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LED brightness adjusting circuit

A technology for brightness adjustment and current adjustment, which is applied to instruments, static indicators, etc., can solve problems such as impact, and achieve the effects of good brightness uniformity and contrast, high-efficiency drive, and low power consumption

Active Publication Date: 2021-04-02
SHENZHEN SITAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is necessary to adjust the luminance of a Micro-LED chip in the Micro-LED chip array, it is necessary to adjust the driving signal corresponding to the Micro-LED chip. The operation is responsible and easy to affect the driving signals of other Micro-LED chips.

Method used

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  • LED brightness adjusting circuit
  • LED brightness adjusting circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 A schematic diagram of an LED brightness adjustment circuit provided by Embodiment 1 of the present invention. This embodiment is applicable to the brightness adjustment of Micro-LED arrays with high pixel density and large area, such as realizing a pixel density of 5000PPI and a resolution of 1920x1080 Brightness adjustment of Micro-LED matrix.

[0031] Such as figure 1 As shown, an LED brightness adjustment circuit provided by Embodiment 1 of the present invention includes: a current adjustment module 51 , a mirror module 52 , a decoder module 53 and a control module 54 . The current regulation module 51 generates regulation current and inputs the regulation current to the mirror module 52 . The mirror module 52 replicates the adjusted current multiple times, and obtains the same mirror current each time, thereby generating multiple mirror currents. A plurality of mirror currents is input to the decoder module 53, and the decoder module 53 integrates the p...

Embodiment 2

[0042] image 3 It is a schematic diagram of an LED brightness adjustment circuit provided by Embodiment 2 of the present invention, and this embodiment of the present invention is a further refinement of the foregoing embodiments. Such as image 3 As shown, the LED brightness adjustment circuit provided by Embodiment 2 of the present invention includes: a current adjustment module 51 , a mirror module 52 , a decoder module 53 and a control module 54 , and the mirror module 52 is connected to the control module 54 through the decoder module 53 .

[0043] The current regulation module 51 is used to generate the regulation current Iin. Further, the specific structure of the current regulation module 51 can refer to Figure 4 . Such as Figure 4 As shown, the current regulation module 51 includes a power supply 511 , a current adder 512 , a current subtractor 513 and a primary mirror transistor NM0 . Both the current adder 512 and the current subtractor 513 are connected to ...

Embodiment 3

[0051] Combine below Figure 3-6 The structure of the LED brightness adjustment circuit of a specific embodiment provided by the present invention is described.

[0052] In a specific embodiment, taking driving a Micro-LED array with a pixel density of 5000ppi and a resolution of 1920x1080 as an example, the LED brightness adjustment circuit includes a current adjustment module 51, a mirror module 52, a decoder module 53 and a control module 54, The mirror module 52 is connected with the control module 54 through the decoder module 53 .

[0053] The specific structure of the current regulation module 51 is as Figure 4 As shown, it includes a power supply 511, a current adder 512, a current subtractor 513 and a primary mirror transistor NM0. Both the current adder 512 and the current subtractor 513 are connected to the negative pole of the power supply 511 . The primary mirror transistor NM0 is an NMOS transistor, its gate and drain are connected to the positive pole of the...

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Abstract

The embodiment of the invention discloses an LED brightness adjustment circuit, wherein the circuit comprises a current adjustment module which is used for generating an adjustment current; a mirror image module which is used for copying the adjusting current to generate a plurality of mirror image currents; a decoder module which is used for integrating the plurality of mirror image currents to generate a brightness adjusting signal; and a control module which is used for outputting the brightness adjusting signal to the LED driving circuit according to a control signal, so that the LED driving circuit adjusts the brightness of the LED chip according to the brightness adjusting signal. According to the embodiment of the invention, the brightness adjustment of the LED chip is realized, when the brightness adjustment is carried out, only the output brightness adjustment signal needs to be changed, the driving signal of the LED chip does not need to be changed, the operation is convenient, and the brightness adjustment difficulty is reduced.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of semiconductors, and in particular to an LED brightness adjustment circuit. Background technique [0002] Micro-LED (Micro Light-Emitting Diode, Micro-LED) has self-luminous display characteristics. It is an all-solid-state light-emitting diode with long life, high brightness, low power consumption, small size, and ultra-high resolution. It can be applied to In extreme environments such as high temperature or radiation, more and more manufacturers have planned it as a new generation of display technology. [0003] Micro-LED display devices usually use a driver chip to drive the Micro-LED chip array to emit light, that is, after the driver chip is powered on, it sends a driving signal to the Micro-LED chip array to drive the Micro-LED chip to emit light as required. When it is necessary to adjust the luminance of a Micro-LED chip in the Micro-LED chip array, it is necessary to adj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G2320/0626
Inventor 刘召军吕志坚何先顺陈锐黄利将盘福波叶嘉豪
Owner SHENZHEN SITAN TECH CO LTD