CN204288758U - Based on the MIPI liquid crystal module Vcom calibration apparatus of FPGA - Google Patents

Abstract

The utility model discloses a kind of MIPI liquid crystal module VCOM calibration apparatus based on FPGA, it comprises host computer interactive module, ARM controller and MIPI liquid crystal module to be measured, it is characterized in that: it also comprises FPGA signal element, wherein, described host computer interactive module connects ARM controller by network interface, described ARM controller connects FPGA signal element by external interface bus, and FPGA signal element connects MIPI liquid crystal module to be measured.The utility model can save MIPI bridging chip in liquid crystal module multi-channel test system, improves the OTP development efficiency of MIPI liquid crystal module, meets the various liquid crystal module demand based on MIPI agreement, improve the production efficiency of liquid crystal module.

Description

Based on the MIPI liquid crystal module Vcom calibration apparatus of FPGA

Technical field

The utility model relates to liquid crystal module technical field of measurement and test, refers to a kind of MIPI liquid crystal module Vcom calibration apparatus based on FPGA particularly.

Background technology

Vcom (Voltage of Common electrode, public electrode voltages) be the magnitude of voltage that liquid crystal module Panel holds, determined by the characteristic of liquid crystal and the principle of work of liquid crystal module, a positive and negative deflection voltage is there is in Panel (module) driving circuit, Vcom needs the bosom point being arranged on this positive and negative deflection voltage, by adjusting the value of Vcom, can the Flicker of Panel control (flicker degree) value be adjusted to minimum, thus make the display effect of Panel reach best.Only rely on eye-observation and regulate Vcom voltage to there will be deviation, for higher several frequencies as 120Hz and 240Hz, people cannot make with the naked eye to regulate Flicker value.

At present, based on MIPI (Mobile Industry Processor Interface, mobile Industry Processor Interface) liquid crystal module of agreement is more and more applied to mobile phone, panel computer, the electronics industry such as vehicle mounted guidance, the flicker degree Flicker of screen is the factor directly affecting liquid crystal module display quality, so Fliker flicker degree must be adjusted to optimum value by regulating the Vcom voltage of module in module production run, again according to OTP (the One-time Password of MIPI module, dynamic password) flow process by the programming of best Vcom value in module IC, after making it power at every turn, all the time be optimum value not changing Vcom voltage initial under Vcom register case, thus ensure that the Flicker flicker of module is minimum.And the general regulative mode of current MIPI module Flicker value is by single-chip microcomputer configuration MIPI bridging chip, then read and write according to the register of MIPI standard agreement to module by bridging chip, but there is following defect in this control method:

1, in the program, each bridging chip can only a corresponding module, and for multichannel liquid crystal module test macro, need to adopt multiple bridging chip, peripheral circuit is complicated, and system hardware cost is high.

2, the signal output speed of MIPI bridging chip and amplitude are defined by chip internal, very flexible, can not meet the requirement of all modules to signal rate and amplitude.

3, the scheme of MIPI bridging chip is adopted, because the read-write length limited of module IC register is in FIFO (the First Input First Output of bridging chip inside, First Input First Output) length, may occur that the storage space of module IC register can not meet the situation of the length requirement that reads and writes data.

Utility model content

The purpose of this utility model is exactly to provide a kind of MIPI liquid crystal module Vcom calibration apparatus based on FPGA, this device can save MIPI bridging chip in liquid crystal module multi-channel test system, improve the OTP development efficiency of MIPI liquid crystal module, meet the various liquid crystal module demand based on MIPI agreement, improve the production efficiency of liquid crystal module.

For realizing this object, the MIPI liquid crystal module Vcom calibration apparatus based on FPGA designed by the utility model, it comprises host computer interactive module, ARM (Advanced RISCMachines) controller and MIPI liquid crystal module to be measured, it is characterized in that: it also comprises FPGA (Field-Programmable Gate Array, field programmable gate array) signal element, wherein, described host computer interactive module connects ARM controller by network interface, described ARM controller connects FPGA signal element by external interface bus, FPGA signal element connects MIPI liquid crystal module to be measured.

Described FPGA signal element connects MIPI liquid crystal module to be measured by MIPI protocol interface.

Described MIPI liquid crystal module to be measured has multiple, and described MIPI protocol interface has multichannel, and described FPGA signal element connects corresponding MIPI liquid crystal module to be measured by each road MIPI protocol interface.

The beneficial effects of the utility model:

1, the utility model is by the unique advantage of the multi-pipe pin resource and Digital Signals that utilize the fpga logic control chip in FPGA signal element, its a slice fpga logic control chip just can replace the high MIPI bridging chip of eight costs, and it has irreplaceable advantage on cost.

2, the utility model exports MIPI signal owing to directly utilizing FPGA signal element, the MIPI signal exported can artificially carry out adjusting to meet its demand according to the singularity of MIPI liquid crystal module to be measured, the Vcom adjustment of all kinds of liquid crystal module can be applied to widely, in addition because the FIFO length of FPGA inside can change, can arrange to tens KB from a few KB, any length requirement read and write data can be met.

3, system architecture of the present utility model only has host computer to arrive ARM controller to arrive FPGA signaling module again, arrive to ARM control module the structure that single chip control module arrives MIPI bridging chip more again than host computer before, decrease single chip control module, while making whole Vcom adjustment flow path efficiency higher, eliminate the hardware cost of single-chip microcomputer and peripheral circuit thereof.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Wherein, 1-host computer interactive module, 2-ARM controller, 3-FPGA signal element, 4-MIPI liquid crystal module to be measured.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:

The MIPI liquid crystal module Vcom calibration apparatus based on FPGA as described in Figure 1, it comprises host computer interactive module 1, ARM controller 2, MIPI liquid crystal module 4 to be measured and FPGA signal element 3, wherein, described host computer interactive module 1 connects ARM controller 2 by network interface, described ARM controller 2 is by external interface bus (External Bus Interface, EBI) connect FPGA signal element 3, FPGA signal element 3 and connect MIPI liquid crystal module 4 to be measured.

In technique scheme, described FPGA signal element 3 connects MIPI liquid crystal module 4 to be measured by MIPI protocol interface.

In technique scheme, described MIPI liquid crystal module 4 to be measured has multiple, and described MIPI protocol interface has multichannel, and described FPGA signal element 3 connects corresponding MIPI liquid crystal module 4 to be measured by each road MIPI protocol interface.

In technique scheme, described MIPI protocol interface has eight tunnels, and described MIPI liquid crystal module 4 to be measured has eight, and MIPI protocol interface correspondence in every road connects a MIPI liquid crystal module 4 to be measured.

In technique scheme, host computer interactive module 1 is responsible for realizing the configuration of user, operation and information display function, and the numerical value of Vcom adjustment is handed down to ARM controller 2 by host computer interactive module 1 by network interface.The Vcom value that ARM controller 2 is responsible for host computer interactive module 1 to transmit is by external interface bus write FPGA signal element 3, and the often kind of LCD based on MIPI agreement (Liquid Crystal Display) liquid crystal module has the Vcom of its uniqueness to regulate flow process and method, ARM controller 2 be responsible for by the adjusting process of these LCD liquid crystal module and flow process compatible in internal software code, select different liquid crystal module adjusting process by user's configuration of host computer interactive module 1.FPGA signal element 3 is responsible for distributing output 8 road MIPI signal therein, each road MIPI signal exports to a LCD liquid crystal module by corresponding MIPI protocol interface, received the Vcom numerical value of ARM controller 2 transmission by external interface bus simultaneously, Vcom numerical value is sent to liquid crystal module according to the MIPI agreement of standard, makes the Flicker flicker degree of liquid crystal module by adjustment to optimum condition.

Utilize the Vcom value adjusting process of the above-mentioned MIPI liquid crystal module Vcom calibration apparatus based on FPGA, comprise the steps:

Step 1: MIPI liquid crystal module 4 to be measured is detected required configuration parameter and sends to ARM controller 2 by host computer interactive module 1, host computer interactive module 1 receives the some screen operation of user simultaneously, and transferred to MIPI liquid crystal module 4 power up commands to be measured and send to ARM controller 2, ARM controller 2 is receiving after above-mentioned MIPI liquid crystal module 4 to be measured detects required configuration parameter and MIPI liquid crystal module 4 power up commands to be measured, MIPI liquid crystal module 4 to be measured is detected required configuration parameter and sends to FPGA signal element 3, MIPI liquid crystal module 4 to be measured performs the operation of power up commands by FPGA signal element 3, now MIPI liquid crystal module 4 to be measured is lit, the picture of MIPI liquid crystal module 4 to be measured is switched to Flicker picture, the flicker level that the MIPI liquid crystal module 4 to be measured that operating personnel's human eye is experienced is current,

Step 2: after lighting MIPI liquid crystal module 4 to be measured, ARM controller 2 detects required configuration parameter by according to this MIPI liquid crystal module 4 to be measured prestored, by the Vcom value of now MIPI liquid crystal module 4 to be measured by FPGA signal element 3 acquisition from the D0 passage (number of delivering a letter and the full-duplex channel controlled) of MIPI liquid crystal module 4 to be measured, and the Vcom numerical value of acquisition is returned to host computer interactive module 1, current MIPI liquid crystal module 4Flicker flicker degree to be measured and Vcom numerical value now can be mapped by operating personnel;

Step 3: operating personnel change the Vcom numerical value of host computer interactive module 1 display by the Vcom adjustment interface that host computer interactive module 1 provides, the new Vcom numerical value that operating personnel input by host computer interactive module 1 passes to ARM controller 2, described new Vcom numerical value is transferred to FPGA signal element 3 by external interface bus by ARM controller 2, described new Vcom numerical value is packaged into MIPI protocol command and passes to MIPI liquid crystal module 4 to be measured by FPGA signal element 3 again, now MIPI liquid crystal module 4 to be measured have received the new Vcom numerical value of operating personnel's input, the Vcom voltage of MIPI liquid crystal module 4 inside to be measured is changed, the Flicker flicker of MIPI liquid crystal module 4 to be measured is also corresponding to change, operating personnel are by the change of the flicker level of eye-observation MIPI liquid crystal module 4 to be measured now corresponding to Vcom numerical value, the Flick flicker degree of MIPI liquid crystal module 4 to be measured is adjusted to optimum condition,

Step 4: when the Flicker flicker degree of the MIPI liquid crystal module 4 to be measured corresponding to the Vcom numerical value that operating personnel determine now adjustment has reached optimum condition, operating personnel click the programming button of host computer interactive module 1, the best Vcom value corresponding to MIPI liquid crystal module 4Flicker flicker degree optimum condition to be measured are written in MIPI liquid crystal module 4 to be measured.

Step 5: complete the burning of best Vcom numerical value in MIPI liquid crystal module 4 to be measured after, MIPI liquid crystal module 4 to be measured resets by ARM controller 2, then again the Vcom numerical value after burning is read out from the Vcom register of MIPI liquid crystal module 4 to be measured by FPGA signal element 3, the Vcom numerical value of reading is passed to host computer interactive module 1, host computer interactive module 1 now judges that whether the Vcom numerical value of retaking of a year or grade is consistent with the best Vcom value of operator's burning before, if both are consistent, then host computer interactive module 1 shows Vcom adjustment success, otherwise, display Vcom adjustment failure.

In the step 4 of technique scheme by the detailed process that the best Vcom value corresponding to MIPI liquid crystal module 4Flicker flicker degree optimum condition to be measured is written in MIPI liquid crystal module 4 to be measured be: host computer interactive module 1 receives the burned order of operating personnel, this programming order and best Vcom value are passed to ARM controller 2 by network interface, best Vcom value is written to FPGA signal element 3 by external interface bus by ARM controller 2, now in burned process, that ARM controller 2 is different from calibration procedures is the dynamic password (OTP that ARM controller 2 needs according to this MIPI liquid crystal module 4 to be measured, One-time Password, dynamic password) burned flow process, after the related register of MIPI liquid crystal module 4 to be measured is configured, again now best Vcom value is stored in the Vcom register of MIPI liquid crystal module 4 to be measured.

In technique scheme, according to the method for step 1 ~ step 5, the multiple MIPI liquid crystal module 4 be connected are carried out respectively the adjustment of Vcom value with FPGA signal element 3.

In technique scheme, in described step 1 MIPI liquid crystal module 4 to be measured detect required configuration parameter comprise parallel turn serial clock data, data channel number, field synchronization delay cycle, the row valid data cycle, the synchronous bit wide of row, the front and back shoulder data of row, the field valid data cycle, field synchronization bit wide, the front and back shoulder data of field and the IC initialization of register data of MIPI liquid crystal module 4 to be measured.

The utility model arrives to ARM control module the method that single chip control module arrives MIPI bridge sheet again than host computer before again, decrease single chip control module, while making whole Vcom adjustment flow path efficiency higher, eliminate the hardware cost of single-chip microcomputer and peripheral circuit thereof.

The content that this instructions is not described in detail belongs to the known prior art of professional and technical personnel in the field.

Claims (4)

1. the MIPI liquid crystal module Vcom calibration apparatus based on FPGA, it comprises host computer interactive module (1), ARM controller (2) and MIPI liquid crystal module to be measured (4), it is characterized in that: it also comprises FPGA signal element (3), wherein, described host computer interactive module (1) connects ARM controller (2) by network interface, described ARM controller (2) connects FPGA signal element (3) by external interface bus, and FPGA signal element (3) connects MIPI liquid crystal module (4) to be measured.

2. the MIPI liquid crystal module Vcom calibration apparatus based on FPGA according to claim 1, is characterized in that: described FPGA signal element (3) connects MIPI liquid crystal module (4) to be measured by MIPI protocol interface.

3. the MIPI liquid crystal module Vcom calibration apparatus based on FPGA according to claim 2, it is characterized in that: described MIPI liquid crystal module (4) to be measured has multiple, described MIPI protocol interface has multichannel, and described FPGA signal element (3) connects corresponding MIPI liquid crystal module (4) to be measured by each road MIPI protocol interface.

4. the MIPI liquid crystal module Vcom calibration apparatus based on FPGA according to claim 3, it is characterized in that: described MIPI protocol interface has eight tunnels, described MIPI liquid crystal module (4) to be measured has eight, and MIPI protocol interface correspondence in every road connects a MIPI liquid crystal module (4) to be measured.