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Switch structure and method for controlling charge and discharge of display screen scanning lines

A switching structure, scanning line technology, applied in static indicators, instruments, etc., can solve the problems of short turn-on time and dim light of D12

Active Publication Date: 2018-03-06
MY SEMI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the cathodes of D12 and D22 are connected together and pulled to a low potential, when the scan changes from S1 to S2, the voltage difference between the anode high potential (VS1) and the cathode low potential of D12 is greater than the forward voltage difference (Vf) of LED D12 , so D12u will also conduct, but the VS1 voltage will also discharge quickly due to the discharge path of D12, so the conduction time of D12 is very short, resulting in a slightly bright visual effect

Method used

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  • Switch structure and method for controlling charge and discharge of display screen scanning lines
  • Switch structure and method for controlling charge and discharge of display screen scanning lines
  • Switch structure and method for controlling charge and discharge of display screen scanning lines

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Embodiment Construction

[0089] The switch structure and method for controlling the charging and discharging of the scan line of the display screen of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0090] Such as Figure 3A The ghost phenomenon is solved by adding a switch structure DSW(N)409 connected to the ground, except for the original SW(N)421 (hereinafter referred to as USW(N)407) connected to the positive voltage power supply Vsupply+419 as Figure 3B Shown. Please note that USW(N)407 corresponds to the upper switch to charge the scan line (N) to the same voltage value as the positive voltage power supply, while DSW(N)409 corresponds to the lower switch to discharge the scan line (N) to the ground voltage. So that the voltage difference across the LED is lower than the forward voltage (Vf) of the LED. Similarly, USW(N+1) and DSW(N+1) correspond to the next scan line (N+1) of scan line (N), while USW(N-1) and DSW(N-1) ...

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Abstract

The present invention relates to a switch structure and method for controlling charge and discharge of LED display screen scan lines, wherein each scan line includes a USW (N) for scan line charging and a DSW (N) for scan line discharge, and the method includes: Turn on the USW (N) for a first time interval to charge the scan line; after the first time interval, turn on the DSW (N) for a second predetermined time interval to discharge the scan line; and after the second predetermined time interval , close DSW(N).

Description

Technical field [0001] The present invention relates to the switch control of the LED scanning display, and more about eliminating ghost images and caterpillar phenomena caused by the scanning switch on the LED scanning display. Background technique [0002] figure 1 Describe a drive circuit used in a traditional LED scanning display screen. A switch SW (N) in the circuit controls a corresponding scan line (N), and one end of the switch SW (N) is connected to the LED anode on the scan line (N) , The other end is connected to the positive voltage power supply Vsupply+. The SW(N) switch is controlled by the control signal S, wherein when the control signal S is activated (active), the switch SW(N) will be turned on; otherwise, the switch SW(N) will be turned off. [0003] Such as figure 1 As shown, when the switch SW (1) is turned on, the voltage of the multiple LED anodes in the scan line (1) will be charged to VS1; when the switch SW (2) is turned on, the multiple LED anodes in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G2300/06G09G2310/0275G09G2320/0209
Inventor 邱瀚辉黄国伦
Owner MY SEMI