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Dot Matrix Display Illumination Disclosure Number: IPCOM000021857D
Original Publication Date: 2004-Mar-25
Included in the Prior Art Database: 2004-Mar-25

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Today's multi-color dot matrix displays show a not illuminated area between different color zones (cf. Fig. 1). To split the color zones, a nontransparent material is used (e.g. PP or ABS). In such a display, this area typically measures 1 to 1.5mm (cf. Fig. 1 and Fig. 2). To reduce the boundary zone it is proposed to use a transparent material (e.g. PC/PMMA) and a thin layer of white and black printing as boundary wall. An example is illustrated in Fig. 3. Since the nontransparent part of the wall is smaller (only the thin layer), the not illuminated area on the display gets smaller, too (e.g. about 20┬Ám). The black and the white layer ('White Printing', 'Black Printing' in Fig. 3) can for example be implemented by lining or by printing the transparent material with the respective color. As it is shown in Fig. 4, the nontransparent layer ('Printing area' in Fig. 4) can be located between the dots of the display ('LCD-DOTs' in Fig. 4), whereas the transparent material can overlap the dots of the display.