Method and apparatus for expanding dynamic range of display device

一种显示器、适配的技术，应用在静态指示器、图像数据处理、仪器等方向，能够解决高成本、不能实现HDR显示装置、亮度特性线性增大等问题

Inactive Publication Date: 2016-05-18
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology uses two LCD panels, resulting in thicker thickness and higher cost
In addition, this technology enhances contrast by making dark images darker instead of bright images brighter, so that this technology cannot achieve a true HDR display device
[0006] Enhancing contrast simply by using local dimming can result in a linear increase in brightness characteristics, potentially causing a brightness increase in mid-grays
Therefore, if only local dimming is used to increase the contrast, the viewer will perceive the image as harsh

Method used

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  • Method and apparatus for expanding dynamic range of display device
  • Method and apparatus for expanding dynamic range of display device

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Embodiment Construction

[0021] The display device of the present invention may be a flat display device having white sub-pixels (hereinafter referred to as "W sub-pixels") emitting white light, such as an RGBW type LCD device.

[0022] The present invention expresses a bright image more brightly using an RGBW type LCD device, thereby expanding an upper dynamic range. The present invention adjusts the transfer function curve according to the input image on the basis of the local area unit, so as to enlarge the contrast ratio of the local area, and uses this method associated with the local dimming method for the backlight. Here, the transfer function curve is used to adjust the gamma characteristics of the pixel data.

[0023] The following description is provided to assist the reader in gaining an overall understanding of the methods, devices and / or systems described herein. Accordingly, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be ...

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PUM

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Abstract

A method and an apparatus for expanding a dynamic range of a display device are disclosed. The apparatus generates pixel data in a display. RGB pixel data is received corresponding to a target pixel of an image. A local adaption level is determined for the RGB pixel data representing perceived brightness of the RGB pixel data. The local adaption level is modified to generate a modified local adaption level. A transfer curve is generated based on the modified local adaption level and the transfer curve is applied to the input RGB pixel data. A local dimming value is generated to drive a light source driver of the display based on RGB pixel data for each of the pixels in the local dimming block and RGBW pixel data for each of the pixels in the local dimming block.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2014-0155677 filed on Nov. 10, 2014, which is incorporated by reference in its entirety into this application for all purposes as if fully described therein Same. technical field [0002] The present invention relates to a method and a device for expanding the dynamic range of a display device in order to achieve High Dynamic Range (High Dynamic Range; HDR) using an RGBW type pixel array. Background technique [0003] Active matrix type liquid crystal display (LCD) devices are switching devices that display images using thin film transistors (TFTs). The LCD device includes a display panel and a backlight unit that irradiates light on the display panel. [0004] There is an increasing demand for HDR display devices, which display reproduced images to make a user feel as if he is watching a real scene. The HDR display device requires a physical ability to ensure the brightness of thousands of nits...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG06T2207/20021G09G3/3648G09G2300/0452G09G2320/0271G09G2320/0276G06T2207/20208G06T5/94G06T2207/20028G06F18/22G06T5/92
Inventor 权耕准
Owner LG DISPLAY CO LTD
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