Temperature-Compensating Circuit for Field Sequential LCD
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Solution Overview
Problem
Field sequential liquid crystal display devices experience reduced display quality, particularly at lower temperatures, due to deteriorated switching elements and increased liquid crystal viscosity, leading to lower contrast ratios and color reproducibility.
Innovation Solution
A temperature-compensating circuit that includes a temperature-sensing unit and a DC/DC converting unit, which generates adjusted gate signals based on measured temperature, ensuring adequate pixel charging and maintaining display quality across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If field sequential color driving method is used to achieve high display quality, then color reproducibility and contrast ratio are improved, but at low temperatures the switching element performance deteriorates and liquid crystal viscosity increases, causing display quality to degrade
Solution Approach 1:
The patent applies parameter changes by adjusting the gate signal voltage level according to temperature conditions. A temperature sensing unit detects the temperature and generates a gate voltage converting signal that modifies the gate signal amplitude. At low temperatures, the gate signal voltage is increased to compensate for deteriorated switching element performance and high liquid crystal viscosity, thereby maintaining display quality across different temperature conditions.
2Reliability
If gate signal voltage is increased to compensate for low temperature effects, then switching element performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamics by making the gate signal voltage adjustable and temperature-dependent rather than fixed. The DC/DC converting unit dynamically adjusts the gate signal amplitude based on real-time temperature feedback from the temperature sensing unit. This dynamic adjustment ensures that the gate signal is only increased when necessary (at low temperatures), thereby maintaining switching element performance while minimizing unnecessary power consumption at normal temperatures.
Solution Approach 2:
The system changes the gate signal voltage parameter based on temperature conditions. The gate voltage converting signal adjusts the gate signal amplitude dynamically, increasing it only when temperature sensing indicates low temperature conditions that require compensation. This selective parameter adjustment maintains reliability when needed while avoiding increased power consumption during normal operating conditions.
3Manufacturing precision
If temperature sensing and gate signal conversion circuitry is added to compensate for temperature effects, then display quality at low temperatures is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the temperature sensing unit and DC/DC converting unit to serve multiple functions. The temperature sensing unit not only detects temperature but also generates the gate voltage converting signal. The DC/DC converting unit both converts the gate signal voltage level and regulates power delivery. This multi-functionality reduces the need for separate dedicated circuits, thereby limiting the increase in device complexity while achieving temperature compensation.
4Manufacturing precision
If sub-light sources are driven at high intensity to achieve full color display in field sequential mode, then color reproducibility is improved, but response time requirements for liquid crystal molecules become more stringent
Solution Approach 1:
The patent applies parameter changes by adjusting the gate signal voltage to optimize liquid crystal switching speed. At low temperatures where viscosity is high and response time is slow, the increased gate signal voltage accelerates the switching response of the liquid crystal molecules. This allows the system to maintain the required response times for field sequential color display even under adverse temperature conditions, thereby preserving color reproducibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves color reproducibility and contrast ratio at low temperatures, reducing power consumption and maintaining high display quality by compensating for temperature-induced reductions in gate signal effectiveness.
Implementation Method 1
a temperature-sensing unit that measures at least one of a temperature of the liquid crystal display device and a surrounding ambient temperature
Implementation Method 2
a DC/DC converting unit that generates a plurality of converted gate signals using the gate voltage-converting signal
Implementation Method 3
an LCD device is a non-emissive display device that displays images by controlling the transmittance of light from a backlight unit through a liquid crystal panel
Data Source
AI summary
A temperature-compensating circuit for a liquid crystal display device includes a temperature-sensing unit that measures the temperature of the liquid crystal display device and the surrounding ambient temperature. The temperature-sensing unit outputs a gate voltage-converting signal using the measured temperature. A DC/DC converting unit generates a plurality of converted gate signals using the gate voltage-converting signal. Absolute values of the plurality of converted gate signals are different from each other.