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Pre-charging method of LED display screen

An LED display and pre-charging technology, applied in static indicators, instruments, etc., can solve the problems of grayscale difference across unit boards, poor high-low gray coupling display, and poor cross-board display.

Active Publication Date: 2020-02-25
四川遂宁市利普芯微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] 1. Poor high-low gray coupling display;
[0029] 2. Poor cross-board display: display grayscale differences across unit boards

Method used

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  • Pre-charging method of LED display screen
  • Pre-charging method of LED display screen
  • Pre-charging method of LED display screen

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Embodiment Construction

[0056] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0057] like Figure 7 As shown in / 8, the precharging method of the LED display screen of the present invention, the method includes the following steps of the precharging circuit in a single cycle successively, precharging 1, precharging 2, precharging 3, circuit closing and precharging 4;

[0058] The pre-charging circuit has 5 working states which are state 1, state 2, state 3, state 4 and state 5.

[0059] State 1: Precharge the column lines of the display screen, that is, the output of the constant current drive channel of the constant current driver chip, so that the corresponding column lines are charged to a fixed potential VR1, so that all the lamp beads on the corresponding column lines are in the non-luminous cut-off state, The corresponding display effect is ...

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Abstract

The invention discloses a pre-charging method of an LED display screen, which sequentially comprises the following steps of: pre-charging 1, pre-charging 2, pre-charging 3, circuit closing and pre-charging 4 of a pre-charging circuit in a single period. A pre-charging circuit is provided with five working states, namely a state 1, a state 2, a state 3, a state 4 and a state 5; wherein the state 1,the state 2, the state 4 and the state 5 pre-charge column lines of the display screen respectively, so that the corresponding column lines are charged to a fixed potential, namely VR1, VR2, VR3 andVR4, and all LED lamp beads on the corresponding column lines are in a non-luminous cut-off state; in the state 3, the pre-charging circuit is closed, and the output is in a high impedance state; thestate 4 and the state 5 are two newly added working states, the opening process of a constant current source on a column line can be simulated, and poor high-low gray coupling display and poor cross-board display are effectively improved.

Description

technical field [0001] The invention relates to the field of driving LED display screens, in particular to a precharging method for LED display screens. Background technique [0002] At present, the common LED display driver chip systems on the market drive the scanning lines separately at different times. When the next row is driven, the dark and bright phenomenon of the previous row is called "ghosting". The reason is: when the upper line is turned off, the remaining power in the circuit has nowhere to be released, and it is only released in the form of LED light, forming a ghost image. The ghost phenomenon is particularly prominent in small-pitch LED displays. In addition, the first line of the LED display is dark, high and low gray coupling, and cross-board color difference and other poor display problems. [0003] like figure 1 It is a common structure of LED display driver in the LED display unit board for common anode (the anodes of the three kinds of lamp beads o...

Claims

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Application Information

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IPC IPC(8): G09G3/32
CPCG09G3/32
Inventor 梁芳陽
Owner 四川遂宁市利普芯微电子有限公司
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