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Semiconductor device and electronic apparatus

A technology for semiconductors and electronic equipment, used in instruments, static indicators, etc., to solve problems such as hindering power supply

Active Publication Date: 2016-10-19
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the power supply lines of the driving power supply voltages of the respective display drivers are externally conducted via the connection lines, a through current flows from the above-mentioned part of the display drivers to the discharge switches of the other display drivers, resulting in interruption of power supply.

Method used

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  • Semiconductor device and electronic apparatus
  • Semiconductor device and electronic apparatus
  • Semiconductor device and electronic apparatus

Examples

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Embodiment Construction

[0084] exist figure 1 A display driver as a first example of the semiconductor device of the present invention is exemplified in the figure. The display driver 1 shown in this figure is not particularly limited, but may be formed on one semiconductor substrate such as single crystal silicon by CMOS integrated circuit manufacturing technology together with other appropriate circuit blocks as necessary.

[0085] exist figure 1The display driver 1 is controlled by the host device 2 and is supplied with display data and control data from the host device 2 . A display panel 3 is shown as a driven device to be displayed and driven by the display driver 1 . Although one display driver 1 is representatively shown here, figure 1 An example of an electronic device is an example in which a plurality of display drivers 1 are used to drive a display panel 3 for display. Although not particularly limited, an external logic power supply voltage ExVcc and an external analog power supply v...

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Abstract

The invention relates to a semiconductor device and an electronic apparatus. A through-current is prevented from being generated between semiconductor devices even in the case that timings of power supply and discharge release are shifted between the semiconductor devices. The semiconductor device has a first mode in which the semiconductor device is used alone and a second mode in which the semiconductor device is used in combination with another semiconductor device. In case that one driven device is driven using the semiconductor device in the first mode and the second mode, power supply lines are caused to allow electrical conduction to each other outside of each semiconductor device in order to cancel errors of operation power supply voltages of each semiconductor device. In case that a power supply unit of each semiconductor device is operable by receiving an instruction for release of a low power consumption state, a supply start timing of the operation power supply voltages in the second mode is delayed as compared to that in the first mode. Therefore an excessive in-rush current is prevented, and the timings of discharge release of the power supply lines become equal to each other between the semiconductor devices in the first mode and the second mode, there is no concern of the through-current flowing from one power supply unit to the other power supply unit due to a shift in the discharge release timing.

Description

technical field [0001] The present invention relates to a semiconductor device capable of driving a driven device with one or more semiconductor devices, and further relates to an electronic device that uses a plurality of semiconductor devices to drive a driven device, for example, to a display driver for display driving of a panel. , Effective technology. Background technique [0002] A display driver that drives a display panel generates grayscale voltages and gate drive voltages using a plurality of power supplies having a voltage higher than that of an operating power supply of a logic unit. A DCDC converter and a charge pump circuit are used in a power supply circuit that generates such driving operating power from an external power supply. Nowadays, due to the increase in size and high definition of display panels, there are cases where a plurality of display drivers are used for driving the display panels. In this case, the display area is divided so that different...

Claims

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Application Information

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IPC IPC(8): G09G3/20
CPCG09G3/20G09G2330/02G09G3/3696
Inventor 石井则行四方淳史
Owner SYNAPTICS JAPAN GK
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