CN201876863U - E-reader - Google Patents

Abstract

The utility model discloses an e-reader, belonging to the electronic reading field. The handheld electronic equipment comprises a microprocessor, an e-paper screen, an e-paper screen control module and a power supply management module, wherein the microprocessor comprises a storage for storing the VCOM voltage value of the e-paper screen; the e-paper screen control module is used for controlling the display of the e-paper screen on the basis of a signal of the microprocessor; the power supply management module is used for receiving the data from the e-paper screen control module and outputting the voltage required by the e-paper screen; the microprocessor reads the VCOM voltage value from the storage storing the VCOM voltage value of the e-paper screen when the e-reader starts, and the power supply management module is controlled by the e-paper screen control module to output the voltage corresponding to the VCOM voltage value to the e-paper screen. The e-reader can provide the accurate VCOM voltage value for the e-paper screen and has a good display effect.

Description

A kind of electronic reader

Technical field

The utility model discloses a kind of electronic reader, belongs to the electronic reading field.

Background technology

" EINK " is the abbreviation of English Electronic Ink.Translate into Chinese and be " electric ink "." EINK " has many advantages, comprises legibility, flexibility, easily cheap the manufacturing and low-power consumption.Compare with other display technique, the reflectivity and the contrast of electric ink are preferable.Seeming the China ink on their sensitive papers, is the media that people feel well when reading and handling.Under light comprised direct sunlight, other display material easily made reader's content of feeling show that some is light and is difficult to read.Yet possess the display effect of traditional paper based on the demonstration of electric ink, can not influence the reading experience of reader under light and be equipped with at wide paper device.Electric ink is widely used because of its flexibility characteristics.Can use on the paper, the flexible writing materials of generation have the display effect the same with newspaper.It also can print on the cloth, perhaps prints on similar mobile phone and the nonplanar grotesque surface of other electrical equipment.EINK relies on its flexible display property to be widely used in electric paper book, mobile phone, PDA, commerce, as fields such as demonstration such as shop, pharmacy, sales fields, has a extensive future, and market is huge.

In the electronic reader exploitation of using the EINK screen, it is extremely important to satisfy required each voltage of EINK screen, VPOS for example, VNEG, VEE, voltages such as VCOM.Wherein the VCOM voltage ratio is more special, because the characteristic of EINK, every EINK screen is also referred to as the Electronic Paper screen, the VCOM(common electric voltage of requirement) all inequality, usually-1.0V ~-2.5V between.Generally can mark out required various magnitudes of voltage on the EINK screen.This just requires electric paper book to provide the specific VCOM magnitude of voltage that satisfies its needs for each piece screen.Existing electric paper book method commonly used is to adopt the electric resistance partial pressure principle, as shown in Figure 1, satisfies the different VCOM value of each Electronic Paper screen by the manual shift adjustable resistor when plant produced.The shortcoming of doing like this is apparent: need the manual shift adjustable resistor to realize voltage-regulation, time-consuming, efficient is low, thereby the precision of VCOM value can't guarantee to influence the display effect of EINK screen.

Therefore, need a kind of electronic reader that accurate VCOM value can be provided according to the characteristic of EINK screen.

The utility model content

For overcoming above-mentioned shortcoming of the prior art, the utility model provides a kind of electronic reader.Be arranged in the electronic reader by the VCOM magnitude of voltage with used Electronic Paper screen, power management chip shields according to this value of setting output accurate VCOM voltage to Electronic Paper, thereby reaches the purpose of accurate control Electronic Paper screen VCOM voltage.

The utility model provides a kind of electric paper book, comprising: microprocessor comprises the storer of the VCOM magnitude of voltage of store electrons paper screen; The Electronic Paper screen; The Electronic Paper screen control module that the Electronic Paper screen is shown control according to the signal of described microprocessor; And receive the data of shielding control module from Electronic Paper, and the power management module of each voltage of Electronic Paper screen is supplied with in output; Wherein, microprocessor read this VCOM magnitude of voltage when described electronic reader started from the storer of the VCOM magnitude of voltage of preserving described Electronic Paper screen, and controlled this power management module output voltage corresponding with the VCOM magnitude of voltage to this Electronic Paper by this Electronic Paper screen control module and shield.

Preferably, described Electronic Paper screen control chip comprises EPSON 13522 IC.

Preferably, described power management chip is TI TPS65181 PMIC.

Preferably, described storer is FLASH.

The beneficial effects of the utility model:

1) control time shortens greatly, has improved efficient, is convenient to a large amount of productions;

2) improved control accuracy, error is positive and negative 0.8%.

3) reduce components and parts, reduced the cost of electronic reader.

Description of drawings

Fig. 1 illustrates the structural representation of Electronic Paper screen VCOM voltage adjustable resistance control circuit in the prior art;

Fig. 2 illustrates the circuit system structural drawing according to the control Electronic Paper screen VCOM voltage of the utility model embodiment;

Fig. 3 illustrates the circuit system synoptic diagram according to the control Electronic Paper screen VCOM voltage of the utility model embodiment;

Fig. 4 illustrates the control Electronic Paper screen VCOM voltage method process flow diagram of the utility model embodiment.

Embodiment

Fig. 2 illustrates the circuit system structural drawing according to the control Electronic Paper screen VCOM voltage of the utility model embodiment, and Fig. 3 illustrates the circuit system synoptic diagram according to the control Electronic Paper screen VCOM voltage of the utility model embodiment.As shown in Figures 2 and 3, mainly comprise according to electric paper book of the present utility model: microprocessor MCU; Electronic Paper screen control module comprises chip EPSON13522 IC; Power management module, comprise TI TPS65181 PMIC, shield E-ink etc. with Electronic Paper, wherein, microprocessor reads the VCOM magnitude of voltage from the storer of the VCOM magnitude of voltage of preserving described Electronic Paper screen, shield with Electronic Paper by the Electronic Paper screen control module that is connected with control power management module output VCOM magnitude of voltage to be connected.In according to electric paper book of the present utility model, select for use TI TPS65181 PMIC to guarantee to control by the structure configuration of electric paper book the VCOM magnitude of voltage of Electronic Paper screen.

The function of above-mentioned each hardware components of electricity paper book is as follows:

Microprocessor (MCU): microprocessor guarantees the work of electric paper book system as master controller and realizes control to EPSON13522 IC.

Electronic Paper screen control chip EPSON13522 IC: as E Ink EPDs (Electronic Paper Displays) controller, being used to receive from the signal of microprocessor and by I2C provides control signal to arrive power management chip, shows the control solution for the Electronic Paper screen that uses the E-INK technology provides the Electronic Paper of high-performance, low-power consumption.

Power management chip TI tps65181 PMIC---is the power management scheme that E Ink Electronic Paper Displays provides, and can support maximum 9 inches displays.This power management chip provides EINK to show the power management that needs, temperature detection.In order to realize the automatic adjusting of the screen of Electronic Paper on production line VCOM magnitude of voltage, power management chip can control the VCOM magnitude of voltage that outputs to the Electronic Paper screen at-0.3V in-2.5V scope.

Microprocessor carries out read-write operation by Intel 80 interfaces/serial ports to EPSON13522 IC, realizes control.EPSON13522 IC provides EINK to show needed signal and microprocessor is passed the video data of coming and is sent to EINK, provides TPS65181 work desired signal to reach simultaneously and communicates with by I2C.TPS65181 PMIC provides EINK the required power supply of working; EINK refreshes according to the control demonstration of EPSON13522 IC.

According to electric paper book of the present utility model, the VCOM magnitude of voltage that will be applied to the Electronic Paper screen of electric paper book by for example Software tool when plant produced writes the storer of this electricity paper book, for example among the FLASH, to prevent loss of data after the power down.The VCOM magnitude of voltage of this storage is protected preventing and is changed.Electricity paper book microprocessor when starting reads the Electronic Paper screen VCOM magnitude of voltage of storing among the FLASH, before initialization Electronic Paper screen, will comprise that by INTEL 80 or serial ports the data of this VCOM magnitude of voltage send Electronic Paper screen control chip to.Because microprocessor can't directly be communicated by letter with TPS65181 PMIC, microprocessor sends to power management chip TPS65181 PMIC with data via Electronic Paper screen control chip.Electronic Paper screen control chip sends to power management chip TPS65181 PMIC with data by the I2C interface.MCU comes the sequential of Simulation with I 2C interface to communicate by letter with power management chip TPS65181 PMIC to the Electronic Paper screen by control power management chip operation registers, thereby realizes its control power management chip TPS65181 PMIC according to using 8 DAC D-A converters and register to realize the control of Electronic Paper screen VCOM magnitude of voltage from the data of Electronic Paper screen control chip.At first, the VCOM_ADJ (bit7) of the register 0x03 of TI TPS65181 PMIC being put 1 enables Epson 13522 controllers and can come control register to regulate the VCOM magnitude of voltage by I2C.Then, the register 0x04 VCOM magnitude of voltage that is set to require.TI TPS65181 PMIC is 11mV to the adjusting step-length of VCOM magnitude of voltage, and the scope of exportable VCOM magnitude of voltage is-and 0.3V is to-2.5V.TI TPS65181 PMIC is provided with the VCOM magnitude of voltage and exports this voltage to the Electronic Paper screen according to the data from Electronic Paper screen control chip, thereby guarantees the optimal display result of Electronic Paper screen.

Fig. 4 illustrates the control Electronic Paper screen VCOM voltage method process flow diagram of the utility model embodiment, specifically describes the control Electronic Paper screen VCOM voltage method of the utility model embodiment below in conjunction with Fig. 4.

Electricity paper book is after start or resetting, and microprocessor loads the driver of EPSON 13522 controllers, carries out the initial work of EPSON 13522 controllers, S401.The Electronic Paper screen VCOM magnitude of voltage of microprocessor reading and saving in electric paper book FLASH, S402 judges it whether between zone of reasonableness simultaneously, for example-1.0V is to-0.25V, S403.If the effective value in this zone of reasonableness is then preserved this value, S404, otherwise use default voltage value, S405; Whether the VCOM_ADJ (bit7) that judges TPS65181 PMIC register 0x03 is 1, S406, if be not 1 then it is set to 1, S407 makes the magnitude of voltage that is provided with in step S402 become effectively thus and this VCOM magnitude of voltage is outputed to TPS65181 PMIC by EPSON 13522.The VCOM magnitude of voltage that the Electronic Paper that obtains is shielded is set to TPS65181 PMIC register 0x04, S408.TPS65181 PMIC will export the magnitude of voltage of setting, S409 like this; Electronic Paper screen just can operate as normal after setting was finished, and carried out image, the literal demonstration.

Below in conjunction with the embodiments the utility model is had been described in detail.Should be appreciated that the embodiments described herein is illustrative and not restrictive.Those skilled in the art can have a better understanding to the technical solution of the utility model, and can carry out various modifications and variations to embodiment of the present utility model under spirit of the present utility model and aim by reading instructions.Protection domain of the present utility model is only limited by the claims of enclosing.

Claims (4)

1. an electronic reader is characterized in that, comprising:

Microprocessor comprises the storer of the VCOM magnitude of voltage of store electrons paper screen;

The Electronic Paper screen;

The Electronic Paper screen control module that the Electronic Paper screen is shown control according to the signal of described microprocessor; And

Reception is from the data of Electronic Paper screen control module, and the power management module of each voltage of Electronic Paper screen is supplied with in output;

Wherein, microprocessor read this VCOM magnitude of voltage when described electronic reader started from the storer of the VCOM magnitude of voltage of preserving described Electronic Paper screen, and controlled this power management module output voltage corresponding with the VCOM magnitude of voltage to this Electronic Paper by this Electronic Paper screen control module and shield.

2. electronic reader according to claim 1 is characterized in that, described Electronic Paper screen control chip adopts EPSON 13522 IC.

3. electronic reader according to claim 1 is characterized in that, described power management chip adopts TI TPS65181 PMIC.

4. electronic reader according to claim 1 is characterized in that, described storer adopts the FLASH storer.

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