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Semiconductor devices and electronic devices

A semiconductor and electronic equipment technology, applied to static indicators, instruments, etc., can solve problems such as hindering power supply

Active Publication Date: 2021-04-09
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 devices and electronic devices
  • Semiconductor devices and electronic devices
  • Semiconductor devices and electronic devices

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 present invention relates to semiconductor devices and electronic devices. Even if the timings of power supply and discharge release are staggered between the semiconductor devices, generation of a through current across the semiconductor devices is prevented. A semiconductor device has a first mode in which one is used and a second mode in which multiple devices are used. When one driven device is driven using the semiconductor devices of the first mode and the second mode, the power supply lines of the respective semiconductor devices are conducted outside each semiconductor device so that errors in the operating power supply voltages of the respective semiconductor devices cancel each other out. When the power supply unit of each semiconductor device is enabled to operate in response to an instruction to release the low power consumption state, the supply start timing of the operating power supply voltage in the second mode is delayed compared with the first mode, so excessive inrush current is generated. Moreover, since the discharge release timing of the power supply line is equal between the first mode and the second mode, a through current does not flow from one power supply unit to the other power supply unit due to a deviation 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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Patent Type & Authority Patents(China)
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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