Display device

The display device uses a reference current generation circuit and current mirror transistors to generate light-emitting currents, addressing capacitor limitations and data conversion needs, enhancing luminance and contrast while reducing power consumption.

EP4773126A1Pending Publication Date: 2026-07-08YAS CO LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
YAS CO LTD
Filing Date
2024-08-27
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Existing display devices require capacitors in each pixel, leading to area limitations and additional problems, and necessitate a display driving circuit for converting digital data into analog data.

Method used

A display device with a reference current generation circuit and light-emitting circuits that generate light-emitting currents using a reference current, eliminating the need for capacitors and allowing digital data to control emission time, and utilizing a current mirror circuit with transistors to adjust luminance.

Benefits of technology

This design reduces the size of the light-emitting circuit, increases luminance, improves contrast ratio, and minimizes power consumption by eliminating the need for capacitors and data converters, while ensuring accurate luminance control and preventing image quality deterioration.

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Abstract

The display device may include a reference current generation circuit and a plurality of light-emitting circuits. The reference current generation circuit may include a constant current source that generates a reference current. The plurality of light-emitting circuits may be provided in a plurality of subpixels and may be electrically connected to the reference current generation circuit. The plurality of light-emitting circuits may each generate a light-emitting current by using the reference current to emit light from a light-emitting element, and may control an emission time of the light-emitting element by using digital data and a program signal. The reference current and the light-emitting current may be constant currents.
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