Title:
LED DISPLAY AND PULSE WIDTH MODULATION SYSTEM THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/179093
Kind Code:
A1
Abstract:
A pulse width modulation system. Considering that a phase-locked loop can reduce a pulse width of a clock signal by increasing the frequency, in the present application, by means of a control voltage outputted by a filter in the phase-locked loop, an external second voltage-controlled retarder which has the same structure as a voltage-controlled retarder in the phase-locked loop can shift a phase of an original PWM signal backwards by a preset delay duration (less than one clock signal period) to obtain a signal to be superimposed. In this way, a target PWM signal of which the pulse width is the sum of the pulse width of the original PWM signal and the preset delay duration can be generated by superposing the signal to be superposed and the original PWM signal, so that "a high-level duration within each period" of a driving current of an LED may be adjusted in smaller steps, thereby facilitating improvement of display fineness of an LED display. An LED display has the same beneficial effects as the pulse width modulation system.
Inventors:
SU WEI-CHUN (CN)
Application Number:
PCT/CN2022/137223
Publication Date:
September 28, 2023
Filing Date:
December 07, 2022
Export Citation:
Assignee:
XIAMEN XM PLUS TECH CO LTD (CN)
International Classes:
G09G3/32; H03K7/08; H05B45/325
Foreign References:
| CN114724501A | 2022-07-08 | |||
| US8525609B1 | 2013-09-03 | |||
| CN111724728A | 2020-09-29 | |||
| TW202046275A | 2020-12-16 | |||
| CN102458021A | 2012-05-16 | |||
| CN102629863A | 2012-08-08 | |||
| CN111028768A | 2020-04-17 | |||
| CN113140181A | 2021-07-20 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)
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