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US 12,217,704 B2Granted
Organic light emitting display device
AssigneeLG Display Co., Ltd.
InventorHeum Il Baek
Life of this patent
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Abstract
Discussed is an organic light emitting display device capable of achieving an enhancement in blue characteristics while having subpixels having a same size by designing a blue one of the subpixels using a hole only device (HOD) structure. The blue subpixel can include two blue emission material layers stacked to form the HOD structure. The blue subpixel can driven using two data lines and two driving transistors so that the two blue emission material layers alternately emit light on a frame basis.
Claims19
An organic light emitting display device comprising:
- a display panel comprising a plurality of data lines and a plurality of scan lines intersecting each other with unit pixels arranged in a matrix format, each of the unit pixels being disposed in a region of the display panel where one scan line intersects four data lines;
- a data driving circuit configured to drive the plurality of data lines;
- and
- a gate driving circuit configured to drive the plurality of scan lines,
- wherein each of the unit pixels comprises at least three subpixels,
- wherein one subpixel of the at least three subpixels in each of the un it pixels comprises two emission material layers stacked to form a hole only device (HOD) structure,
- wherein the one subpixel is driven by two data lines,
- wherein the one subpixel further includes at least two electron transfer layers interposed between a first emission material layer and a second emission material layer of the two emission layers, and
- wherein the one subpixel further comprises:
- a first electrode and a second electrode;
- and
- a first hole injection layer, a first hole transport layer, the first emission material layer of the two emission material layers, a first electron transfer layer of the at least two electron transfer layer, a charge generation layer, a second electron transfer layer of the at least two electron transfer layer, the second emission material layer of the two emission material layers, a second hole transport layer, and a second hole injection layer that are sequentially stacked in this order between the first electrode and the second electrode.
9 more elements
An organic light emitting display device comprising:
- a display panel including a plurality of unit pixels arranged in a matrix configuration,
- wherein each unit pixel of the plurality unit pixels comprises at least three subpixels,
- wherein one subpixel of the at least three subpixels includes a first emission material layer and a second emission material layer stacked on each other, and each of the first and second emission material layers is configured to emit light having a color,
- wherein:
- when the first emission material layer is emitting light, the second emission material layer does not emit light, and
- when the second emission material layer is emitting light, the first emission material layer does not emit light,
- wherein the one subpixel further includes at least two electron transfer layers interposed between the first emission material layer and the second emission material layer, and
- wherein a charge generation layer (CGL) is directly connected to a first electron transfer layer (ETL) and a second electron transfer layer (ETL) of the at least two electron transfer layers.
5 more elements
Dependencies are inferred from the claim text.