Liquid Crystal Display Temperature Control and Grayscale Transition
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Solution Overview
Problem
Liquid crystal displays face challenges in maintaining response speed and display quality due to temperature variations, as precise temperature control does not always prevent degradation, and existing solutions complicate the circuit arrangement with multiple look-up tables and temperature estimation circuits.
Innovation Solution
A liquid crystal display with a simple circuit arrangement that includes a memory for current pixel brightness data, a look-up table for facilitating grayscale level transitions, and a heater control system to maintain the panel temperature within ±3°C of a target range (33°C to 63°C), eliminating the need for complex temperature estimation and adjustment circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple look-up tables corresponding to respective temperatures are provided to properly facilitate grayscale level transition, then display quality is maintained across temperature ranges, but the circuit arrangement becomes complicated
Solution Approach 1:
A single look-up table is designed to store correction values for multiple temperature ranges. The table is structured with temperature range identification sections and corresponding correction value sections, allowing one table to serve multiple temperature conditions that would otherwise require separate tables.
Solution Approach 2:
The look-up table is divided into multiple temperature range sections (e.g., first temperature range, second temperature range), each with its own correction values. The system segments the temperature control by selecting appropriate sections based on current temperature, reducing the need for multiple complete tables.
2Reliability
If precise temperature control circuits are provided to maintain temperature within ±1°C, then display quality degradation is prevented, but the heater and temperature control circuit become complicated
Solution Approach 1:
The temperature control precision parameter is changed from ±1°C to ±3°C. This relaxation of the temperature control requirement simplifies the heater control circuit while still maintaining display quality through the temperature-compensated look-up table correction values.
3Reliability
If temperature control circuits with estimation circuits are provided to precisely control temperature, then display quality is maintained, but unnecessarily high temperature may occur due to mis-estimation
Solution Approach 1:
The system replaces complex estimation circuits with a simpler temperature detection and correction value selection mechanism. Instead of using sophisticated estimation algorithms that may misestimate, the system uses direct temperature detection and selects pre-calculated correction values from the look-up table, avoiding the problem of mis-estimation leading to excessive temperature.
4Speed
If grayscale level transition is facilitated by correcting image data, then response speed is improved, but excess brightness or poor brightness may occur when temperature is not appropriately controlled
Solution Approach 1:
The system implements feedback by detecting the current liquid crystal panel temperature and using this information to select appropriate correction values from the look-up table. This closed-loop approach ensures that the grayscale level transition facilitation is appropriately adjusted based on actual temperature conditions, preventing excess or poor brightness.
Solution Approach 2:
The correction values in the look-up table are specifically designed to change based on temperature parameters. At different temperature ranges, different correction values are applied to the image data, ensuring that grayscale level transition facilitation maintains appropriate brightness levels across varying temperatures.
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
This solution improves response speed while preventing degradation of display quality due to ambient temperature changes, maintaining target brightness within ±20% error, even with a single look-up table and reduced circuit complexity.
Implementation Method 1
a heater for causing the whole display panel to have a uniform temperature
Data Source
AI summary
A liquid crystal display of the present invention facilitates grayscale level transition from a previous frame to a current frame, in such a manner that a modulation driving process section reads out, from one look-up table, corrected image data corresponding to a combination of image data of a previous frame and image data of a current frame and then outputs this corrected image data, irrespective of the ambient temperature. Meanwhile, a temperature circuit controls a heater so as to either stop the heating by the heater when a temperature of the liquid crystal panel exceeds a threshold value which is 1° C. through 1.5° C. higher than a target temperature, or start the heating by the heater when the temperature of the liquid crystal panel goes below a threshold value which is 1° C. through 1.5° C. lower than the target temperature, the target temperature being determined in advance to be in a range between 48° C. and 63° C. In this manner, it is possible to realize a liquid crystal display which is simple in circuit arrangement but can improve a response speed while restraining the degradation of display quality to be hardly recognizable for the viewer.