Braille display device based on temperature control

Abstract

The invention discloses a Braille display device based on temperature control, belonging to the field of Braille display. A Braille display screen in the device comprises a temperature-indication display array layer composed of multiple temperature-indication display units, and a semiconductor chilling plate layer composed of multiple semiconductor chilling plates, wherein the lower surface of each temperature-indication display unit is provided with one semiconductor chilling plate; moreover, the Braille display device determines the set temperature of the cold end of each semiconductor chilling plate according to the Braille contacts corresponding to character information, and compares the current temperature of the cold end of the semiconductor chilling plate with the set temperature, by PID (Proportion Integration Differentiation) regulation, a PWM (Pulse-Width Modulation) generator generates multiple groups of PWM pulses and respectively loads the pulses at two ends of each semiconductor chilling plate, thus, cold state or hot state of corresponding temperature-indication display unit is displayed, wherein when the temperature-indication unit is extremely cold, the flat points of the Braille contacts are indicated, and when the temperature-indication unit is extremely hot, the convex points of the Braille contacts are indicated. The Braille display device is simple in structure, low in manufacturing cost, excellent in stability of Braille display process and high in conversion efficiency.

Description

technical field [0001] The invention relates to a braille display device, in particular to a temperature-controlled braille display device. Background technique [0002] People with severe visual impairment or blindness are quite inconvenient when reading the Internet or other electronic information due to physical defects. It is urgent for the society to provide them with simple and practical Braille e-readers. The commonly used braille readers are all designed based on the plano-convex changes of the braille contacts. This design often has complex mechanical devices and requires high deformation strength of materials, and the manufacturing cost remains high. [0003] Traditionally, the braille display adopts a mechanical control method. For example, in the patent No. CN200510105242.8, a piezoelectric sheet is used to control and display braille. This method has a complex structure, cumbersome process, and difficult production. [0004] With the advancement of material tec...

AI Technical Summary

Problems solved by technology

However, alloy materials have the disadvantages of slow shape state change and weak mechanical strength, which seriously affect the frequency conversion and durability of Braille displays

In addition, due to the high price of alloy materials, the manufacturing cost of Braille display screens is high and it is not easy to promote

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