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Organic luminous diode display device drived by current mode and picture element structure thereof

A technology of pixel structure and current mirror, which is applied in the direction of electroluminescent light source, electric light source, lighting device, etc., can solve the problem of uneven pixel brightness and achieve the effect of maintaining gray scale brightness and optimal pixel uniformity

Active Publication Date: 2008-02-27
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, one of the main purposes of the present invention is to provide a current-driven organic light emitting diode display device and its pixel structure to solve the problem of uneven pixel brightness in the prior art.

Method used

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  • Organic luminous diode display device drived by current mode and picture element structure thereof
  • Organic luminous diode display device drived by current mode and picture element structure thereof
  • Organic luminous diode display device drived by current mode and picture element structure thereof

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Embodiment Construction

[0023] Please refer to FIG. 2 . FIG. 2 is a schematic diagram of a first embodiment of a pixel 20 in a current-driven LED display device of the present invention, wherein the LED is an organic light-emitting diode as an example. As shown in FIG. 2 , the pixel 20 includes a scan line SL, a data line DL, a capacitive storage unit C, a plurality of thin film transistors T1 , T2 , T3 , T4 , and an organic light emitting diode OLED. Please note that components with the same name (scanning line SL, data line DL, capacitive storage component C, and organic light emitting diode OLED) in FIG. 1 and FIG. 2 have the same function and operation, and will not be repeated here. As shown in FIG. 2, the thin film transistors T2 and T3 are mainly used to form a current mirror circuit (current mirror), which can drive the current flowing through the thin film transistor T2 at a current mirror ratio (mirror ratio). The thin film transistor T3, and the thin film transistors T1 and T4 are used as ...

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Abstract

The display device includes light emitting element; the first scanning line to transmit the first signal for selecting the light emitting element; data line to transmit data current signal for driving the light emitting element; the first transistor with grid connected to the first scanning line for selecting the light emitting element based on the first signal; and current mirror circuit to transmit driving current signal for driving the light emitting element based on the data current signal. The current mirror circuit includes the second transistor with grid connected to data line and the source or the drain of the first transistor for receiving the data current signal; and the third transistor with grid connected to drain or the source of the first transistor for transmitting the current signal.

Description

technical field [0001] The invention provides a display panel and its pixel structure, especially an organic light emitting diode display device driven by current and its pixel structure. Background technique [0002] Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a pixel 10 in a conventional voltage-driven OLED display device. As shown in FIG. 1, the pixel 10 includes a scan line (scan line) SL, a data line (data line) DL, a thin-film transistor (thin-film transistor, TFT) M1, a thin-film transistor M2, a capacitive storage component C, and an organic light emitting diode. Diode (organic light emitting diode) OLED, wherein as shown in Figure 1, the gate (gate) of the thin film transistor M1 is connected to the scan line SL, the drain (drain) is connected to the data line DL, and the source (source) is connected to To the gate of the thin film transistor M2 and one end of the capacitance storage component C. The drain of the thin film transistor M2 is connected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32H05B33/08G09G3/3233H05B44/00
Inventor 孙文堂
Owner AU OPTRONICS CORP