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Current correction method and control circuit thereof

A current correction and current control technology, applied in static indicators, instruments, etc., can solve the problems of large circuit board area and high cost

Active Publication Date: 2014-04-16
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using this method, external precision resistors must be purchased separately, and the position of the external precision resistors must be placed on the circuit board, resulting in problems of large circuit board area and high cost.

Method used

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  • Current correction method and control circuit thereof
  • Current correction method and control circuit thereof
  • Current correction method and control circuit thereof

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Embodiment Construction

[0040] For example, according to the specifications of the LVDS specification, the panel resistance (R panel ) must be very accurate as 100 ohms, and its allowable variation range is ±1% to ±5%. Therefore, the present invention hopes to utilize this panel resistance (R panel ) to correct the current in the display control circuit 300, so that the display control circuit 300 can generate an accurate current. In this way, it is not necessary to configure a precise resistor on the circuit board to connect to the display control circuit 300 , so the cost of chip pins and precise resistors can be saved.

[0041] Please refer to figure 2 , which is a schematic diagram of the signal connection between the display control circuit 300 and the liquid crystal panel 450 according to a preferred embodiment of the present invention. The display control circuit 300 can be an IC fixed on a circuit board (not shown), and the display control circuit 300 includes a digital area 350 and an an...

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Abstract

The invention discloses a current correction method and a control circuit thereof. The control circuit capable of correcting current is provided with a panel resistor, a differential pair output end of which is connected to a panel. The current correction method comprises the following steps of: providing a preset voltage for the differential pair output end so as to obtain an accurate current flowing through the panel resistor in a correction procedure; and providing a driving current to the differential pair output end according to the accurate current in a normal operation procedure.

Description

technical field [0001] The present invention relates to a display control circuit, and in particular to a current correction method of the display control circuit and its control circuit. Background technique [0002] In order to achieve low voltage, low noise, and low electromagnetic interference (EMI), current LCD panels use differential signals for data transmission. The interface of this differential signal includes: low voltage differential signaling (hereinafter referred to as LVDS) interface, mini-low voltage differential signaling (hereinafter referred to as mini-LVDS) interface or low swing Differential signaling (reduced swing differential signaling, hereinafter referred to as RSDS) interface. [0003] Please refer to figure 1 , which is a schematic diagram of the signal connection between the existing display control circuit and the liquid crystal panel. The display control circuit 10 can be an integrated circuit (IC) fixed on a circuit board (not shown), and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/20
Inventor 张志田周儒明
Owner MEDIATEK INC
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