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LED display screen driving chip and latch signal generation method and system

A LED display and driver chip technology, applied to static indicators, instruments, etc., can solve the problem of occupying a lot of port resources, and achieve the effect of simplifying the structure and reducing the number of external ports

Active Publication Date: 2019-07-30
SHENZHEN FM ELECTRONICS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing 4-wire LED display driver chip still needs 4 port drivers, which takes up too many port resources

Method used

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  • LED display screen driving chip and latch signal generation method and system
  • LED display screen driving chip and latch signal generation method and system
  • LED display screen driving chip and latch signal generation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of LED display driver chip, see figure 2, including a controller, a row scanning drive unit, an LED array, and a column output drive unit; wherein the output of the controller is connected to the input of the row scan drive unit, and the output of the row scan drive unit is connected to the LED array;

[0048] The column output driving unit includes a shift register, a latch and a constant current output unit; the data output port (hereinafter referred to as the SDI port) and the clock port (hereinafter referred to as the CLK port) of the controller are connected to the shift register, and the shift register The output end of the bit register is connected to the input end of the latch, the output end of the latch is connected to the input end of the constant current output unit, and the output end of the constant current output unit is connected to the LED array; the use of the controller The energy port is connected to the control terminal of the constant curre...

Embodiment 2

[0057] Embodiment two adds the following content on the basis of embodiment one:

[0058] see image 3 In the figure, both the first D flip-flop and the second D flip-flop are represented by dff, the delay unit is represented by delay, the inverter is represented by inv, and the combinational logic unit is represented by comb logic.

[0059] The latch decoding unit includes a plurality of first D flip-flops, a delay unit, an inverter, a combinational logic unit, and a second D flip-flop;

[0060] All the first D flip-flops are connected in series, wherein the power supply terminal of the first D flip-flop is connected to the positive power supply, and the power supply terminal of the N+1 first D flip-flop is connected to the output terminal of the N-th first D flip-flop ; The output terminals of all the first D flip-flops are connected to the input terminals of the combinational logic unit; the data segments of all the first D flip-flops are connected to the data output port ...

Embodiment 3

[0067] A kind of latch signal generation method of LED display driver chip, see Figure 4 , including the following steps:

[0068] S1: When the rising edge of the clock port output of the controller is detected, the timer is started;

[0069] S2: When it is detected that the clock port of the controller is at a high level and the data output port outputs a pulse, the timer is incremented by 1;

[0070] S3: When the clock port of the controller is detected to output a falling edge, stop the timer timing;

[0071] S4: Read the data of the timer. When the data of the timer is greater than or equal to the preset latch threshold, a latch signal is generated and output to the latch.

[0072] specifically, Figure 5 For the existing 4-wire control mode. The SDI data is shifted into the shift register at the rising edge of the CLK signal, and then the data in the shift register is locked to the latch at the high level of the LA signal.

[0073] Figure 6 The 3-wire control mode...

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Abstract

The invention provides an LED display screen driving chip. The LED display screen driving chip comprises a controller, a row scanning driving unit, an LED array and a column output driving unit. The output end of the controller is connected with the input end of the line scanning driving unit, and the output end of the line scanning driving unit is connected with the LED array. The column output driving unit comprises a shift register, a latch, a constant current output unit and a latch decoding unit. The data output port and the clock port of the controller are further connected to the inputend of the latch decoding unit, and the output end of the latch decoding unit is connected to the control end of the latch. The chip is controlled by a three-line LED display screen instead of an existing four-line LED display screen, and a data latch port LA of a controller is omitted. A latch decoding unit is additionally arranged in the column output driving unit, LA data latch signals are restored through data output port signals and clock port signals, the structure of an existing LED display screen driving chip is simplified, and external ports are reduced.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an LED display driver chip, a method and a system for generating a latch signal. Background technique [0002] Generally speaking, the LED display system consists of a controller, a row scan driver, an LED light array and a column output driver. Such as figure 1 As shown, the controller controls the row scan drive and column output drive, the row scan drive controls the LED array to scan row by row, the column output drive controls the constant current of the LED array to turn on the lights row by row, and realizes the lighting through the PWM drive control of the column output. grayscale control. Progressive LED gray level control is driven by periodic line scanning through line scanning to display images. [0003] At present, the widely used 4-wire LED display driver chip is relatively mature, that is, the 4-wire control method is usually used between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32Y02B20/40
Inventor 李科举刘盛彬
Owner SHENZHEN FM ELECTRONICS GRP CO LTD
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