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Semiconductor device

A semiconductor and reference voltage technology, applied in static memory, instrument, electrical digital data processing, etc., can solve the problems of lower touch detection accuracy, disordered circuit display state, and lower display quality, and achieve the effect of suppressing adverse effects

Inactive Publication Date: 2015-04-15
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the reference voltage supplied to the circuit for driving the common electrode, the circuit for driving the source electrode, and the circuit for controlling the touch panel fluctuates, all circuits are affected and the display state is disturbed, and the touch detection accuracy is also reduced.
In particular, if we focus on the power supply noise of the reference voltage generating circuit as the fluctuation of the reference voltage, the fluctuation of the reference voltage will be caused by the operation of the circuit using the same power supply.
When such a power fluctuation occurs asynchronously with the display timing, the display disturbance is random and localized with respect to the display screen, and the display quality is remarkably degraded.

Method used

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  • Semiconductor device
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Embodiment Construction

[0059] 1. Outline of Embodiment

[0060] First, an outline of the embodiments disclosed in the present application will be described. In the summary description of the embodiments, reference numerals in the drawings referred to in parentheses are merely examples of concepts included in the components in parentheses.

[0061] 〔1〕>

[0062] A semiconductor device (1, 1A) includes: a first circuit unit (20, 30, 31, 32); a reference voltage generating circuit (21) that generates a reference voltage (Vref); a sampling and holding circuit (40) for the reference voltage a sample-and-hold control circuit (60, 70, 70A), which controls the sample-and-hold circuit; and a plurality of second circuit units (10cct, 11cct, 12cct), whose input is sampled and held by the sample-and-hold circuit The reference voltage to operate. The sample-and-hold control circuit instructs the sample-and-hold circuit to perform a sampling operation of the reference voltage when the semiconductor device oper...

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Abstract

In a semiconductor device in which a reference voltage is generated by a reference voltage generation circuit, and the same reference voltage generated is used in a plurality of circuit units for the purpose of generating a voltage, a sampling and holding circuit of the reference voltage is provided in order to provide a standard voltage to the circuit units. A sampling and holding control circuit that controls the sampling and holding circuit instructs the sampling and holding circuit to perform a sampling operation of the reference voltage in case that the semiconductor device operates in a state where power supply noise of the reference voltage generation circuit falls within a predetermined range, and instructs the sampling and holding circuit to perform a holding operation of the reference voltage in case that the semiconductor device operates in a state where the power supply noise exceeds the predetermined range.

Description

technical field [0001] The present invention relates to techniques for alleviating the influence of reference voltage fluctuations caused by power supply noise, and relates to a semiconductor device used for distributing a reference voltage from, for example, a single reference voltage generation circuit to a plurality of circuits with different power supplies. More specifically, It relates to a technology effectively applied to an LCD (Liquid Crystal Display: Liquid Crystal Display) controller LSI (Large Scale Integrated circuit: Large Scale Integrated Circuit) etc. for driving a liquid crystal display panel. Background technique [0002] In the case of having a plurality of circuits for generating a signal of a desired voltage using a reference voltage, if the reference voltage generation circuit is shared among the plurality of circuits, not only the number of reference voltage generation circuits but also the trimming circuit (trimming circuit) can be reduced. circuit) c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG11C5/147H03M1/1245G09G2310/0294G09G2310/0289G05F3/16G09G3/36G06F3/0416G06F3/04182G06F3/04184G06F3/044G09G3/3696
Inventor 远藤一哉
Owner SYNAPTICS JAPAN GK