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Display device and method for manufacturing same

A display device and display panel technology, which is applied in the direction of identification devices, static indicators, instruments, etc., can solve problems such as bright spots and display line defects in the display part, and achieve the effect of reliable repair and reliable connection

Active Publication Date: 2021-11-19
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pixel circuits that include transistors that do not work properly, such as organic EL elements, are always turned off and become black spots, or are always turned on and become bright spots
In addition, the pixel circuit emits light at a luminance different from the luminance corresponding to the data signal and becomes an abnormal gradation, or a plurality of consecutive pixel circuits becomes an abnormal gradation, thereby displaying a line defect on the display portion.

Method used

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  • Display device and method for manufacturing same
  • Display device and method for manufacturing same
  • Display device and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ＞

[0041]

[0042] figure 1 It is a block diagram showing the overall configuration of the organic EL display device according to the first embodiment. Such as figure 1 As shown, an organic EL display device (hereinafter simply referred to as a "display device") includes a display unit 10 , a display control circuit 20 , a data line driver 30 , a scanning line driver 50 , and an emission line driver 60 . figure 1 In the illustrated organic EL display device, a data signal is directly supplied from a data line driver 30 to each data line. In this embodiment, the data line driver circuit is realized by the data line driver 30 , the scan line driver circuit is realized by the scan line driver 50 , and the light emission control line driver circuit is realized by the emission line driver 60 .

[0043] m (m is an integer greater than or equal to 2) data lines D1 to Dm, and n (n is an integer greater than or equal to 2) scanning lines S1 to Sn are arranged on the display panel 10 ....

no. 2 approach ＞

[0094] In the first embodiment, the driving current flowing from the high-level power supply line ELVDD through the power supply transistor T5, the driving transistor T4, and the light emission control transistor T6 is not supplied to the organic EL element OLED, but is passed through the second initialization transistor T7. A connection portion CP between a conduction terminal and the initialization line Vini flows into the initialization line Vini. In this case, although the pixel circuit 11 can be blackened, the on-resistance of these transistors T5, T4, and T6 is small, so the current value becomes large. Therefore, there is a problem that the power consumption of the pixel circuit 11 becomes large. Therefore, in the present embodiment, a repair method for reducing power consumption of the pixel circuit 11 that can not only make the pixel circuit 11 black dots but also further make black dots will be described. In addition, the configuration of the display device of this ...

no. 3 approach ＞

[0119] A third embodiment of the present invention will be described. In this embodiment, when the second initialization transistor T7 described in the first embodiment malfunctions, and even when the writing transistor T3 malfunctions, it is possible to repair the pixel circuit 11 reliably to black spots. Be explained. In addition, the configuration of the display device of this embodiment, the configuration of the pixel circuit 11 , and the operation of the pixel circuit 11 are the same as those of the first embodiment, and therefore descriptions thereof are omitted.

[0120] With regard to the repair when only the second initialization transistor T7 becomes malfunctioning, as described in the first embodiment, the first conduction terminal of the second initialization transistor T7 and the initialization line Vini are connected by irradiating laser light to the organic EL element OLED. The anode of the applied initialization potential Vini. As a result, the organic EL ele...

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Abstract

Laser light is applied from the rear side of an insulating substrate 90 onto the portion where a semiconductor layer SI which constitutes a first conduction terminal of a second initialization transistor T7 and an initialization wire Vini overlap each other with an insulating film therebetween. This causes a gate insulating film 91 and a first interlayer insulating film 92 that are interposed between the semiconductor layer SI and the initialization wire Vini to vaporize and disappear, connecting the laser-applied area LA of the semiconductor layer SI with the initialization wire Vini and creating a connected portion CP. Since an initialization potential Vini will be applied to the anode of an organic EL element OLED as a result, the voltage applied to the organic EL element OLED will be lower than or equal to a threshold voltage. Therefore, the organic EL element OLED will constantly be in an unlighted state regardless of any of the transistors that constitute a pixel circuit 11 being constantly on or off, and the pixel circuit 11 will be constantly black.

Description

technical field [0001] The following disclosure relates to a display device and a manufacturing method thereof, and more specifically, to a display device including an electro-optical element driven by an electric current, such as an organic EL (Electro Luminescence) display device, and a manufacturing method thereof. Background technique [0002] An organic EL display device has attracted attention as a display device characterized by thinness, high image quality, and low power consumption, and its development is currently being actively carried out. A display panel for displaying an image in an organic EL display device includes: a display portion in which a plurality of pixel circuits are arranged; and a frame in which a driving circuit for driving each pixel circuit is arranged. [0003] The pixel circuit includes a plurality of thin film transistors. If all these transistors operate normally, the pixel circuit emits light with a brightness corresponding to the data sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F9/30G09F9/00G09G3/3233
CPCG09F9/00G09G3/3233G09F9/30G09G2310/0262G09G2300/0861G09G2310/0251G09G2300/0819G09G3/3266G09G3/3275G09G2310/0278
Inventor 古川智朗
Owner SHARP KK