.), or any other suitable device, and can vary in size, shape, performance, price, and functionality. 
     The information handling system can include memory (volatile (such as random-access memory, etc.), nonvolatile (read-only memory, flash memory etc.) or any combination thereof), one or more processing resources, such as a central processing unit (CPU), a graphics processing unit (GPU), hardware or software control logic, or any combination thereof. Additional components of the information handling system can include one or more storage devices, one or more communications ports for communicating with external devices, as well as, various input and output (I/O) devices, such as a keyboard, a mouse, a video/graphic display, or any combination thereof. The information handling system can also include one or more buses operable to transmit communications between the various hardware components. Portions of an information handling system may themselves be considered information handling systems. 
     The display  100  can be any type of display, such as a light-emitting diode (LED) display, an organic LED (OLED) display, or the like. The display  100  includes multiple red sub-pixels  102 , multiple blue sub-pixels  104 , and multiple green sub-pixels  106 . A first pixel  108  of the display  100  is created in response to one red sub-pixel  102 , one blue sub-pixel  104 , and one green sub-pixel  106  being provided with a current to place these sub-pixels in an on state. A second pixel  110  is created in response to another red sub-pixel  102 , another blue sub-pixel  104 , and another green sub-pixel  106  being provided with a current to place the sub-pixels in an on state. 
     The sub-pixels  102 ,  104 , and  106  are arranged in rows and column on the display  100 , such that the sub-pixels are placed horizontally adjacent to a color sub-pixel of another type in a row of the display. For example, the locations of the sub-pixels in each row are as follows: red sub-pixel  102  in a first position; blue sub-pixel  104  in a second position; green sub-pixel  106  in a third position; blue sub-pixel  104  in a fourth position; red sub-pixel  102  in a fifth position; blue sub-pixel  104  in a sixth position; green sub-pixel  106  in a seventh position; blue sub-pixel  104  in an eighth position; red sub-pixel  102  in a ninth position; blue sub-pixel  104  in a tenth position; and a green sub-pixel  106  in a eleventh position. In an embodiment, the positions of the sub-pixels are based on a distance from an edge of the display  100 . For example, blue sub-pixel  104  in the second position is further from the edge of the display  100  than the red sub-pixel  102  in the first position. For clarity and brevity, only a portion of the sub-pixels on the display have been shown in  FIG. 1 . However, one of ordinary skill in the art would recognize that the order of the sub-pixels stated above can continue across the display until a sufficient number of sub-pixels are used to provide a desired resolution of the display  100 . 
     In a typical display, the sub-pixels rotate between the sub-pixel colors to create a pixels. For example, the sub-pixels can rotate across a row of a display in the following order: red, green, blue, red, green, blue, and the like. In this example, each group of one red, one green, and one blue sub-pixel can be a single pixel. Some displays perform pixel shifting, which periodically moves an entire video or image frame vertically and/or horizontally so that the display does not have a static image. Pixel shifting can be imperceptible to a viewer and still prevent image retention and burn-ins on the display. Pixel shifting in a typical display can shift a pixel from one sub-pixel group to the next, such that all of the sub-pixels in each group are in the on state during the pixel shifting. For example, all of the sub-pixels in a first group of sub-pixels can be in an on state to create a first pixel in an image, and all of the sub-pixels in a second group of sub-pixels can be in an on state to create a second pixel in the image. Then in response to pixel shifting the first pixel can be shifted to the second sub-pixel group, such that all of the sub-pixels in the second group of sub-pixels can be in an on state to create the first pixel in the image after pixel shifting. Thus, each sub-pixel, such as the red, green, and blue sub-pixels, in a typical display is provided with current during each shift of the image during the pixel shifting. 
     Display  100  can perform pixel shifting by shifting the image by one or two pixels horizontally. For example, a first pixel can be created at a location  108  in an image on display  100  in response to the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106 , located within the box identified with the  108  in  FIG. 1 , being provided with current and placed in an on state. In this example, the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106  can be provided with different current levels to have the desired blend of the three sub-pixels to create the color of the first pixel at location  108 . The display  100  can then perform pixel shifting, and the first pixel can shift horizontally from location  108  to the location identified by the box  108   a  in  FIG. 1 . When the first pixel is shifted to location  108   a  the first pixel is created by the combination of the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106  within the box  108   a . In this situation, the green sub-pixel  106  is shared by the first pixel in both locations  108  and  108   a . In an embodiment, the image on the display  100  can be pixel shifted again and the location of the first pixel can shift to location  108   b . At this location, the first pixel is created by the combination of the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106  within the box  108   b , such that a red sub-pixel is shared by the first pixel while in both location  108   a  and  108   b . Thus, the red sub-pixels  102  and the green sub-pixels  106  are shared between pixel shifting locations. However, the blue sub-pixels  104  are not shared between pixel shifting locations. 
     Display  100  can perform pixel shifting in a second pixel. For example, the second pixel can be created at a location  110  on display  100  in response to the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106 , located within the box identified with the  110  in  FIG. 1 , being provided with current and placed in an on state. The display  100  can then perform pixel shifting, and the second pixel can shift horizontally from location  110  to the location identified by the box  110   a  in  FIG. 1 . When the second pixel is shifted to location  110   a  the second pixel is created by the combination of the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106  within the box  110   a . In this situation, the green sub-pixel  106  is shared by the second pixel in both locations  110  and  110   a . In an embodiment, the image on the display  100  can be pixel shifted again and the location of the second pixel can shift to location  110   b . At this location, the second pixel is created by the combination of the red sub-pixel  102 , the blue sub-pixel  104 , and the green sub-pixel  106  within the box  110   b , such that a red sub-pixel is shared by the second pixel while in both location  110   a  and  110   b . Thus, the red sub-pixels  102  and the green sub-pixels  106  are shared between pixel shifting locations. However, the blue sub-pixels  104  are not shared between pixel shifting locations. 
     Depending on a material usage some of display configurations there can be a 3:1 differential in the degradation of the sub-pixels between blue sub-pixels  104  and red sub-pixels  102 . Also, there can be a 2:1 differential in the degradation of the sub-pixels between blue sub-pixels  104  and green sub-pixels  106 . The sub-pixel arrangement on display  100 , can enable the blue sub-pixels  104  to be in an off state half the time in response to the blue sub-pixels not being shared between pixel shifting locations, such as between location  108  and  108   a , and between location  108   a  and  108   b . The reduced amount of time that the blue sub-pixels  104  are as compared to the red sub-pixels  102  can lower the degradation difference between the blue sub-pixels and the red sub-pixels. Similarly, reduced amount of time that the blue sub-pixels  104  are as compared to the green sub-pixels  106  can lower the degradation difference between the blue sub-pixels and the green sub-pixels. 
     In an embodiment, each pixel can include four sub-pixels. For example, a pixel can include, in order horizontally across a row, one red sub-pixel  102 , one blue sub-pixel  104 , one green sub-pixel  106 , and another blue sub-pixel  104 . In this embodiment, each blue sub-pixel  104  may be powered on a 50% of the total overall power capacity for the pixel color. Thus, the life time degradation of the blue sub-pixels  104  can be reduced in response to the blue sub-pixels  104  being driven at 50% rather than 100%. Also, in this embodiment, pixel shifting can move from one set of four sub-pixels to an adjacent group of four sub-pixels either vertically or horizontally. In this situation, there pixel shifting can result without any of the sub-pixels being reused from one pixel location to the next. 
     In an embodiment, the resolution, pixels per inch (PPI), of the display  100  can be above visible range. For example, the resolution can be 300 PPI×1.4423=424 PPI. In an embodiment, the high resolution of the display  100  can enable the blue sub-pixels  106  in the off state to not be visible. Additionally, the resolution of the display  100  can make the pixel shifting of the image not be visible. The display  100  can have additional blue sub-pixels as compared to typical displays, such that the display  100  can include additional rows and/or columns as compared to a typical display to enable pixel shifting in the display  100 . For example, a typical display may only include the sub-pixels located with box  112 . However, display  100  can include additional columns sub-pixels  114 ,  116 , and  118 , and an additional row of sub-pixels  120  to enable pixel shifting with the additional blue sub-pixels  104 . 
       FIGS. 2 and 3  illustrate a first manufacturing mask  230  on a substrate  200  of a display in accordance with at least one embodiment of the present disclosure. The substrate  200  can be a first type of semiconductor material, such as n-type or a p-type. The mask  230  is then applied on top of the substrate. In an embodiment, the mask  230  includes a plurality of holes  232  to enable red sub-pixels to be added to the substrate  200 .  FIG. 3  illustrates a cross section of the substrate  200  and the mask  230  taken along the line A-A in accordance with at least one embodiment of the present disclosure. 
     Referring now to  FIG. 3 , the substrate  200  can be doped, such as through ion implantation, diffusion of dopants, epitaxy, or the like, with an opposite type of semiconductor material as compared to the substrate to create a p-n junction. In an embodiment, the material used to dope the substrate can be selected based on the sub-pixels being red sub-pixels  302 . For example, the sub-pixels created during this manufacturing step can be created using aluminum gallium arsenide (AlGaAS), gallium arsenide phosphide (GaAsP), aluminum gallium indium phosphide (AlGaInP), gallium (III) phosphide (GaP), or the like. The openings  232  in the mask  230  allow the substrate  200  to be doped at the desired location to create red sub-pixels  302 . Thus, all of the red sub-pixels  302  are created in the substrate during the same manufacturing step. 
       FIGS. 4 and 5  illustrate a second manufacturing mask  440  on a substrate  400  of a display in accordance with at least one embodiment of the present disclosure. The substrate  400  can be a first type of semiconductor material, such as n-type or a p-type. The mask  440  is then applied on top of the substrate. In an embodiment, the mask  440  includes a plurality of holes  444  to enable blue sub-pixels to be added to the substrate  400 .  FIG. 5  illustrates a cross section of the substrate  400  and the mask  440  taken along the line B-B in accordance with at least one embodiment of the present disclosure. 
     Referring now to  FIG. 5 , the substrate  400  can be doped with an opposite type of semiconductor material as compared to the substrate to create a p-n junction. In an embodiment, the material used to dope the substrate can be selected based on the sub-pixels being blue sub-pixels  504 . For example, the sub-pixels created during this manufacturing step can be created using zinc selenide (ZnSe), indium gallium nitride (InGaN), or the like. The openings  444  in the mask  440  allow the substrate  400  to be doped at the desired location to create blue sub-pixels  504 . Thus, all of the blue sub-pixels  504  are created in the substrate during the same manufacturing step. In an embodiment, there can be twice as many blue sub-pixels  504  as red sub-pixels as shown in  FIG. 5 . 
       FIGS. 6 and 7  illustrate a third manufacturing mask  650  on a substrate  600  of a display in accordance with at least one embodiment of the present disclosure. The substrate  600  can be a first type of semiconductor material, such as n-type or a p-type. The mask  650  is then applied on top of the substrate. In an embodiment, the mask  650  includes a plurality of holes  656  to enable green sub-pixels to be added to the substrate  600 .  FIG. 7  illustrates a cross section of the substrate  600  and the mask  650  taken along the line C-C in accordance with at least one embodiment of the present disclosure. 
     Referring now to  FIG. 7 , the substrate  600  can be doped with an opposite type of semiconductor material as compared to the substrate to create a p-n junction. In an embodiment, the material used to dope the substrate can be selected based on the sub-pixels being green sub-pixels  706 . For example, the sub-pixels created during this manufacturing step can be created using gallium (III) phosphide (GaP), aluminium gallium indium phosphide (AlGaInP), aluminium gallium phosphide (AlGaP), indium gallium nitride (InGaN), Gallium (III) nitride (GaN), or the like. The openings  656  in the mask  650  allow the substrate  600  to be doped at the desired location to create green sub-pixels  706 . Thus, all of the green sub-pixels  706  are created in the substrate during the same manufacturing step. In an embodiment, there can be substantially the same number of green sub-pixels  706  as red sub-pixels  302 , and substantially half as many green sub-pixels  706  as blue sub-pixels  504  as shown in  FIG. 7 . 
       FIG. 8  is a diagram of another embodiment of a display  800  of an information handling system in accordance with at least one embodiment of the present disclosure. The display  800  includes multiple red sub-pixels  802 , multiple blue sub-pixels  804 , and multiple green sub-pixels  806 . A first pixel of the display  800  is created in response to one red sub-pixel  802 , one blue sub-pixel  804 , and one green sub-pixel  806  within a first location  808  being provided with a current to place the sub-pixels in an on state. 
     The sub-pixels  802 ,  804 , and  806  are arranged as diamonds in rows and column on the display  800 , such that a row includes either alternating red sub-pixels  802  and green sub-pixels  806 , or includes only blue sub-pixels  804 . For clarity and brevity, only a portion of the sub-pixels on the display have been shown in  FIG. 8 . However, one of ordinary skill in the art would recognize that the order of the sub-pixels stated above can continue across the display until a sufficient number of sub-pixels are used to provide a desired resolution of the display  800 . 
     Display  800  can perform pixel shifting by shifting the image by one or two pixels horizontally. For example, a first pixel can be created at a first location  808  in an image on display  800  in response to the red sub-pixel  802 , the blue sub-pixel  804 , and the green sub-pixel  806  located within the box identified with the  808  in  FIG. 8 . The display  800  can then perform pixel shifting and the first pixel can shift to the location identified by the box  808   a  in  FIG. 8 . When the first pixel is shifted from location  808  to location  808   a  the first pixel is created by the combination of the red sub-pixel  802 , the blue sub-pixel  804 , and the green sub-pixel  806  within the box  808   a . In this situation, the green sub-pixel  806  is shared by the first pixel in both locations  808  and  808   a . In an embodiment, the image on the display  800  can be pixel shifted again and the location of the first pixel can shift to location  808   b . At this location, the first pixel is created by the combination of the red sub-pixel  802 , the blue sub-pixel  804 , and the green sub-pixel  806  within the box  808   b , such that a red sub-pixel is shared by the first pixel while in both location  808   a  and  808   b . Thus, the red sub-pixels  802  and the green sub-pixels  806  are shared between pixel shifting locations. However, the blue sub-pixels  804  are not shared between pixel shifting locations. 
     In an embodiment, the pixel shifting can be performed in any other pattern, such as a zig-zag pattern, such that a blue sub-pixel  804  is utilized half as much as a neighboring red sub-pixel  802  and a neighboring sub-pixel  806 . The direction and pattern of the pixel shifting can be the result of the sub-pixel configuration, such that selected pixel configuration reduces the amount of time that each blue sub-pixel  804  is powered on as compared to the red sub-pixels  802  and the green sub-pixels  806 . Thus, different layout configuration of the sub-pixels  802 ,  804 , and  806  can result in a different pixel shifting configuration, such as direction and/or pattern, but each pixel shifting configuration can reduce the utilization of the blue sub-pixels  804  as compared to the red sub-pixels  802  and the green sub-pixels  806 . 
     This sub-pixel arrangement on display  800 , can enable the blue sub-pixels  804  to be in an off state half the time in response to the blue sub-pixels not being shared between pixel shifting locations, such as between location  808  and  808   a , and between location  808   a  and  808   b . The reduced amount of time that the blue sub-pixels  804  are as compared to the red sub-pixels  802  can lower the degradation difference between the blue sub-pixels and the red sub-pixels. Similarly, reduced amount of time that the blue sub-pixels  804  are as compared to the green sub-pixels  806  can lower the degradation difference between the blue sub-pixels and the green sub-pixels. In an embodiment, the resolution of the display  800  can be above visible range. In an embodiment, the high resolution of the display  800  can enable the blue sub-pixels  806  in the off state to not be visible. Additionally, the resolution of the display  800  can make the pixel shifting of the image not be visible. 
       FIG. 9  is a flow diagram of a method  900  for pixel shifting an image on a display of an information handling system. At block  902 , a first sub-pixel group is powered on in response to a pixel being in a first location of the image on the display. In an embodiment, the first sub-pixel group includes a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel. The first color sub-pixel can be a first color type, the second color sub-pixel can be a second color type, and the third sub-pixel can be a third color type. In an embodiment, the first color type can be red, the second color type can be blue, and the third color type can be green. In an embodiment, the first, second, and third color sub-pixels are placed horizontally adjacent to a color sub-pixel of another type in a row of the display. For example, the first color sub-pixel can be located at a first position, the second color sub-pixel can be located at a second position, and the third color sub-pixel can be located at a third position. 
     At block  904 , the first sub-pixel group is powered down in response to the pixel being shifted to a second location of the display. In an embodiment, the pixel is shifted from the first location to the second location during a pixel shifting operation. A second sub-pixel group is powered on in response to the pixel being shifted to the second location of the display at block  906 . In an embodiment, the second sub-pixel group includes the third color sub-pixel, a fourth color sub-pixel, and a fifth color sub-pixel. In an embodiment, the fourth color sub-pixel can be the second color type, and the fifth color sub-pixel can be the first color type. In an embodiment, the fourth color sub-pixel can be located a fourth position of the row, and the fifth color sub-pixel can be located a fifth position of the row. 
     When referred to as a “device,” a “module,” or the like, the embodiments described herein can be configured as hardware. For example, a portion of an information handling system device may be hardware such as, for example, an integrated circuit (such as an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a structured ASIC, or a device embedded on a larger chip), a card (such as a Peripheral Component Interface (PCI) card, a PCI-express card, a Personal Computer Memory Card International Association (PCMCIA) card, or other such expansion card), or a system (such as a motherboard, a system-on-a-chip (SoC), or a stand-alone device). 
     The device or module can include software, including firmware embedded at a device, such as a Pentium class or PowerPC™ brand processor, or other such device, or software capable of operating a relevant environment of the information handling system. The device or module can also include a combination of the foregoing examples of hardware or software. Note that an information handling system can include an integrated circuit or a board-level product having portions thereof that can also be any combination of hardware and software. 
     Devices, modules, resources, or programs that are in communication with one another need not be in continuous communication with each other, unless expressly specified otherwise. In addition, devices, modules, resources, or programs that are in communication with one another can communicate directly or indirectly through one or more intermediaries. 
     Although only a few exemplary embodiments have been described in detail herein, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the embodiments of the present disclosure. Accordingly, all such modifications are intended to be included within the scope of the embodiments of the present disclosure as defined in the following claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures.