Excitation control method for electro-excitation long-afterglow light-emitting system

Abstract

The invention discloses an excitation control method for an electro-excitation long-afterglow light-emitting system. A drive control circuit (2) controls an electroluminescence light source (3) to be turned on and emit light in a certain period T and at a duty ratio T0N / T, and excites a long-afterglow light-emitting material (4). There is N discontinuous power-on excitation time segments TON1, TON2,...,TON N in one period, wherein N is greater than or equal to two, and TON is the sum of the TON1, TON2,...,TON N. The method achieves the adjustment of the power-on light intensity of the electroluminescence light source (3) through the changing of a drive current, and enables the light intensity to be within the higher-excitation-power section of the long-afterglow light-emitting material (4). A PWM circuit is used for controlling a mode adjustment period or the duty ratio, thereby controlling the power consumption of the electroluminescence light source (3). The method can reduce the power consumption under the condition that the lowest brightness is not changed, or increase the excitation power of the long-afterglow light-emitting material (4) under the condition that the power consumption is not increased, thereby improving the brightness. Moreover, the method can achieve the design according to the needs, so as to meet various types of needs.

Description

technical field [0001] The invention relates to the application field of light emitting devices, in particular to an excitation control method of an electro-excitation long afterglow light emitting system with energy-saving light emitting function. [0002] technical background [0003] The electro-excited long afterglow luminescence system is a new type of luminescence system developed in recent years. The structural principle diagram of this electro-excited long afterglow luminescence system is shown in figure 1 As shown, it generally includes a power supply (1), a drive control circuit (2), an electroluminescence source (3) and a long-lasting luminescent material (4), a power supply (1), a drive control circuit (2), an electroluminescence source ( 3) Connected by lines, its working principle is to drive the control circuit (2) to control the power supply (1) according to a certain period T and duty cycle T ON / T supplies power to the electroluminescent source (3), so tha...

AI Technical Summary

Problems solved by technology

[0006] 1. Single luminous effect

Existing excitation control methods generally only have one continuous power-on excitation period T in a cycle T ON , so the excitation control method is single; the function of the drive control circuit (2) is too simple to meet the special effect requirements of different application fields, so its application field has great limitations

[0007] For example, using the existing excitation control method, at the moment of power-on, due to the sudden increase of the current, the luminous intensity of the electroluminescent source (3) will suddenly increase and the luminous intensity of the entire electro-excitation long-afterglow luminescent system will suddenly increase. , resulting in a serious glare effect, great irritation and damage to the human eye, and poor luminous effect, so there are limitations in use in some occasions

[0008] For example, when the electro-excitation long-lasting light-emitting system needs to set a flashing reminder between the excitation intervals, the existing excitation control method has certain design difficulties in circuit control and will increase manufacturing costs.

[0009] 2. Under some specific conditions, the excitation efficiency of the electroluminescence system is low

Sometimes there is a waste of power consumption or the phenomenon that the minimum brightness value of the lighting system is low

[0010] For example, when the current amplitude is too low, the luminous intensity of the electroluminescent source (3) is not enough when it is energized, so that the excitation efficiency of the long-lasting luminescent material (4) is too low, and the current electroluminescent long-lasting luminescent system Generally used as an energy-saving light-emitting device, the power is low, and the cumulative time T of power-on excitation in a cycle T is adopted. on The method of continuous excitation above will lead to the current amplitude is too low, so the excitation efficiency of the long afterglow luminescent material (4) is too low, and the brightness of the electro-excitation long afterglow luminescent system is insufficient, which greatly limits its application range

[0011] For example, when the current amplitude is too high, the luminous intensity of the electroluminescent source (3) will be too high when it is energized, and the light intensity of the long-lasting luminescent material (4) will be excited, causing energy waste.

[0012] 3. In the actual circuit design and manufacturing process, in order to achieve a better energy-saving goal of the electro-excited long-lasting light-emitting system and maintain a higher luminous brightness effect, how to balance energy saving and maintain high brightness, parameter control More difficult to implement, so the end result is often less than optimal design goals

[0013] So far, there are almost no literature or patent descriptions on this research. How to better solve the problems existing in the existing electro-excited long-lasting light-emitting system and meet the new needs that are constantly raised has become an urgent need for the industry.

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