TWI272565B - Low power consumption LCD display - Google Patents

Abstract

The present invention relates to a low power consumption liquid crystal display (LCD) device, which comprises: a voltage divider, used to divide a source voltage into a plurality of smaller voltages; a voltage regulator, for stabilizing a driving voltage of the LCD device while outputting the stabilized driving voltage to the voltage divider; an interface, capable of receiving using signals of pulse width modulation (PWM) to be used as basis for adjusting output power; a LCD driver, capable of receiving signals issued by the voltage divider to be used as basis for controlling voltage outputs of a plurality of concurrents and nodes so as to direct the ON/OFF of pixels of the LCD device; a timing control circuit, for controlling the timings of the plural concurrents and nodes while being used as a timer for timing a pulse width modulation (PWM) control circuit; the PWM control circuit, capable of controlling the activation power of divider resistances and voltage followers through the plural concurrents and nodes while being shut down as soon as voltage is stabilized.

Description

L272565 t pulse width adjustment control power 踗Γ p ^

Cir.10 PWMr. ·η ( SeWldthM-n

Circuit,PWM Circuit) 42 ancient ten emperor 41 pairs of pulse width adjustment control circuit 42乂J 1 number input boundary substitute rPWM r ten] P · road 42 pulse wave temperature adjustment control record (PWM Control Registe) Mechanism to power (PWMDuty) output. (4) At the end of the decision, please refer to Figure VIII, A, B, and C for the adjustment. _ Prime capacitor is small, medium, and large load II = Ming use liquid crystal display, degree week work Yang - 』 In the case where a plurality of pixel capacitors of a plurality of displays are charged for charging, "the larger the capacitance value of the capacitors of a 叩 叩 贝 液 , , , 越大 越大 越大 ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ The longer the charging time of the forked bag is, the more I and ^ are needed to provide the halogen capacitor in the turbulent state, and the large discharge current, the discharge action of the book Sulei can achieve long-term stability. Pressure state. , by using the interface to set a pulse width adjustment control registration mechanism of a bit to select an optimal pulse width adjustment output to maintain the optimal liquid crystal display quality and achieve the best province Electric effect. ^ Please refer to FIG. 5, which is the intention of the pulse width adjustment control of the present invention, wherein the pulse wave twist adjustment is controlled to the positive half cycle, and the voltage dividing circuit can be enabled ( Enable), in other words, charging the circuit. After the common point and the node voltage are stable (representing the transition state to the negative half cycle), the voltage dividing circuit uses the halogen capacitor and the voltage dividing capacitor to maintain the voltage. No action is required, and it means that the voltage divider circuit does not consume current, so it can effectively consume low current. Please refer to FIG. 7 , which is a schematic diagram of the liquid crystal capacitor load corresponding to the common point and the node transition state signal. The designer can use the table lookup method according to the load specifications provided by the liquid crystal display and the driving capability of the integrated circuit (IC). Determined the best pulse wave degree adjustment power peak difference ^ Gate positive power Feng this good pulse wave degree adjustment power is the minimum current value that can drive the complex voltage divider circuit, eighty - several The pulse width adjustment control number of the element (bit): When the positive half cycle is reached, the branch circuit can be enabled (: voltage divider (4) voltage divider capacitor, common point and section line charge sub-character == fixed (representative Transition to negative half cycle), the voltage is divided by the voltage divider capacitor: ί=:, at this time - by the above-mentioned Figure 3 to Figure 8c, the load node can be used, according to the supply, ΐ LCD The multiple electric warfare of the display is ',,, occupying, for example, for a stable drive r pulse wave adjustment (Pulse coffee hM_latl: two after the total number of points, the node to control the point о resistance and electricity о The power of the device 'When the voltage is stable, the pulse wave is turned off. The capacitor is regulated by the capacitive load. Send = road 乂 乂 戟; do 5 and phase, can achieve a good display and P cattle low drive current to achieve the thunder of the mine * ' ' into the field t, two;:::: fruit === The process of the device* seeks the protection of the patent right. Therefore, the application for the patent case is progressive, and the purpose and efficacy of the case are well implemented. See the application: industry value, and it is currently unpatented on the market. In the spirit of the present invention, the present invention is fully in accordance with the invention, and is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the scope of the patent application of the present invention. The equal changes and modifications should still fall within the scope of the patent of the present invention. I would like to ask your review committee to give a clear explanation and pray for it. It is the prayer. [Simplified illustration] Figure 1 is a conventional LCD display. The voltage divider circuit diagram of the voltage dividing resistor is used. Figure 2 is a voltage-stabilizing circuit diagram attached to one end of the voltage-dividing resistor in Figure 1. Figure 3 is a functional block diagram of the power-saving liquid crystal display device of the present invention. Figure 4 is the main issue Fig. 5 is a schematic diagram of a transition signal of the pulse width adjustment control of the present invention. Fig. 6 is a detailed circuit diagram of the power saving type liquid crystal display device of the present invention. The invention relates to a schematic diagram of a liquid crystal capacitive load corresponding to a common point and a node transition state signal. FIG. 8A is a schematic diagram of a pulse width adjustment power signal enabled by a voltage dividing circuit when a liquid crystal display halogen capacitor is used as a small load. It is a schematic diagram of the pulse width adjustment power signal which is enabled by the voltage dividing circuit when the liquid crystal display pixel capacitor is a medium load according to the present invention. FIG. 8C is a partial voltage when the liquid crystal display halogen capacitor is used as a large load. Schematic diagram of the pulse width adjustment power signal enabled by the circuit. [Main component symbol description] 1272565 1~ Voltage divider resistor 2~ Voltage regulator circuit 3~ Voltage follower 31~ Operational amplifier 32~ Voltage divider capacitor 41~ Parameter input interface 42 to pulse width adjustment control circuit 43 to counting control circuit 44 to voltage stabilization circuit 45 to voltage dividing circuit 451 to voltage dividing resistor 452 to voltage follower 4521~ Dividing capacitor operational amplifier 4522~ 46~ liquid crystal display driver 461~ common node point 462~

Claims (1)

1272565 ------- (Case No. 095丨06479 Patent Description Amendment) j month p) Daily repair ten, patent application scope: one ~ ~ one - ^ two 1 · A power-saving liquid crystal display device The system includes: - a voltage dividing circuit, which divides a voltage source into a plurality of lower voltages; - a voltage stabilizing circuit, provides a stable liquid crystal display driving voltage, and a soil parameter two parameter input interface, Input pulse width adjustment power output. - LCD driver, receive voltage divider circuit signal, and (4) Common point and node voltage output to form liquid crystal 'no light-emitting action; One Jing t first and count control circuit, control liquid crystal display It is enough to describe the relationship between the point and the node, the tenth, and the pulse wave adjustment control state; and the double adjustment control circuit to control the voltage input through the complex point and node. Power, when the voltage is stable, the pulse width adjustment circuit is turned off. .疋 即 2. 2. 2 Please pay attention to the power-saving liquid crystal display described in item j of the patent scope. Private, 禝 禝 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压 电压Han 77 pressure capacitor structure 4.:: Please enter the pulse of the power-saving liquid crystal number input interface mentioned in the scope of the patent scope: set:, force, use the check / square ^ 及 and the drive power of the integrated circuit - Table mode to determine the optimal pulse width adjustment power.曰 曰 ( 更 1 1 1 1 1 1 1 1 1 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 095 Adjusting power refers to the value of the small current that can drive the complex voltage divider circuit. 6. The power-saving liquid crystal display device according to claim 1, wherein the pulse width adjustment control circuit enables the voltage dividing circuit to be coupled to the voltage when the transition state is positive to the positive half cycle. The voltage dividing capacitor, the common point and the node are charged. After the common point and the node voltage are stabilized, the voltage is maintained by the voltage dividing capacitor and the halogen capacitor.