Supercharge Your Innovation With Domain-Expert AI Agents!

Dimming device

A dimming device and dimming element technology, which is applied in optics, output power conversion devices, nonlinear optics, etc., can solve the problems of low power conversion efficiency and large power consumption of dimming devices, so as to reduce power consumption Effect

Active Publication Date: 2022-08-02
TOPPAN PRINTING CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the conversion efficiency of the power supply becomes low, and the power consumption of the dimming device becomes large.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dimming device
  • Dimming device
  • Dimming device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0024] [1] Structure of the dimming device 10

[0025] figure 1 This is a block diagram of the dimming device 10 according to the first embodiment of the present invention. The dimming device 10 includes a dimming element 11 , a driving circuit 12 , a power supply circuit 13 , and a control circuit 14 .

[0026] The dimming element 11 is an element capable of controlling the transmittance of light. The light control element 11 is formed of, for example, a light control film. The light control film is a functional film that can instantaneously switch between transparent and opaque (white turbidity) by turning on / off the power supply. An example of the structure of the light control element 11 will be described later.

[0027] The driving circuit 12 applies a voltage to the dimming element 11 to drive the dimming element 11 . The circuit configuration of the drive circuit 12 will be described later.

[0028] The power supply circuit 13 receives AC power from the outside. ...

no. 2 Embodiment approach

[0109] In the second embodiment, the alternating voltage is intermittently removed locally or periodically.

[0110] Figure 12 It is a timing chart explaining the operation of the drive circuit 12 according to the second embodiment of the present invention. The operation until time t0 to t6 is the same as that of the first embodiment Figure 7 same.

[0111] like Figure 5 As shown, the intermittent rejection circuit 40 receives the output of the comparator CP3 for zero-cross detection. The cull circuit 40 sends the cull pattern to the timing generation circuit 39 .

[0112] The intermittent rejection circuit 40 outputs a low level as the intermittent rejection mode from time t0 to t6. For example, when the intermittent culling mode is at the low level, the timing generation circuit 39 generates a signal for causing the transistors T1 and T2 to switch on and off.

[0113] At time t6, the comparator CP3 for zero crossing outputs a high level. Receiving the output of the...

Embodiment

[0120] In each of the above-described embodiments, the liquid crystal element (light control element) using PDLC or PNLC is exemplified, but the present invention is not limited to this. The liquid crystal element may have a structure in which polarizing plates and alignment films are arranged on both sides of the liquid crystal layer, and a TN (Twisted Nematic) method, a VA (Vertical Alignment) method, or an IPS (In-Plane Switching) method can be used. Moreover, as a light control element, besides a liquid crystal element, various electro-optical elements whose refractive index is changed by a voltage can be used.

[0121] In addition to MOS transistors or bipolar transistors, the switching elements T1 and T2 shown in the above-described embodiments may be SiC-MOSFETs using silicon carbide (SiC) as the semiconductor layer or gallium nitride (GaN) as the semiconductor layer. ) of GaN-MOSFET etc.

[0122] In addition to diodes, the rectifier elements D3 and D4 shown in the abo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A dimming device (10) includes: a dimming element (11) including a first laminate, a second laminate, and a liquid crystal layer, the first laminate and the second laminate each including electrodes provided on a substrate, The liquid crystal layer is sandwiched by the first laminate and the second laminate; a switching element (T1) is connected between the AC power source and the dimming element (11); a comparator (CP1) detects whether the AC power source is smaller than the first 1 voltage is high, the first voltage is higher than 0V and lower than the maximum value of the AC power supply; and a control circuit (38), which, when the AC power supply is higher than the first voltage, performs PWM control on the switching element (T1) or PFM control.

Description

technical field [0001] The present invention relates to a dimming device using liquid crystal. Background technique [0002] A dimming device using a polymer-dispersed liquid crystal or a polymer network-type liquid crystal that can perform bright display without requiring an alignment treatment or a polarizing plate is known. The liquid crystal layer (dimming layer) includes a liquid crystal material and a polymer material, and the ordinary light refractive index of the liquid crystal material and the refractive index of the polymer material are set to be approximately the same. [0003] For example, when no voltage is applied to the liquid crystal layer, the dimming device is in a scattering state, and when a voltage is applied to the liquid crystal layer, the dimming device is in a transmissive state. For example, it is preferable to use a commercial power supply (effective voltage 100V, frequency 60Hz or 50Hz) in the dimming device in consideration of use in homes or co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G02F1/13
CPCG02F1/13G02F1/133H02M5/02G09G2330/021G09G3/3696G02F1/13306H02M1/08H03K17/6871
Inventor 高桥洋
Owner TOPPAN PRINTING CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com