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Organic EL panel drive circuit and organic EL display device using the same drive circuit

An electroluminescent display and electroluminescent panel technology, which is applied in the fields of organic EL displays and organic electroluminescent element drive circuits, can solve the problems such as the impossibility to fully limit the brightness change of the display screen of the organic EL display panel, and achieve physical The effect of reducing the difference in characteristics

Inactive Publication Date: 2008-04-09
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Even if the reference current is distributed by arranging the input-side transistor of the current mirror circuit at the central portion of the output-side transistor, as disclosed in U.S. Patent No. 6,586,888, it is impossible to sufficiently limit the luminance variation of the display screen of the organic EL display panel

Method used

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  • Organic EL panel drive circuit and organic EL display device using the same drive circuit
  • Organic EL panel drive circuit and organic EL display device using the same drive circuit
  • Organic EL panel drive circuit and organic EL display device using the same drive circuit

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Embodiment Construction

[0040] are described with the same reference numerals respectively figure 1 and image 3 The constituent elements shown in Fig. 4(a)-4(c) are the same as those shown in Figs. 4(a)-4(c).

[0041] figure 1 The layout of the unit transistor blocks formed in the transistor block formation region 7 of the column drive circuit IC 10 of the organic EL drive circuit according to the embodiment of the present invention is shown. exist figure 1 , reference numeral 10a describes a layout of unit transistor blocks each including unit transistors constituting a digital-to-analog converter circuit and an output stage current source, which are provided corresponding to terminal pins of the organic EL display panel.

[0042] The transistor block 3 includes two columns of transistors, similar to the transistor block 3 shown in FIG. 4( a ), each of which includes 42 unit transistors. The hatched transistor blocks 6 each similar to the transistor block 3 are dummy blocks constituting a du...

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Abstract

The invention relates to an organic electroluminescent board drive circuit, which is characterized in that: a non-operation dummy circuit is positioned at a transistor block at the outermost part of the drive circuit forming area of an integrated circuit (IC). The stress in relation to the physical characteristics of the element transistor formed at the transistor block at the areas between the outermost transistor blocks and can be formed into a digital-to-analog converter circuit or a digital-to-analog converter circuit and an output stage current source is quite smooth, thereby a current mirror circuit comprising the digital-to-analog converter circuit can be formed by the element transistor with a good matching property.

Description

technical field [0001] The invention relates to an organic electroluminescence (electro luminescent-EL) element driving circuit and an organic EL display using the organic EL element driving circuit. In particular, the present invention relates to a circuit layout of a current driving circuit for passing a current generated by a digital-to-analog converter circuit constituted by a current mirror circuit (current mirror circuit) to an organic EL display having The terminal pin of the EL plate is connected to the organic EL element of the anode of the column line of the organic EL plate to drive, and the circuit layout of the current driving circuit can reduce the brightness change of the organic EL element, so as to reduce the impact of the brightness change on each The effect of brightness variation on an organic EL display. Background technique [0002] An organic EL display panel of an organic electroluminescence (EL) display has been proposed, which is mounted on a cellu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/30H05B33/08G09F9/30G09G3/32H05B33/00H05B44/00
CPCH01L27/3223H01L27/3244H01L27/3281G09G2310/027G09G3/3283G09G2320/0233H10K59/88H10K59/12H10K59/17G09G3/30H05B33/00
Inventor 前出淳阿部真一藤川昭夫藤泽雅宪
Owner ROHM CO LTD