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Display device and method of driving display device

a display device and display device technology, applied in the field of active matrix display devices, can solve the problems of affecting the power consumption of organic el displays, affecting the miniaturization of devices, and affecting the lowering of power consumption, and achieve the effect of excellent power consumption reducing

Active Publication Date: 2014-07-01
JOLED INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]One or more exemplary embodiments of the present disclosure can provide of a display device having excellent power consumption reducing effect.

Problems solved by technology

Specifically, unlike liquid crystal displays, the power consumption of organic EL displays varies significantly depending on the displayed image.
However, because power source circuit design and battery capacity entail designing which assumes the case where the power consumption of a display becomes highest, it is necessary to consider power consumption that is 3 to 4 times that for the typical natural image, and thus becoming a hindrance to the lowering of power consumption and the miniaturization of devices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0076]The display device according to an exemplary embodiment of the present disclosure includes: a power supplying unit configured to output a high-side output potential and a low-side output potential; a display unit in which a plurality of pixels are arranged and which receives power supply from the power supplying unit; a voltage detecting unit configured to detect at least one of a high-side applied potential and a low-side applied potential which are applied to at least one of the pixels inside the display unit; and a voltage regulating unit configured to regulate at least one of the high-side output potential and the low-side output potential that are outputted from the power supplying unit such that any one of the following potential differences reaches a predetermined potential difference: a potential difference between the high-side applied potential and a reference potential; a potential difference between the low-side applied potential and the reference potential; and a ...

embodiment 2

[0148]Compared to the display device according to Embodiment 1, a display device according to this embodiment is different in that the reference voltage that is inputted to a variable-voltage source changes depending on a peak signal detected, for each frame, from the inputted video data. Hereinafter, description shall not be repeated for points which are the same as in Embodiment 1 and shall be centered on the points of difference from Embodiment 1. Furthermore, the figures applied to Embodiment 1 shall be used for figures that would otherwise overlap with those in Embodiment 1.

[0149]Hereinafter, Embodiment 2 of the present disclosure shall be specifically described with reference to the Drawings.

[0150]FIG. 10 is a block diagram showing an outline configuration of the display device according to Embodiment 2 of the present disclosure.

[0151]A display device 100 shown in the figure includes the organic electroluminescence (EL) display unit 110, the data line driving circuit 120, the ...

embodiment 3

[0174]Compared to the display device 100 according to Embodiment 2, a display device according to the present embodiment is different in measuring the high-side potential of each of two or more luminescent pixels 111, and regulating the variable-voltage source 180 based on the lowest potential out of the measured potentials and the reference potential.

[0175]With this, the output voltage Vout of the variable-voltage source 180 can be more appropriately regulated. Therefore, power consumption can be effectively reduced even when the size of the organic EL display unit is increased.

[0176]FIG. 13 is a block diagram showing an example of an outline configuration of the display device according to Embodiment 3 of the present disclosure.

[0177]A display device 300A according to this embodiment shown in the figure is nearly the same as the display device 100 according to Embodiment 2 shown in FIG. 10, but is different compared to the display device 100 in further including a potential compar...

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PUM

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Abstract

A display device includes: a reference voltage setting unit, an organic EL display unit; a monitor wire and sample-and-hold circuit which detect at least one of a high-side potential and a low-side potential applied to at least one pixel inside the organic EL display unit; and a variable-voltage source which regulates at least one of a high-side output potential and a low-side output potential outputted from the reference voltage setting unit. The monitor wire and the sample-and-hold circuit perform the detection of the at least one of the high-side potential and the low-side potential in at least part of an image display period, and the monitor wire and the sample-and-hold circuit do not perform the detection of the at least one of the high-side potential and the low-side potential in a black display period.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This is a continuation application of PCT Patent Application No. PCT / JP2011 / 003989 filed on Jul. 12, 2011, designating the United States of America. The entire disclosure of the above-identified application, including the specification, drawings and claims are incorporated herein by reference in its entirety.TECHNICAL FIELD[0002]Devices consistent with exemplary embodiments relate to active-matrix display devices which use current-driven luminescence elements represented by organic electroluminescence (EL) elements, and more particularly to a display device having excellent power consumption reducing effect.BACKGROUND ART[0003]In general, the luminance of an organic electroluminescence (EL) element is dependent upon the drive current supplied to the element, and the luminance of the luminescence of the element increases in proportion to the drive current. Therefore, the power consumption of displays made up of organic EL elements is determ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06F3/038G09G5/00
Inventor KATO, TOSHIYUKIEBISUNO, KOUHEI
Owner JOLED INC