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Display material with good low-temperature stability

A compound and carbon atom technology, applied in the field of display materials, can solve the problems of unsatisfactory contrast and viewing angle, short response time, and smectic equivalence

Active Publication Date: 2021-09-24
ZHEJIANG AUTOMOBILE INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TN and STN display modes have short response time and wide operating temperature, but the contrast ratio and viewing angle are not ideal
VA display mode has the characteristics of wide viewing angle and high contrast, but it is easy to crystallize or appear smectic phase at low temperature, and the low temperature response time is slightly longer

Method used

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  • Display material with good low-temperature stability
  • Display material with good low-temperature stability
  • Display material with good low-temperature stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062]

[0063] Δn=0.097; Δε=-4.2; Cp=81.9; γ1=84.

Embodiment 2

[0065]

Embodiment 3

[0067]

[0068] Further, in order to test the low-temperature stability of Example 1, the display material is filled into a 6 μm thick VA test box (the inner surface of the upper and lower substrates has a polyimide PI alignment layer) for an automobile full liquid crystal instrument panel, and it is placed in In a refrigerator at -20°C, observe whether crystals or smectic phases appear in the VA test box at regular intervals to determine the duration of low-temperature stability, that is, the retention time of the last observed phase stability (LTS, h).

[0069] On the other hand, the response time (τ, ms) is the sum of the rise time and fall time of the VA test box at -20°C and 6V driving voltage; the former is defined as the time when the transmittance rises from 10% of the maximum transmittance until it reaches 90%. Time; the latter is the time when the transmittance decreases from 90% of the maximum transmittance until it reaches 10%.

[0070] See Table 1 for the resul...

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PUM

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Abstract

Disclosed is a display material comprising at least one compound of formula I, at least one compound of formula II, and at least one compound of formula III. Different monomers using specific proportions and specific structures, in particular specific cyclic units and pendant groups, are combined; compared with the prior art, the display material has better low-temperature stability.

Description

technical field [0001] The invention belongs to the technical field of display materials, and in particular relates to a display material with good low-temperature stability. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, automobiles have become the main means of transportation for ordinary families. As a device that reflects the working conditions of various systems in the car, the car dashboard is one of the most frequently touched car parts. Traditionally, the speed, water temperature, oil quantity, and speed per hour are all displayed on mechanical dashboards. The characteristic of the mechanical instrument panel is that the technology is stable, mature and reliable. [0003] However, in recent years, due to the rapid development of automobiles, communications and display technologies, people need more intuitive and modern display devices to meet people's instant communication, navigation and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/44
CPCC09K19/3066C09K19/44C09K2019/0466
Inventor 沈瑜毛林峰应松钱华华陈烈群赵旭栋冯勇
Owner ZHEJIANG AUTOMOBILE INSTR