Backlight liquid crystal display

Abstract

The invention relates to a display module (11) comprising a backlit liquid crystal cell (17) like one located, in particular, in the operating panel of a large household appliance. A particularly economical design is achieved when the height of module (11) is determined by the tensioning of a frame (27), which surrounds the liquid crystal cell (17) and the light guide plate (19), against a circuit support (12) whose surface is provided in the form of a reflector surface (20) upon which the light guide plate (19) rests. The circuit support (12) is preferably manufactured using MID (molded interconnect device) technology in the form of an injection molded part with integrated conductor paths (15) and a molded holding fixture (22) provided for holding the light guide plate (19). The frame (27), which can be slipped over the sandwich structure consisting of the light guide plate (19) and liquid crystal cell (17), is coupled via a film hinge (41) to the injection molded part while forming one piece. The fastening between the frame (27) and the circuit support (12) is effected by elastically arresting barbs (34) with the passing through of positioning posts (43) whose free faces are hot-pressed in order to fix the position.

Description

technical field [0001] The invention relates to a liquid crystal display. Background technique [0002] Such a display is known, for example, from JP 10-153764. In this, the liquid crystal cell is integrated in an H-shaped structure, the cross-arms of which constitute the optically active cell, and the limbs of which act as spacers between the glass plate and the circuit carrier, said glass plate being placed in the Viewing the side above, the circuit carrier is arranged below. A light guide is arranged below the optically active liquid crystal cell, which is surrounded by a reflective housing, into which light guide the light of the light-emitting diodes enters laterally. [0003] On the outside of the fingers, between the depending glass plate and the circuit carrier, there are provided rubber contacts for the electrical connection of the liquid crystal cell and the circuit carrier. This mechanical structure is completed by a box-shaped frame, which is assembled above a...

AI Technical Summary

Problems solved by technology

However, the effect of the direct light irradiation in the opposite relation to the viewing direction causes a very uneven illumination of the display area of ​​the liquid crystal display, because a large amount of light enters the liquid crystal cells in the opening area of ​​the circuit board, but is to be illuminated The farther the display area is from the opening, the progressively dimmer the illumination thereafter

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