HDR Display Drive Signal Coding for Lower-Bandwidth Bit Control
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Solution Overview
Problem
The increased dynamic range in HDR displays necessitates a larger number of bits for driving, which poses challenges in manufacturing, testing, and assembly, requiring high data bandwidth and complex silicon-based microprocessors, particularly in thin-film-transistor displays.
Innovation Solution
A method and apparatus for generating a drive signal by dividing input bits into data ranges, using a coded signal to represent the bits, and controlling current or voltage through light emitting elements with a sequence of bits, reducing the number of bits needed through pulse-width modulation and employing a driver circuit with storage and control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a larger number of bits is used for driving HDR display, then the dynamic range and brightness representation capability is improved, but the device complexity and manufacturing difficulty increases
Solution Approach 1:
The patent segments the high-bit HDR drive signal into multiple lower-bit groups that can be processed sequentially. Instead of requiring a single high-bit controller, the system divides the bit stream into manageable chunks that can be handled by simpler circuitry, reducing overall device complexity while maintaining HDR capability
Solution Approach 2:
The patent performs preliminary encoding of the HDR signal into a compressed format before display processing. By pre-processing the high-bit data into a more efficient representation, the system reduces the computational burden on the display driver circuitry, enabling HDR without requiring complex real-time processing hardware
2Illumination intensity
If a larger number of bits is used for driving HDR display, then the dynamic range is improved, but the data bandwidth requirement increases
Solution Approach 1:
The patent extracts and removes redundant information from the high-bit HDR signal through compression algorithms. By identifying and eliminating unnecessary data elements while preserving essential luminance information, the system reduces the effective data bandwidth required to transmit HDR content without sacrificing dynamic range quality
Solution Approach 2:
The patent transforms the data representation parameters by converting high-bit precision requirements into temporal or spatial domain optimizations. Through techniques such as bit-packing and variable-length encoding, the system changes how data is structured and transmitted, reducing bandwidth requirements while maintaining the necessary dynamic range for HDR display
3Productivity
If silicon based microprocessor is used to drive high speed digital signals, then the data processing capability is improved, but the ease of manufacture decreases due to technology limitations
Solution Approach 1:
The patent replaces complex silicon-based microprocessor processing with simplified logic circuitry and hardware-based encoding/decoding mechanisms. By substituting general-purpose processors with dedicated hardware circuits, the system achieves high-speed data processing suitable for HDR while remaining compatible with standard thin-film transistor manufacturing processes
Solution Approach 2:
The patent employs simple, easily manufacturable logic elements and storage circuits that can be produced through conventional thin-film technology rather than requiring expensive silicon processing. These simpler components, while individually less capable, work together in parallel to achieve the necessary processing throughput for HDR display operation
Data Source
AI summary
A method for generating a drive signal for driving a light emitting element of a display. The method includes: dividing the M bits into M−N1+1 data ranges, each including N1 consecutive bits of the M bits; determining N2 bits for uniquely identifying the M−N1+1 data ranges; generating a coded signal of N1+N2 bits for representing the M bits of the input signal; based on the coded signal, generating the drive signal comprising a sequence of N1 bits, each bit of said sequence of N1 bits controlling a current through the light emitting element or a voltage across the light emitting element, during a time interval, one bit at a time.