Pixel Driving Circuit Subframe Optimization
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Solution Overview
Problem
Display devices using light-emitting diodes (LEDs) face challenges in reducing power consumption, particularly in efficiently controlling light-emission periods across multiple subframes within a frame to minimize power usage.
Innovation Solution
A pixel driving circuit is designed with a first circuit to control light-emission and non-emission of luminous elements based on control signals, and a second circuit to store bit values of multi-bit data, generating control signals for each subframe to optimize light-emitting periods, where bit strings are combined to minimize differences in subframe durations, using transistors and a level shifter for current management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multi-bit data is used to control light-emission periods across multiple subframes, then display performance and brightness control are improved, but power consumption increases
Solution Approach 1:
The patent divides multi-bit data into multiple subframes, with each subframe containing a portion of the bit data. The pixel circuit processes and stores bit values sequentially across these subframes rather than handling all bits simultaneously. This segmentation reduces the peak power consumption by distributing the data processing load across multiple time intervals while still achieving precise brightness control through the combined effect of all subframes.
2Measurement precision
If different time periods are allocated to different bits in multi-bit data, then light-emission precision is improved, but subframe duration differences increase
Solution Approach 1:
The patent implements dynamic time allocation where each bit in the multi-bit data is assigned a specific time period within its corresponding subframe. The pixel circuit is configured to process different bits at different time points, with earlier bits (more significant bits) typically allocated longer time periods and later bits (less significant bits) allocated shorter time periods. This dynamic temporal distribution achieves precise light-emission control while maintaining manageable subframe durations.
3Use of energy by moving object
If n-bit data is generated by combining bits from m-bit data where n < m, then power consumption is reduced, but data processing complexity increases
Solution Approach 1:
The patent performs preliminary organization of multi-bit data into structured formats before processing. The controller pre-arranges the m-bit data into groups that will be processed as n-bit data across multiple subframes. The pixel circuit is pre-configured with storage elements positioned to receive and hold specific bit values in predetermined locations. This preliminary structuring simplifies the actual processing operation, reducing power consumption during the critical light-emission control phase while managing complexity through systematic data organization.
Data Source
AI summary
The present embodiments disclose a pixel driving circuit. A pixel driving circuit according to an embodiment of the present disclosure is electrically connected to a luminous element and comprises a first circuit configured to control light-emission and non-emission of the luminous element in response to a control signal applied to each of a plurality of subframes included in a frame, a second circuit configured to store bit values of multi-bit data in the frame and generate the control signal based on the stored bit values, and a clock signal such that each subframe included in the frame is controlled according to each bit value, and wherein each of the plurality of subframes includes a data-writing period and a light-emitting period, during the data-writing period of each subframe, the second circuit receives and stores a corresponding bit string from among a plurality of bit strings of n-bit data, wherein the plurality of bit strings are generated by a combination of bits in the number of n, which is smaller than m, from among m bits constituting a bit string of the multi-bit data, and the n-bit data is a bit string in which n bits from among the m bits are combined such that a difference in light-emitting periods of the plurality of subframes is minimized.