Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Display device and its liquid crystal screen backlight timing control circuit

A timing control circuit and backlight control technology, which is applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve problems such as easy screen flicker and affect user experience, so as to improve user experience and reduce screen flicker The effect of the phenomenon

Active Publication Date: 2019-08-23
HISENSE VISUAL TECH CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing backlight timing control circuit 70a is prone to screen flicker, which affects user experience, and it is necessary to improve it

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
  • Display device and its liquid crystal screen backlight timing control circuit
  • Display device and its liquid crystal screen backlight timing control circuit
  • Display device and its liquid crystal screen backlight timing control circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0018] combine figure 1 and figure 2 , firstly, a more detailed analysis is carried out on the processes of the existing backlight timing control circuit 70a in the process of AC shutdown and DC shutdown.

[0019] Since the power supply (12V) of the liquid crystal screen 50 is directly received from the power module 10 through the line 105, the power module 10 is usually connected with a large electrolytic capacitor, and the discharge time is very slow, while there is no or very little electrolytic capacitor on the main board 30. Therefore, the discharge is faster. Therefore, when the AC power is cut off, the motherboard 30 is powered off earlier than the LCD screen 50, so that the motherboard 30 cannot effectively control the backlight of the LCD screen 50, resulting in screen flickering on the LCD screen 50.

[0020] For the AC shutdown process, 1. When the AC sh...

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

The invention relates to a display device and a liquid crystal screen backlight sequential control circuit thereof. The liquid crystal screen backlight sequential control circuit comprises a backlight control unit for generating a backlight control signal based on a signal from a first control port of a master chip and transmitting the signal to a liquid crystal screen through an output port, a follow current unit for providing follow currents for the backlight control unit, and a follow current control unit for controlling the follow current unit to determine whether follow currents are provided based on a signal from a second control port of the master chip. A first power source is connected with the first control port in a pull up manner; and a second power source is connected with the output port in a pull up manner. The follow current unit employs a follow current power supply for power supply; the power-down time of the follow current power supply is larger than the power-down time of the first power source; and the power-down time of the follow current power supply is larger than the power-down time of the second power source. Therefore, the splash occurrence is reduced; and the user experience is improved.

Description

technical field [0001] The invention relates to a display device, in particular to backlight control of a liquid crystal screen. Background technique [0002] see figure 1 , current display devices such as LCD TV 100a and the like usually include: a power supply module 10; a main board 30, the main board 30 includes a main chip, etc.; and the backlight timing control circuit 70a, controlled by the control port 307a of the motherboard 30, generates a backlight control signal 705a. In addition, the LCD screen 50 obtains relevant power supply from the power module 10 through the line 105 . [0003] see figure 2 , the backlight timing control circuit 70a uses a single standby controllable GPIO to provide the BL_CTL control signal, plus a complex freewheeling circuit (that is, the circuit part on the emitter side of the triode V1), because the freewheeling circuit has a capacity capacitor C1 , C2 and diodes VD1, VD2 require a larger PCB (printed circuit board) area to place ...

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): G05B19/04
Inventor 田收
Owner HISENSE VISUAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com