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Colour electroluminescent display devices

An electroluminescent display and color technology, which is applied in the direction of circuits, electrical components, and electrical solid-state devices, and can solve problems such as different performances

Inactive Publication Date: 2008-09-03
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was found that the problems with the display quality achieved were still evident, especially the problem of different color pixels showing different performance

Method used

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  • Colour electroluminescent display devices
  • Colour electroluminescent display devices
  • Colour electroluminescent display devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] refer to figure 1 , a color active-matrix electroluminescent display device comprising a panel having a matrix array of rows and columns of regularly spaced display pixels (indicated by squares 10), each display pixel comprising a display element and an associated device for controlling the current flowing through the display element. drive means and are located at each intersection between intersecting row (select) 12 and column (data) 14 addressing wires or groups of lines. Only a few pixels are shown here for simplicity. The pixels 10 are addressed through the addressing wire groups by a peripheral driving circuit including a row scanning driving circuit 16 and a column data driving circuit 18 connected to the ends of each wire group. In operation, within a frame period, each row of pixels is sequentially addressed by means of a select signal applied by circuit 16 to the associated row conductor 12, so that the row of pixels is loaded with the corresponding The dat...

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Abstract

A colour active matrix electroluminescent (EL) display device has an array of pixels (10) comprising sets of red, green and blue emitting pixels, each of which pixels comprises an EL display element (20), a drive transistor (22) for driving a current through the display element, a storage capacitor (24) for storing a voltage used for addressing the drive transistor, and a discharge photosensitive element (40, 42) for discharging the storage capacitor in dependence on the light output of the display element. The discharge photosensitive elements (42) in the set of blue pixels comprise lateral photosensitive thin film devices, such as lateral thin film transistors or gated or ungated lateral photodiode devices, while the discharge photosensitive elements (40) in the set of red pixels, and preferably the set of green pixels as well, comprise vertical p i n photodiodes (40). The selection of the photosensitive elements in this manner leads to enhanced colour - related photo-sensitivity, and thus improved display device performance.

Description

technical field [0001] The invention relates to a color electroluminescent display device, in particular an active matrix display device having an array of pixels, wherein the pixels comprise light emitting electroluminescent display elements and thin film transistors. More particularly, the present invention relates to a color active matrix electroluminescent display device, the pixels of which include photosensitive elements responsive to light emitted by the display elements and used to control the actuation of the display elements. Background technique [0002] Color matrix display devices employing electroluminescent, light-emitting display elements are well known. Display elements generally comprise organic thin film electroluminescent elements (OLEDs), comprising polymeric materials (PLEDs) or light emitting diodes (LEDs). For a full-color display, the array typically includes three sets of pixels that emit red, green, and blue light from the display element. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G5/02H01L27/32
CPCG09G5/02G09G2300/0842H01L27/3269G09G2320/029G09G2300/088G09G2320/045G09G2320/043G09G2300/0809G09G3/3208H01L27/3211G09G3/3233G09G2300/0819G09G2360/148H01L31/105H10K59/35H10K59/13G09G3/30G09G3/32
Inventor N·D·杨
Owner KONINKLIJKE PHILIPS ELECTRONICS NV