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Image display and its driving method

一种图像显示装置、驱动方法的技术，应用在静态指示器、仪器等方向，能够解决Vth校正范围有限、Vth校正困难等问题，达到提高像质可靠性、容易阈值电压补偿、改善均一化的效果

Active Publication Date: 2010-09-29
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the region where the drift of the threshold voltage of such a driving element rapidly develops, the correction of Vth is limited, and the range of correction of Vth is naturally limited.
[0013] In addition, even when the drift of the threshold voltage of the driving element does not reach the region where the drift of the threshold voltage of the driving element rapidly develops as described above, there is a problem that when the drift of the threshold voltage of the driving element develops sporadically for each pixel, there is a problem in each pixel. Proper Vth correction is very difficult in

Method used

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  • Image display and its driving method

Examples

Experimental program
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Effect test

Embodiment 1

[0097] Figure 7 to represent figure 1 In the pixel circuit shown in , the relationship between the lighting time of the driving element Q1 and the threshold voltage shift ΔV under the condition that no reverse bias is applied to the driving element Q1 is shown. Figure 8 as well as Figure 9 to express to figure 1 The graph of the relationship between the lighting time of the driving element Q1 and the threshold voltage drift under the condition that the driving element Q1 in the pixel circuit shown in FIG. 1 is loaded with a reverse bias. in addition, Figure 8 as well as Figure 9 In the process, work repeatedly with the lighting time of 10 minutes and the non-lighting time of 20 minutes, especially Figure 8 The case where the reverse bias voltage is "-1V" is shown in , Figure 9 The case where the reverse bias voltage is "-5V" is shown in .

[0098] like Figure 7 As shown, in the case of no reverse bias, about 60 hours of continuous operation, a threshold volta...

Embodiment 2

[0105] Figure 10 and Figure 11 are respectively denoted with Figure 7 or Figure 9 A graph of the characteristics of the same situation. and Figure 10 The characteristics shown in , show the following situation: that is, repeated with the lighting time of 3 minutes and the non-lighting time of 17 minutes, continuous use of 16 hours in the daytime, 8 hours of non-lighting at night, and the non-lighting time at night , Simply open the gate, source, and drain voltages of the drive element. in addition, Figure 11 The following situation is shown in the figure: that is, repeat the lighting time of 3 minutes and the non-lighting time of 17 minutes, continue to use it for 16 hours during the day, and keep it off for 8 hours at night, and when it is not lit at night, the drain-source The inter-electrode voltage was maintained at the same potential, and a reverse bias of -5V was applied to the gate-source voltage during the first hour of non-lighting, and 0V was maintained d...

Embodiment 3

[0109] Figure 12 In order to show the characteristics in the case where the operation is repeated with a lighting time of 3 minutes and a non-lighting time of 17 minutes, and a reverse bias of -5V is applied between the gate and the source only in the first 5 minutes of non-lighting diagram. As shown in the figure, the time-dependent deterioration of the threshold voltage can be prevented even in the case where the reverse bias is applied only for the first 5 minutes of the 17 minutes of non-lighting.

[0110] Additionally, if the Figure 12 The features shown in the Figure 9 Compared with the characteristics shown in , even with the same reverse bias voltage of -5V, the loading time of the reverse bias is longer Figure 9 ( Figure 9 :20 minutes, Figure 12 : 5 minutes) On this side, the dispersion of the threshold voltage shift is smaller. In addition, if the Figure 11 The features shown in the Figure 9 Compared with the characteristics shown in the reverse biase...

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Abstract

The invention discloses an image display comprising a light emitting element (D1) emitting light through conduction, and a drive element (Q1) connected in series with the light emitting element (D1) for controlling emission thereof wherein a reverse bias is applied to the drive element (Q1) when the light emitting element (D1) is not emitting light. The reverse bias is applied to the drive element (Q1) every frame period or when all light emitting elements are not emitting light (including a time when the entire frame is not emitting light). Thus, threshold voltage shift of a drive element isreduced or made uniform pixel by pixel.

Description

technical field [0001] The present invention relates to an image display device having a light-emitting element, a driving method thereof, and a driving method of an electronic device, and particularly to an image display device capable of suppressing deterioration of the light-emitting element over time. Background technique [0002] Recently, many researchers have paid attention to an electroluminescent element (hereinafter referred to as a "light emitting element"), and in particular, studies on applying the light emitting element to an image display device or a lighting device are active. [0003] In an image display device having a light-emitting element as described above, for example, a thin film transistor (Thin Film Transistor: hereinafter abbreviated as "TFT") formed of amorphous silicon or polysilicon or the like constitutes each pixel together with the light-emitting element. TFT control, to set an appropriate current value for the light-emitting element, and to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/30H01L51/50G09G3/20
Inventor 莲见太朗小林芳直加纳圭吾
Owner LG DISPLAY CO LTD
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