Brightness adjustment circuit

Abstract

A brightness adjustment circuit directly controls the platform processor U1 through a brightening circuit and a dimming circuit connected to the X86 computer platform processor U1; wherein the brightening button Key1 in the brightening circuit is connected with an electrostatic protection diode D1, Through the first filter circuit, it is connected to the pin GPIOx of the X86 platform processor U1 to form an external backlight dimming command adjustment circuit as a whole; wherein the dimming key Key2 in the dimming circuit is connected to the electrostatic protection diode D2, through the The second filter circuit composed of the resistor R3 and the capacitor C2 is connected to the pin GPIOy of the processor U1 of the X86 platform, and constitutes an external backlight dimming instruction regulating circuit as a whole. The adjustment circuit achieves the function of receiving user brightness adjustment instructions and outputting pulse width adjustment signals through a relatively simple external circuit combined with the X86 platform controller, avoiding communication delays in communication with third-party ICs, and overcoming the need for adjustment instructions. unresponsive issues, and saves power and cost.

Description

【Technical field】 [0001] The invention relates to an electronic computer mainboard, in particular to an all-in-one computer mainboard without an EC chip (Embedded Controller, which is an embedded controller chip). The brightness adjustment method of the built-in LVDS interface (LowVoltage Differential Signaling, which is a low-voltage differential signal technology interface) is carried out through the X86 computer motherboard PCH itself (PlatformControlling Hub, which is the platform control chip adopted by the X86 computer motherboard). 【Background technique】 [0002] All-in-one products are becoming more and more popular, not only used in homes, but also in advertising, medical and other industry applications, and these products mostly use LVDS display screens, generally ranging in size from 24 inches to 60 This requires that the computer motherboard assembled in the all-in-one product must have the function of LVDS backlight adjustment. [0003] Nowadays, the LVDS backl...

AI Technical Summary

Problems solved by technology

[0004] 1) The sensitivity of backlight adjustment is poor

Because the user's operation command to adjust the backlight needs to pass through the EC or other conversion chips first, and then send it to the LVDS controller of the X86 motherboard. When several modules are jointly debugged, sometimes there will be hysteresis. The intuitive experience of the user is that the sensitivity is poor.

[0005] 2) The power consumption of the motherboard is high

The EC chip or LVDS conversion chip ad

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