The painted manuscript writing board is a smart drawing product that can be used as a non-electronic display that can replace paper writing and painting by Dalian Hai Niu Technology Co., Ltd.
I. Basic principles:
Holmmaid drawing board with reflective pressure-sensitive cholesteric liquid crystal (Chiral
Nematic Liquid Crystal (Ch-LCD) display, which can maintain both bright and dark states in an unpowered state, known as a bistable display. The display does not need to increase the external light source transmission display and the constant voltage system to maintain the molecular phase of the display like the mobile phone, tablet, TV, computer, etc., so the display does not require power consumption.
By adding an optically active agent to the nematic cholesteric liquid crystal system to cause the liquid crystal molecules to have a helical structure, and the molecular axis directions of the liquid crystal molecules on the two planes are parallel, the distance is defined as a pitch, and the incident light sequentially enters the spiral liquid crystal molecules having a constant pitch. Bragg reflection of a fixed spiral period occurs, and the visible light of the corresponding wavelength is reflected to the human eye, and finally the picture or font of the corresponding color on the display screen is presented.
The peak wavelength of the reflected light is λ = nP (n is the average refractive index)
2. Work flow:
a) Erase process:
When a high voltage pulse (20V-36V) is applied to the liquid crystal substrate, the spiral liquid crystal molecules are unwound and arranged perpendicularly to the display substrate according to the direction of the electric field, and the incident light passes through the liquid crystal molecules without reflection and scattering, when the high voltage is stopped. After that, these liquid crystal molecules re-enter the transient planar spiral structure and enter a stable planar spiral structure after reverse high pressure and zero return operation. Then, after two low-voltage pulses (about 9.5V-18V, the period can be adjusted according to the temperature), the liquid crystal molecules enter the vertical spiral state from the plane spiral, and the black absorption layer in the liquid crystal substrate is directly reflected by the visible light after the incident of visible light. Absorption, the human eye sees the dark state of the black substrate, completing the erase operation.
b) writing or graffiti process
After the stylus or finger pressing, the liquid crystal molecules switch from the vertical spiral structure to the planar spiral structure. When the incident light enters the liquid crystal plane, periodic Bragg reflection occurs, and visible light of a specific wavelength is reflected to the human eye and enters the display state. The liquid crystal's sensitivity to pressure, speed and handwriting thickness can be adjusted by changing the material formulation.
Three. Product Features:
l Low power consumption, a button battery can be used for 1.5 years;
l Natural light reflection, no high-energy blue light, no radiation, no eye damage;
l Wide viewing angle, high contrast, high reflectivity, in the strong light, the side can clearly see the picture;
l Environmental protection, no pollution, saving paper;
l Children are free to graffiti, parents do not have to worry about cleaning up the mess;
l Scan the storage, save the child's memory, and upload the joy of sharing the child's growth at any time;
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