Uni-Color Data Line Layout for Lower-Power High-Rate Displays
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Solution Overview
Problem
The increase in display size and refresh frequency leads to higher power consumption and parasitic capacitance issues in flat panel displays, necessitating larger switching devices and increased power usage.
Innovation Solution
A display device with a Pentile RGBG array arrangement, where subpixels of alternating colors are connected to different column lines, reducing the need for frequent voltage level changes and minimizing parasitic capacitance by ensuring column lines control emissive elements of a single color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the length of the display is increased to achieve larger screen sizes, then the display area is improved, but the parasitic capacitance of column data lines increases leading to higher power consumption
Solution Approach 1:
The patent segments the column data lines by color, creating separate column lines for red, green, and blue subpixels. This segmentation reduces the switching frequency requirements for each individual column line, thereby reducing dynamic power consumption while maintaining the ability to drive all subpixels across the large display area
Solution Approach 2:
The patent implements dynamic column line switching where column lines are selectively activated based on the color of subpixels being updated. By switching column lines dynamically rather than continuously, the patent reduces the average switching frequency and associated power consumption in large displays
2Productivity
If the frame rate is increased to achieve higher refresh frequencies, then the display performance is improved, but the switching frequency of column data lines increases linearly leading to higher power consumption
Solution Approach 1:
By segmenting column lines by color, the patent allows each color-specific column line to operate at a lower effective switching frequency. Since not all colors need to be updated simultaneously, the switching frequency for each segmented column line is reduced proportionally, decreasing power consumption while maintaining high overall frame rates
Solution Approach 2:
The patent employs periodic updating of different color subpixels using separate column lines. By organizing the updating schedule periodically and assigning specific colors to specific column lines, the system reduces the instantaneous switching frequency requirements while achieving high average frame rates through coordinated periodic updates
3Reliability
If larger switching devices are used to compensate for increased parasitic capacitance, then the switching capability is improved, but the power consumption increases
Solution Approach 1:
The patent segments the switching function across multiple smaller, color-specific column lines rather than using a single large switching device. Each segmented column line handles only a subset of subpixels (those of a specific color), allowing the use of smaller switching devices with lower power consumption while collectively maintaining the required switching capability for the entire display
Data Source
AI summary
A display device includes a plurality of subpixel emissive areas of a first color, a second color, and a third color arranged in an array having a plurality of rows and columns. Rows of the array include subpixel emissive areas arranged in a repeating pattern of a first color subpixel emissive area, a second color subpixel emissive area, a third color subpixel emissive area, and a second color subpixel emissive area. Alternating columns of the array include subpixel emissive areas: (a) arranged in a repeating pattern of a subpixel emissive area of the first color and a subpixel emissive areas of the third color, and (b) including only subpixel emissive areas of the second color. The display device further includes a plurality of scan lines, a plurality of column lines, and a plurality of electronic subpixel circuits arranged in the array. Each electronic subpixel circuit is configured for receiving electronical signals from a scan line and from a column line and for converting the received signals into a current signal provided to one of the subpixel emissive areas to drive light emission from the subpixel emissive area, where electronic subpixel circuits arranged in a column of the array drive columns of emissive areas having only one color.