Colour display device comprising an organic light-emitting diode backlighting unit and method of implementing same
A technology of light-emitting diodes and backlight units, applied in the direction of electroluminescent light sources, optical components, optics, etc., can solve problems such as solution limitations, and achieve the effect of simple adjustment
Active Publication Date: 2007-05-02
INTERDIGITAL CE PATENT HLDG +1
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Problems solved by technology
[0007] These various solutions still have limitations, especially concerning the accuracy of light reproduction or the complexity of implementation, which the present invention proposes to solve
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[0045]The backlight unit 1 using organic light emitting diodes (OLEDs) is basically planar and is a square or rectangular structure made of layers of material designed to generate light by the action of an electric current. Such cells can be fabricated using conventional fabrication techniques for OLEDs. As an example, an OLED may comprise a substrate on which is deposited a first electrode, on which is a layer of organic light-emitting material, itself covered by a second electrode layer. Sub-layers may be incorporated into the organic emissive material layer in order to facilitate electro-optical conversion. Depending on the mode of fabrication, OLED emission can occur from the back side (via the base) or from the front side (via the second electrode). Also, depending on the kind of electrode being an anode or cathode, the anode can be on the front side or the opposite side. The electrode (usually the anode) that must transmit the light generated by the OLED is usually a t...
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Abstract
The invention relates to a colour display device comprising an organic light-emitting diode backlighting unit and to a method of implementing same. From the rear forwards in the direction of a viewer, the inventive colour display device consists of: a multicolour backlighting unit (1) comprising organic light-emitting diodes (OLED), and an assembly (15) for the electro-optic switching of the backlighting by pixels, said backlighting unit taking the form of a surface having a periodic pattern comprising a group of at least three parallel, adjacent strips of light with different base colours (2, 3, 4). According to the invention, the pixels of the switching assembly and the light strips of the backlighting unit are essentially aligned such that a given pixel can be used to control the forward transmission of the only corresponding base colour. Moreover, a cylindrical lens (12) is disposed along the length of each light strip on the backlighting unit in order to form a light beam having edges (14) that are essentially parallel towards the front and through the switching assembly, the length of said lens being essentially equal to that of the light strip.
Description
technical field [0001] The present invention relates to a color display device having a backlight unit using organic light emitting diodes, and to a method of implementing the display device. The invention finds application in the field of electronically or electrically controlled displays in which light beams generated by one or more light sources are optically switched by means of pixels in order to control the display of light. More specifically, it also applies to liquid crystal displays (LCDs) or displays using optical switches via microactuators (MEMS). Background technique [0002] Displays, especially liquid crystal displays (LCDs), implementing arrays of electro-optic switches (or electro-optic modulators, these terms are equivalent), are undergoing tremendous development. In order for them to be used in any ambient light condition, there needs to be a light source to which the array of electro-optic switches can act. For this reason, in the case of color LCD disp...
Claims
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IPC IPC(8): G02F1/13357G02F1/1335
CPCG02F1/133621G02F1/133603G02B3/06G02B5/02H05B33/02H05B33/12
Inventor 菲利普·勒罗伊瓦尔特·德拉日奇让-保罗·达古瓦
Owner INTERDIGITAL CE PATENT HLDG