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ELVDD optimization structure for AMOLED

A technology of output terminals and resistors, applied in the field of power supply, can solve the problems of wasting area, occupying space, increasing costs, etc., and achieve the effect of solving the flickering screen and optimizing the range

Active Publication Date: 2021-06-15
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce this Ripple, many applications just increase the output capacitor Cout, which not only increases the cost, but also wastes the area and takes up space.

Method used

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  • ELVDD optimization structure for AMOLED
  • ELVDD optimization structure for AMOLED
  • ELVDD optimization structure for AMOLED

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The structure of the present invention is as Figure 7 As shown, in the traditional structure, the Region1 and Region2 parts are added, and the function of Region1 is to synchronize with CLK when switching into and out of DownMode. The function of Region2 is to quickly adjust the PWM pulse width when switching in and out of DownMode, thereby reducing the Ripple of the output voltage Vout.

[0025] Principle of the present invention is:

[0026] Added into the DownMode synchronous CLK circuit, such as Figure 7 Shown in Region1; this can prevent the inductor current from dropping sharply when switching to DownMode, which can equivalently reduce the sharp drop of output voltage. Compared with image 3 and Figure 4 The DownMode Start point can be known.

[0027] Add DownMode fast PWM control method, such as Figure 7 As shown, the current IDetect in Region...

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Abstract

The invention belongs to the technical field of power supplies, and particularly relates to an ELVDD optimization structure for an AMOLED. On the basis of a traditional structure, a DownMode entering synchronous CLK circuit is added, and a DownMode rapid PWM control structure is added. The ripple Ripple generated when the DC-DC is switched from a BOOST mode to a DownMode mode is reduced, the amplitude that the current deviates from the load current is obviously optimized, namely, the Ripple of the output voltage Vout (ELVDD) is optimized, and therefore the problem that a splash screen possibly occurs to a mobile phone is well solved.

Description

technical field [0001] The invention belongs to the technical field of power supply, and in particular relates to an ELVDD optimization structure for AMOLED. Background technique [0002] At present, basically all wired charging mobile phones on the market use such as figure 1 The scheme shown is powered. That is, the mobile phone charger Adapter is connected to 220V household electricity to supply power to the mobile phone. The Charger chip in the mobile phone converts it into the voltage VSYS required by the system and charges the battery of the mobile phone. VSYS is then used to supply the speaker and the mobile phone display. , MCU and other equipment power supply. When the mobile phone opens more applications, VSYS may change repeatedly from 4.15~4.6V, or even change even more, which will cause the power supply voltage ELVDD and ELVSS of the LED Display of the mobile phone to jitter, and the phenomenon of the so-called flickering will appear. It is very unfriendly to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/14H02M1/088
CPCH02M1/088H02M1/14H02M3/1582
Inventor 曹灿华
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD