Display pixel comprising light-emitting diodes and display screen having such display pixels

The display pixel with a controllable current source and electronic circuit using pulse-width and pulse-amplitude modulation addresses the issue of posterization in dark tones, achieving precise gamma decoding with reduced bandwidth and complexity.

WO2025061576A1 Publication Date: 2025-03-27ALEDIA INC
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Patent Information

Application Number
PCT/EP2024/075576
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-20
Filing Date
2024-09-12
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

Existing display systems using light-emitting diodes (LEDs) suffer from posterization, especially in dark tones, due to the limited number of bits in digital image pixel signals, which requires high bandwidth and complex pulse-width modulation operations.

Method used

A display pixel comprising at least one light-emitting diode (LED) with a controllable current source and an electronic circuit that employs pulse-width modulation and pulse-amplitude modulation to supply current pulses of varying durations and intensities, allowing for more precise gamma decoding without increasing the number of bits in the video input.

Benefits of technology

The solution effectively reduces posterization in dark tones while maintaining a low number of bits in digital image pixel signals, thereby decreasing bandwidth requirements and simplifying pulse-width modulation operations.

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Abstract

The present description concerns a display pixel (12i,j) comprising at least one light-emitting diode (LED), a controllable current source (CS) supplying said light-emitting diode (LED) with current pulses, and an electronic circuit (40) comprising a storage circuit (48) for storing at least one digital signal (R, G, B) and a driver circuit (50) configured to control the current source (CS) to supply the current pulses by pulse-width modulation and by pulse-amplitude modulation based on the digital signal (R, G, B).
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