Light guide module and bi-stable display device having the same

Abstract

A light guide module includes a light guide plate, a light source, and a reflector. The light guide plate has a light mixed region and a visible region. The light-mixed region is at the edge of the light guide plate, and the light mixed region has a first surface and a second surface at an opposite side to the first surface. The first surface has a plurality of first concave convex structures. The light source faces the second surface of the light-mixed region. When the light source emits a light, the light enters the light mixed region from the second surface, and the light is reflected to the visible region by the first concave convex structures. The reflector covers the first concave convex structures, and plural gaps are formed between the reflector and the bottom portions of the first concave convex structures.

Description

technical field [0001] The invention relates to a light guide module and a bistable display device. Background technique [0002] In the current market of various consumer electronic products, portable electronic devices have widely used electrophoretic display devices as display screens, such as e-books. The display medium layer (or electronic ink) of the electrophoretic display device is mainly composed of electrophoretic fluid and white and black particles mixed in the electrophoretic fluid. By applying a voltage to the display medium layer, the white and black particles can be driven to move, so that each pixel can display black, white or grayscale respectively. [0003] In the prior art, the electrophoretic display device utilizes incident light to irradiate the display medium layer to achieve the purpose of display, so no backlight source is needed and power consumption can be saved. In order to expand the application of the electrophoretic display device, a front li...

AI Technical Summary

Problems solved by technology

However, in the development of display devices, thinning is the trend. When the thickness of the light guide plate is reduced to 0.25 millimeters (mm) or less, if LEDs with a thickness of 0.3 millimeters (mm) or more are still used, it will be difficult. light leakage problem

Since the LED is located on the side of the light guide plate, the direction of light leakage is the same as the light guide direction in the light guide plate, which will affect the optical taste of the visible area of ​​the light guide plate

In this way, the thickness of the LED light source will be limited by the thickness of the light guide plate, causing inconvenience to designers

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